Next: Handledningar för Scheme, Up: (dir) [Contents][Index]
Det här dokumentet presenterar handledningar och detaljerade exempel för GNU Guix, ett funktionellt pakethanteringsverktyg skrivet för GNU-systemet. Var god se see GNU Guix reference manual för fler detaljer om systemet, dess API samt relaterade begrepp.
Den här manualen är också tillgänglig på engelska (see GNU Guix Cookbook), franska (see Livre de recettes de GNU Guix), tysa (see GNU-Guix-Kochbuch), koreanska (see GNU Guix 쿡북), brasiliansk portugisiska (see Livro de receitas do GNU Guix) och slovakiska (see Receptár GNU Guix). Överväg att gå med Weblate (see Translating Guix in GNU Guix reference manual) om du vill översätta det här dokumentet till ditt modersmål.
Next: Paketering, Previous: Kokbok för GNU Guix, Up: Kokbok för GNU Guix [Contents][Index]
GNU Guix är skrivet i universalspråket Scheme och många av dess funktioner kan nås och manipuleras programmatiskt. Du kan använda Scheme för att generera paketdefinitioner, ändra dem, bygga dem, utveckla ett helt operativsystem med mera.
Att känna till grunderna i hur man programmerar i Scheme kommer att ge dig många av de avancerade funktionerna som Guix tilhandahåller — och du behöver inte vara en erfaren programmerare för att använda dem!
Låt oss börja!
Guix använder Guile-implementationen av Scheme. För att börja leka med
språket kan du installera det med guix install guile
och starta en
REPL—en förkortning av
read-eval-print loop—genom att köra guile
från
kommandoraden.
Alternativt kan du också köra guix shell guile -- guile
om du hellre
vill undvika att Guile installeras i din användarprofil.
In the following examples, lines show what you would type at the REPL; lines starting with “⇒” show evaluation results, while lines starting with “-|” show things that get printed. See Using Guile Interactively in GNU Guile Reference Manual, for more details on the REPL.
#true
and #false
(abbreviated #t
and #f
) stand
for the Booleans “true” and “false”, respectively.
Examples of valid expressions:
"Hello World!" ⇒ "Hello World!" 17 ⇒ 17 (display (string-append "Hello " "Guix" "\n")) -| Hello Guix! ⇒ #<unspecified>
lambda
term:
The above procedure returns the square of its argument. Since everything is
an expression, the lambda
expression returns an anonymous procedure,
which can in turn be applied to an argument:
((lambda (x) (* x x)) 3) ⇒ 9
Procedures are regular values just like numbers, strings, Booleans, and so on.
define
:
(define a 3) (define square (lambda (x) (* x x))) (square a) ⇒ 9
(define (square x) (* x x))
list
procedure:
(list 2 a 5 7) ⇒ (2 3 5 7)
(srfi srfi-1)
module to
create and process lists (see list processing in GNU Guile
Reference Manual). Here are some of the most useful ones in action:
(use-modules (srfi srfi-1)) ;import list processing procedures (append (list 1 2) (list 3 4)) ⇒ (1 2 3 4) (map (lambda (x) (* x x)) (list 1 2 3 4)) ⇒ (1 4 9 16) (delete 3 (list 1 2 3 4)) ⇒ (1 2 4) (filter odd? (list 1 2 3 4)) ⇒ (1 3) (remove even? (list 1 2 3 4)) ⇒ (1 3) (find number? (list "a" 42 "b")) ⇒ 42
Notice how the first argument to map
, filter
, remove
,
and find
is a procedure!
'(display (string-append "Hello " "Guix" "\n")) ⇒ (display (string-append "Hello " "Guix" "\n")) '(2 a 5 7) ⇒ (2 a 5 7)
quasiquote
(`
, a backquote) disables evaluation of a
parenthesized expression until unquote
(,
, a comma)
re-enables it. Thus it provides us with fine-grained control over what is
evaluated and what is not.
`(2 a 5 7 (2 ,a 5 ,(+ a 4))) ⇒ (2 a 5 7 (2 3 5 7))
Note that the above result is a list of mixed elements: numbers, symbols
(here a
) and the last element is a list itself.
quasiquote
and unquote
: #~
(or gexp
) and
#$
(or ungexp
). They let you stage code for later
execution.
For example, you’ll encounter gexps in some package definitions where they provide code to be executed during the package build process. They look like this:
(use-modules (guix gexp) ;so we can write gexps (gnu packages base)) ;for 'coreutils' ;; Below is a G-expression representing staged code. #~(begin ;; Invoke 'ls' from the package defined by the 'coreutils' ;; variable. (system* #$(file-append coreutils "/bin/ls") "-l") ;; Create this package's output directory. (mkdir #$output))
See G-Expressions in GNU Guix Reference Manual, for more on gexps.
let
(see Local
Bindings in GNU Guile Reference Manual):
(define x 10) (let ((x 2) (y 3)) (list x y)) ⇒ (2 3) x ⇒ 10 y error→ In procedure module-lookup: Unbound variable: y
Use let*
to allow later variable declarations to refer to earlier
definitions.
#:
(hash, colon) followed by
alphanumeric characters: #:like-this
. See Keywords in GNU
Guile Reference Manual.
%
is typically used for read-only global variables in
the build stage. Note that it is merely a convention, like _
in C.
Scheme treats %
exactly the same as any other letter.
define-module
(see Creating Guile
Modules in GNU Guile Reference Manual). For instance
(define-module (guix build-system ruby)
#:use-module (guix store)
#:export (ruby-build
ruby-build-system))
defines the module guix build-system ruby
which must be located in
guix/build-system/ruby.scm somewhere in the Guile load path. It
depends on the (guix store)
module and it exports two variables,
ruby-build
and ruby-build-system
.
See Package Modules in GNU Guix Reference Manual, for info on modules that define packages.
Going further: Scheme is a language that has been widely used to teach programming and you’ll find plenty of material using it as a vehicle. Here’s a selection of documents to learn more about Scheme:
- A Scheme Primer, by Christine Lemmer-Webber and the Spritely Institute.
- Scheme at a Glance, by Steve Litt.
- Structure and Interpretation of Computer Programs, by Harold Abelson and Gerald Jay Sussman, with Julie Sussman. Colloquially known as “SICP”, this book is a reference.
You can also install it and read it from your computer:
guix install sicp info-reader info sicpYou’ll find more books, tutorials and other resources at https://schemers.org/.
Next: Systemkonfiguration, Previous: Handledningar för Scheme, Up: Kokbok för GNU Guix [Contents][Index]
This chapter is dedicated to teaching you how to add packages to the collection of packages that come with GNU Guix. This involves writing package definitions in Guile Scheme, organizing them in package modules, and building them.
Up: Paketering [Contents][Index]
GNU Guix stands out as the hackable package manager, mostly because it uses GNU Guile, a powerful high-level programming language, one of the Scheme dialects from the Lisp family.
Package definitions are also written in Scheme, which empowers Guix in some very unique ways, unlike most other package managers that use shell scripts or simple languages.
#:make-flags "..."
argument to the list of packages. It wouldn’t be a stretch to think
Gentoo USE flags here, but
this goes even further: the changes don’t have to be thought out beforehand
by the packager, they can be programmed by the user!
The following tutorial covers all the basics around package creation with Guix. It does not assume much knowledge of the Guix system nor of the Lisp language. The reader is only expected to be familiar with the command line and to have some basic programming knowledge.
Next: Inställning, Up: Pakteringshandledning [Contents][Index]
The “Defining Packages” section of the manual introduces the basics of Guix packaging (see Defining Packages in GNU Guix Reference Manual). In the following section, we will partly go over those basics again.
GNU Hello is a dummy project that serves as an idiomatic example for
packaging. It uses the GNU build system (./configure && make && make
install
). Guix already provides a package definition which is a perfect
example to start with. You can look up its declaration with guix edit
hello
from the command line. Let’s see how it looks:
(define-public hello
(package
(name "hello")
(version "2.10")
(source (origin
(method url-fetch)
(uri (string-append "mirror://gnu/hello/hello-" version
".tar.gz"))
(sha256
(base32
"0ssi1wpaf7plaswqqjwigppsg5fyh99vdlb9kzl7c9lng89ndq1i"))))
(build-system gnu-build-system)
(synopsis "Hello, GNU world: An example GNU package")
(description
"GNU Hello prints the message \"Hello, world!\" and then exits. It
serves as an example of standard GNU coding practices. As such, it supports
command-line arguments, multiple languages, and so on.")
(home-page "https://www.gnu.org/software/hello/")
(license gpl3+)))
As you can see, most of it is rather straightforward. But let’s review the fields together:
The project name. Using Scheme conventions, we prefer to keep it lower case, without underscore and using dash-separated words.
Det här fältet innehåller en beskrivning av ursprunget till källkoden.
The origin
record contains these fields:
url-fetch
to download via HTTP/FTP, but other methods
exist, such as git-fetch
for Git repositories.
https://
location for url-fetch
. Here
the special ‘mirror://gnu‘ refers to a set of well known locations, all of
which can be used by Guix to fetch the source, should some of them fail.
sha256
checksum of the requested file. This is essential to ensure
the source is not corrupted. Note that Guix works with base32 strings,
hence the call to the base32
function.
This is where the power of abstraction provided by the Scheme language
really shines: in this case, the gnu-build-system
abstracts away the
famous ./configure && make && make install
shell invocations. Other
build systems include the trivial-build-system
which does not do
anything and requires from the packager to program all the build steps, the
python-build-system
, the emacs-build-system
, and many more
(see Build Systems in GNU Guix Reference Manual).
Det bör vara en koncis summering av vad paketet gör. För många paket kan en tagg från projektets webbsida användas som en summering.
Same as for the synopsis, it’s fine to re-use the project description from the homepage. Note that Guix uses Texinfo syntax.
Använd HTTPS om det går.
Se filen guix/licenses.scm
i projektkällan för en fullständig lista
över tillgängliga licenser.
Time to build our first package! Nothing fancy here for now: we will stick
to a dummy my-hello
, a copy of the above declaration.
As with the ritualistic “Hello World” taught with most programming languages, this will possibly be the most “manual” approach. We will work out an ideal setup later; for now we will go the simplest route.
Spara det följande till en fil my-hello.scm.
(use-modules (guix packages) (guix download) (guix build-system gnu) (guix licenses)) (package (name "my-hello") (version "2.10") (source (origin (method url-fetch) (uri (string-append "mirror://gnu/hello/hello-" version ".tar.gz")) (sha256 (base32 "0ssi1wpaf7plaswqqjwigppsg5fyh99vdlb9kzl7c9lng89ndq1i")))) (build-system gnu-build-system) (synopsis "Hello, Guix world: An example custom Guix package") (description "GNU Hello prints the message \"Hello, world!\" and then exits. It serves as an example of standard GNU coding practices. As such, it supports command-line arguments, multiple languages, and so on.") (home-page "https://www.gnu.org/software/hello/") (license gpl3+))
Vi kommer att förklara extrakoden om ett ögonblick.
Feel free to play with the different values of the various fields. If you change the source, you’ll need to update the checksum. Indeed, Guix refuses to build anything if the given checksum does not match the computed checksum of the source code. To obtain the correct checksum of the package declaration, we need to download the source, compute the sha256 checksum and convert it to base32.
Tacksamt nog kan Guix automatisera den här uppgiften för oss; allt vi behöver är att tillhandahålla URI-strängen:
$ guix download mirror://gnu/hello/hello-2.10.tar.gz Starting download of /tmp/guix-file.JLYgL7 From https://ftpmirror.gnu.org/gnu/hello/hello-2.10.tar.gz... following redirection to `https://mirror.ibcp.fr/pub/gnu/hello/hello-2.10.tar.gz'... …10.tar.gz 709KiB 2.5MiB/s 00:00 [##################] 100.0% /gnu/store/hbdalsf5lpf01x4dcknwx6xbn6n5km6k-hello-2.10.tar.gz 0ssi1wpaf7plaswqqjwigppsg5fyh99vdlb9kzl7c9lng89ndq1i
In this specific case the output tells us which mirror was chosen. If the
result of the above command is not the same as in the above snippet, update
your my-hello
declaration accordingly.
Note that GNU package tarballs come with an OpenPGP signature, so you should definitely check the signature of this tarball with ‘gpg‘ to authenticate it before going further:
$ guix download mirror://gnu/hello/hello-2.10.tar.gz.sig Starting download of /tmp/guix-file.03tFfb From https://ftpmirror.gnu.org/gnu/hello/hello-2.10.tar.gz.sig... following redirection to `https://ftp.igh.cnrs.fr/pub/gnu/hello/hello-2.10.tar.gz.sig'... ….tar.gz.sig 819B 1.2MiB/s 00:00 [##################] 100.0% /gnu/store/rzs8wba9ka7grrmgcpfyxvs58mly0sx6-hello-2.10.tar.gz.sig 0q0v86n3y38z17rl146gdakw9xc4mcscpk8dscs412j22glrv9jf $ gpg --verify /gnu/store/rzs8wba9ka7grrmgcpfyxvs58mly0sx6-hello-2.10.tar.gz.sig /gnu/store/hbdalsf5lpf01x4dcknwx6xbn6n5km6k-hello-2.10.tar.gz gpg: Signature made Sun 16 Nov 2014 01:08:37 PM CET gpg: using RSA key A9553245FDE9B739 gpg: Good signature from "Sami Kerola <kerolasa@iki.fi>" [unknown] gpg: aka "Sami Kerola (http://www.iki.fi/kerolasa/) <kerolasa@iki.fi>" [unknown] gpg: WARNING: This key is not certified with a trusted signature! gpg: There is no indication that the signature belongs to the owner. Primary key fingerprint: 8ED3 96E3 7E38 D471 A005 30D3 A955 3245 FDE9 B739
You can then happily run
$ guix package --install-from-file=my-hello.scm
You should now have my-hello
in your profile!
$ guix package --list-installed=my-hello my-hello 2.10 out /gnu/store/f1db2mfm8syb8qvc357c53slbvf1g9m9-my-hello-2.10
We’ve gone as far as we could without any knowledge of Scheme. Before moving on to more complex packages, now is the right time to brush up on your Scheme knowledge. See En snabbkurs i Scheme to get up to speed.
Next: Utökat exempel, Previous: Ett “Hello World” -paket, Up: Pakteringshandledning [Contents][Index]
In the rest of this chapter we will rely on some basic Scheme programming knowledge. Now let’s detail the different possible setups for working on Guix packages.
There are several ways to set up a Guix packaging environment.
We recommend you work directly on the Guix source checkout since it makes it easier for everyone to contribute to the project.
But first, let’s look at other possibilities.
Next: Kanaler, Up: Inställning [Contents][Index]
This is what we previously did with ‘my-hello’. With the Scheme basics
we’ve covered, we are now able to explain the leading chunks. As stated in
guix package --help
:
-f, --install-from-file=FIL installera paketet som koden inuti FIL utvärderas till
Thus the last expression must return a package, which is the case in our earlier example.
The use-modules
expression tells which of the modules we need in the
file. Modules are a collection of values and procedures. They are commonly
called “libraries” or “packages” in other programming languages.
Next: Direct checkout hacking, Previous: Lokal fil, Up: Inställning [Contents][Index]
Guix and its package collection can be extended through channels. A channel is a Git repository, public or not, containing .scm files that provide packages (see Defining Packages in GNU Guix Reference Manual) or services (see Defining Services in GNU Guix Reference Manual).
How would you go about creating a channel? First, create a directory that will contain your .scm files, say ~/my-channel:
mkdir ~/my-channel
Suppose you want to add the ‘my-hello’ package we saw previously; it first needs some adjustments:
(define-module (my-hello) #:use-module (guix licenses) #:use-module (guix packages) #:use-module (guix build-system gnu) #:use-module (guix download)) (define-public my-hello (package (name "my-hello") (version "2.10") (source (origin (method url-fetch) (uri (string-append "mirror://gnu/hello/hello-" version ".tar.gz")) (sha256 (base32 "0ssi1wpaf7plaswqqjwigppsg5fyh99vdlb9kzl7c9lng89ndq1i")))) (build-system gnu-build-system) (synopsis "Hello, Guix world: An example custom Guix package") (description "GNU Hello prints the message \"Hello, world!\" and then exits. It serves as an example of standard GNU coding practices. As such, it supports command-line arguments, multiple languages, and so on.") (home-page "https://www.gnu.org/software/hello/") (license gpl3+)))
Note that we have assigned the package value to an exported variable name
with define-public
. This is effectively assigning the package to the
my-hello
variable so that it can be referenced, among other as
dependency of other packages.
If you use guix package --install-from-file=my-hello.scm
on the above
file, it will fail because the last expression, define-public
, does
not return a package. If you want to use define-public
in this
use-case nonetheless, make sure the file ends with an evaluation of
my-hello
:
;; ... (define-public my-hello ;; ... ) my-hello
This last example is not very typical.
Now how do you make that package visible to guix
commands so you
can test your packages? You need to add the directory to the search path
using the -L command-line option, as in these examples:
guix show -L ~/my-channel my-hello guix build -L ~/my-channel my-hello
The final step is to turn ~/my-channel into an actual channel, making
your package collection seamlessly available via any guix
command. To do that, you first need to make it a Git repository:
cd ~/my-channel git init git add my-hello.scm git commit -m "First commit of my channel."
And that’s it, you have a channel! From there on, you can add this channel to your channel configuration in ~/.config/guix/channels.scm (see Specifying Additional Channels in GNU Guix Reference Manual); assuming you keep your channel local for now, the channels.scm would look something like this:
(append (list (channel
(name 'my-channel)
(url (string-append "file://" (getenv "HOME")
"/my-channel"))))
%default-channels)
Next time you run guix pull
, your channel will be picked up and
the packages it defines will be readily available to all the guix
commands, even if you do not pass -L. The guix describe
command will show that Guix is, indeed, using both the my-channel
and
the guix
channels.
See Creating a Channel in GNU Guix Reference Manual, for details.
Previous: Kanaler, Up: Inställning [Contents][Index]
Working directly on the Guix project is recommended: it reduces the friction when the time comes to submit your changes upstream to let the community benefit from your hard work!
Unlike most software distributions, the Guix repository holds in one place both the tooling (including the package manager) and the package definitions. This choice was made so that it would give developers the flexibility to modify the API without breakage by updating all packages at the same time. This reduces development inertia.
Check out the official Git repository:
$ git clone https://git.savannah.gnu.org/git/guix.git
In the rest of this article, we use ‘$GUIX_CHECKOUT’ to refer to the location of the checkout.
Follow the instructions in the manual (see Contributing in GNU Guix Reference Manual) to set up the repository environment.
Once ready, you should be able to use the package definitions from the repository environment.
Feel free to edit package definitions found in ‘$GUIX_CHECKOUT/gnu/packages’.
The ‘$GUIX_CHECKOUT/pre-inst-env’ script lets you use ‘guix’ over the package collection of the repository (see Running Guix Before It Is Installed in GNU Guix Reference Manual).
$ cd $GUIX_CHECKOUT $ ./pre-inst-env guix package --list-available=ruby ruby 1.8.7-p374 out gnu/packages/ruby.scm:119:2 ruby 2.1.6 out gnu/packages/ruby.scm:91:2 ruby 2.2.2 out gnu/packages/ruby.scm:39:2
$ ./pre-inst-env guix build --keep-failed ruby@2.1 /gnu/store/c13v73jxmj2nir2xjqaz5259zywsa9zi-ruby-2.1.6
$ ./pre-inst-env guix package --install ruby@2.1
$ ./pre-inst-env guix lint ruby@2.1
Guix strives at maintaining a high packaging standard; when contributing to the Guix project, remember to
Once you are happy with the result, you are welcome to send your contribution to make it part of Guix. This process is also detailed in the manual. (see Contributing in GNU Guix Reference Manual)
It’s a community effort so the more join in, the better Guix becomes!
Next: Andra byggsystem, Previous: Inställning, Up: Pakteringshandledning [Contents][Index]
The above “Hello World” example is as simple as it goes. Packages can be more complex than that and Guix can handle more advanced scenarios. Let’s look at another, more sophisticated package (slightly modified from the source):
(define-module (gnu packages version-control) #:use-module ((guix licenses) #:prefix license:) #:use-module (guix utils) #:use-module (guix packages) #:use-module (guix git-download) #:use-module (guix build-system cmake) #:use-module (gnu packages compression) #:use-module (gnu packages pkg-config) #:use-module (gnu packages python) #:use-module (gnu packages ssh) #:use-module (gnu packages tls) #:use-module (gnu packages web)) (define-public my-libgit2 (let ((commit "e98d0a37c93574d2c6107bf7f31140b548c6a7bf") (revision "1")) (package (name "my-libgit2") (version (git-version "0.26.6" revision commit)) (source (origin (method git-fetch) (uri (git-reference (url "https://github.com/libgit2/libgit2/") (commit commit))) (file-name (git-file-name name version)) (sha256 (base32 "17pjvprmdrx4h6bb1hhc98w9qi6ki7yl57f090n9kbhswxqfs7s3")) (patches (search-patches "libgit2-mtime-0.patch")) (modules '((guix build utils))) ;; Remove bundled software. (snippet '(delete-file-recursively "deps")))) (build-system cmake-build-system) (outputs '("out" "debug")) (arguments `(#:tests? #true ; Run the test suite (this is the default) #:configure-flags '("-DUSE_SHA1DC=ON") ; SHA-1 collision detection #:phases (modify-phases %standard-phases (add-after 'unpack 'fix-hardcoded-paths (lambda _ (substitute* "tests/repo/init.c" (("#!/bin/sh") (string-append "#!" (which "sh")))) (substitute* "tests/clar/fs.h" (("/bin/cp") (which "cp")) (("/bin/rm") (which "rm"))))) ;; Run checks more verbosely. (replace 'check (lambda* (#:key tests? #:allow-other-keys) (when tests? (invoke "./libgit2_clar" "-v" "-Q")))) (add-after 'unpack 'make-files-writable-for-tests (lambda _ (for-each make-file-writable (find-files "."))))))) (inputs (list libssh2 http-parser python-wrapper)) (native-inputs (list pkg-config)) (propagated-inputs ;; These two libraries are in 'Requires.private' in libgit2.pc. (list openssl zlib)) (home-page "https://libgit2.github.com/") (synopsis "Library providing Git core methods") (description "Libgit2 is a portable, pure C implementation of the Git core methods provided as a re-entrant linkable library with a solid API, allowing you to write native speed custom Git applications in any language with bindings.") ;; GPLv2 with linking exception (license license:gpl2))))
(In those cases were you only want to tweak a few fields from a package definition, you should rely on inheritance instead of copy-pasting everything. See below.)
Let’s discuss those fields in depth.
git-fetch
methodgit-fetch
methodUnlike the url-fetch
method, git-fetch
expects a
git-reference
which takes a Git repository and a commit. The commit
can be any Git reference such as tags, so if the version
is tagged,
then it can be used directly. Sometimes the tag is prefixed with a
v
, in which case you’d use (commit (string-append "v"
version))
.
To ensure that the source code from the Git repository is stored in a
directory with a descriptive name, we use (file-name (git-file-name
name version))
.
The git-version
procedure can be used to derive the version when
packaging programs for a specific commit, following the Guix contributor
guidelines (see Version Numbers in GNU Guix Reference Manual).
How does one obtain the sha256
hash that’s in there, you ask? By
invoking guix hash
on a checkout of the desired commit, along
these lines:
git clone https://github.com/libgit2/libgit2/ cd libgit2 git checkout v0.26.6 guix hash -rx .
guix hash -rx
computes a SHA256 hash over the whole directory,
excluding the .git sub-directory (see Invoking guix hash in GNU Guix Reference Manual).
In the future, guix download
will hopefully be able to do these
steps for you, just like it does for regular downloads.
Snippets are quoted (i.e. non-evaluated) Scheme code that are a means of patching the source. They are a Guix-y alternative to the traditional .patch files. Because of the quote, the code in only evaluated when passed to the Guix daemon for building. There can be as many snippets as needed.
Snippets might need additional Guile modules which can be imported from the
modules
field.
There are 3 different input types. In short:
Required for building but not runtime – installing a package through a substitute won’t install these inputs.
Installed in the store but not in the profile, as well as being present at build time.
Installed in the store and in the profile, as well as being present at build time.
See package Reference in GNU Guix Reference Manual for more details.
The distinction between the various inputs is important: if a dependency can be handled as an input instead of a propagated input, it should be done so, or else it “pollutes” the user profile for no good reason.
For instance, a user installing a graphical program that depends on a command line tool might only be interested in the graphical part, so there is no need to force the command line tool into the user profile. The dependency is a concern to the package, not to the user. Inputs make it possible to handle dependencies without bugging the user by adding undesired executable files (or libraries) to their profile.
Same goes for native-inputs: once the program is installed, build-time dependencies can be safely garbage-collected. It also matters when a substitute is available, in which case only the inputs and propagated inputs will be fetched: the native inputs are not required to install a package from a substitute.
Observera: You may see here and there snippets where package inputs are written quite differently, like so:
;; The "old style" for inputs. (inputs `(("libssh2" ,libssh2) ("http-parser" ,http-parser) ("python" ,python-wrapper)))This is the “old style”, where each input in the list is explicitly given a label (a string). It is still supported but we recommend using the style above instead. See package Reference in GNU Guix Reference Manual, for more info.
Precis som ett paket kan ha flera indata kan det också producera flera utdata.
Each output corresponds to a separate directory in the store.
The user can choose which output to install; this is useful to save space or to avoid polluting the user profile with unwanted executables or libraries.
Output separation is optional. When the outputs
field is left out,
the default and only output (the complete package) is referred to as
"out"
.
Typical separate output names include debug
and doc
.
It’s advised to separate outputs only when you’ve shown it’s worth it: if
the output size is significant (compare with guix size
) or in case
the package is modular.
The arguments
is a keyword-value list used to configure the build
process.
The simplest argument #:tests?
can be used to disable the test suite
when building the package. This is mostly useful when the package does not
feature any test suite. It’s strongly recommended to keep the test suite on
if there is one.
Another common argument is :make-flags
, which specifies a list of
flags to append when running make, as you would from the command line. For
instance, the following flags
#:make-flags (list (string-append "prefix=" (assoc-ref %outputs "out")) "CC=gcc")
translate into
$ make CC=gcc prefix=/gnu/store/...-<out>
This sets the C compiler to gcc
and the prefix
variable (the
installation directory in Make parlance) to (assoc-ref %outputs
"out")
, which is a build-stage global variable pointing to the destination
directory in the store (something like
/gnu/store/...-my-libgit2-20180408).
Similarly, it’s possible to set the configure flags:
#:configure-flags '("-DUSE_SHA1DC=ON")
The %build-inputs
variable is also generated in scope. It’s an
association table that maps the input names to their store directories.
The phases
keyword lists the sequential steps of the build system.
Typically phases include unpack
, configure
, build
,
install
and check
. To know more about those phases, you need
to work out the appropriate build system definition in
‘$GUIX_CHECKOUT/guix/build/gnu-build-system.scm’:
(define %standard-phases
;; Standard build phases, as a list of symbol/procedure pairs.
(let-syntax ((phases (syntax-rules ()
((_ p ...) `((p . ,p) ...)))))
(phases set-SOURCE-DATE-EPOCH set-paths install-locale unpack
bootstrap
patch-usr-bin-file
patch-source-shebangs configure patch-generated-file-shebangs
build check install
patch-shebangs strip
validate-runpath
validate-documentation-location
delete-info-dir-file
patch-dot-desktop-files
install-license-files
reset-gzip-timestamps
compress-documentation)))
Or from the REPL:
(add-to-load-path "/path/to/guix/checkout") ,use (guix build gnu-build-system) (map first %standard-phases) ⇒ (set-SOURCE-DATE-EPOCH set-paths install-locale unpack bootstrap patch-usr-bin-file patch-source-shebangs configure patch-generated-file-shebangs build check install patch-shebangs strip validate-runpath validate-documentation-location delete-info-dir-file patch-dot-desktop-files install-license-files reset-gzip-timestamps compress-documentation)
If you want to know more about what happens during those phases, consult the associated procedures.
For instance, as of this writing the definition of unpack
for the GNU
build system is:
(define* (unpack #:key source #:allow-other-keys)
"Unpack SOURCE in the working directory, and change directory within the
source. When SOURCE is a directory, copy it in a sub-directory of the current
working directory."
(if (file-is-directory? source)
(begin
(mkdir "source")
(chdir "source")
;; Preserve timestamps (set to the Epoch) on the copied tree so that
;; things work deterministically.
(copy-recursively source "."
#:keep-mtime? #true))
(begin
(if (string-suffix? ".zip" source)
(invoke "unzip" source)
(invoke "tar" "xvf" source))
(chdir (first-subdirectory "."))))
#true)
Note the chdir
call: it changes the working directory to where the
source was unpacked. Thus every phase following the unpack
will use
the source as a working directory, which is why we can directly work on the
source files. That is to say, unless a later phase changes the working
directory to something else.
We modify the list of %standard-phases
of the build system with the
modify-phases
macro as per the list of specified modifications, which
may have the following forms:
(add-before phase new-phase procedure)
: Run
procedure named new-phase before phase.
(add-after phase new-phase procedure)
: Same, but
afterwards.
(replace phase procedure)
.
(delete phase)
.
The procedure supports the keyword arguments inputs
and
outputs
. Each input (whether native, propagated or
not) and output directory is referenced by their name in those variables.
Thus (assoc-ref outputs "out")
is the store directory of the main
output of the package. A phase procedure may look like this:
(lambda* (#:key inputs outputs #:allow-other-keys)
(let ((bash-directory (assoc-ref inputs "bash"))
(output-directory (assoc-ref outputs "out"))
(doc-directory (assoc-ref outputs "doc")))
;; ...
#true))
The procedure must return #true
on success. It’s brittle to rely on
the return value of the last expression used to tweak the phase because
there is no guarantee it would be a #true
. Hence the trailing
#true
to ensure the right value is returned on success.
The astute reader may have noticed the quasi-quote and comma syntax in the argument field. Indeed, the build code in the package declaration should not be evaluated on the client side, but only when passed to the Guix daemon. This mechanism of passing code around two running processes is called code staging.
When customizing phases
, we often need to write code that mimics the
equivalent system invocations (make
, mkdir
, cp
, etc.)
commonly used during regular “Unix-style” installations.
Some like chmod
are native to Guile. See Guile
reference manual for a complete list.
Guix provides additional helper functions which prove especially handy in the context of package management.
Some of those functions can be found in ‘$GUIX_CHECKOUT/guix/guix/build/utils.scm’. Most of them mirror the behaviour of the traditional Unix system commands:
which
Like the ‘which’ system command.
find-files
Akin to the ‘find’ system command.
mkdir-p
Like ‘mkdir -p’, which creates all parents as needed.
install-file
Similar to ‘install’ when installing a file to a (possibly
non-existing) directory. Guile has copy-file
which works like
‘cp’.
copy-recursively
Like ‘cp -r’.
delete-file-recursively
Like ‘rm -rf’.
invoke
Run an executable. This should be used instead of system*
.
with-directory-excursion
Run the body in a different working directory, then restore the previous working directory.
substitute*
A “sed
-like” function.
See Build Utilities in GNU Guix Reference Manual, for more information on these utilities.
The license in our last example needs a prefix: this is because of how the
license
module was imported in the package, as #:use-module
((guix licenses) #:prefix license:)
. The Guile module import mechanism
(see Using Guile Modules in Guile reference manual) gives the
user full control over namespacing: this is needed to avoid clashes between,
say, the ‘zlib’ variable from ‘licenses.scm’ (a license
value) and the ‘zlib’ variable from ‘compression.scm’ (a
package value).
Next: Programmeringsbar och automatiserad paketdefinition, Previous: Utökat exempel, Up: Pakteringshandledning [Contents][Index]
What we’ve seen so far covers the majority of packages using a build system
other than the trivial-build-system
. The latter does not automate
anything and leaves you to build everything manually. This can be more
demanding and we won’t cover it here for now, but thankfully it is rarely
necessary to fall back on this system.
For the other build systems, such as ASDF, Emacs, Perl, Ruby and many more, the process is very similar to the GNU build system except for a few specialized arguments.
See Build Systems in GNU Guix Reference Manual, for more information on build systems, or check the source code in the ‘$GUIX_CHECKOUT/guix/build’ and ‘$GUIX_CHECKOUT/guix/build-system’ directories.
Next: Få hjälp, Previous: Andra byggsystem, Up: Pakteringshandledning [Contents][Index]
We can’t repeat it enough: having a full-fledged programming language at hand empowers us in ways that reach far beyond traditional package management.
Let’s illustrate this with some awesome features of Guix!
Next: Automatisk uppdatering, Up: Programmeringsbar och automatiserad paketdefinition [Contents][Index]
You might find some build systems good enough that there is little to do at all to write a package, to the point that it becomes repetitive and tedious after a while. A raison d’être of computers is to replace human beings at those boring tasks. So let’s tell Guix to do this for us and create the package definition of an R package from CRAN (the output is trimmed for conciseness):
$ guix import cran --recursive walrus (define-public r-mc2d ; ... (license gpl2+))) (define-public r-jmvcore ; ... (license gpl2+))) (define-public r-wrs2 ; ... (license gpl3))) (define-public r-walrus (package (name "r-walrus") (version "1.0.3") (source (origin (method url-fetch) (uri (cran-uri "walrus" version)) (sha256 (base32 "1nk2glcvy4hyksl5ipq2mz8jy4fss90hx6cq98m3w96kzjni6jjj")))) (build-system r-build-system) (propagated-inputs (list r-ggplot2 r-jmvcore r-r6 r-wrs2)) (home-page "https://github.com/jamovi/walrus") (synopsis "Robust Statistical Methods") (description "This package provides a toolbox of common robust statistical tests, including robust descriptives, robust t-tests, and robust ANOVA. It is also available as a module for 'jamovi' (see <https://www.jamovi.org> for more information). Walrus is based on the WRS2 package by Patrick Mair, which is in turn based on the scripts and work of Rand Wilcox. These analyses are described in depth in the book 'Introduction to Robust Estimation & Hypothesis Testing'.") (license gpl3)))
The recursive importer won’t import packages for which Guix already has package definitions, except for the very first.
Not all applications can be packaged this way, only those relying on a select number of supported systems. Read about the full list of importers in the guix import section of the manual (see Invoking guix import in GNU Guix Reference Manual).
Next: Inheritance, Previous: Recursive importers, Up: Programmeringsbar och automatiserad paketdefinition [Contents][Index]
Guix can be smart enough to check for updates on systems it knows. It can report outdated package definitions with
$ guix refresh hello
In most cases, updating a package to a newer version requires little more than changing the version number and the checksum. Guix can do that automatically as well:
$ guix refresh hello --update
Previous: Automatisk uppdatering, Up: Programmeringsbar och automatiserad paketdefinition [Contents][Index]
If you’ve started browsing the existing package definitions, you might have
noticed that a significant number of them have a inherit
field:
(define-public adwaita-icon-theme
(package (inherit gnome-icon-theme)
(name "adwaita-icon-theme")
(version "3.26.1")
(source (origin
(method url-fetch)
(uri (string-append "mirror://gnome/sources/" name "/"
(version-major+minor version) "/"
name "-" version ".tar.xz"))
(sha256
(base32
"17fpahgh5dyckgz7rwqvzgnhx53cx9kr2xw0szprc6bnqy977fi8"))))
(native-inputs (list `(,gtk+ "bin")))))
All unspecified fields are inherited from the parent package. This is very convenient to create alternative packages, for instance with different source, version or compilation options.
Next: Slutsats, Previous: Programmeringsbar och automatiserad paketdefinition, Up: Pakteringshandledning [Contents][Index]
Sadly, some applications can be tough to package. Sometimes they need a patch to work with the non-standard file system hierarchy enforced by the store. Sometimes the tests won’t run properly. (They can be skipped but this is not recommended.) Other times the resulting package won’t be reproducible.
Should you be stuck, unable to figure out how to fix any sort of packaging issue, don’t hesitate to ask the community for help.
See the Guix homepage for information on the mailing lists, IRC, etc.
Next: Referenser, Previous: Få hjälp, Up: Pakteringshandledning [Contents][Index]
This tutorial was a showcase of the sophisticated package management that
Guix boasts. At this point we have mostly restricted this introduction to
the gnu-build-system
which is a core abstraction layer on which more
advanced abstractions are based.
Where do we go from here? Next we ought to dissect the innards of the build
system by removing all abstractions, using the trivial-build-system
:
this should give us a thorough understanding of the process before
investigating some more advanced packaging techniques and edge cases.
Other features worth exploring are the interactive editing and debugging capabilities of Guix provided by the Guile REPL.
Those fancy features are completely optional and can wait; now is a good time to take a well-deserved break. With what we’ve introduced here you should be well armed to package lots of programs. You can get started right away and hopefully we will see your contributions soon!
Previous: Slutsats, Up: Pakteringshandledning [Contents][Index]
Next: Behållare, Previous: Paketering, Up: Kokbok för GNU Guix [Contents][Index]
Guix erbjuder ett flexibelt språk för att deklarativt konfigurera ditt Guix Syste. Den här flexibiliteten kan ibland vara överväldigande. Syftet med det här kapitlet är att demonstrera några avancerade konfigurationsbegrepp.
see System Configuration in GNU Guix Reference Manual for a complete reference.
Next: Att anpassa kärnan, Up: Systemkonfiguration [Contents][Index]
While the Guix manual explains auto-login one user to all TTYs
(see auto-login to TTY in GNU Guix Reference Manual), some might
prefer a situation, in which one user is logged into one TTY with the other
TTYs either configured to login different users or no one at all. Note that
one can auto-login one user to any TTY, but it is usually advisable to avoid
tty1
, which, by default, is used to log warnings and errors.
Here is how one might set up auto login for one user to one tty:
(define (auto-login-to-tty config tty user) (if (string=? tty (mingetty-configuration-tty config)) (mingetty-configuration (inherit config) (auto-login user)) config)) (define %my-services (modify-services %base-services ;; … (mingetty-service-type config => (auto-login-to-tty config "tty3" "alice")))) (operating-system ;; … (services %my-services))
One could also compose
(see Higher-Order Functions in The
Guile Reference Manual) auto-login-to-tty
to login multiple users to
multiple ttys.
Finally, here is a note of caution. Setting up auto login to a TTY, means that anyone can turn on your computer and run commands as your regular user. However, if you have an encrypted root partition, and thus already need to enter a passphrase when the system boots, auto-login might be a convenient option.
Next: Guix System Image API, Previous: Auto-Login to a Specific TTY, Up: Systemkonfiguration [Contents][Index]
Guix is, at its core, a source based distribution with substitutes (see Substitutes in GNU Guix Reference Manual), and as such building packages from their source code is an expected part of regular package installations and upgrades. Given this starting point, it makes sense that efforts are made to reduce the amount of time spent compiling packages, and recent changes and upgrades to the building and distribution of substitutes continues to be a topic of discussion within Guix.
The kernel, while not requiring an overabundance of RAM to build, does take a rather long time on an average machine. The official kernel configuration, as is the case with many GNU/Linux distributions, errs on the side of inclusiveness, and this is really what causes the build to take such a long time when the kernel is built from source.
The Linux kernel, however, can also just be described as a regular old package, and as such can be customized just like any other package. The procedure is a little bit different, although this is primarily due to the nature of how the package definition is written.
The linux-libre
kernel package definition is actually a procedure
which creates a package.
(define* (make-linux-libre* version gnu-revision source supported-systems
#:key
(extra-version #f)
;; A function that takes an arch and a variant.
;; See kernel-config for an example.
(configuration-file #f)
(defconfig "defconfig")
(extra-options (default-extra-linux-options version)))
...)
The current linux-libre
package is for the 5.15.x series, and is
declared like this:
(define-public linux-libre-5.15
(make-linux-libre* linux-libre-5.15-version
linux-libre-5.15-gnu-revision
linux-libre-5.15-source
'("x86_64-linux" "i686-linux" "armhf-linux"
"aarch64-linux" "riscv64-linux")
#:configuration-file kernel-config))
Any keys which are not assigned values inherit their default value from the
make-linux-libre
definition. When comparing the two snippets above,
notice the code comment that refers to #:configuration-file
. Because
of this, it is not actually easy to include a custom kernel configuration
from the definition, but don’t worry, there are other ways to work with what
we do have.
There are two ways to create a kernel with a custom kernel configuration.
The first is to provide a standard .config file during the build
process by including an actual .config file as a native input to our
custom kernel. The following is a snippet from the custom 'configure
phase of the make-linux-libre
package definition:
(let ((build (assoc-ref %standard-phases 'build))
(config (assoc-ref (or native-inputs inputs) "kconfig")))
;; Use a custom kernel configuration file or a default
;; configuration file.
(if config
(begin
(copy-file config ".config")
(chmod ".config" #o666))
(invoke "make" ,defconfig)))
Below is a sample kernel package. The linux-libre
package is nothing
special and can be inherited from and have its fields overridden like any
other package:
(define-public linux-libre/E2140
(package
(inherit linux-libre)
(native-inputs
`(("kconfig" ,(local-file "E2140.config"))
,@(alist-delete "kconfig"
(package-native-inputs linux-libre))))))
In the same directory as the file defining linux-libre-E2140
is a
file named E2140.config, which is an actual kernel configuration
file. The defconfig
keyword of make-linux-libre
is left blank
here, so the only kernel configuration in the package is the one which was
included in the native-inputs
field.
The second way to create a custom kernel is to pass a new value to the
extra-options
keyword of the make-linux-libre
procedure. The
extra-options
keyword works with another function defined right below
it:
(define (default-extra-linux-options version) `(;; https://lists.gnu.org/archive/html/guix-devel/2014-04/msg00039.html ("CONFIG_DEVPTS_MULTIPLE_INSTANCES" . #true) ;; Modules required for initrd: ("CONFIG_NET_9P" . m) ("CONFIG_NET_9P_VIRTIO" . m) ("CONFIG_VIRTIO_BLK" . m) ("CONFIG_VIRTIO_NET" . m) ("CONFIG_VIRTIO_PCI" . m) ("CONFIG_VIRTIO_BALLOON" . m) ("CONFIG_VIRTIO_MMIO" . m) ("CONFIG_FUSE_FS" . m) ("CONFIG_CIFS" . m) ("CONFIG_9P_FS" . m))) (define (config->string options) (string-join (map (match-lambda ((option . 'm) (string-append option "=m")) ((option . #true) (string-append option "=y")) ((option . #false) (string-append option "=n"))) options) "\n"))
And in the custom configure script from the ‘make-linux-libre‘ package:
;; Appending works even when the option wasn't in the ;; file. The last one prevails if duplicated. (let ((port (open-file ".config" "a")) (extra-configuration ,(config->string extra-options))) (display extra-configuration port) (close-port port)) (invoke "make" "oldconfig")
So by not providing a configuration-file the .config starts blank, and then we write into it the collection of flags that we want. Here’s another custom kernel:
(define %macbook41-full-config (append %macbook41-config-options %file-systems %efi-support %emulation ((@@ (gnu packages linux) default-extra-linux-options) version))) (define-public linux-libre-macbook41 ;; XXX: Access the internal 'make-linux-libre*' procedure, which is ;; private and unexported, and is liable to change in the future. ((@@ (gnu packages linux) make-linux-libre*) (@@ (gnu packages linux) linux-libre-version) (@@ (gnu packages linux) linux-libre-gnu-revision) (@@ (gnu packages linux) linux-libre-source) '("x86_64-linux") #:extra-version "macbook41" #:extra-options %macbook41-config-options))
In the above example %file-systems
is a collection of flags enabling
different file system support, %efi-support
enables EFI support and
%emulation
enables a x86_64-linux machine to act in 32-bit mode
also. The default-extra-linux-options
procedure is the one defined
above, which had to be used to avoid loosing the default configuration
options of the extra-options
keyword.
This all sounds like it should be doable, but how does one even know which
modules are required for a particular system? Two places that can be helpful
in trying to answer this question is the
Gentoo Handbook and the
documentation from the kernel itself. From the kernel documentation, it
seems that make localmodconfig
is the command we want.
In order to actually run make localmodconfig
we first need to get and
unpack the kernel source code:
tar xf $(guix build linux-libre --source)
Once inside the directory containing the source code run touch
.config
to create an initial, empty .config to start with.
make localmodconfig
works by seeing what you already have in
.config and letting you know what you’re missing. If the file is
blank then you’re missing everything. The next step is to run:
guix shell -D linux-libre -- make localmodconfig
and note the output. Do note that the .config file is still empty. The output generally contains two types of warnings. The first start with "WARNING" and can actually be ignored in our case. The second read:
module pcspkr did not have configs CONFIG_INPUT_PCSPKR
For each of these lines, copy the CONFIG_XXXX_XXXX
portion into the
.config in the directory, and append =m
, so in the end it
looks like this:
CONFIG_INPUT_PCSPKR=m CONFIG_VIRTIO=m
After copying all the configuration options, run make localmodconfig
again to make sure that you don’t have any output starting with “module”.
After all of these machine specific modules there are a couple more left
that are also needed. CONFIG_MODULES
is necessary so that you can
build and load modules separately and not have everything built into the
kernel. CONFIG_BLK_DEV_SD
is required for reading from hard drives.
It is possible that there are other modules which you will need.
This post does not aim to be a guide to configuring your own kernel however, so if you do decide to build a custom kernel you’ll have to seek out other guides to create a kernel which is just right for your needs.
The second way to setup the kernel configuration makes more use of Guix’s features and allows you to share configuration segments between different kernels. For example, all machines using EFI to boot have a number of EFI configuration flags that they need. It is likely that all the kernels will share a list of file systems to support. By using variables it is easier to see at a glance what features are enabled and to make sure you don’t have features in one kernel but missing in another.
Left undiscussed however, is Guix’s initrd and its customization. It is likely that you’ll need to modify the initrd on a machine using a custom kernel, since certain modules which are expected to be built may not be available for inclusion into the initrd.
Next: Att använda säkerhetsnycklar, Previous: Att anpassa kärnan, Up: Systemkonfiguration [Contents][Index]
Historically, Guix System is centered around an operating-system
structure. This structure contains various fields ranging from the
bootloader and kernel declaration to the services to install.
Depending on the target machine, that can go from a standard x86_64
machine to a small ARM single board computer such as the Pine64, the image
constraints can vary a lot. The hardware manufacturers will impose
different image formats with various partition sizes and offsets.
To create images suitable for all those machines, a new abstraction is
necessary: that’s the goal of the image
record. This record contains
all the required information to be transformed into a standalone image, that
can be directly booted on any target machine.
(define-record-type* <image>
image make-image
image?
(name image-name ;symbol
(default #f))
(format image-format) ;symbol
(target image-target
(default #f))
(size image-size ;size in bytes as integer
(default 'guess))
(operating-system image-operating-system ;<operating-system>
(default #f))
(partitions image-partitions ;list of <partition>
(default '()))
(compression? image-compression? ;boolean
(default #t))
(volatile-root? image-volatile-root? ;boolean
(default #t))
(substitutable? image-substitutable? ;boolean
(default #t)))
This record contains the operating-system to instantiate. The format
field defines the image type and can be efi-raw
, qcow2
or
iso9660
for instance. In the future, it could be extended to
docker
or other image types.
A new directory in the Guix sources is dedicated to images definition. For now there are four files:
Let’s have a look to pine64.scm. It contains the
pine64-barebones-os
variable which is a minimal definition of an
operating-system dedicated to the Pine A64 LTS board.
(define pine64-barebones-os
(operating-system
(host-name "vignemale")
(timezone "Europe/Paris")
(locale "en_US.utf8")
(bootloader (bootloader-configuration
(bootloader u-boot-pine64-lts-bootloader)
(targets '("/dev/vda"))))
(initrd-modules '())
(kernel linux-libre-arm64-generic)
(file-systems (cons (file-system
(device (file-system-label "my-root"))
(mount-point "/")
(type "ext4"))
%base-file-systems))
(services (cons (service agetty-service-type
(agetty-configuration
(extra-options '("-L")) ; no carrier detect
(baud-rate "115200")
(term "vt100")
(tty "ttyS0")))
%base-services))))
The kernel
and bootloader
fields are pointing to packages
dedicated to this board.
Right below, the pine64-image-type
variable is also defined.
(define pine64-image-type
(image-type
(name 'pine64-raw)
(constructor (cut image-with-os arm64-disk-image <>))))
It’s using a record we haven’t talked about yet, the image-type
record, defined this way:
(define-record-type* <image-type> image-type make-image-type image-type? (name image-type-name) ;symbol (constructor image-type-constructor)) ;<operating-system> -> <image>
The main purpose of this record is to associate a name to a procedure
transforming an operating-system
to an image. To understand why it
is necessary, let’s have a look to the command producing an image from an
operating-system
configuration file:
guix system image my-os.scm
This command expects an operating-system
configuration but how should
we indicate that we want an image targeting a Pine64 board? We need to
provide an extra information, the image-type
, by passing the
--image-type
or -t
flag, this way:
guix system image --image-type=pine64-raw my-os.scm
This image-type
parameter points to the pine64-image-type
defined above. Hence, the operating-system
declared in
my-os.scm
will be applied the (cut image-with-os
arm64-disk-image <>)
procedure to turn it into an image.
The resulting image looks like:
(image
(format 'disk-image)
(target "aarch64-linux-gnu")
(operating-system my-os)
(partitions
(list (partition
(inherit root-partition)
(offset root-offset)))))
which is the aggregation of the operating-system
defined in
my-os.scm
to the arm64-disk-image
record.
But enough Scheme madness. What does this image API bring to the Guix user?
One can run:
mathieu@cervin:~$ guix system --list-image-types The available image types are: - unmatched-raw - rock64-raw - pinebook-pro-raw - pine64-raw - novena-raw - hurd-raw - hurd-qcow2 - qcow2 - iso9660 - uncompressed-iso9660 - tarball - efi-raw - mbr-raw - docker - wsl2 - raw-with-offset - efi32-raw
and by writing an operating-system
file based on
pine64-barebones-os
, you can customize your image to your preferences
in a file (my-pine-os.scm) like this:
(use-modules (gnu services linux) (gnu system images pine64)) (let ((base-os pine64-barebones-os)) (operating-system (inherit base-os) (timezone "America/Indiana/Indianapolis") (services (cons (service earlyoom-service-type (earlyoom-configuration (prefer-regexp "icecat|chromium"))) (operating-system-user-services base-os)))))
run:
guix system image --image-type=pine64-raw my-pine-os.scm
or,
guix system image --image-type=hurd-raw my-hurd-os.scm
to get an image that can be written directly to a hard drive and booted from.
Without changing anything to my-hurd-os.scm
, calling:
guix system image --image-type=hurd-qcow2 my-hurd-os.scm
will instead produce a Hurd QEMU image.
Next: Dynamic DNS mcron job, Previous: Guix System Image API, Up: Systemkonfiguration [Contents][Index]
The use of security keys can improve your security by providing a second authentication source that cannot be easily stolen or copied, at least for a remote adversary (something that you have), to the main secret (a passphrase – something that you know), reducing the risk of impersonation.
The example configuration detailed below showcases what minimal configuration needs to be made on your Guix System to allow the use of a Yubico security key. It is hoped the configuration can be useful for other security keys as well, with minor adjustments.
To be usable, the udev rules of the system should be extended with
key-specific rules. The following shows how to extend your udev rules with
the lib/udev/rules.d/70-u2f.rules udev rule file provided by the
libfido2
package from the (gnu packages security-token)
module
and add your user to the ‘"plugdev"’ group it uses:
(use-package-modules ... security-token ...) ... (operating-system ... (users (cons* (user-account (name "your-user") (group "users") (supplementary-groups '("wheel" "netdev" "audio" "video" "plugdev")) ;<- added system group (home-directory "/home/your-user")) %base-user-accounts)) ... (services (cons* ... (udev-rules-service 'fido2 libfido2 #:groups '("plugdev")))))
After re-configuring your system and re-logging in your graphical session so that the new group is in effect for your user, you can verify that your key is usable by launching:
guix shell ungoogled-chromium -- chromium chrome://settings/securityKeys
and validating that the security key can be reset via the “Reset your security key” menu. If it works, congratulations, your security key is ready to be used with applications supporting two-factor authentication (2FA).
If you use a Yubikey security key and are irritated by the spurious OTP
codes it generates when inadvertently touching the key (e.g. causing you to
become a spammer in the ‘#guix’ channel when discussing from your
favorite IRC client!), you can disable it via the following ykman
command:
guix shell python-yubikey-manager -- ykman config usb --force --disable OTP
Alternatively, you could use the ykman-gui
command provided by the
yubikey-manager-qt
package and either wholly disable the ‘OTP’
application for the USB interface or, from the ‘Applications -> OTP’
view, delete the slot 1 configuration, which comes pre-configured with the
Yubico OTP application.
The KeePassXC password manager application has support for Yubikeys, but it requires installing a udev rules for your Guix System and some configuration of the Yubico OTP application on the key.
The necessary udev rules file comes from the yubikey-personalization
package, and can be installed like:
(use-package-modules ... security-token ...) ... (operating-system ... (services (cons* ... (udev-rules-service 'yubikey yubikey-personalization))))
After reconfiguring your system (and reconnecting your Yubikey), you’ll then want to configure the OTP challenge/response application of your Yubikey on its slot 2, which is what KeePassXC uses. It’s easy to do so via the Yubikey Manager graphical configuration tool, which can be invoked with:
guix shell yubikey-manager-qt -- ykman-gui
First, ensure ‘OTP’ is enabled under the ‘Interfaces’ tab, then navigate to ‘Applications -> OTP’, and click the ‘Configure’ button under the ‘Long Touch (Slot 2)’ section. Select ‘Challenge-response’, input or generate a secret key, and click the ‘Finish’ button. If you have a second Yubikey you’d like to use as a backup, you should configure it the same way, using the same secret key.
Your Yubikey should now be detected by KeePassXC. It can be added to a database by navigating to KeePassXC’s ‘Database -> Database Security...’ menu, then clicking the ‘Add additional protection...’ button, then ‘Add Challenge-Response’, selecting the security key from the drop-down menu and clicking the ‘OK’ button to complete the setup.
Next: Att ansluta till Wireguard VPN, Previous: Att använda säkerhetsnycklar, Up: Systemkonfiguration [Contents][Index]
If your ISP (Internet Service Provider) only provides dynamic IP addresses, it can be useful to setup a dynamic DNS (Domain Name System) (also known as DDNS (Dynamic DNS)) service to associate a static host name to a public but dynamic (often changing) IP address. There are multiple existing services that can be used for this; in the following mcron job, DuckDNS is used. It should also work with other dynamic DNS services that offer a similar interface to update the IP address, such as https://freedns.afraid.org/, with minor adjustments.
The mcron job is provided below, where DOMAIN should be substituted for your own domain prefix, and the DuckDNS provided token associated to DOMAIN added to the /etc/duckdns/DOMAIN.token file.
(define duckdns-job
;; Update personal domain IP every 5 minutes.
#~(job '(next-minute (range 0 60 5))
#$(program-file
"duckdns-update"
(with-extensions (list guile-gnutls) ;required by (web client)
#~(begin
(use-modules (ice-9 textual-ports)
(web client))
(let ((token (string-trim-both
(call-with-input-file "/etc/duckdns/DOMAIN.token"
get-string-all)))
(query-template (string-append "https://www.duckdns.org/"
"update?domains=DOMAIN"
"&token=~a&ip=")))
(http-get (format #f query-template token))))))
"duckdns-update"
#:user "nobody"))
The job then needs to be added to the list of mcron jobs for your system, using something like:
(operating-system
(services
(cons* (service mcron-service-type
(mcron-configuration
(jobs (list duckdns-job ...))))
...
%base-services)))
Next: Att anpassa en fönsterhanterare, Previous: Dynamic DNS mcron job, Up: Systemkonfiguration [Contents][Index]
To connect to a Wireguard VPN server you need the kernel module to be loaded
in memory and a package providing networking tools that support it (e.g.
wireguard-tools
or network-manager
).
Here is a configuration example for Linux-Libre < 5.6, where the module is out of tree and need to be loaded manually—following revisions of the kernel have it built-in and so don’t need such configuration:
(use-modules (gnu)) (use-service-modules desktop) (use-package-modules vpn) (operating-system ;; … (services (cons (simple-service 'wireguard-module kernel-module-loader-service-type '("wireguard")) %desktop-services)) (packages (cons wireguard-tools %base-packages)) (kernel-loadable-modules (list wireguard-linux-compat)))
After reconfiguring and restarting your system you can either use Wireguard tools or NetworkManager to connect to a VPN server.
To test your Wireguard setup it is convenient to use wg-quick
.
Just give it a configuration file wg-quick up ./wg0.conf
; or put
that file in /etc/wireguard and run wg-quick up wg0
instead.
Observera: Be warned that the author described this command as a: “[…] very quick and dirty bash script […]”.
Thanks to NetworkManager support for Wireguard we can connect to our VPN
using nmcli
command. Up to this point this guide assumes that
you’re using Network Manager service provided by %desktop-services
.
Ortherwise you need to adjust your services list to load
network-manager-service-type
and reconfigure your Guix system.
To import your VPN configuration execute nmcli import command:
# nmcli connection import type wireguard file wg0.conf Connection 'wg0' (edbee261-aa5a-42db-b032-6c7757c60fde) successfully added
This will create a configuration file in /etc/NetworkManager/wg0.nmconnection. Next connect to the Wireguard server:
$ nmcli connection up wg0 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/6)
By default NetworkManager will connect automatically on system boot. To change that behaviour you need to edit your config:
# nmcli connection modify wg0 connection.autoconnect no
For more specific information about NetworkManager and wireguard see this post by thaller.
Next: Att köra Guix på en Linode-server, Previous: Att ansluta till Wireguard VPN, Up: Systemkonfiguration [Contents][Index]
Next: Sessionslås, Up: Att anpassa en fönsterhanterare [Contents][Index]
You could install StumpWM with a Guix system by adding stumpwm
and
optionally `(,stumpwm "lib")
packages to a system configuration file,
e.g. /etc/config.scm.
An example configuration can look like this:
(use-modules (gnu)) (use-package-modules wm) (operating-system ;; … (packages (append (list sbcl stumpwm `(,stumpwm "lib")) %base-packages)))
By default StumpWM uses X11 fonts, which could be small or pixelated on your
system. You could fix this by installing StumpWM contrib Lisp module
sbcl-ttf-fonts
, adding it to Guix system packages:
(use-modules (gnu)) (use-package-modules fonts wm) (operating-system ;; … (packages (append (list sbcl stumpwm `(,stumpwm "lib")) sbcl-ttf-fonts font-dejavu %base-packages)))
Then you need to add the following code to a StumpWM configuration file ~/.stumpwm.d/init.lisp:
(require :ttf-fonts) (setf xft:*font-dirs* '("/run/current-system/profile/share/fonts/")) (setf clx-truetype:+font-cache-filename+ (concat (getenv "HOME") "/.fonts/font-cache.sexp")) (xft:cache-fonts) (set-font (make-instance 'xft:font :family "DejaVu Sans Mono" :subfamily "Book" :size 11))
Previous: StumpWM, Up: Att anpassa en fönsterhanterare [Contents][Index]
Depending on your environment, locking the screen of your session might come built in or it might be something you have to set up yourself. If you use a desktop environment like GNOME or KDE, it’s usually built in. If you use a plain window manager like StumpWM or EXWM, you might have to set it up yourself.
Up: Sessionslås [Contents][Index]
If you use Xorg, you can use the utility xss-lock to lock the screen of your session. xss-lock is triggered by DPMS which since Xorg 1.8 is auto-detected and enabled if ACPI is also enabled at kernel runtime.
To use xss-lock, you can simple execute it and put it into the background before you start your window manager from e.g. your ~/.xsession:
xss-lock -- slock & exec stumpwm
In this example, xss-lock uses slock
to do the actual locking of the
screen when it determines it’s appropriate, like when you suspend your
device.
For slock to be allowed to be a screen locker for the graphical session, it needs to be made setuid-root so it can authenticate users, and it needs a PAM service. This can be achieved by adding the following service to your config.scm:
(service screen-locker-service-type
(screen-locker-configuration
(name "slock")
(program (file-append slock "/bin/slock"))))
If you manually lock your screen, e.g. by directly calling slock when you
want to lock your screen but not suspend it, it’s a good idea to notify
xss-lock about this so no confusion occurs. This can be done by executing
xset s activate
immediately before you execute slock.
Next: Att köra Guix på en Kimsufi-server, Previous: Att anpassa en fönsterhanterare, Up: Systemkonfiguration [Contents][Index]
To run Guix on a server hosted by Linode, start with a recommended Debian server. We recommend using the default distro as a way to bootstrap Guix. Create your SSH keys.
ssh-keygen
Be sure to add your SSH key for easy login to the remote server. This is trivially done via Linode’s graphical interface for adding SSH keys. Go to your profile and click add SSH Key. Copy into it the output of:
cat ~/.ssh/<username>_rsa.pub
Power the Linode down.
In the Linode’s Storage tab, resize the Debian disk to be smaller. 30 GB free space is recommended. Then click "Add a disk", and fill out the form with the following:
In the Configurations tab, press "Edit" on the default Debian profile. Under "Block Device Assignment" click "Add a Device". It should be /dev/sdc and you can select the "Guix" disk. Save Changes.
Now "Add a Configuration", with the following:
Now power it back up, booting with the Debian configuration. Once it’s
running, ssh to your server via ssh
root@<your-server-IP-here>
. (You can find your server IP address in
your Linode Summary section.) Now you can run the "install guix from
see Binary Installation in GNU Guix" steps:
sudo apt-get install gpg wget https://sv.gnu.org/people/viewgpg.php?user_id=15145 -qO - | gpg --import - wget https://git.savannah.gnu.org/cgit/guix.git/plain/etc/guix-install.sh chmod +x guix-install.sh ./guix-install.sh guix pull
Now it’s time to write out a config for the server. The key information is below. Save the resulting file as guix-config.scm.
(use-modules (gnu) (guix modules)) (use-service-modules networking ssh) (use-package-modules admin package-management ssh tls) (operating-system (host-name "my-server") (timezone "America/New_York") (locale "en_US.UTF-8") ;; This goofy code will generate the grub.cfg ;; without installing the grub bootloader on disk. (bootloader (bootloader-configuration (bootloader (bootloader (inherit grub-bootloader) (installer #~(const #true)))))) (file-systems (cons (file-system (device "/dev/sda") (mount-point "/") (type "ext4")) %base-file-systems)) (swap-devices (list "/dev/sdb")) (initrd-modules (cons "virtio_scsi" ; Needed to find the disk %base-initrd-modules)) (users (cons (user-account (name "janedoe") (group "users") ;; Adding the account to the "wheel" group ;; makes it a sudoer. (supplementary-groups '("wheel")) (home-directory "/home/janedoe")) %base-user-accounts)) (packages (cons* openssh-sans-x %base-packages)) (services (cons* (service dhcp-client-service-type) (service openssh-service-type (openssh-configuration (openssh openssh-sans-x) (password-authentication? #false) (authorized-keys `(("janedoe" ,(local-file "janedoe_rsa.pub")) ("root" ,(local-file "janedoe_rsa.pub")))))) %base-services)))
Replace the following fields in the above configuration:
(host-name "my-server") ; replace with your server name ; if you chose a linode server outside the U.S., then ; use tzselect to find a correct timezone string (timezone "America/New_York") ; if needed replace timezone (name "janedoe") ; replace with your username ("janedoe" ,(local-file "janedoe_rsa.pub")) ; replace with your ssh key ("root" ,(local-file "janedoe_rsa.pub")) ; replace with your ssh key
The last line in the above example lets you log into the server as root and set the initial root password (see the note at the end of this recipe about root login). After you have done this, you may delete that line from your configuration and reconfigure to prevent root login.
Copy your ssh public key (eg: ~/.ssh/id_rsa.pub) as <your-username-here>_rsa.pub and put guix-config.scm in the same directory. In a new terminal run these commands.
sftp root@<remote server ip address> put /path/to/files/<username>_rsa.pub . put /path/to/files/guix-config.scm .
In your first terminal, mount the guix drive:
mkdir /mnt/guix mount /dev/sdc /mnt/guix
Due to the way we set up the bootloader section of the guix-config.scm, only the grub configuration file will be installed. So, we need to copy over some of the other GRUB stuff already installed on the Debian system:
mkdir -p /mnt/guix/boot/grub cp -r /boot/grub/* /mnt/guix/boot/grub/
Now initialize the Guix installation:
guix system init guix-config.scm /mnt/guix
Ok, power it down! Now from the Linode console, select boot and select "Guix".
Once it boots, you should be able to log in via SSH! (The server config will have changed though.) You may encounter an error like:
$ ssh root@<server ip address> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that a host key has just been changed. The fingerprint for the ECDSA key sent by the remote host is SHA256:0B+wp33w57AnKQuHCvQP0+ZdKaqYrI/kyU7CfVbS7R4. Please contact your system administrator. Add correct host key in /home/joshua/.ssh/known_hosts to get rid of this message. Offending ECDSA key in /home/joshua/.ssh/known_hosts:3 ECDSA host key for 198.58.98.76 has changed and you have requested strict checking. Host key verification failed.
Either delete ~/.ssh/known_hosts file, or delete the offending line starting with your server IP address.
Be sure to set your password and root’s password.
ssh root@<remote ip address> passwd ; for the root password passwd <username> ; for the user password
You may not be able to run the above commands at this point. If you have issues remotely logging into your linode box via SSH, then you may still need to set your root and user password initially by clicking on the “Launch Console” option in your linode. Choose the “Glish” instead of “Weblish”. Now you should be able to ssh into the machine.
Hooray! At this point you can shut down the server, delete the Debian disk, and resize the Guix to the rest of the size. Congratulations!
By the way, if you save it as a disk image right at this point, you’ll have an easy time spinning up new Guix images! You may need to down-size the Guix image to 6144MB, to save it as an image. Then you can resize it again to the max size.
Next: Setting up a bind mount, Previous: Att köra Guix på en Linode-server, Up: Systemkonfiguration [Contents][Index]
To run Guix on a server hosted by Kimsufi, click on the netboot tab then select rescue64-pro and restart.
OVH will email you the credentials required to ssh into a Debian system.
Now you can run the "install guix from see Binary Installation in GNU Guix" steps:
wget https://git.savannah.gnu.org/cgit/guix.git/plain/etc/guix-install.sh chmod +x guix-install.sh ./guix-install.sh guix pull
Partition the drives and format them, first stop the raid array:
mdadm --stop /dev/md127 mdadm --zero-superblock /dev/sda2 /dev/sdb2
Then wipe the disks and set up the partitions, we will create a RAID 1 array.
wipefs -a /dev/sda wipefs -a /dev/sdb parted /dev/sda --align=opt -s -m -- mklabel gpt parted /dev/sda --align=opt -s -m -- \ mkpart bios_grub 1049kb 512MiB \ set 1 bios_grub on parted /dev/sda --align=opt -s -m -- \ mkpart primary 512MiB -512MiB set 2 raid on parted /dev/sda --align=opt -s -m -- mkpart primary linux-swap 512MiB 100% parted /dev/sdb --align=opt -s -m -- mklabel gpt parted /dev/sdb --align=opt -s -m -- \ mkpart bios_grub 1049kb 512MiB \ set 1 bios_grub on parted /dev/sdb --align=opt -s -m -- \ mkpart primary 512MiB -512MiB \ set 2 raid on parted /dev/sdb --align=opt -s -m -- mkpart primary linux-swap 512MiB 100%
Create the array:
mdadm --create /dev/md127 --level=1 --raid-disks=2 \ --metadata=0.90 /dev/sda2 /dev/sdb2
Now create file systems on the relevant partitions, first the boot partitions:
mkfs.ext4 /dev/sda1 mkfs.ext4 /dev/sdb1
Then the root partition:
mkfs.ext4 /dev/md127
Initialize the swap partitions:
mkswap /dev/sda3 swapon /dev/sda3 mkswap /dev/sdb3 swapon /dev/sdb3
Mount the guix drive:
mkdir /mnt/guix mount /dev/md127 /mnt/guix
Now is time to write an operating system declaration os.scm file; here is a sample:
(use-modules (gnu) (guix)) (use-service-modules networking ssh vpn virtualization sysctl admin mcron) (use-package-modules ssh tls tmux vpn virtualization) (operating-system (host-name "kimsufi") (bootloader (bootloader-configuration (bootloader grub-bootloader) (targets (list "/dev/sda" "/dev/sdb")) (terminal-outputs '(console)))) ;; Add a kernel module for RAID-1 (aka. "mirror"). (initrd-modules (cons* "raid1" %base-initrd-modules)) (mapped-devices (list (mapped-device (source (list "/dev/sda2" "/dev/sdb2")) (target "/dev/md127") (type raid-device-mapping)))) (swap-devices (list (swap-space (target "/dev/sda3")) (swap-space (target "/dev/sdb3")))) (issue ;; Default contents for /etc/issue. "\ This is the GNU system at Kimsufi. Welcome.\n") (file-systems (cons* (file-system (mount-point "/") (device "/dev/md127") (type "ext4") (dependencies mapped-devices)) %base-file-systems)) (users (cons (user-account (name "guix") (comment "guix") (group "users") (supplementary-groups '("wheel")) (home-directory "/home/guix")) %base-user-accounts)) (sudoers-file (plain-file "sudoers" "\ root ALL=(ALL) ALL %wheel ALL=(ALL) ALL guix ALL=(ALL) NOPASSWD:ALL\n")) ;; Globally-installed packages. (packages (cons* tmux gnutls wireguard-tools %base-packages)) (services (cons* (service static-networking-service-type (list (static-networking (addresses (list (network-address (device "enp3s0") (value "server-ip-address/24")))) (routes (list (network-route (destination "default") (gateway "server-gateway")))) (name-servers '("213.186.33.99"))))) (service unattended-upgrade-service-type) (service openssh-service-type (openssh-configuration (openssh openssh-sans-x) (permit-root-login #f) (authorized-keys `(("guix" ,(plain-file "ssh-key-name.pub" "ssh-public-key-content")))))) (modify-services %base-services (sysctl-service-type config => (sysctl-configuration (settings (append '(("net.ipv6.conf.all.autoconf" . "0") ("net.ipv6.conf.all.accept_ra" . "0")) %default-sysctl-settings))))))))
Kom ihåg att ersätta variablerna server-ip-address, server-gateway, ssh-key-name och ssh-public-key-content med dina egna värden.
The gateway is the last usable IP in your block so if you have a server with an IP of ‘37.187.79.10’ then its gateway will be ‘37.187.79.254’.
Transfer your operating system declaration os.scm file on the server
via the scp
or sftp
commands.
Now all that is left is to install Guix with a guix system init
and
restart.
However we first need to set up a chroot, because the root partition of the rescue system is mounted on an aufs partition and if you try to install Guix it will fail at the GRUB install step complaining about the canonical path of "aufs".
Install packages that will be used in the chroot:
guix install bash-static parted util-linux-with-udev coreutils guix
Then run the following to create directories needed for the chroot:
cd /mnt && \ mkdir -p bin etc gnu/store root/.guix-profile/ root/.config/guix/current \ var/guix proc sys dev
Copy the host resolv.conf in the chroot:
cp /etc/resolv.conf etc/
Mount block devices, the store and its database and the current guix config:
mount --rbind /proc /mnt/proc mount --rbind /sys /mnt/sys mount --rbind /dev /mnt/dev mount --rbind /var/guix/ var/guix/ mount --rbind /gnu/store gnu/store/ mount --rbind /root/.config/ root/.config/ mount --rbind /root/.guix-profile/bin/ bin mount --rbind /root/.guix-profile root/.guix-profile/
Chroot in /mnt and install the system:
chroot /mnt/ /bin/bash guix system init /root/os.scm /guix
Finally, from the web user interface (UI), change ‘netboot’ to ‘boot to disk’ and restart (also from the web UI).
Wait a few minutes and try to ssh with ssh
guix@server-ip-address> -i path-to-your-ssh-key
You should have a Guix system up and running on Kimsufi; congratulations!
Next: Att få ersättningar från Tor, Previous: Att köra Guix på en Kimsufi-server, Up: Systemkonfiguration [Contents][Index]
To bind mount a file system, one must first set up some definitions before
the operating-system
section of the system definition. In this
example we will bind mount a folder from a spinning disk drive to
/tmp, to save wear and tear on the primary SSD, without dedicating an
entire partition to be mounted as /tmp.
First, the source drive that hosts the folder we wish to bind mount should be defined, so that the bind mount can depend on it.
(define source-drive ;; "source-drive" can be named anything you want. (file-system (device (uuid "UUID goes here")) (mount-point "/path-to-spinning-disk-goes-here") (type "ext4"))) ;Make sure to set this to the appropriate type for your drive.
The source folder must also be defined, so that guix will know it’s not a regular block device, but a folder.
;; "source-directory" can be named any valid variable name. (define (%source-directory) "/path-to-spinning-disk-goes-here/tmp")
Finally, inside the file-systems
definition, we must add the mount
itself.
(file-systems (cons*
...<other drives omitted for clarity>...
;; Must match the name you gave the source drive in the earlier definition.
source-drive
(file-system
;; Make sure "source-directory" matches your earlier definition.
(device (%source-directory))
(mount-point "/tmp")
;; We are mounting a folder, not a partition, so this type needs to be "none"
(type "none")
(flags '(bind-mount))
;; Ensure "source-drive" matches what you've named the variable for the drive.
(dependencies (list source-drive))
)
...<other drives omitted for clarity>...
))
Next: Ställa in NGINX med Lua, Previous: Setting up a bind mount, Up: Systemkonfiguration [Contents][Index]
Guix-demon kan använda en HTTP-proxy för att få ersättningar, här konfigurerar vi den för få dem via Tor.
Varning: Not all Guix daemon’s traffic will go through Tor! Only HTTP/HTTPS will get proxied; FTP, Git protocol, SSH, etc connections will still go through the clearnet. Again, this configuration isn’t foolproof some of your traffic won’t get routed by Tor at all. Use it at your own risk.
Also note that the procedure described here applies only to package substitution. When you update your guix distribution with
guix pull
, you still need to usetorsocks
if you want to route the connection to guix’s git repository servers through Tor.
Guix ersättningsserver är tillgänglig som en Onion-tjänst, om du vill använda den för att få dina ersättningar genom Tor konfigurerar du ditt system enligt följande:
(use-modules (gnu)) (use-service-module base networking) (operating-system … (services (cons (service tor-service-type (tor-configuration (config-file (plain-file "tor-config" "HTTPTunnelPort 127.0.0.1:9250")))) (modify-services %base-services (guix-service-type config => (guix-configuration (inherit config) ;; ci.guix.gnu.org's Onion service (substitute-urls "\ https://4zwzi66wwdaalbhgnix55ea3ab4pvvw66ll2ow53kjub6se4q2bclcyd.onion") (http-proxy "http://localhost:9250")))))))
This will keep a tor process running that provides a HTTP CONNECT tunnel
which will be used by guix-daemon
. The daemon can use other
protocols than HTTP(S) to get remote resources, request using those
protocols won’t go through Tor since we are only setting a HTTP tunnel
here. Note that substitutes-urls
is using HTTPS and not HTTP or it
won’t work, that’s a limitation of Tor’s tunnel; you may want to use
privoxy
instead to avoid such limitations.
If you don’t want to always get substitutes through Tor but using it just
some of the times, then skip the guix-configuration
. When you want
to get a substitute from the Tor tunnel run:
sudo herd set-http-proxy guix-daemon http://localhost:9250 guix build \ --substitute-urls=https://4zwzi66wwdaalbhgnix55ea3ab4pvvw66ll2ow53kjub6se4q2bclcyd.onion …
Next: Musikserver med Bluetooth-ljud, Previous: Att få ersättningar från Tor, Up: Systemkonfiguration [Contents][Index]
NGINX could be extended with Lua scripts.
Guix provides NGINX service with ability to load Lua module and specific Lua packages, and reply to requests by evaluating Lua scripts.
The following example demonstrates system definition with configuration to evaluate index.lua Lua script on HTTP request to http://localhost/hello endpoint:
local shell = require "resty.shell" local stdin = "" local timeout = 1000 -- ms local max_size = 4096 -- byte local ok, stdout, stderr, reason, status = shell.run([[/run/current-system/profile/bin/ls /tmp]], stdin, timeout, max_size) ngx.say(stdout)
(use-modules (gnu)) (use-service-modules #;… web) (use-package-modules #;… lua) (operating-system ;; … (services ;; … (service nginx-service-type (nginx-configuration (modules (list (file-append nginx-lua-module "/etc/nginx/modules/ngx_http_lua_module.so"))) (lua-package-path (list lua-resty-core lua-resty-lrucache lua-resty-signal lua-tablepool lua-resty-shell)) (lua-package-cpath (list lua-resty-signal)) (server-blocks (list (nginx-server-configuration (server-name '("localhost")) (listen '("80")) (root "/etc") (locations (list (nginx-location-configuration (uri "/hello") (body (list #~(format #f "content_by_lua_file ~s;" #$(local-file "index.lua"))))))))))))))
Previous: Ställa in NGINX med Lua, Up: Systemkonfiguration [Contents][Index]
MPD, the Music Player Daemon, is a flexible server-side application for playing music. Client programs on different machines on the network — a mobile phone, a laptop, a desktop workstation — can connect to it to control the playback of audio files from your local music collection. MPD decodes the audio files and plays them back on one or many outputs.
By default MPD will play to the default audio device. In the example below we make things a little more interesting by setting up a headless music server. There will be no graphical user interface, no Pulseaudio daemon, and no local audio output. Instead we will configure MPD with two outputs: a bluetooth speaker and a web server to serve audio streams to any streaming media player.
Bluetooth is often rather frustrating to set up. You will have to pair your
Bluetooth device and make sure that the device is automatically connected as
soon as it powers on. The Bluetooth system service returned by the
bluetooth-service
procedure provides the infrastructure needed to set
this up.
Omkonfigurera ditt system med åtminstone följande tjänster och paket:
(operating-system
;; …
(packages (cons* bluez bluez-alsa
%base-packages))
(services
;; …
(dbus-service #:services (list bluez-alsa))
(bluetooth-service #:auto-enable? #t)))
Start the bluetooth
service and then use bluetoothctl
to
scan for Bluetooth devices. Try to identify your Bluetooth speaker and pick
out its device ID from the resulting list of devices that is indubitably
dominated by a baffling smorgasbord of your neighbors’ home automation
gizmos. This only needs to be done once:
$ bluetoothctl [NEW] Controller 00:11:22:33:95:7F BlueZ 5.40 [default] [bluetooth]# power on [bluetooth]# Changing power on succeeded [bluetooth]# agent on [bluetooth]# Agent registered [bluetooth]# default-agent [bluetooth]# Default agent request successful [bluetooth]# scan on [bluetooth]# Discovery started [CHG] Controller 00:11:22:33:95:7F Discovering: yes [NEW] Device AA:BB:CC:A4:AA:CD My Bluetooth Speaker [NEW] Device 44:44:FF:2A:20:DC My Neighbor's TV … [bluetooth]# pair AA:BB:CC:A4:AA:CD Attempting to pair with AA:BB:CC:A4:AA:CD [CHG] Device AA:BB:CC:A4:AA:CD Connected: yes [My Bluetooth Speaker]# [CHG] Device AA:BB:CC:A4:AA:CD UUIDs: 0000110b-0000-1000-8000-00xxxxxxxxxx [CHG] Device AA:BB:CC:A4:AA:CD UUIDs: 0000110c-0000-1000-8000-00xxxxxxxxxx [CHG] Device AA:BB:CC:A4:AA:CD UUIDs: 0000110e-0000-1000-8000-00xxxxxxxxxx [CHG] Device AA:BB:CC:A4:AA:CD Paired: yes Pairing successful [CHG] Device AA:BB:CC:A4:AA:CD Connected: no [bluetooth]# [bluetooth]# trust AA:BB:CC:A4:AA:CD [bluetooth]# [CHG] Device AA:BB:CC:A4:AA:CD Trusted: yes Changing AA:BB:CC:A4:AA:CD trust succeeded [bluetooth]# [bluetooth]# connect AA:BB:CC:A4:AA:CD Attempting to connect to AA:BB:CC:A4:AA:CD [bluetooth]# [CHG] Device AA:BB:CC:A4:AA:CD RSSI: -63 [CHG] Device AA:BB:CC:A4:AA:CD Connected: yes Connection successful [My Bluetooth Speaker]# scan off [CHG] Device AA:BB:CC:A4:AA:CD RSSI is nil Discovery stopped [CHG] Controller 00:11:22:33:95:7F Discovering: no
Congratulations, you can now automatically connect to your Bluetooth speaker!
It is now time to configure ALSA to use the bluealsa Bluetooth
module, so that you can define an ALSA pcm device corresponding to your
Bluetooth speaker. For a headless server using bluealsa with a fixed
Bluetooth device is likely simpler than configuring Pulseaudio and its
stream switching behavior. We configure ALSA by crafting a custom
alsa-configuration
for the alsa-service-type
. The
configuration will declare a pcm
type bluealsa
from the
bluealsa
module provided by the bluez-alsa
package, and then
define a pcm
device of that type for your Bluetooth speaker.
All that is left then is to make MPD send audio data to this ALSA device. We also add a secondary MPD output that makes the currently played audio files available as a stream through a web server on port 8080. When enabled a device on the network could listen to the audio stream by connecting any capable media player to the HTTP server on port 8080, independent of the status of the Bluetooth speaker.
What follows is the outline of an operating-system
declaration that
should accomplish the above-mentioned tasks:
(use-modules (gnu)) (use-service-modules audio dbus sound #;… etc) (use-package-modules audio linux #;… etc) (operating-system ;; … (packages (cons* bluez bluez-alsa %base-packages)) (services ;; … (service mpd-service-type (mpd-configuration (user "your-username") (music-dir "/path/to/your/music") (address "192.168.178.20") (outputs (list (mpd-output (type "alsa") (name "MPD") (extra-options ;; Use the same name as in the ALSA ;; configuration below. '((device . "pcm.btspeaker")))) (mpd-output (type "httpd") (name "streaming") (enabled? #false) (always-on? #true) (tags? #true) (mixer-type 'null) (extra-options '((encoder . "vorbis") (port . "8080") (bind-to-address . "192.168.178.20") (max-clients . "0") ;no limit (quality . "5.0") (format . "44100:16:1")))))))) (dbus-service #:services (list bluez-alsa)) (bluetooth-service #:auto-enable? #t) (service alsa-service-type (alsa-configuration (pulseaudio? #false) ;we don't need it (extra-options #~(string-append "\ # Declare Bluetooth audio device type \"bluealsa\" from bluealsa module pcm_type.bluealsa { lib \"" #$(file-append bluez-alsa "/lib/alsa-lib/libasound_module_pcm_bluealsa.so") "\" } # Declare control device type \"bluealsa\" from the same module ctl_type.bluealsa { lib \"" #$(file-append bluez-alsa "/lib/alsa-lib/libasound_module_ctl_bluealsa.so") "\" } # Define the actual Bluetooth audio device. pcm.btspeaker { type bluealsa device \"AA:BB:CC:A4:AA:CD\" # unique device identifier profile \"a2dp\" } # Define an associated controller. ctl.btspeaker { type bluealsa } "))))))
Enjoy the music with the MPD client of your choice or a media player capable of streaming via HTTP!
Next: Virtuella maskiner, Previous: Systemkonfiguration, Up: Kokbok för GNU Guix [Contents][Index]
The kernel Linux provides a number of shared facilities that are available to processes in the system. These facilities include a shared view on the file system, other processes, network devices, user and group identities, and a few others. Since Linux 3.19 a user can choose to unshare some of these shared facilities for selected processes, providing them (and their child processes) with a different view on the system.
A process with an unshared mount
namespace, for example, has its own
view on the file system — it will only be able to see directories that
have been explicitly bound in its mount namespace. A process with its own
proc
namespace will consider itself to be the only process running on
the system, running as PID 1.
Guix uses these kernel features to provide fully isolated environments and even complete Guix System containers, lightweight virtual machines that share the host system’s kernel. This feature comes in especially handy when using Guix on a foreign distribution to prevent interference from foreign libraries or configuration files that are available system-wide.
Next: Guix System-behållare, Up: Behållare [Contents][Index]
The easiest way to get started is to use guix shell
with the
--container option. See Invoking guix shell in GNU Guix
Reference Manual for a reference of valid options.
The following snippet spawns a minimal shell process with most namespaces unshared from the system. The current working directory is visible to the process, but anything else on the file system is unavailable. This extreme isolation can be very useful when you want to rule out any sort of interference from environment variables, globally installed libraries, or configuration files.
guix shell --container
It is a bleak environment, barren, desolate. You will find that not even the GNU coreutils are available here, so to explore this deserted wasteland you need to use built-in shell commands. Even the usually gigantic /gnu/store directory is reduced to a faint shadow of itself.
$ echo /gnu/store/* /gnu/store/…-gcc-10.3.0-lib /gnu/store/…-glibc-2.33 /gnu/store/…-bash-static-5.1.8 /gnu/store/…-ncurses-6.2.20210619 /gnu/store/…-bash-5.1.8 /gnu/store/…-profile /gnu/store/…-readline-8.1.1
There isn’t much you can do in an environment like this other than exiting
it. You can use ^D or exit
to terminate this limited shell
environment.
You can make other directories available inside of the container environment; use --expose=DIRECTORY to bind-mount the given directory as a read-only location inside the container, or use --share=DIRECTORY to make the location writable. With an additional mapping argument after the directory name you can control the name of the directory inside the container. In the following example we map /etc on the host system to /the/host/etc inside a container in which the GNU coreutils are installed.
$ guix shell --container --share=/etc=/the/host/etc coreutils $ ls /the/host/etc
Similarly, you can prevent the current working directory from being mapped into the container with the --no-cwd option. Another good idea is to create a dedicated directory that will serve as the container’s home directory, and spawn the container shell from that directory.
On a foreign system a container environment can be used to compile software
that cannot possibly be linked with system libraries or with the system’s
compiler toolchain. A common use-case in a research context is to install
packages from within an R session. Outside of a container environment there
is a good chance that the foreign compiler toolchain and incompatible system
libraries are found first, resulting in incompatible binaries that cannot be
used by R. In a container shell this problem disappears, as system
libraries and executables simply aren’t available due to the unshared
mount
namespace.
Let’s take a comprehensive manifest providing a comfortable development environment for use with R:
(specifications->manifest
(list "r-minimal"
;; base packages
"bash-minimal"
"glibc-locales"
"nss-certs"
;; Common command line tools lest the container is too empty.
"coreutils"
"grep"
"which"
"wget"
"sed"
;; R markdown tools
"pandoc"
;; Toolchain and common libraries for "install.packages"
"gcc-toolchain@10"
"gfortran-toolchain"
"gawk"
"tar"
"gzip"
"unzip"
"make"
"cmake"
"pkg-config"
"cairo"
"libxt"
"openssl"
"curl"
"zlib"))
Let’s use this to run R inside a container environment. For convenience we
share the net
namespace to use the host system’s network interfaces.
Now we can build R packages from source the traditional way without having
to worry about ABI mismatch or incompatibilities.
$ guix shell --container --network --manifest=manifest.scm -- R R version 4.2.1 (2022-06-23) -- "Funny-Looking Kid" Copyright (C) 2022 The R Foundation for Statistical Computing … > e <- Sys.getenv("GUIX_ENVIRONMENT") > Sys.setenv(GIT_SSL_CAINFO=paste0(e, "/etc/ssl/certs/ca-certificates.crt")) > Sys.setenv(SSL_CERT_FILE=paste0(e, "/etc/ssl/certs/ca-certificates.crt")) > Sys.setenv(SSL_CERT_DIR=paste0(e, "/etc/ssl/certs")) > install.packages("Cairo", lib=paste0(getwd())) … * installing *source* package 'Cairo' ... … * DONE (Cairo) The downloaded source packages are in '/tmp/RtmpCuwdwM/downloaded_packages' > library("Cairo", lib=getwd()) > # success!
Using container shells is fun, but they can become a little cumbersome when you want to go beyond just a single interactive process. Some tasks become a lot easier when they sit on the rock solid foundation of a proper Guix System and its rich set of system services. The next section shows you how to launch a complete Guix System inside of a container.
Previous: Guix-behållare, Up: Behållare [Contents][Index]
The Guix System provides a wide array of interconnected system services that are configured declaratively to form a dependable stateless GNU System foundation for whatever tasks you throw at it. Even when using Guix on a foreign distribution you can benefit from the design of Guix System by running a system instance as a container. Using the same kernel features of unshared namespaces mentioned in the previous section, the resulting Guix System instance is isolated from the host system and only shares file system locations that you explicitly declare.
A Guix System container differs from the shell process created by
guix shell --container
in a number of important ways. While in a
container shell the containerized process is a Bash shell process, a Guix
System container runs the Shepherd as PID 1. In a system container all
system services (see Services in GNU Guix Reference Manual) are
set up just as they would be on a Guix System in a virtual machine or on
bare metal—this includes daemons managed by the GNU Shepherd
(see Shepherd Services in GNU Guix Reference Manual) as well as
other kinds of extensions to the operating system (see Service
Composition in GNU Guix Reference Manual).
The perceived increase in complexity of running a Guix System container is easily justified when dealing with more complex applications that have higher or just more rigid requirements on their execution contexts—configuration files, dedicated user accounts, directories for caches or log files, etc. In Guix System the demands of this kind of software are satisfied through the deployment of system services.
Next: Container Networking, Up: Guix System-behållare [Contents][Index]
A good example might be a PostgreSQL database server. Much of the complexity of setting up such a database server is encapsulated in this deceptively short service declaration:
(service postgresql-service-type
(postgresql-configuration
(postgresql postgresql-14)))
A complete operating system declaration for use with a Guix System container would look something like this:
(use-modules (gnu)) (use-package-modules databases) (use-service-modules databases) (operating-system (host-name "container") (timezone "Europe/Berlin") (file-systems (cons (file-system (device (file-system-label "does-not-matter")) (mount-point "/") (type "ext4")) %base-file-systems)) (bootloader (bootloader-configuration (bootloader grub-bootloader) (targets '("/dev/sdX")))) (services (cons* (service postgresql-service-type (postgresql-configuration (postgresql postgresql-14) (config-file (postgresql-config-file (log-destination "stderr") (hba-file (plain-file "pg_hba.conf" "\ local all all trust host all all 10.0.0.1/32 trust")) (extra-config '(("listen_addresses" "*") ("log_directory" "/var/log/postgresql"))))))) (service postgresql-role-service-type (postgresql-role-configuration (roles (list (postgresql-role (name "test") (create-database? #t)))))) %base-services)))
With postgresql-role-service-type
we define a role “test” and
create a matching database, so that we can test right away without any
further manual setup. The postgresql-config-file
settings allow a
client from IP address 10.0.0.1 to connect without requiring
authentication—a bad idea in production systems, but convenient for this
example.
Let’s build a script that will launch an instance of this Guix System as a
container. Write the operating-system
declaration above to a file
os.scm and then use guix system container
to build the
launcher. (see Invoking guix system in GNU Guix Reference
Manual).
$ guix system container os.scm The following derivations will be built: /gnu/store/…-run-container.drv … building /gnu/store/…-run-container.drv... /gnu/store/…-run-container
Now that we have a launcher script we can run it to spawn the new system
with a running PostgreSQL service. Note that due to some as yet unresolved
limitations we need to run the launcher as the root user, for example with
sudo
.
$ sudo /gnu/store/…-run-container system container is running as PID 5983 …
Background the process with Ctrl-z followed by bg
. Note the
process ID in the output; we will need it to connect to the container
later. You know what? Let’s try attaching to the container right now. We
will use nsenter
, a tool provided by the util-linux
package:
$ guix shell util-linux $ sudo nsenter -a -t 5983 root@container /# pgrep -a postgres 49 /gnu/store/…-postgresql-14.4/bin/postgres -D /var/lib/postgresql/data --config-file=/gnu/store/…-postgresql.conf -p 5432 51 postgres: checkpointer 52 postgres: background writer 53 postgres: walwriter 54 postgres: autovacuum launcher 55 postgres: stats collector 56 postgres: logical replication launcher root@container /# exit
The PostgreSQL service is running in the container!
Previous: En databasbehållare, Up: Guix System-behållare [Contents][Index]
What good is a Guix System running a PostgreSQL database service as a container when we can only talk to it with processes originating in the container? It would be much better if we could talk to the database over the network.
The easiest way to do this is to create a pair of connected virtual Ethernet
devices (known as veth
). We move one of the devices
(ceth-test
) into the net
namespace of the container and leave
the other end (veth-test
) of the connection on the host system.
pid=5983 ns="guix-test" host="veth-test" client="ceth-test" # Attach the new net namespace "guix-test" to the container PID. sudo ip netns attach $ns $pid # Create the pair of devices sudo ip link add $host type veth peer name $client # Move the client device into the container's net namespace sudo ip link set $client netns $ns
Then we configure the host side:
sudo ip link set $host up sudo ip addr add 10.0.0.1/24 dev $host
…and then we configure the client side:
sudo ip netns exec $ns ip link set lo up sudo ip netns exec $ns ip link set $client up sudo ip netns exec $ns ip addr add 10.0.0.2/24 dev $client
At this point the host can reach the container at IP address 10.0.0.2, and the container can reach the host at IP 10.0.0.1. This is all we need to talk to the database server inside the container from the host system on the outside.
$ psql -h 10.0.0.2 -U test psql (14.4) Type "help" for help. test=> CREATE TABLE hello (who TEXT NOT NULL); CREATE TABLE test=> INSERT INTO hello (who) VALUES ('world'); INSERT 0 1 test=> SELECT * FROM hello; who ------- world (1 row)
Now that we’re done with this little demonstration let’s clean up:
sudo kill $pid sudo ip netns del $ns sudo ip link del $host
Next: Avancerad pakethantering, Previous: Behållare, Up: Kokbok för GNU Guix [Contents][Index]
Guix can produce disk images (see Invoking guix system in GNU Guix Reference Manual) that can be used with virtual machines solutions such as virt-manager, GNOME Boxes or the more bare QEMU, among others.
This chapter aims to provide hands-on, practical examples that relates to the usage and configuration of virtual machines on a Guix System.
Next: Routed network for libvirt, Up: Virtuella maskiner [Contents][Index]
By default, QEMU uses a so-called “user mode” host network back-end, which
is convenient as it does not require any configuration. Unfortunately, it
is also quite limited. In this mode, the guest VM (virtual machine)
can access the network the same way the host would, but it cannot be reached
from the host. Additionally, since the QEMU user networking mode relies on
ICMP, ICMP-based networking tools such as ping
do not work
in this mode. Thus, it is often desirable to configure a network bridge,
which enables the guest to fully participate in the network. This is
necessary, for example, when the guest is to be used as a server.
There are many ways to create a network bridge. The following command shows
how to use NetworkManager and its nmcli
command line interface
(CLI) tool, which should already be available if your operating system
declaration is based on one of the desktop templates:
# nmcli con add type bridge con-name br0 ifname br0
To have this bridge be part of your network, you must associate your network bridge with the Ethernet interface used to connect with the network. Assuming your interface is named ‘enp2s0’, the following command can be used to do so:
# nmcli con add type bridge-slave ifname enp2s0 master br0
Important: Only Ethernet interfaces can be added to a bridge. For wireless interfaces, consider the routed network approach detailed in See Routed network for libvirt.
By default, the network bridge will allow your guests to obtain their IP address via DHCP, if available on your local network. For simplicity, this is what we will use here. To easily find the guests, they can be configured to advertise their host names via mDNS.
QEMU comes with a helper program to conveniently make use of a network
bridge interface as an unprivileged user see Network options in QEMU Documentation. The binary must be made setuid root for proper
operation; this can be achieved by adding it to the
privileged-programs
field of your (host) operating-system
definition, as shown below:
(privileged-programs (cons (privileged-program (program (file-append qemu "/libexec/qemu-bridge-helper")) (setuid? #t)) %default-privileged-programs))
The file /etc/qemu/bridge.conf must also be made to allow the bridge interface, as the default is to deny all. Add the following to your list of services to do so:
(extra-special-file "/etc/qemu/host.conf" "allow br0\n")
When invoking QEMU, the following options should be provided so that the network bridge is used, after having selected a unique MAC address for the guest.
Important: By default, a single MAC address is used for all guests, unless provided. Failing to provide different MAC addresses to each virtual machine making use of the bridge would cause networking issues.
$ qemu-system-x86_64 [...] \ -device virtio-net-pci,netdev=user0,mac=XX:XX:XX:XX:XX:XX \ -netdev bridge,id=user0,br=br0 \ [...]
To generate MAC addresses that have the QEMU registered prefix, the following snippet can be employed:
mac_address="52:54:00:$(dd if=/dev/urandom bs=512 count=1 2>/dev/null \ | md5sum \ | sed -E 's/^(..)(..)(..).*$/\1:\2:\3/')" echo $mac_address
If you use Docker on your machine, you may experience connectivity issues
when attempting to use a network bridge, which are caused by Docker also
relying on network bridges and configuring its own routing rules. The
solution is add the following iptables
snippet to your
operating-system
declaration:
(service iptables-service-type (iptables-configuration (ipv4-rules (plain-file "iptables.rules" "\ *filter :INPUT ACCEPT [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0] -A FORWARD -i br0 -o br0 -j ACCEPT COMMIT "))
Previous: Nätverksbrygga för QEMU, Up: Virtuella maskiner [Contents][Index]
If the machine hosting your virtual machines is connected wirelessly to the
network, you won’t be able to use a true network bridge as explained in the
preceding section (see Nätverksbrygga för QEMU). In this case, the next
best option is to use a virtual bridge with static routing and to
configure a libvirt-powered virtual machine to use it (via the
virt-manager
GUI for example). This is similar to the default
mode of operation of QEMU/libvirt, except that instead of using NAT (Network Address Translation), it relies on static routes to join the
VM (virtual machine) IP address to the LAN (local area
network). This provides two-way connectivity to and from the virtual
machine, which is needed for exposing services hosted on the virtual
machine.
A virtual network bridge consists of a few components/configurations, such
as a TUN (network tunnel) interface, DHCP server (dnsmasq) and
firewall rules (iptables). The virsh
command, provided by the
libvirt
package, makes it very easy to create a virtual bridge. You
first need to choose a network subnet for your virtual bridge; if your home
LAN is in the ‘192.168.1.0/24’ network, you could opt to use e.g.
‘192.168.2.0/24’. Define an XML file, e.g. /tmp/virbr0.xml,
containing the following:
<network> <name>virbr0</name> <bridge name="virbr0" /> <forward mode="route"/> <ip address="192.168.2.0" netmask="255.255.255.0"> <dhcp> <range start="192.168.2.1" end="192.168.2.254"/> </dhcp> </ip> </network>
Then create and configure the interface using the virsh
command,
as root:
virsh net-define /tmp/virbr0.xml virsh net-autostart virbr0 virsh net-start virbr0
The ‘virbr0’ interface should now be visible e.g. via the ‘ip address’ command. It will be automatically started every time your libvirt virtual machine is started.
If you configured your virtual machine to use your newly created ‘virbr0’ virtual bridge interface, it should already receive an IP via DHCP such as ‘192.168.2.15’ and be reachable from the server hosting it, e.g. via ‘ping 192.168.2.15’. There’s one last configuration needed so that the VM can reach the external network: adding static routes to the network’s router.
In this example, the LAN network is ‘192.168.1.0/24’ and the router configuration web page may be accessible via e.g. the http://192.168.1.1 page. On a router running the libreCMC firmware, you would navigate to the Network → Static Routes page (https://192.168.1.1/cgi-bin/luci/admin/network/routes), and you would add a new entry to the ‘Static IPv4 Routes’ with the following information:
lan
192.168.2.0
255.255.255.0
server-ip
unicast
where server-ip is the IP address of the machine hosting the VMs, which should be static.
After saving/applying this new static route, external connectivity should work from within your VM; you can e.g. run ‘ping gnu.org’ to verify that it functions correctly.
Next: Programutveckling, Previous: Virtuella maskiner, Up: Kokbok för GNU Guix [Contents][Index]
Guix är en funktionell pakethanterare som erbjuder många fler funktioner än vad traditionella pakethanterare gör. För den oinvigde kan dessa funktioner vid en första anblick tyckas sakna uppenbart användningsområde. Syftet med det här kapitlet är att demonstrera några avancerade pakethanteringsbegrepp.
see Package Management in GNU Guix Reference Manual for a complete reference.
Guix provides a very useful feature that may be quite foreign to newcomers: profiles. They are a way to group package installations together and all users on the same system are free to use as many profiles as they want.
Whether you’re a developer or not, you may find that multiple profiles bring you great power and flexibility. While they shift the paradigm somewhat compared to traditional package managers, they are very convenient to use once you’ve understood how to set them up.
Observera: This section is an opinionated guide on the use of multiple profiles. It predates
guix shell
and its fast profile cache (see Invoking guix shell in GNU Guix Reference Manual).In many cases, you may find that using
guix shell
to set up the environment you need, when you need it, is less work that maintaining a dedicated profile. Your call!
If you are familiar with Python’s ‘virtualenv’, you can think of a profile as a kind of universal ‘virtualenv’ that can hold any kind of software whatsoever, not just Python software. Furthermore, profiles are self-sufficient: they capture all the runtime dependencies which guarantees that all programs within a profile will always work at any point in time.
Multiple profiles have many benefits:
Concretely, here follows some typical profiles:
Let’s dive in the set up!
Next: Nödvändiga paket, Up: Guix-profiler i praktiken [Contents][Index]
A Guix profile can be set up via a manifest. A manifest is a snippet of Scheme code that specifies the set of packages you want to have in your profile; it looks like this:
(specifications->manifest
'("package-1"
;; Version 1.3 of package-2.
"package-2@1.3"
;; The "lib" output of package-3.
"package-3:lib"
; ...
"package-N"))
See Writing Manifests in GNU Guix Reference Manual, for more information about the syntax.
We can create a manifest specification per profile and install them this way:
GUIX_EXTRA_PROFILES=$HOME/.guix-extra-profiles mkdir -p "$GUIX_EXTRA_PROFILES"/my-project # if it does not exist yet guix package --manifest=/path/to/guix-my-project-manifest.scm \ --profile="$GUIX_EXTRA_PROFILES"/my-project/my-project
Here we set an arbitrary variable ‘GUIX_EXTRA_PROFILES’ to point to the directory where we will store our profiles in the rest of this article.
Placing all your profiles in a single directory, with each profile getting its own sub-directory, is somewhat cleaner. This way, each sub-directory will contain all the symlinks for precisely one profile. Besides, “looping over profiles” becomes obvious from any programming language (e.g. a shell script) by simply looping over the sub-directories of ‘$GUIX_EXTRA_PROFILES’.
Note that it’s also possible to loop over the output of
guix package --list-profiles
although you’ll probably have to filter out ~/.config/guix/current.
To enable all profiles on login, add this to your ~/.bash_profile (or similar):
for i in $GUIX_EXTRA_PROFILES/*; do profile=$i/$(basename "$i") if [ -f "$profile"/etc/profile ]; then GUIX_PROFILE="$profile" . "$GUIX_PROFILE"/etc/profile fi unset profile done
Note to Guix System users: the above reflects how your default profile ~/.guix-profile is activated from /etc/profile, that latter being loaded by ~/.bashrc by default.
You can obviously choose to only enable a subset of them:
for i in "$GUIX_EXTRA_PROFILES"/my-project-1 "$GUIX_EXTRA_PROFILES"/my-project-2; do profile=$i/$(basename "$i") if [ -f "$profile"/etc/profile ]; then GUIX_PROFILE="$profile" . "$GUIX_PROFILE"/etc/profile fi unset profile done
When a profile is off, it’s straightforward to enable it for an individual shell without "polluting" the rest of the user session:
GUIX_PROFILE="path/to/my-project" ; . "$GUIX_PROFILE"/etc/profile
The key to enabling a profile is to source its ‘etc/profile’ file. This file contains shell code that exports the right environment variables necessary to activate the software contained in the profile. It is built automatically by Guix and meant to be sourced. It contains the same variables you would get if you ran:
guix package --search-paths=prefix --profile=$my_profile"
Once again, see Invoking guix package in GNU Guix Reference Manual for the command line options.
To upgrade a profile, simply install the manifest again:
guix package -m /path/to/guix-my-project-manifest.scm \ -p "$GUIX_EXTRA_PROFILES"/my-project/my-project
To upgrade all profiles, it’s easy enough to loop over them. For instance, assuming your manifest specifications are stored in ~/.guix-manifests/guix-$profile-manifest.scm, with ‘$profile’ being the name of the profile (e.g. "project1"), you could do the following in Bourne shell:
for profile in "$GUIX_EXTRA_PROFILES"/*; do guix package --profile="$profile" \ --manifest="$HOME/.guix-manifests/guix-$profile-manifest.scm" done
Each profile has its own generations:
guix package -p "$GUIX_EXTRA_PROFILES"/my-project/my-project --list-generations
You can roll-back to any generation of a given profile:
guix package -p "$GUIX_EXTRA_PROFILES"/my-project/my-project --switch-generations=17
Finally, if you want to switch to a profile without inheriting from the current environment, you can activate it from an empty shell:
env -i $(which bash) --login --noprofile --norc . my-project/etc/profile
Next: Standardprofil, Previous: Grundläggande inställning med manifest, Up: Guix-profiler i praktiken [Contents][Index]
Activating a profile essentially boils down to exporting a bunch of environmental variables. This is the role of the ‘etc/profile’ within the profile.
Note: Only the environmental variables of the packages that consume them will be set.
For instance, ‘MANPATH’ won’t be set if there is no consumer application for man pages within the profile. So if you need to transparently access man pages once the profile is loaded, you’ve got two options:
export MANPATH=/path/to/profile${MANPATH:+:}$MANPATH
The same is true for ‘INFOPATH’ (you can install ‘info-reader’), ‘PKG_CONFIG_PATH’ (install ‘pkg-config’), etc.
Next: Manifestens fördelar, Previous: Nödvändiga paket, Up: Guix-profiler i praktiken [Contents][Index]
What about the default profile that Guix keeps in ~/.guix-profile?
You can assign it the role you want. Typically you would install the manifest of the packages you want to use all the time.
Alternatively, you could keep it “manifest-less” for throw-away packages that you would just use for a couple of days. This way makes it convenient to run
guix install package-foo guix upgrade package-bar
without having to specify the path to a profile.
Next: Reproducerbara profiler, Previous: Standardprofil, Up: Guix-profiler i praktiken [Contents][Index]
Manifests let you declare the set of packages you’d like to have in a profile (see Writing Manifests in GNU Guix Reference Manual). They are a convenient way to keep your package lists around and, say, to synchronize them across multiple machines using a version control system.
A common complaint about manifests is that they can be slow to install when they contain large number of packages. This is especially cumbersome when you just want get an upgrade for one package within a big manifest.
This is one more reason to use multiple profiles, which happen to be just perfect to break down manifests into multiple sets of semantically connected packages. Using multiple, small profiles provides more flexibility and usability.
Manifests come with multiple benefits. In particular, they ease maintenance:
guix package --upgrade
always tries to update the packages that have
propagated inputs, even if there is nothing to do. Guix manifests remove
this problem.
guix install
, guix upgrade
, etc. do not, since they
produce different profiles every time even when they hold the same
packages. See the related
discussion on the matter.
guix weather -m manifest.scm
to see how many
substitutes are available, which can help you decide whether you want to try
upgrading today or wait a while. Another example: you can run guix
pack -m manifest.scm
to create a pack containing all the packages in the
manifest (and their transitive references).
It’s important to understand that while manifests can be used to declare
profiles, they are not strictly equivalent: profiles have the side effect
that they “pin” packages in the store, which prevents them from being
garbage-collected (see Invoking guix gc in GNU Guix Reference
Manual) and ensures that they will still be available at any point in the
future. The guix shell
command also protects recently-used
profiles from garbage collection; profiles that have not been used for a
while may be garbage-collected though, along with the packages they refer
to.
To be 100% sure that a given profile will never be collected, install the
manifest to a profile and use GUIX_PROFILE=/the/profile;
. "$GUIX_PROFILE"/etc/profile
as explained above: this guarantees that our
hacking environment will be available at all times.
Säkerhetsvarning: Kom ihåg att medan gamla profiler kan vara bekvämt att behålla kan det vara så att föråldrade paket inte har fått de senaste säkerhetsfixarna.
Previous: Manifestens fördelar, Up: Guix-profiler i praktiken [Contents][Index]
To reproduce a profile bit-for-bit, we need two pieces of information:
Indeed, manifests alone might not be enough: different Guix versions (or different channels) can produce different outputs for a given manifest.
You can output the Guix channel specification with ‘guix describe --format=channels’ (see Invoking guix describe in GNU Guix Reference Manual). Save this to a file, say ‘channel-specs.scm’.
On another computer, you can use the channel specification file and the manifest to reproduce the exact same profile:
GUIX_EXTRA_PROFILES=$HOME/.guix-extra-profiles GUIX_EXTRA=$HOME/.guix-extra mkdir -p "$GUIX_EXTRA"/my-project guix pull --channels=channel-specs.scm --profile="$GUIX_EXTRA/my-project/guix" mkdir -p "$GUIX_EXTRA_PROFILES/my-project" "$GUIX_EXTRA"/my-project/guix/bin/guix package \ --manifest=/path/to/guix-my-project-manifest.scm \ --profile="$GUIX_EXTRA_PROFILES"/my-project/my-project
It’s safe to delete the Guix channel profile you’ve just installed with the channel specification, the project profile does not depend on it.
Next: Miljöhantering, Previous: Avancerad pakethantering, Up: Kokbok för GNU Guix [Contents][Index]
Guix is a handy tool for developers; guix shell
, in particular,
gives a standalone development environment for your package, no matter what
language(s) it’s written in (see Invoking guix shell in GNU Guix
Reference Manual). To benefit from it, you have to initially write a
package definition and have it either in Guix proper, or in a channel, or
directly in your project’s source tree as a guix.scm file. This last
option is appealing: all developers have to do to get set up is clone the
project’s repository and run guix shell
, with no arguments.
Development needs go beyond development environments though. How can developers perform continuous integration of their code in Guix build environments? How can they deliver their code straight to adventurous users? This chapter describes a set of files developers can add to their repository to set up Guix-based development environments, continuous integration, and continuous delivery—all at once1.
Next: Level 1: Building with Guix, Up: Programutveckling [Contents][Index]
How do we go about “Guixifying” a repository? The first step, as we’ve
seen, will be to add a guix.scm at the root of the repository in
question. We’ll take Guile as an
example in this chapter: it’s written in Scheme (mostly) and C, and has a
number of dependencies—a C compilation tool chain, C libraries, Autoconf
and its friends, LaTeX, and so on. The resulting guix.scm looks like
the usual package definition (see Defining Packages in GNU Guix
Reference Manual), just without the define-public
bit:
;; The ‘guix.scm’ file for Guile, for use by ‘guix shell’. (use-modules (guix) (guix build-system gnu) ((guix licenses) #:prefix license:) (gnu packages autotools) (gnu packages base) (gnu packages bash) (gnu packages bdw-gc) (gnu packages compression) (gnu packages flex) (gnu packages gdb) (gnu packages gettext) (gnu packages gperf) (gnu packages libffi) (gnu packages libunistring) (gnu packages linux) (gnu packages pkg-config) (gnu packages readline) (gnu packages tex) (gnu packages texinfo) (gnu packages version-control)) (package (name "guile") (version "3.0.99-git") ;funky version number (source #f) ;no source (build-system gnu-build-system) (native-inputs (append (list autoconf automake libtool gnu-gettext flex texinfo texlive-base ;for "make pdf" texlive-epsf gperf git gdb strace readline lzip pkg-config) ;; When cross-compiling, a native version of Guile itself is ;; needed. (if (%current-target-system) (list this-package) '()))) (inputs (list libffi bash-minimal)) (propagated-inputs (list libunistring libgc)) (native-search-paths (list (search-path-specification (variable "GUILE_LOAD_PATH") (files '("share/guile/site/3.0"))) (search-path-specification (variable "GUILE_LOAD_COMPILED_PATH") (files '("lib/guile/3.0/site-ccache"))))) (synopsis "Scheme implementation intended especially for extensions") (description "Guile is the GNU Ubiquitous Intelligent Language for Extensions, and it's actually a full-blown Scheme implementation!") (home-page "https://www.gnu.org/software/guile/") (license license:lgpl3+))
Quite a bit of boilerplate, but now someone who’d like to hack on Guile now only needs to run:
guix shell
That gives them a shell containing all the dependencies of Guile: those
listed above, but also implicit dependencies such as the GCC tool
chain, GNU Make, sed, grep, and so on. See Invoking guix shell in GNU Guix Reference Manual, for more info on guix shell
.
The chef’s recommendation: Our suggestion is to create development environments like this:
guix shell --container --link-profile... or, for short:
guix shell -CPThat gives a shell in an isolated container, and all the dependencies show up in
$HOME/.guix-profile
, which plays well with caches such as config.cache (see Cache Files in Autoconf) and absolute file names recorded in generatedMakefile
s and the likes. The fact that the shell runs in a container brings peace of mind: nothing but the current directory and Guile’s dependencies is visible inside the container; nothing from the system can possibly interfere with your development.
Next: Level 2: The Repository as a Channel, Previous: Att komma igång, Up: Programutveckling [Contents][Index]
Now that we have a package definition (see Att komma igång), why not
also take advantage of it so we can build Guile with Guix? We had left the
source
field empty, because guix shell
above only cares
about the inputs of our package—so it can set up the development
environment—not about the package itself.
To build the package with Guix, we’ll need to fill out the source
field, along these lines:
(use-modules (guix) (guix git-download) ;for ‘git-predicate’ …) (define vcs-file? ;; Return true if the given file is under version control. (or (git-predicate (current-source-directory)) (const #t))) ;not in a Git checkout (package (name "guile") (version "3.0.99-git") ;funky version number (source (local-file "." "guile-checkout" #:recursive? #t #:select? vcs-file?)) …)
Here’s what we changed compared to the previous section:
(guix git-download)
to our set of imported modules, so we
can use its git-predicate
procedure.
vcs-file?
as a procedure that returns true when passed a
file that is under version control. For good measure, we add a fallback case
for when we’re not in a Git checkout: always return true.
source
to a
local-file
—a
recursive copy of the current directory ("."
), limited to files under
version control (the #:select?
bit).
From there on, our guix.scm file serves a second purpose: it lets us build the software with Guix. The whole point of building with Guix is that it’s a “clean” build—you can be sure nothing from your working tree or system interferes with the build result—and it lets you test a variety of things. First, you can do a plain native build:
guix build -f guix.scm
But you can also build for another system (possibly after setting up see offloading in GNU Guix Reference Manual or see transparent emulation in GNU Guix Reference Manual):
guix build -f guix.scm -s aarch64-linux -s riscv64-linux
… or cross-compile:
guix build -f guix.scm --target=x86_64-w64-mingw32
You can also use package transformations to test package variants (see Package Transformation Options in GNU Guix Reference Manual):
# What if we built with Clang instead of GCC? guix build -f guix.scm \ --with-c-toolchain=guile@3.0.99-git=clang-toolchain # What about that under-tested configure flag? guix build -f guix.scm \ --with-configure-flag=guile@3.0.99-git=--disable-networking
Handy!
Next: Bonus: Package Variants, Previous: Level 1: Building with Guix, Up: Programutveckling [Contents][Index]
We now have a Git repository containing (among other things) a package definition (see Level 1: Building with Guix). Can’t we turn it into a channel (see Channels in GNU Guix Reference Manual)? After all, channels are designed to ship package definitions to users, and that’s exactly what we’re doing with our guix.scm.
Turns out we can indeed turn it into a channel, but with one caveat: we must
create a separate directory for the .scm
file(s) of our channel so
that guix pull
doesn’t load unrelated .scm
files when
someone pulls the channel—and in Guile, there are lots of them! So we’ll
start like this, keeping a top-level guix.scm symlink for the sake of
guix shell
:
mkdir -p .guix/modules mv guix.scm .guix/modules/guile-package.scm ln -s .guix/modules/guile-package.scm guix.scm
To make it usable as part of a channel, we need to turn our guix.scm
file into a package module (see Package Modules in GNU Guix
Reference Manual): we do that by changing the use-modules
form at
the top to a define-module
form. We also need to actually
export a package variable, with define-public
, while still
returning the package value at the end of the file so we can still use
guix shell
and guix build -f guix.scm
. The end result
looks like this (not repeating things that haven’t changed):
(define-module (guile-package) #:use-module (guix) #:use-module (guix git-download) ;for ‘git-predicate’ …) (define vcs-file? ;; Return true if the given file is under version control. (or (git-predicate (dirname (dirname (current-source-directory)))) (const #t))) ;not in a Git checkout (define-public guile (package (name "guile") (version "3.0.99-git") ;funky version number (source (local-file "../.." "guile-checkout" #:recursive? #t #:select? vcs-file?)) …)) ;; Return the package object define above at the end of the module. guile
We need one last thing: a
.guix-channel
file so Guix knows where to look for package modules in our repository:
;; This file lets us present this repo as a Guix channel. (channel (version 0) (directory ".guix/modules")) ;look for package modules under .guix/modules/
To recap, we now have these files:
. ├── .guix-channel ├── guix.scm → .guix/modules/guile-package.scm └── .guix └── modules └── guile-package.scm
And that’s it: we have a channel! (We could do better and support
channel
authentication so users know they’re pulling genuine code. We’ll spare you
the details here but it’s worth considering!) Users can pull from this
channel by
adding
it to ~/.config/guix/channels.scm
, along these lines:
(append (list (channel
(name 'guile)
(url "https://git.savannah.gnu.org/git/guile.git")
(branch "main")))
%default-channels)
After running guix pull
, we can see the new package:
$ guix describe Generation 264 May 26 2023 16:00:35 (current) guile 36fd2b4 repository URL: https://git.savannah.gnu.org/git/guile.git branch: main commit: 36fd2b4920ae926c79b936c29e739e71a6dff2bc guix c5bc698 repository URL: https://git.savannah.gnu.org/git/guix.git commit: c5bc698e8922d78ed85989985cc2ceb034de2f23 $ guix package -A ^guile$ guile 3.0.99-git out,debug guile-package.scm:51:4 guile 3.0.9 out,debug gnu/packages/guile.scm:317:2 guile 2.2.7 out,debug gnu/packages/guile.scm:258:2 guile 2.2.4 out,debug gnu/packages/guile.scm:304:2 guile 2.0.14 out,debug gnu/packages/guile.scm:148:2 guile 1.8.8 out gnu/packages/guile.scm:77:2 $ guix build guile@3.0.99-git […] /gnu/store/axnzbl89yz7ld78bmx72vpqp802dwsar-guile-3.0.99-git-debug /gnu/store/r34gsij7f0glg2fbakcmmk0zn4v62s5w-guile-3.0.99-git
That’s how, as a developer, you get your software delivered directly into the hands of users! No intermediaries, yet no loss of transparency and provenance tracking.
With that in place, it also becomes trivial for anyone to create Docker
images, Deb/RPM packages, or a plain tarball with guix pack
(see Invoking guix pack in GNU Guix Reference Manual):
# How about a Docker image of our Guile snapshot? guix pack -f docker -S /bin=bin guile@3.0.99-git # And a relocatable RPM? guix pack -f rpm -R -S /bin=bin guile@3.0.99-git
Next: Level 3: Setting Up Continuous Integration, Previous: Level 2: The Repository as a Channel, Up: Programutveckling [Contents][Index]
We now have an actual channel, but it contains only one package (see Level 2: The Repository as a Channel). While we’re at it, we can define package variants (see Defining Package Variants in GNU Guix Reference Manual) in our guile-package.scm file, variants that we want to be able to test as Guile developers—similar to what we did above with transformation options. We can add them like so:
;; This is the ‘.guix/modules/guile-package.scm’ file. (define-module (guile-package) …) (define-public guile …) (define (package-with-configure-flags p flags) "Return P with FLAGS as additional 'configure' flags." (package/inherit p (arguments (substitute-keyword-arguments (package-arguments p) ((#:configure-flags original-flags #~(list)) #~(append #$original-flags #$flags)))))) (define-public guile-without-threads (package (inherit (package-with-configure-flags guile #~(list "--without-threads"))) (name "guile-without-threads"))) (define-public guile-without-networking (package (inherit (package-with-configure-flags guile #~(list "--disable-networking"))) (name "guile-without-networking"))) ;; Return the package object defined above at the end of the module. guile
We can build these variants as regular packages once we’ve pulled the channel. Alternatively, from a checkout of Guile, we can run a command like this one from the top level:
guix build -L $PWD/.guix/modules guile-without-threads
Next: Bonus: Build manifest, Previous: Bonus: Package Variants, Up: Programutveckling [Contents][Index]
The channel we defined above (see Level 2: The Repository as a Channel) becomes even more interesting once we set up continuous integration (CI). There are several ways to do that.
You can use one of the mainstream continuous integration tools, such as GitLab-CI. To do that, you need to make sure you run jobs in a Docker image or virtual machine that has Guix installed. If we were to do that in the case of Guile, we’d have a job that runs a shell command like this one:
guix build -L $PWD/.guix/modules guile@3.0.99-git
Doing this works great and has the advantage of being easy to achieve on your favorite CI platform.
That said, you’ll really get the most of it by using Cuirass, a CI tool designed for and tightly integrated with Guix. Using it is more work than using a hosted CI tool because you first need to set it up, but that setup phase is greatly simplified if you use its Guix System service (see Continuous Integration in GNU Guix Reference Manual). Going back to our example, we give Cuirass a spec file that goes like this:
;; Cuirass spec file to build all the packages of the ‘guile’ channel. (list (specification (name "guile") (build '(channels guile)) (channels (append (list (channel (name 'guile) (url "https://git.savannah.gnu.org/git/guile.git") (branch "main"))) %default-channels))))
It differs from what you’d do with other CI tools in two important ways:
guile
and
guix
. Indeed, our own guile
package depends on many packages
provided by the guix
channel—GCC, the GNU libc, libffi, and so
on. Changes to packages from the guix
channel can potentially
influence our guile
build and this is something we’d like to see as
soon as possible as Guile developers.
guile
channel transparently
get pre-built binaries! (see Substitutes in GNU Guix Reference
Manual, for background info on substitutes.)
From a developer’s viewpoint, the end result is this
status page listing
evaluations: each evaluation is a combination of commits of the
guix
and guile
channels providing a number of
jobs—one job per package defined in guile-package.scm times
the number of target architectures.
As for substitutes, they come for free! As an example, since our
guile
jobset is built on ci.guix.gnu.org, which runs guix
publish
(see Invoking guix publish in GNU Guix Reference Manual)
in addition to Cuirass, one automatically gets substitutes for guile
builds from ci.guix.gnu.org; no additional work is needed for that.
Next: Wrapping Up, Previous: Level 3: Setting Up Continuous Integration, Up: Programutveckling [Contents][Index]
The Cuirass spec above is convenient: it builds every package in our channel, which includes a few variants (see Level 3: Setting Up Continuous Integration). However, this might be insufficiently expressive in some cases: one might want specific cross-compilation jobs, transformations, Docker images, RPM/Deb packages, or even system tests.
To achieve that, you can write a manifest (see Writing Manifests in GNU Guix Reference Manual). The one we have for Guile has entries for the package variants we defined above, as well as additional variants and cross builds:
;; This is ‘.guix/manifest.scm’. (use-modules (guix) (guix profiles) (guile-package)) ;import our own package module (define* (package->manifest-entry* package system #:key target) "Return a manifest entry for PACKAGE on SYSTEM, optionally cross-compiled to TARGET." (manifest-entry (inherit (package->manifest-entry package)) (name (string-append (package-name package) "." system (if target (string-append "." target) ""))) (item (with-parameters ((%current-system system) (%current-target-system target)) package)))) (define native-builds (manifest (append (map (lambda (system) (package->manifest-entry* guile system)) '("x86_64-linux" "i686-linux" "aarch64-linux" "armhf-linux" "powerpc64le-linux")) (map (lambda (guile) (package->manifest-entry* guile "x86_64-linux")) (cons (package (inherit (package-with-c-toolchain guile `(("clang-toolchain" ,(specification->package "clang-toolchain"))))) (name "guile-clang")) (list guile-without-threads guile-without-networking guile-debug guile-strict-typing)))))) (define cross-builds (manifest (map (lambda (target) (package->manifest-entry* guile "x86_64-linux" #:target target)) '("i586-pc-gnu" "aarch64-linux-gnu" "riscv64-linux-gnu" "i686-w64-mingw32" "x86_64-linux-gnu")))) (concatenate-manifests (list native-builds cross-builds))
We won’t go into the details of this manifest; suffice to say that it provides additional flexibility. We now need to tell Cuirass to build this manifest, which is done with a spec slightly different from the previous one:
;; Cuirass spec file to build all the packages of the ‘guile’ channel. (list (specification (name "guile") (build '(manifest ".guix/manifest.scm")) (channels (append (list (channel (name 'guile) (url "https://git.savannah.gnu.org/git/guile.git") (branch "main"))) %default-channels))))
We changed the (build …)
part of the spec to '(manifest
".guix/manifest.scm")
so that it would pick our manifest, and that’s it!
Previous: Bonus: Build manifest, Up: Programutveckling [Contents][Index]
We picked Guile as the running example in this chapter and you can see the result here:
.guix-channel
;
.guix/modules/guile-package.scm
with the top-level guix.scm symlink;
.guix/manifest.scm
.
These days, repositories are commonly peppered with dot files for various
tools: .envrc
, .gitlab-ci.yml
, .github/workflows
,
Dockerfile
, .buildpacks
, Aptfile
,
requirements.txt
, and whatnot. It may sound like we’re proposing a
bunch of additional files, but in fact those files are expressive
enough to supersede most or all of those listed above.
Med några filer får vi stöd för:
guix shell
);
guix build
);
guix pack
).
This a nice (in our view!) unified tool set for reproducible software deployment, and an illustration of how you as a developer can benefit from it!
Next: Installing Guix on a Cluster, Previous: Programutveckling, Up: Kokbok för GNU Guix [Contents][Index]
Guix provides multiple tools to manage environment. This chapter demonstrate such utilities.
Up: Miljöhantering [Contents][Index]
Guix provides a ‘direnv’ package, which could extend shell after directory change. This tool could be used to prepare a pure Guix environment.
The following example provides a shell function for ~/.direnvrc file, which could be used from Guix Git repository in ~/src/guix/.envrc file to setup a build environment similar to described in see Building from Git in GNU Guix Reference Manual.
Create a ~/.direnvrc with a Bash code:
# Thanks <https://github.com/direnv/direnv/issues/73#issuecomment-152284914> export_function() { local name=$1 local alias_dir=$PWD/.direnv/aliases mkdir -p "$alias_dir" PATH_add "$alias_dir" local target="$alias_dir/$name" if declare -f "$name" >/dev/null; then echo "#!$SHELL" > "$target" declare -f "$name" >> "$target" 2>/dev/null # Notice that we add shell variables to the function trigger. echo "$name \$*" >> "$target" chmod +x "$target" fi } use_guix() { # Set GitHub token. export GUIX_GITHUB_TOKEN="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" # Unset 'GUIX_PACKAGE_PATH'. export GUIX_PACKAGE_PATH="" # Recreate a garbage collector root. gcroots="$HOME/.config/guix/gcroots" mkdir -p "$gcroots" gcroot="$gcroots/guix" if [ -L "$gcroot" ] then rm -v "$gcroot" fi # Miscellaneous packages. PACKAGES_MAINTENANCE=( direnv git git:send-email git-cal gnupg guile-colorized guile-readline less ncurses openssh xdot ) # Environment packages. PACKAGES=(help2man guile-sqlite3 guile-gcrypt) # Thanks <https://lists.gnu.org/archive/html/guix-devel/2016-09/msg00859.html> eval "$(guix shell --search-paths --root="$gcroot" --pure \ --development guix ${PACKAGES[@]} ${PACKAGES_MAINTENANCE[@]} "$@")" # Predefine configure flags. configure() { ./configure } export_function configure # Run make and optionally build something. build() { make -j 2 if [ $# -gt 0 ] then ./pre-inst-env guix build "$@" fi } export_function build # Predefine push Git command. push() { git push --set-upstream origin } export_function push clear # Clean up the screen. git-cal --author='Your Name' # Show contributions calendar. # Show commands help. echo " build build a package or just a project if no argument provided configure run ./configure with predefined parameters push push to upstream Git repository " }
Every project containing .envrc with a string use guix
will
have predefined environment variables and procedures.
Run direnv allow
to setup the environment for the first time.
Next: Acknowledgments, Previous: Miljöhantering, Up: Kokbok för GNU Guix [Contents][Index]
Guix is appealing to scientists and HPC (high-performance computing) practitioners: it makes it easy to deploy potentially complex software stacks, and it lets you do so in a reproducible fashion—you can redeploy the exact same software on different machines and at different points in time.
In this chapter we look at how a cluster sysadmin can install Guix for system-wide use, such that it can be used on all the cluster nodes, and discuss the various tradeoffs2.
Observera: Here we assume that the cluster is running a GNU/Linux distro other than Guix System and that we are going to install Guix on top of it.
Next: Setting Up Compute Nodes, Up: Installing Guix on a Cluster [Contents][Index]
The recommended approach is to set up one head node running
guix-daemon
and exporting /gnu/store over NFS to compute
nodes.
Remember that guix-daemon
is responsible for spawning build
processes and downloads on behalf of clients (see Invoking guix-daemon in GNU Guix Reference Manual), and more generally accessing
/gnu/store, which contains all the package binaries built by all the
users (see The Store in GNU Guix Reference Manual). “Client”
here refers to all the Guix commands that users see, such as guix
install
. On a cluster, these commands may be running on the compute nodes
and we’ll want them to talk to the head node’s guix-daemon
instance.
To begin with, the head node can be installed following the usual binary installation instructions (see Binary Installation in GNU Guix Reference Manual). Thanks to the installation script, this should be quick. Once installation is complete, we need to make some adjustments.
Since we want guix-daemon
to be reachable not just from the head node
but also from the compute nodes, we need to arrange so that it listens for
connections over TCP/IP. To do that, we’ll edit the systemd startup file
for guix-daemon
, /etc/systemd/system/guix-daemon.service,
and add a --listen
argument to the ExecStart
line so that it
looks something like this:
ExecStart=/var/guix/profiles/per-user/root/current-guix/bin/guix-daemon --build-users-group=guixbuild --listen=/var/guix/daemon-socket/socket --listen=0.0.0.0
For these changes to take effect, the service needs to be restarted:
systemctl daemon-reload systemctl restart guix-daemon
Observera: The
--listen=0.0.0.0
bit means thatguix-daemon
will process all incoming TCP connections on port 44146 (see Invoking guix-daemon in GNU Guix Reference Manual). This is usually fine in a cluster setup where the head node is reachable exclusively from the cluster’s local area network—you don’t want that to be exposed to the Internet!
The next step is to define our NFS exports in /etc/exports by adding something along these lines:
/gnu/store *(ro) /var/guix *(rw, async) /var/log/guix *(ro)
The /gnu/store directory can be exported read-only since only
guix-daemon
on the master node will ever modify it.
/var/guix contains user profiles as managed by guix
package
; thus, to allow users to install packages with guix package
,
this must be read-write.
Users can create as many profiles as they like in addition to the default
profile, ~/.guix-profile. For instance, guix package -p
~/dev/python-dev -i python
installs Python in a profile reachable from the
~/dev/python-dev
symlink. To make sure that this profile is
protected from garbage collection—i.e., that Python will not be removed
from /gnu/store while this profile exists—, home directories
should be mounted on the head node as well so that guix-daemon
knows
about these non-standard profiles and avoids collecting software they refer
to.
It may be a good idea to periodically remove unused bits from
/gnu/store by running guix gc
(see Invoking guix gc in GNU Guix Reference Manual). This can be done by adding a crontab
entry on the head node:
root@master# crontab -e
... with something like this:
# Every day at 5AM, run the garbage collector to make sure # at least 10 GB are free on /gnu/store. 0 5 * * 1 /usr/local/bin/guix gc -F10G
We’re done with the head node! Let’s look at compute nodes now.
Next: Nätverksåtkomst, Previous: Setting Up a Head Node, Up: Installing Guix on a Cluster [Contents][Index]
First of all, we need compute nodes to mount those NFS directories that the head node exports. This can be done by adding the following lines to /etc/fstab:
head-node:/gnu/store /gnu/store nfs defaults,_netdev,vers=3 0 0 head-node:/var/guix /var/guix nfs defaults,_netdev,vers=3 0 0 head-node:/var/log/guix /var/log/guix nfs defaults,_netdev,vers=3 0 0
... where head-node is the name or IP address of your head node. From there on, assuming the mount points exist, you should be able to mount each of these on the compute nodes.
Next, we need to provide a default guix
command that users can run
when they first connect to the cluster (eventually they will invoke
guix pull
, which will provide them with their “own”
guix
command). Similar to what the binary installation script did
on the head node, we’ll store that in /usr/local/bin:
mkdir -p /usr/local/bin ln -s /var/guix/profiles/per-user/root/current-guix/bin/guix \ /usr/local/bin/guix
We then need to tell guix
to talk to the daemon running on our master
node, by adding these lines to /etc/profile
:
GUIX_DAEMON_SOCKET="guix://head-node" export GUIX_DAEMON_SOCKET
To avoid warnings and make sure guix
uses the right locale, we need
to tell it to use locale data provided by Guix (see Application Setup in GNU Guix Reference Manual):
GUIX_LOCPATH=/var/guix/profiles/per-user/root/guix-profile/lib/locale export GUIX_LOCPATH # Here we must use a valid locale name. Try "ls $GUIX_LOCPATH/*" # to see what names can be used. LC_ALL=fr_FR.utf8 export LC_ALL
For convenience, guix package
automatically generates
~/.guix-profile/etc/profile, which defines all the environment
variables necessary to use the packages—PATH
,
C_INCLUDE_PATH
, PYTHONPATH
, etc. Likewise, guix
pull
does that under ~/.config/guix/current. Thus it’s a good idea
to source both from /etc/profile
:
for GUIX_PROFILE in "$HOME/.config/guix/current" "$HOME/.guix-profile" do if [ -f "$GUIX_PROFILE/etc/profile" ]; then . "$GUIX_PROFILE/etc/profile" fi done
Last but not least, Guix provides command-line completion notably for Bash
and zsh. In /etc/bashrc
, consider adding this line:
. /var/guix/profiles/per-user/root/current-guix/etc/bash_completion.d/guix
Voilà!
You can check that everything’s in place by logging in on a compute node and running:
guix install hello
The daemon on the head node should download pre-built binaries on your
behalf and unpack them in /gnu/store, and guix install
should create ~/.guix-profile containing the
~/.guix-profile/bin/hello command.
Next: Diskanvändning, Previous: Setting Up Compute Nodes, Up: Installing Guix on a Cluster [Contents][Index]
Guix kräver en nätverksåtkomst för att hämta källkod och förbyggda binärfiler. The good news is that only the head node needs that since compute nodes simply delegate to it.
It is customary for cluster nodes to have access at best to a white
list of hosts. Our head node needs at least ci.guix.gnu.org
in this
white list since this is where it gets pre-built binaries from by default,
for all the packages that are in Guix proper.
Incidentally, ci.guix.gnu.org
also serves as a
content-addressed mirror of the source code of those packages.
Consequently, it is sufficient to have only ci.guix.gnu.org
in
that white list.
Software packages maintained in a separate repository such as one of the
various HPC channels are of course
unavailable from ci.guix.gnu.org
. For these packages, you may want
to extend the white list such that source and pre-built binaries (assuming
this-party servers provide binaries for these packages) can be downloaded.
As a last resort, users can always download source on their workstation and
add it to the cluster’s /gnu/store, like this:
GUIX_DAEMON_SOCKET=ssh://compute-node.example.org \ guix download http://starpu.gforge.inria.fr/files/starpu-1.2.3/starpu-1.2.3.tar.gz
The above command downloads starpu-1.2.3.tar.gz
and sends it
to the cluster’s guix-daemon
instance over SSH.
Air-gapped clusters require more work. At the moment, our suggestion would
be to download all the necessary source code on a workstation running Guix.
For instance, using the --sources option of guix build
(see Invoking guix build in GNU Guix Reference Manual), the
example below downloads all the source code the openmpi
package
depends on:
$ guix build --sources=transitive openmpi … /gnu/store/xc17sm60fb8nxadc4qy0c7rqph499z8s-openmpi-1.10.7.tar.bz2 /gnu/store/s67jx92lpipy2nfj5cz818xv430n4b7w-gcc-5.4.0.tar.xz /gnu/store/npw9qh8a46lrxiwh9xwk0wpi3jlzmjnh-gmp-6.0.0a.tar.xz /gnu/store/hcz0f4wkdbsvsdky3c0vdvcawhdkyldb-mpfr-3.1.5.tar.xz /gnu/store/y9akh452n3p4w2v631nj0injx7y0d68x-mpc-1.0.3.tar.gz /gnu/store/6g5c35q8avfnzs3v14dzl54cmrvddjm2-glibc-2.25.tar.xz /gnu/store/p9k48dk3dvvk7gads7fk30xc2pxsd66z-hwloc-1.11.8.tar.bz2 /gnu/store/cry9lqidwfrfmgl0x389cs3syr15p13q-gcc-5.4.0.tar.xz /gnu/store/7ak0v3rzpqm2c5q1mp3v7cj0rxz0qakf-libfabric-1.4.1.tar.bz2 /gnu/store/vh8syjrsilnbfcf582qhmvpg1v3rampf-rdma-core-14.tar.gz …
(Ifall du undrar är det där mer än 320 MiB av komprimerad källkod.)
We can then make a big archive containing all of this (see Invoking guix archive in GNU Guix Reference Manual):
$ guix archive --export \ `guix build --sources=transitive openmpi` \ > openmpi-source-code.nar
… and we can eventually transfer that archive to the cluster on removable storage and unpack it there:
$ guix archive --import < openmpi-source-code.nar
This process has to be repeated every time new source code needs to be brought to the cluster.
As we write this, the research institutes involved in Guix-HPC do not have air-gapped clusters though. If you have experience with such setups, we would like to hear feedback and suggestions.
Next: Security Considerations, Previous: Nätverksåtkomst, Up: Installing Guix on a Cluster [Contents][Index]
A common concern of sysadmins’ is whether this is all going to eat a lot of disk space. If anything, if something is going to exhaust disk space, it’s going to be scientific data sets rather than compiled software—that’s our experience with almost ten years of Guix usage on HPC clusters. Nevertheless, it’s worth taking a look at how Guix contributes to disk usage.
First, having several versions or variants of a given package in
/gnu/store does not necessarily cost much, because
guix-daemon
implements deduplication of identical files, and
package variants are likely to have a number of common files.
As mentioned above, we recommend having a cron job to run guix gc
periodically, which removes unused software from
/gnu/store. However, there’s always a possibility that users will
keep lots of software in their profiles, or lots of old generations of their
profiles, which is “live” and cannot be deleted from the viewpoint of
guix gc
.
Lösningen till det här är för användarna att regelbundet ta bort gamla generationer av sina profiler. Exempelvis kommer följande kommando att ta bort generationer som är mer än två månader gamla:
guix package --delete-generations=2m
Dessutom är det en god idé att uppmuntra användare till att regelbundet uppgradera sina profiler, vilket kan reducera antalet varianter av en given programvara som lagras i /gnu/store:
guix pull guix upgrade
Som en sista utväg är det alltid möjligt för systemadministratörer att göra en del av det här på deras användares vägnar. Trots allt är en av Guix styrkor den frihet och kontroll över sin programmiljö som Guix skänker sina användare, därför rekommenderar vi starkt att lämna över kontrollen till användarna.
Previous: Diskanvändning, Up: Installing Guix on a Cluster [Contents][Index]
On an HPC cluster, Guix is typically used to manage scientific software.
Security-critical software such as the operating system kernel and system
services such as sshd
and the batch scheduler remain under control of
sysadmins.
Guix-projektet har en god vana av att tillhandahålla säkerhetsuppdateringar
i rättan tid (see Security Updates in GNU Guix Reference Manual).
För att få säkerhetsuppdateringar behöver användare köra guix pull &&
guix upgrade
.
Because Guix uniquely identifies software variants, it is easy to see if a vulnerable piece of software is in use. For instance, to check whether the glibc 2.25 variant without the mitigation patch against “Stack Clash”, one can check whether user profiles refer to it at all:
guix gc --referrers /gnu/store/…-glibc-2.25
Det här kommer att rapportera om profiler som refererar till den här specifika glibc-varianten existerar.
Next: GNU Free Documentation License, Previous: Installing Guix on a Cluster, Up: Kokbok för GNU Guix [Contents][Index]
Guix is based on the Nix package manager, which was designed and implemented by Eelco Dolstra, with contributions from other people (see the nix/AUTHORS file in Guix.) Nix pioneered functional package management, and promoted unprecedented features, such as transactional package upgrades and rollbacks, per-user profiles, and referentially transparent build processes. Without this work, Guix would not exist.
De Nix-baserade programdistributionerna Nixpkgs och NixOS har också varit en inspiration för Guix.
GNU Guix självt är ett kollektivt arbete med bidrag från åtskilliga människor. Se filen AUTHORS i Guix för mer information om dessa förtjusande människor. Filen THANKS listar alla personer som har hjälpt till med att rapportera fel, sköta om infrastrukturen, tillhandahålla konstverk och teman, komma med förslag med mera—tack ska ni ha!
Det här dokumentet innehåller anpassade delar från artiklar som tidigare har publicerats på Guix-bloggen på https://guix.gnu.org/blog och på bloggen Guix-HPC på https://hpc.guix.info/blog.
Next: Begreppslista, Previous: Acknowledgments, Up: Kokbok för GNU Guix [Contents][Index]
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Previous: GNU Free Documentation License, Up: Kokbok för GNU Guix [Contents][Index]
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This chapter is adapted from a blog post published in June 2023 on the Guix web site.
This chapter is adapted from a blog post published on the Guix-HPC web site in 2017.