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The channel we defined above (veja 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 (veja Continuous Integration em 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! (veja Substitutes em 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
(veja Invoking guix publish em 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.
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