From a programming viewpoint, the package definitions of the
GNU distribution are provided by Guile modules in the
…) name space19 (see Guile modules in GNU Guile
Reference Manual). For instance, the
(gnu packages emacs)
module exports a variable named
emacs, which is bound to a
<package> object (see Defining Packages).
(gnu packages …) module name space is
automatically scanned for packages by the command-line tools. For
instance, when running
guix install emacs, all the
packages …) modules are scanned until one that exports a package
object whose name is
emacs is found. This package search
facility is implemented in the
(gnu packages) module.
Users can store package definitions in modules with different
(my-packages emacs)20. There are two ways to make
these package definitions visible to the user interfaces:
guix packageand other commands (see Common Build Options), or by setting the
GUIX_PACKAGE_PATHenvironment variable described below.
guix pullso that it pulls from it. A channel is essentially a Git repository containing package modules. See Channels, for more information on how to define and use channels.
GUIX_PACKAGE_PATH works similarly to other search path variables:
This is a colon-separated list of directories to search for additional package modules. Directories listed in this variable take precedence over the own modules of the distribution.
The distribution is fully bootstrapped and self-contained:
each package is built based solely on other packages in the
distribution. The root of this dependency graph is a small set of
bootstrap binaries, provided by the
bootstrap) module. For more information on bootstrapping,
Note that packages under the
packages …) module name space are not necessarily “GNU
packages”. This module naming scheme follows the usual Guile module
gnu means that these modules are distributed
as part of the GNU system, and
packages identifies modules that
Note that the file
name and module name must match. For instance, the
emacs) module must be stored in a my-packages/emacs.scm file
relative to the load path specified with --load-path or
GUIX_PACKAGE_PATH. See Modules and the File System in GNU Guile Reference Manual, for details.