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* guix/build-system/gnu.scm: add variable test-target
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-*- mode: org -*-
[[http://www.gnu.org/software/guix/][GNU Guix]] (IPA: /ɡiːks/) is a purely functional package manager, and
associated free software distribution, for the [[http://www.gnu.org/gnu/gnu.html][GNU system]]. In addition
to standard package management features, Guix supports transactional
upgrades and roll-backs, unprivileged package management, per-user
profiles, and garbage collection.
It provides [[http://www.gnu.org/software/guile/][Guile]] Scheme APIs, including a high-level embedded
domain-specific languages (EDSLs) to describe how packages are to be
built and composed.
A user-land free software distribution for GNU/Linux comes as part of
Guix is based on the [[http://nixos.org/nix/][Nix]] package manager.
GNU Guix currently depends on the following packages:
- [[http://gnu.org/software/guile/][GNU Guile 2.0.x]]
- [[http://gnupg.org/][GNU libgcrypt]]
Unless `--disable-daemon' was passed, the following packages are needed:
- [[http://sqlite.org/][SQLite 3]]
- [[http://gcc.gnu.org][GCC's g++]]
When `--disable-daemon' was passed, you instead need the following:
Optionally, packages from Nixpkgs may be transparently reused from Guix.
For this to work, you need to have a checkout of the Nixpkgs repository;
the `--with-nixpkgs' option allows you to let `configure' know where the
Nixpkgs checkout is.
When building Guix from a checkout, the following packages are also
- [[http://www.gnu.org/software/autoconf/][GNU Autoconf]]
- [[http://www.gnu.org/software/automake/][GNU Automake]]
- [[http://www.gnu.org/software/gettext/][GNU Gettext]]
The "autoreconf -vi" command can be used to generate the build system
infrastructure; it reports an error if an inappropriate version of the
above packages is being used.
* How It Works
Guix does the high-level preparation of a /derivation/. A derivation is
the promise of a build; it is stored as a text file under
=/nix/store/xxx.drv=. The (guix derivations) module provides the
`derivation' primitive, as well as higher-level wrappers such as
Guix does remote procedure calls (RPCs) to the Guix or Nix daemon (the
=guix-daemon= or =nix-daemon= command), which in turn performs builds
and accesses to the Nix store on its behalf. The RPCs are implemented
in the (guix store) module.
* Installing Guix as non-root
The Guix daemon allows software builds to be performed under alternate
user accounts, which are normally created specifically for this
purpose. For instance, you may have a pool of accounts in the
=guixbuild= group, and then you can instruct =guix-daemon= to use them
$ guix-daemon --build-users-group=guixbuild
However, unless it is run as root, =guix-daemon= cannot switch users.
In that case, it falls back to using a setuid-root helper program call
=nix-setuid-helper=. That program is not setuid-root by default when
you install it; instead you should run a command along these lines
(assuming Guix is installed under /usr/local):
# chown root.root /usr/local/libexec/nix-setuid-helper
# chmod 4755 /usr/local/libexec/nix-setuid-helper
GNU Guix is hosted at https://savannah.gnu.org/projects/guix/.
Please email <email@example.com> for bug reports or questions regarding
Guix and its distribution; email <firstname.lastname@example.org> for
general issues regarding the GNU system.
Join #guix on irc.freenode.net.
* Guix & Nix
GNU Guix is based on [[http://nixos.org/nix/][the Nix package manager]]. It implements the same
package deployment paradigm, and in fact it reuses some of its code.
Yet, different engineering decisions were made for Guix, as described
Nix is really two things: a package build tool, implemented by a library
and daemon, and a special-purpose programming language. GNU Guix relies
on the former, but uses Scheme as a replacement for the latter.
Using Scheme instead of a specific language allows us to get all the
features and tooling that come with Guile (compiler, debugger, REPL,
Unicode, libraries, etc.) And it means that we have a general-purpose
language, on top of which we can have embedded domain-specific languages
(EDSLs), such as the one used to define packages. This broadens what
can be done in package recipes themselves, and what can be done around them.
Technically, Guix makes remote procedure calls to the ‘nix-worker’
daemon to perform operations on the store. At the lowest level, Nix
“derivations” represent promises of a build, stored in ‘.drv’ files in
the store. Guix produces such derivations, which are then interpreted
by the daemon to perform the build. Thus, Guix derivations can use
derivations produced by Nix (and vice versa).
With Nix and the [[http://nixos.org/nixpkgs][Nixpkgs]] distribution, package composition happens at
the Nix language level, but builders are usually written in Bash.
Conversely, Guix encourages the use of Scheme for both package
composition and builders. Likewise, the core functionality of Nix is
written in C++ and Perl; Guix relies on some of the original C++ code,
but exposes all the API as Scheme.
* Related software
- [[http://nixos.org][Nix, Nixpkgs, and NixOS]], functional package manager and associated
software distribution, are the inspiration of Guix
- [[http://www.gnu.org/software/stow/][GNU Stow]] builds around the idea of one directory per prefix, and a
symlink tree to create user environments
- [[http://www.pvv.ntnu.no/~arnej/store/storedoc_6.html][STORE]] shares the same idea
- [[https://live.gnome.org/OSTree/][GNOME's OSTree]] allows bootable system images to be built from a
specified set of packages
- The [[http://www.gnu.org/s/gsrc/][GNU Source Release Collection]] (GSRC) is a user-land software
distribution; unlike Guix, it relies on core tools available on the