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guix

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    Ludovic Courtès authored
    Partly fixes <http://bugs.gnu.org/20720>.
    Reported by Alex Kost <alezost@gmail.com>.
    
    * gnu/system.scm (default-/etc/hosts): Change 'text-file' to 'plain-file'.
      (maybe-file->monadic): New procedure.
      (operating-system-etc-directory): Use it.
    * doc/guix.texi (operating-system Reference, Networking Services): Adjust
      accordingly.
    24e02c28
    History
    -*- 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.
    
    Guix is based on the [[http://nixos.org/nix/][Nix]] package manager.
    
    
    * Requirements
    
    GNU Guix currently depends on the following packages:
    
      - [[http://gnu.org/software/guile/][GNU Guile 2.0.x]], version 2.0.7 or later
      - [[http://gnupg.org/][GNU libgcrypt]]
      - [[http://www.gnu.org/software/make/][GNU Make]]
      - optionally [[http://savannah.nongnu.org/projects/guile-json/][Guile-JSON]], for the 'guix import pypi' command
      - optionally [[http://www.gnutls.org][GnuTLS]] compiled with guile support enabled, for HTTPS support
        in the 'guix download' command.  Note that 'guix import pypi' requires
        this functionality.
    
    Unless `--disable-daemon' was passed, the following packages are needed:
    
      - [[http://sqlite.org/][SQLite 3]]
      - [[http://www.bzip.org][libbz2]]
      - [[http://gcc.gnu.org][GCC's g++]]
    
    When `--disable-daemon' was passed, you instead need the following:
    
      - [[http://nixos.org/nix/][Nix]]
    
    * Installation
    
    See the manual for the installation instructions, either by running
    
      info -f doc/guix.info "(guix) Installation"
    
    or by checking the [[http://www.gnu.org/software/guix/manual/guix.html#Installation][web copy of the manual]].
    
    For information on installation from a Git checkout, please see the ‘HACKING’
    file.
    
    * Installing Guix from Guix
    
    You can re-build and re-install Guix using a system that already runs Guix.
    To do so:
    
      - Start a shell with the development environment for Guix:
    
          guix environment guix
    
      - Re-run the 'configure' script passing it the option
        '--with-libgcrypt-prefix=$HOME/.guix-profile/', as well as
        '--localstatedir=/somewhere', where '/somewhere' is the 'localstatedir'
        value of the currently installed Guix (failing to do that would lead the
        new Guix to consider the store to be empty!).
    
      - Run "make", "make check", and "make install".
    
    * 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
    =/gnu/store/xxx.drv=.  The (guix derivations) module provides the
    `derivation' primitive, as well as higher-level wrappers such as
    `build-expression->derivation'.
    
    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
    like this:
    
      $ 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
    
    * Contact
    
    GNU Guix is hosted at https://savannah.gnu.org/projects/guix/.
    
    Please email <bug-guix@gnu.org> for bug reports or questions regarding
    Guix and its distribution; email <gnu-system-discuss@gnu.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
    below.
    
    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
        host system