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-= Running Guix on NixOS
-
-:install-step: https://www.gnu.org/software/guix/manual/en/html_node/Binary-Installation.html#Binary-Installation
-
-I wanted to run Guix on a NixOS machine.  Even though the Guix manual explains
-how to do it {install-step}[step by step], I needed a few extra ones to make it
-work properly.
-
-I couldn't just install GuixSD because my wireless network card doesn't have any
-free drivers (yet).
-
-== Creating `guixbuilder` users
-
-:manual: https://www.gnu.org/software/guix/manual/en/html_node/Build-Environment-Setup.html#Build-Environment-Setup
-
-Guix requires you to create non-root users that will be used to perform the
-builds in the isolated environments.
-
-The {manual}[manual] already provides you with a ready to run (as root) command
-for creating the build users:
-
-[source,sh]
-----
-groupadd --system guixbuild
-for i in `seq -w 1 10`;
-do
-  useradd -g guixbuild -G guixbuild           \
-          -d /var/empty -s `which nologin`    \
-          -c "Guix build user $i" --system    \
-          guixbuilder$i;
-done
-----
-
-:mutable-users: https://nixos.org/nixos/manual/index.html#sec-user-management
-
-However, In my personal NixOS I have disabled
-{mutable-users}[`users.mutableUsers`], which means that even if I run the above
-command it means that they'll be removed once I rebuild my OS:
-
-[source,sh]
-----
-$ sudo nixos-rebuild switch
-(...)
-removing user ‘guixbuilder7’
-removing user ‘guixbuilder3’
-removing user ‘guixbuilder10’
-removing user ‘guixbuilder1’
-removing user ‘guixbuilder6’
-removing user ‘guixbuilder9’
-removing user ‘guixbuilder4’
-removing user ‘guixbuilder2’
-removing user ‘guixbuilder8’
-removing user ‘guixbuilder5’
-(...)
-----
-
-Instead of enabling `users.mutableUsers` I could add the Guix users by adding
-them to my system configuration:
-
-[source,nix]
-----
-{ config, pkgs, ...}:
-
-{
-
-  # ... NixOS usual config ellided ...
-
-  users = {
-    mutableUsers = false;
-
-    extraUsers =
-      let
-        andrehUser =  {
-          andreh = {
-            # my custom user config
-          };
-        };
-        buildUser = (i:
-          {
-            "guixbuilder${i}" = {                   # guixbuilder$i
-              group = "guixbuild";                  # -g guixbuild
-              extraGroups = ["guixbuild"];          # -G guixbuild
-              home = "/var/empty";                  # -d /var/empty
-              shell = pkgs.nologin;                 # -s `which nologin`
-              description = "Guix build user ${i}"; # -c "Guix buid user $i"
-              isSystemUser = true;                  # --system
-            };
-          }
-        );
-      in
-        # merge all users
-        pkgs.lib.fold (str: acc: acc // buildUser str)
-                      andrehUser
-                      # for i in `seq -w 1 10`
-                      (map (pkgs.lib.fixedWidthNumber 2) (builtins.genList (n: n+1) 10));
-
-    extraGroups.guixbuild = {
-      name = "guixbuild";
-    };
-  };
-}
-----
-
-Here I used `fold` and the `//` operator to merge all of the configuration sets
-into a single `extraUsers` value.
-
-== Creating the `systemd` service
-
-:service-file: https://git.savannah.gnu.org/cgit/guix.git/tree/etc/guix-daemon.service.in?id=00c86a888488b16ce30634d3a3a9d871ed6734a2
-
-One other thing missing was the `systemd` service.
-
-First I couldn't just copy the `.service` file to `/etc` since in NixOS that
-folder isn't writable.  But also I wanted the service to be better integrated
-with the OS.
-
-That was a little easier than creating the users, all I had to do was translate
-the provided {service-file}[`guix-daemon.service.in`] configuration to an
-equivalent Nix expression:
-
-[source,ini]
-----
-# This is a "service unit file" for the systemd init system to launch
-# 'guix-daemon'.  Drop it in /etc/systemd/system or similar to have
-# 'guix-daemon' automatically started.
-
-[Unit]
-Description=Build daemon for GNU Guix
-
-[Service]
-ExecStart=/var/guix/profiles/per-user/root/guix-profile/bin/guix-daemon --build-users-group=guixbuild
-Environment=GUIX_LOCPATH=/root/.guix-profile/lib/locale
-RemainAfterExit=yes
-StandardOutput=syslog
-StandardError=syslog
-
-# See <https://lists.gnu.org/archive/html/guix-devel/2016-04/msg00608.html>.
-# Some package builds (for example, go@1.8.1) may require even more than
-# 1024 tasks.
-TasksMax=8192
-
-[Install]
-WantedBy=multi-user.target
-----
-
-This sample `systemd` configuration file became:
-
-[source,nix]
-----
-guix-daemon = {
-  enable = true;
-  description = "Build daemon for GNU Guix";
-  serviceConfig = {
-    ExecStart = "/var/guix/profiles/per-user/root/guix-profile/bin/guix-daemon --build-users-group=guixbuild";
-    Environment="GUIX_LOCPATH=/root/.guix-profile/lib/locale";
-    RemainAfterExit="yes";
-    StandardOutput="syslog";
-    StandardError="syslog";
-    TaskMax= "8192";
-  };
-  wantedBy = [ "multi-user.target" ];
-};
-----
-
-There you go!  After running `sudo nixos-rebuild switch` I could get Guix up and
-running:
-
-[source,sh]
-----
-$ guix package -i hello
-The following package will be installed:
-   hello        2.10    /gnu/store/bihfrh609gkxb9dp7n96wlpigiv3krfy-hello-2.10
-
-substitute: updating substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
-The following derivations will be built:
-   /gnu/store/nznmdn6inpwxnlkrasydmda4s2vsp9hg-profile.drv
-   /gnu/store/vibqrvw4c8lacxjrkqyzqsdrmckv77kq-fonts-dir.drv
-   /gnu/store/hi8alg7wi0wgfdi3rn8cpp37zhx8ykf3-info-dir.drv
-   /gnu/store/cvkbp378cvfjikz7mjymhrimv7j12p0i-ca-certificate-bundle.drv
-   /gnu/store/d62fvxymnp95rzahhmhf456bsf0xg1c6-manual-database.drv
-Creating manual page database...
-1 entries processed in 0.0 s
-2 packages in profile
-$ hello
-Hello, world!
-----
-
-:nixos-modules: https://nixos.org/nixos/manual/index.html#sec-writing-modules
-:req: https://www.gnu.org/software/guix/manual/en/html_node/Requirements.html#Requirements
-
-Some improvements to this approach are:
-
-. looking into {nixos-modules}[NixOS modules] and trying to bundle everything
-  together into a single logical unit;
-. {req}[build Guix from source] and share the Nix store and daemon with Guix.
-
-Happy Guix/Nix hacking!