From ad277ea47e17e3073ba61af07284d1dff8d1601e Mon Sep 17 00:00:00 2001 From: Gabriel Arazas Date: Sun, 29 Oct 2023 14:44:03 +0800 Subject: nixos/guix: init --- nixos/modules/module-list.nix | 1 + nixos/modules/services/misc/guix/default.nix | 394 +++++++++++++++++++++++++++ 2 files changed, 395 insertions(+) create mode 100644 nixos/modules/services/misc/guix/default.nix (limited to 'nixos/modules') diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix index 7f708f6e57c7..88c0090013c7 100644 --- a/nixos/modules/module-list.nix +++ b/nixos/modules/module-list.nix @@ -683,6 +683,7 @@ ./services/misc/gollum.nix ./services/misc/gpsd.nix ./services/misc/greenclip.nix + ./services/misc/guix ./services/misc/headphones.nix ./services/misc/heisenbridge.nix ./services/misc/homepage-dashboard.nix diff --git a/nixos/modules/services/misc/guix/default.nix b/nixos/modules/services/misc/guix/default.nix new file mode 100644 index 000000000000..00e84dc74554 --- /dev/null +++ b/nixos/modules/services/misc/guix/default.nix @@ -0,0 +1,394 @@ +{ config, pkgs, lib, ... }: + +let + cfg = config.services.guix; + + package = cfg.package.override { inherit (cfg) stateDir storeDir; }; + + guixBuildUser = id: { + name = "guixbuilder${toString id}"; + group = cfg.group; + extraGroups = [ cfg.group ]; + createHome = false; + description = "Guix build user ${toString id}"; + isSystemUser = true; + }; + + guixBuildUsers = numberOfUsers: + builtins.listToAttrs (map + (user: { + name = user.name; + value = user; + }) + (builtins.genList guixBuildUser numberOfUsers)); + + # A set of Guix user profiles to be linked at activation. + guixUserProfiles = { + # The current Guix profile that is created through `guix pull`. + "current-guix" = "\${XDG_CONFIG_HOME}/guix/current"; + + # The default Guix profile similar to $HOME/.nix-profile from Nix. + "guix-profile" = "$HOME/.guix-profile"; + }; + + # All of the Guix profiles to be used. + guixProfiles = lib.attrValues guixUserProfiles; + + serviceEnv = { + GUIX_LOCPATH = "${cfg.stateDir}/guix/profiles/per-user/root/guix-profile/lib/locale"; + LC_ALL = "C.UTF-8"; + }; +in +{ + meta.maintainers = with lib.maintainers; [ foo-dogsquared ]; + + options.services.guix = with lib; { + enable = mkEnableOption "Guix build daemon service"; + + group = mkOption { + type = types.str; + default = "guixbuild"; + example = "guixbuild"; + description = '' + The group of the Guix build user pool. + ''; + }; + + nrBuildUsers = mkOption { + type = types.ints.unsigned; + description = '' + Number of Guix build users to be used in the build pool. + ''; + default = 10; + example = 20; + }; + + extraArgs = mkOption { + type = with types; listOf str; + default = [ ]; + example = [ "--max-jobs=4" "--debug" ]; + description = '' + Extra flags to pass to the Guix daemon service. + ''; + }; + + package = mkPackageOption pkgs "guix" { + extraDescription = '' + It should contain {command}`guix-daemon` and {command}`guix` + executable. + ''; + }; + + storeDir = mkOption { + type = types.path; + default = "/gnu/store"; + description = '' + The store directory where the Guix service will serve to/from. Take + note Guix cannot take advantage of substitutes if you set it something + other than {file}`/gnu/store` since most of the cached builds are + assumed to be in there. + + ::: {.warning} + This will also recompile all packages because the normal cache no + longer applies. + ::: + ''; + }; + + stateDir = mkOption { + type = types.path; + default = "/var"; + description = '' + The state directory where Guix service will store its data such as its + user-specific profiles, cache, and state files. + + ::: {.warning} + Changing it to something other than the default will rebuild the + package. + ::: + ''; + example = "/gnu/var"; + }; + + publish = { + enable = mkEnableOption "substitute server for your Guix store directory"; + + generateKeyPair = mkOption { + type = types.bool; + description = '' + Whether to generate signing keys in {file}`/etc/guix` which are + required to initialize a substitute server. Otherwise, + `--public-key=$FILE` and `--private-key=$FILE` can be passed in + {option}`services.guix.publish.extraArgs`. + ''; + default = true; + example = false; + }; + + port = mkOption { + type = types.port; + default = 8181; + example = 8200; + description = '' + Port of the substitute server to listen on. + ''; + }; + + user = mkOption { + type = types.str; + default = "guix-publish"; + description = '' + Name of the user to change once the server is up. + ''; + }; + + extraArgs = mkOption { + type = with types; listOf str; + description = '' + Extra flags to pass to the substitute server. + ''; + default = []; + example = [ + "--compression=zstd:6" + "--discover=no" + ]; + }; + }; + + gc = { + enable = mkEnableOption "automatic garbage collection service for Guix"; + + extraArgs = mkOption { + type = with types; listOf str; + default = [ ]; + description = '' + List of arguments to be passed to {command}`guix gc`. + + When given no option, it will try to collect all garbage which is + often inconvenient so it is recommended to set [some + options](https://guix.gnu.org/en/manual/en/html_node/Invoking-guix-gc.html). + ''; + example = [ + "--delete-generations=1m" + "--free-space=10G" + "--optimize" + ]; + }; + + dates = lib.mkOption { + type = types.str; + default = "03:15"; + example = "weekly"; + description = '' + How often the garbage collection occurs. This takes the time format + from {manpage}`systemd.time(7)`. + ''; + }; + }; + }; + + config = lib.mkIf cfg.enable (lib.mkMerge [ + { + environment.systemPackages = [ package ]; + + users.users = guixBuildUsers cfg.nrBuildUsers; + users.groups.${cfg.group} = { }; + + # Guix uses Avahi (through guile-avahi) both for the auto-discovering and + # advertising substitute servers in the local network. + services.avahi.enable = lib.mkDefault true; + services.avahi.publish.enable = lib.mkDefault true; + services.avahi.publish.userServices = lib.mkDefault true; + + # It's similar to Nix daemon so there's no question whether or not this + # should be sandboxed. + systemd.services.guix-daemon = { + environment = serviceEnv; + script = '' + ${lib.getExe' package "guix-daemon"} \ + --build-users-group=${cfg.group} \ + ${lib.escapeShellArgs cfg.extraArgs} + ''; + serviceConfig = { + OOMPolicy = "continue"; + RemainAfterExit = "yes"; + Restart = "always"; + TasksMax = 8192; + }; + unitConfig.RequiresMountsFor = [ + cfg.storeDir + cfg.stateDir + ]; + wantedBy = [ "multi-user.target" ]; + }; + + # This is based from Nix daemon socket unit from upstream Nix package. + # Guix build daemon has support for systemd-style socket activation. + systemd.sockets.guix-daemon = { + description = "Guix daemon socket"; + before = [ "multi-user.target" ]; + listenStreams = [ "${cfg.stateDir}/guix/daemon-socket/socket" ]; + unitConfig = { + RequiresMountsFor = [ + cfg.storeDir + cfg.stateDir + ]; + ConditionPathIsReadWrite = "${cfg.stateDir}/guix/daemon-socket"; + }; + wantedBy = [ "socket.target" ]; + }; + + systemd.mounts = [{ + description = "Guix read-only store directory"; + before = [ "guix-daemon.service" ]; + what = cfg.storeDir; + where = cfg.storeDir; + type = "none"; + options = "bind,ro"; + + unitConfig.DefaultDependencies = false; + wantedBy = [ "guix-daemon.service" ]; + }]; + + # Make transferring files from one store to another easier with the usual + # case being of most substitutes from the official Guix CI instance. + system.activationScripts.guix-authorize-keys = '' + for official_server_keys in ${package}/share/guix/*.pub; do + ${lib.getExe' package "guix"} archive --authorize < $official_server_keys + done + ''; + + # Link the usual Guix profiles to the home directory. This is useful in + # ephemeral setups where only certain part of the filesystem is + # persistent (e.g., "Erase my darlings"-type of setup). + system.userActivationScripts.guix-activate-user-profiles.text = let + linkProfileToPath = acc: profile: location: let + guixProfile = "${cfg.stateDir}/guix/profiles/per-user/\${USER}/${profile}"; + in acc + '' + [ -d "${guixProfile}" ] && ln -sf "${guixProfile}" "${location}" + ''; + + activationScript = lib.foldlAttrs linkProfileToPath "" guixUserProfiles; + in '' + # Don't export this please! It is only expected to be used for this + # activation script and nothing else. + XDG_CONFIG_HOME=''${XDG_CONFIG_HOME:-$HOME/.config} + + # Linking the usual Guix profiles into the home directory. + ${activationScript} + ''; + + # GUIX_LOCPATH is basically LOCPATH but for Guix libc which in turn used by + # virtually every Guix-built packages. This is so that Guix-installed + # applications wouldn't use incompatible locale data and not touch its host + # system. + environment.sessionVariables.GUIX_LOCPATH = lib.makeSearchPath "lib/locale" guixProfiles; + + # What Guix profiles export is very similar to Nix profiles so it is + # acceptable to list it here. Also, it is more likely that the user would + # want to use packages explicitly installed from Guix so we're putting it + # first. + environment.profiles = lib.mkBefore guixProfiles; + } + + (lib.mkIf cfg.publish.enable { + systemd.services.guix-publish = { + description = "Guix remote store"; + environment = serviceEnv; + + # Mounts will be required by the daemon service anyways so there's no + # need add RequiresMountsFor= or something similar. + requires = [ "guix-daemon.service" ]; + after = [ "guix-daemon.service" ]; + partOf = [ "guix-daemon.service" ]; + + preStart = lib.mkIf cfg.publish.generateKeyPair '' + # Generate the keypair if it's missing. + [ -f "/etc/guix/signing-key.sec" ] && [ -f "/etc/guix/signing-key.pub" ] || \ + ${lib.getExe' package "guix"} archive --generate-key || { + rm /etc/guix/signing-key.*; + ${lib.getExe' package "guix"} archive --generate-key; + } + ''; + script = '' + ${lib.getExe' package "guix"} publish \ + --user=${cfg.publish.user} --port=${builtins.toString cfg.publish.port} \ + ${lib.escapeShellArgs cfg.publish.extraArgs} + ''; + + serviceConfig = { + Restart = "always"; + RestartSec = 10; + + ProtectClock = true; + ProtectHostname = true; + ProtectKernelTunables = true; + ProtectKernelModules = true; + ProtectControlGroups = true; + SystemCallFilter = [ + "@system-service" + "@debug" + "@setuid" + ]; + + RestrictNamespaces = true; + RestrictAddressFamilies = [ + "AF_UNIX" + "AF_INET" + "AF_INET6" + ]; + + # While the permissions can be set, it is assumed to be taken by Guix + # daemon service which it has already done the setup. + ConfigurationDirectory = "guix"; + + AmbientCapabilities = [ "CAP_NET_BIND_SERVICE" ]; + CapabilityBoundingSet = [ + "CAP_NET_BIND_SERVICE" + "CAP_SETUID" + "CAP_SETGID" + ]; + }; + wantedBy = [ "multi-user.target" ]; + }; + + users.users.guix-publish = lib.mkIf (cfg.publish.user == "guix-publish") { + description = "Guix publish user"; + group = config.users.groups.guix-publish.name; + isSystemUser = true; + }; + users.groups.guix-publish = {}; + }) + + (lib.mkIf cfg.gc.enable { + # This service should be handled by root to collect all garbage by all + # users. + systemd.services.guix-gc = { + description = "Guix garbage collection"; + startAt = cfg.gc.dates; + script = '' + ${lib.getExe' package "guix"} gc ${lib.escapeShellArgs cfg.gc.extraArgs} + ''; + + serviceConfig = { + Type = "oneshot"; + + MemoryDenyWriteExecute = true; + PrivateDevices = true; + PrivateNetworks = true; + ProtectControlGroups = true; + ProtectHostname = true; + ProtectKernelTunables = true; + SystemCallFilter = [ + "@default" + "@file-system" + "@basic-io" + "@system-service" + ]; + }; + }; + + systemd.timers.guix-gc.timerConfig.Persistent = true; + }) + ]); +} -- cgit 1.4.1