149 lines
4.1 KiB
Nix
149 lines
4.1 KiB
Nix
{ lib
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, config
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, pkgs
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, ...
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}:
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{
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options.system-manager = {
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services = lib.mkOption {
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type = with lib.types; listOf str;
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default = [ ];
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};
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etcFiles = lib.mkOption {
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type = with lib.types; listOf str;
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default = [ ];
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};
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preActivationAssertions = lib.mkOption {
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type = with lib.types; attrsOf (submodule ({ name, ... }: {
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options = {
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enable = lib.mkEnableOption "the assertion";
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name = lib.mkOption {
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type = lib.types.str;
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default = name;
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};
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script = lib.mkOption {
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type = lib.types.str;
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};
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};
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}));
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default = { };
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};
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};
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config = {
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# Avoid some standard NixOS assertions
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boot = {
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loader.grub.enable = false;
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initrd.enable = false;
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};
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system.stateVersion = lib.mkDefault lib.trivial.release;
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assertions =
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lib.flip map config.system-manager.etcFiles
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(entry:
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{
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assertion = lib.hasAttr entry config.environment.etc;
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message = lib.concatStringsSep " " [
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"The entry ${entry} that was passed to system-manager.etcFiles"
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"is not present in environment.etc"
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];
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}
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) ++
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lib.flip map config.system-manager.services
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(entry:
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{
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assertion = lib.hasAttr entry config.systemd.services;
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message = lib.concatStringsSep " " [
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"The entry ${entry} that was passed to system-manager.services"
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"is not present in systemd.services"
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];
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}
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);
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system-manager.preActivationAssertions = {
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osVersion =
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let
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supportedIds = [ "nixos" "ubuntu" ];
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in
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{
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enable = true;
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script = ''
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source /etc/os-release
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${lib.concatStringsSep "\n" (lib.flip map supportedIds (supportedId: ''
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if [ $ID = "${supportedId}" ]; then
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exit 0
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fi
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''))}
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echo "This OS is not currently supported."
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echo "Supported OSs are: ${lib.concatStringsSep ", " supportedIds}"
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exit 1
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'';
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};
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};
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# Add the system directory for systemd
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system-manager.etcFiles = [ "systemd/system" ];
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environment.etc =
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let
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allowCollisions = false;
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enabledUnits =
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lib.filterAttrs
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(name: _: lib.elem
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name
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(map (name: "${name}.service") config.system-manager.services))
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config.systemd.units;
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in
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{
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"systemd/system".source = lib.mkForce (pkgs.runCommand "system-manager-units"
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{
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preferLocalBuild = true;
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allowSubstitutes = false;
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}
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''
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mkdir -p $out
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for i in ${toString (lib.mapAttrsToList (n: v: v.unit) enabledUnits)}; do
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fn=$(basename $i/*)
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if [ -e $out/$fn ]; then
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if [ "$(readlink -f $i/$fn)" = /dev/null ]; then
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ln -sfn /dev/null $out/$fn
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else
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${if allowCollisions then ''
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mkdir -p $out/$fn.d
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ln -s $i/$fn $out/$fn.d/overrides.conf
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'' else ''
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echo "Found multiple derivations configuring $fn!"
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exit 1
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''}
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fi
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else
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ln -fs $i/$fn $out/
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fi
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done
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${lib.concatStrings (
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lib.mapAttrsToList (name: unit:
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lib.concatMapStrings (name2: ''
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mkdir -p $out/'${name2}.wants'
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ln -sfn '../${name}' $out/'${name2}.wants'/
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'') (unit.wantedBy or [])
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) enabledUnits)}
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${lib.concatStrings (
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lib.mapAttrsToList (name: unit:
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lib.concatMapStrings (name2: ''
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mkdir -p $out/'${name2}.requires'
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ln -sfn '../${name}' $out/'${name2}.requires'/
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'') (unit.requiredBy or [])
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) enabledUnits)}
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''
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);
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};
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};
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}
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