systemd service: add support for shutdown packages
Shutdown hooks are executed right before the shutdown, which is useful for some applications. Among other things this is needed for mdadm hook to run.
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@ -504,6 +504,23 @@ in
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description = "Packages providing systemd generators.";
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};
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systemd.shutdown = mkOption {
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type = types.attrsOf types.path;
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default = {};
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description = ''
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Definition of systemd shutdown executables.
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For each <literal>NAME = VALUE</literal> pair of the attrSet, a link is generated from
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<literal>/etc/systemd/system-shutdown/NAME</literal> to <literal>VALUE</literal>.
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'';
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};
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systemd.shutdownPackages = mkOption {
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default = [];
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type = types.listOf types.package;
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example = literalExample "[ pkgs.mdadm ]";
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description = "Packages providing systemd shutdown executables.";
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};
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systemd.defaultUnit = mkOption {
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default = "multi-user.target";
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type = types.str;
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@ -761,18 +778,21 @@ in
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environment.systemPackages = [ systemd ];
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environment.etc = let
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# generate contents for /etc/systemd/system-generators from
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# systemd.generators and systemd.generatorPackages
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generators = pkgs.runCommand "system-generators" {
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# generate contents for /etc/systemd/system-${type} from attrset of links and packages
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hooks = type: links: packages: pkgs.runCommand "system-${type}" {
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preferLocalBuild = true;
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packages = cfg.generatorPackages;
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} ''
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packages = packages;
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} ''
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set -e
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mkdir -p $out
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for package in $packages
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do
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ln -s $package/lib/systemd/system-generators/* $out/
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done;
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${concatStrings (mapAttrsToList (generator: target: "ln -s ${target} $out/${generator};\n") cfg.generators)}
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for hook in $package/lib/systemd/system-${type}/*
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do
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ln -s $hook $out/
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done
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done
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${concatStrings (mapAttrsToList (exec: target: "ln -s ${target} $out/${exec};\n") links)}
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'';
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in ({
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"systemd/system".source = generateUnits "system" cfg.units upstreamSystemUnits upstreamSystemWants;
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@ -834,7 +854,8 @@ in
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${concatStringsSep "\n" cfg.tmpfiles.rules}
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'';
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"systemd/system-generators" = { source = generators; };
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"systemd/system-generators" = { source = hooks "generators" cfg.generators cfg.generatorPackages; };
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"systemd/system-shutdown" = { source = hooks "shutdown" cfg.shutdown cfg.shutdownPackages; };
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});
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services.dbus.enable = true;
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