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systemd service: add support for shutdown packages

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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.
This commit is contained in:
Nikolay Amiantov 2019-07-25 16:27:28 +03:00
parent fd405dab3e
commit a304fc5d75
1 changed files with 30 additions and 9 deletions
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39
nixos/modules/system/boot/systemd.nix
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@ -504,6 +504,23 @@ in
description = "Packages providing systemd generators.";
};
systemd.shutdown = mkOption {
type = types.attrsOf types.path;
default = {};
description = ''
Definition of systemd shutdown executables.
For each <literal>NAME = VALUE</literal> pair of the attrSet, a link is generated from
<literal>/etc/systemd/system-shutdown/NAME</literal> to <literal>VALUE</literal>.
'';
};
systemd.shutdownPackages = mkOption {
default = [];
type = types.listOf types.package;
example = literalExample "[ pkgs.mdadm ]";
description = "Packages providing systemd shutdown executables.";
};
systemd.defaultUnit = mkOption {
default = "multi-user.target";
type = types.str;
@ -761,18 +778,21 @@ in
environment.systemPackages = [ systemd ];
environment.etc = let
# generate contents for /etc/systemd/system-generators from
# systemd.generators and systemd.generatorPackages
generators = pkgs.runCommand "system-generators" {
# generate contents for /etc/systemd/system-${type} from attrset of links and packages
hooks = type: links: packages: pkgs.runCommand "system-${type}" {
preferLocalBuild = true;
packages = cfg.generatorPackages;
} ''
packages = packages;
} ''
set -e
mkdir -p $out
for package in $packages
do
ln -s $package/lib/systemd/system-generators/* $out/
done;
${concatStrings (mapAttrsToList (generator: target: "ln -s ${target} $out/${generator};\n") cfg.generators)}
for hook in $package/lib/systemd/system-${type}/*
do
ln -s $hook $out/
done
done
${concatStrings (mapAttrsToList (exec: target: "ln -s ${target} $out/${exec};\n") links)}
'';
in ({
"systemd/system".source = generateUnits "system" cfg.units upstreamSystemUnits upstreamSystemWants;
@ -834,7 +854,8 @@ in
${concatStringsSep "\n" cfg.tmpfiles.rules}
'';
"systemd/system-generators" = { source = generators; };
"systemd/system-generators" = { source = hooks "generators" cfg.generators cfg.generatorPackages; };
"systemd/system-shutdown" = { source = hooks "shutdown" cfg.shutdown cfg.shutdownPackages; };
});
services.dbus.enable = true;