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systemd: Add support for path units.

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This allows to define systemd.path(5) units, for example like this:

{
  systemd = let
    description = "Set Key Permissions for xyz.key";
  in {
    paths.set-key-perms = {
      inherit description;
      before = [ "network.target" ];
      wantedBy = [ "multi-user.target" ];
      pathConfig.PathChanged = "/run/keys/xyz.key";
    };

    services.set-key-perms = {
      inherit description;
      serviceConfig.Type = "oneshot";
      script = "chown myspecialkeyuser /run/keys/xyz.key";
    };
  };
}

The example here is actually useful in order to set permissions for the
NixOps keys target to ensure those permisisons aren't reset whenever the
key file is reuploaded.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This commit is contained in:
aszlig 2014-03-31 12:23:27 +02:00
parent 6167da54ea
commit 9d8a8126e9
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2 changed files with 34 additions and 0 deletions
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17
nixos/modules/system/boot/systemd-unit-options.nix
View file

@ -321,6 +321,23 @@ in rec {
};
pathOptions = unitOptions // {
pathConfig = mkOption {
default = {};
example = { PathChanged = "/some/path"; Unit = "changedpath.service"; };
type = types.attrsOf unitOption;
description = ''
Each attribute in this set specifies an option in the
<literal>[Path]</literal> section of the unit. See
<citerefentry><refentrytitle>systemd.path</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> for details.
'';
};
};
mountOptions = unitOptions // {
what = mkOption {

17
nixos/modules/system/boot/systemd.nix
View file

@ -304,6 +304,15 @@ let
'';
};
pathToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text = commonUnitText def +
''
[Path]
${attrsToSection def.pathConfig}
'';
};
mountToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text = commonUnitText def +
@ -472,6 +481,13 @@ in
description = "Definition of systemd timer units.";
};
systemd.paths = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ pathOptions unitConfig ];
description = "Definition of systemd path units.";
};
systemd.mounts = mkOption {
default = [];
type = types.listOf types.optionSet;
@ -657,6 +673,7 @@ in
// mapAttrs' (n: v: nameValuePair "${n}.service" (serviceToUnit n v)) cfg.services
// mapAttrs' (n: v: nameValuePair "${n}.socket" (socketToUnit n v)) cfg.sockets
// mapAttrs' (n: v: nameValuePair "${n}.timer" (timerToUnit n v)) cfg.timers
// mapAttrs' (n: v: nameValuePair "${n}.path" (pathToUnit n v)) cfg.paths
// listToAttrs (map
(v: let n = escapeSystemdPath v.where;
in nameValuePair "${n}.mount" (mountToUnit n v)) cfg.mounts)