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systemd: Enable specifying extra config files for a unit

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This will allow overriding package-provided units, or overriding only a
specific instance of a unit template.

Signed-off-by: Shea Levy <shea@shealevy.com>
This commit is contained in:
Shea Levy 2014-01-18 11:10:39 -05:00
parent 84f35a7cc1
commit ca7805be94
1 changed files with 19 additions and 4 deletions
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23
nixos/modules/system/boot/systemd.nix
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@ -11,16 +11,19 @@ let
systemd = cfg.package; systemd = cfg.package;
makeUnit = name: unit: makeUnit = name: unit:
pkgs.runCommand "unit" ({ preferLocalBuild = true; } // optionalAttrs (unit.linkTarget == null) { inherit (unit) text; }) pkgs.runCommand "unit" { preferLocalBuild = true; inherit (unit) text; }
(if !unit.enable then '' ((if !unit.enable then ''
mkdir -p $out mkdir -p $out
ln -s /dev/null $out/${name} ln -s /dev/null $out/${name}
'' else if unit.linkTarget != null then '' '' else if unit.linkTarget != null then ''
mkdir -p $out mkdir -p $out
ln -s ${unit.linkTarget} $out/${name} ln -s ${unit.linkTarget} $out/${name}
'' else '' '' else if unit.text != null then ''
mkdir -p $out mkdir -p $out
echo -n "$text" > $out/${name} echo -n "$text" > $out/${name}
'' else "") + optionalString (unit.extraConfig != {}) ''
mkdir -p $out/${name}.d
${concatStringsSep "\n" (mapAttrsToList (n: v: "echo -n \"${v}\" > $out/${name}.d/${n}") unit.extraConfig)}
''); '');
upstreamUnits = upstreamUnits =
@ -392,7 +395,8 @@ in
options = { name, config, ... }: options = { name, config, ... }:
{ options = { { options = {
text = mkOption { text = mkOption {
type = types.str; type = types.nullOr types.str;
default = null;
description = "Text of this systemd unit."; description = "Text of this systemd unit.";
}; };
enable = mkOption { enable = mkOption {
@ -424,6 +428,17 @@ in
description = "The file to symlink this target to."; description = "The file to symlink this target to.";
type = types.nullOr types.path; type = types.nullOr types.path;
}; };
extraConfig = mkOption {
default = {};
example = { "foo@1.conf" = "X-RestartIfChanged=false"; };
type = types.attrsOf types.lines;
description = ''
Extra files to be appended to the configuration for the unit.
This can be used to override configuration for a unit provided
by systemd or another package, or to override only a single instance
of a template unit.
'';
};
}; };
config = { config = {
unit = makeUnit name config; unit = makeUnit name config;