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systemd: add support for upholds and upheldBy

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This commit is contained in:
Simonas Kazlauskas 2024-02-10 13:43:31 +02:00
parent db19b7f939
commit 74eeb75af1
2 changed files with 32 additions and 1 deletions
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10
nixos/lib/systemd-lib.nix
View file

@ -242,7 +242,7 @@ in rec {
ln -sfn '${name}' $out/'${name2}'
'') (unit.aliases or [])) units)}
# Create .wants and .requires symlinks from the wantedBy and
# Create .wants, .upholds and .requires symlinks from the wantedBy, upheldBy and
# requiredBy options.
${concatStrings (mapAttrsToList (name: unit:
concatMapStrings (name2: ''
@ -250,6 +250,12 @@ in rec {
ln -sfn '../${name}' $out/'${name2}.wants'/
'') (unit.wantedBy or [])) units)}
${concatStrings (mapAttrsToList (name: unit:
concatMapStrings (name2: ''
mkdir -p $out/'${name2}.upholds'
ln -sfn '../${name}' $out/'${name2}.upholds'/
'') (unit.upheldBy or [])) units)}
${concatStrings (mapAttrsToList (name: unit:
concatMapStrings (name2: ''
mkdir -p $out/'${name2}.requires'
@ -289,6 +295,8 @@ in rec {
{ Requires = toString config.requires; }
// optionalAttrs (config.wants != [])
{ Wants = toString config.wants; }
// optionalAttrs (config.upholds != [])
{ Upholds = toString config.upholds; }
// optionalAttrs (config.after != [])
{ After = toString config.after; }
// optionalAttrs (config.before != [])

23
nixos/lib/systemd-unit-options.nix
View file

@ -74,6 +74,15 @@ in rec {
'';
};
upheldBy = mkOption {
default = [];
type = types.listOf unitNameType;
description = lib.mdDoc ''
Keep this unit running as long as the listed units are running. This is a continuously
enforced version of wantedBy.
'';
};
wantedBy = mkOption {
default = [];
type = types.listOf unitNameType;
@ -147,6 +156,20 @@ in rec {
'';
};
upholds = mkOption {
default = [];
type = types.listOf unitNameType;
description = lib.mdDoc ''
Configures dependencies similar to Wants=, but as long as this unit is up, all units
listed in Upholds= are started whenever found to be inactive or failed, and no job is
queued for them. While a Wants= dependency on another unit has a one-time effect when
this units started, a Upholds= dependency on it has a continuous effect, constantly
restarting the unit if necessary. This is an alternative to the Restart= setting of
service units, to ensure they are kept running whatever happens. The restart happens
without delay, and usual per-unit rate-limit applies.
'';
};
after = mkOption {
default = [];
type = types.listOf unitNameType;