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systemd: expand functionality #52

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systemd: expand functionality #52

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0333301
Provide an implementation for systemd user units
aanderse Nov 10, 2023
655434d
Provide an implementation for systemd.packages option
aanderse Nov 10, 2023
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187 changes: 137 additions & 50 deletions nix/modules/systemd.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,70 @@ let

inherit (utils) systemdUtils;
systemd-lib = utils.systemdUtils.lib;

generateUnits = { allowCollisions ? true, type, units, packages ? cfg.packages }:
pkgs.runCommand "${type}-units"
{ preferLocalBuild = true;
allowSubstitutes = false;
} ''
mkdir -p $out

# Symlink all units provided listed in systemd.packages.
packages="${toString packages}"

# Filter duplicate directories
declare -A unique_packages
for k in $packages ; do unique_packages[$k]=1 ; done

for i in ''${!unique_packages[@]}; do
for fn in $i/etc/systemd/${type}/* $i/lib/systemd/${type}/*; do
if ! [[ "$fn" =~ .wants$ ]]; then
if [[ -d "$fn" ]]; then
targetDir="$out/$(basename "$fn")"
mkdir -p "$targetDir"
${pkgs.buildPackages.xorg.lndir}/bin/lndir "$fn" "$targetDir"
else
ln -s $fn $out/
fi
fi
done
done

for i in ${toString (lib.mapAttrsToList (n: v: v.unit) units)}; do
fn=$(basename $i/*)
if [ -e $out/$fn ]; then
if [ "$(readlink -f $i/$fn)" = /dev/null ]; then
ln -sfn /dev/null $out/$fn
else
${if allowCollisions then ''
mkdir -p $out/$fn.d
ln -s $i/$fn $out/$fn.d/overrides.conf
'' else ''
echo "Found multiple derivations configuring $fn!"
exit 1
''}
fi
else
ln -fs $i/$fn $out/
fi
done

${lib.concatStrings (
lib.mapAttrsToList (name: unit:
lib.concatMapStrings (name2: ''
mkdir -p $out/'${name2}.wants'
ln -sfn '../${name}' $out/'${name2}.wants'/
'') (unit.wantedBy or [])
) units)}

${lib.concatStrings (
lib.mapAttrsToList (name: unit:
lib.concatMapStrings (name2: ''
mkdir -p $out/'${name2}.requires'
ln -sfn '../${name}' $out/'${name2}.requires'/
'') (unit.requiredBy or [])
) units)}
'';
in
{
options.systemd = {
Expand Down Expand Up @@ -123,6 +187,50 @@ in
};
};

options.systemd.user = {
units = lib.mkOption {
description = lib.mdDoc "Definition of systemd per-user units.";
default = {};
type = systemdUtils.types.units;
};

paths = lib.mkOption {
default = {};
type = systemdUtils.types.paths;
description = lib.mdDoc "Definition of systemd per-user path units.";
};

services = lib.mkOption {
default = {};
type = systemdUtils.types.services;
description = lib.mdDoc "Definition of systemd per-user service units.";
};

slices = lib.mkOption {
default = {};
type = systemdUtils.types.slices;
description = lib.mdDoc "Definition of systemd per-user slice units.";
};

sockets = lib.mkOption {
default = {};
type = systemdUtils.types.sockets;
description = lib.mdDoc "Definition of systemd per-user socket units.";
};

targets = lib.mkOption {
default = {};
type = systemdUtils.types.targets;
description = lib.mdDoc "Definition of systemd per-user target units.";
};

timers = lib.mkOption {
default = {};
type = systemdUtils.types.timers;
description = lib.mdDoc "Definition of systemd per-user timer units.";
};
};

config = {
systemd = {
targets.system-manager = {
Expand Down Expand Up @@ -157,56 +265,35 @@ in
cfg.automounts);
};

environment.etc =
let
allowCollisions = false;

enabledUnits = lib.filterAttrs (_: unit: unit.enable) cfg.units;
in
{
"systemd/system".source = pkgs.runCommand "system-manager-units"
{
preferLocalBuild = true;
allowSubstitutes = false;
}
''
mkdir -p $out

for i in ${toString (lib.mapAttrsToList (n: v: v.unit) enabledUnits)}; do
fn=$(basename $i/*)
if [ -e $out/$fn ]; then
if [ "$(readlink -f $i/$fn)" = /dev/null ]; then
ln -sfn /dev/null $out/$fn
else
${if allowCollisions then ''
mkdir -p $out/$fn.d
ln -s $i/$fn $out/$fn.d/overrides.conf
'' else ''
echo "Found multiple derivations configuring $fn!"
exit 1
''}
fi
else
ln -fs $i/$fn $out/
fi
done

${lib.concatStrings (
lib.mapAttrsToList (name: unit:
lib.concatMapStrings (name2: ''
mkdir -p $out/'${name2}.wants'
ln -sfn '../${name}' $out/'${name2}.wants'/
'') (unit.wantedBy or [])
) enabledUnits)}

${lib.concatStrings (
lib.mapAttrsToList (name: unit:
lib.concatMapStrings (name2: ''
mkdir -p $out/'${name2}.requires'
ln -sfn '../${name}' $out/'${name2}.requires'/
'') (unit.requiredBy or [])
) enabledUnits)}
'';
systemd.user = {
timers =
lib.mapAttrs
(name: service:
{
wantedBy = [ "timers.target" ];
timerConfig.OnCalendar = service.startAt;
})
(lib.filterAttrs (name: service: service.enable && service.startAt != [ ]) cfg.user.services);

units =
lib.mapAttrs' (n: v: lib.nameValuePair "${n}.path" (systemd-lib.pathToUnit n v)) cfg.user.paths
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.service" (systemd-lib.serviceToUnit n v)) cfg.user.services
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.slice" (systemd-lib.sliceToUnit n v)) cfg.user.slices
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.socket" (systemd-lib.socketToUnit n v)) cfg.user.sockets
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.target" (systemd-lib.targetToUnit n v)) cfg.user.targets
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.timer" (systemd-lib.timerToUnit n v)) cfg.user.timers;
};

environment.etc = {
"systemd/system".source = generateUnits {
type = "system";
units = lib.filterAttrs (_: unit: unit.enable) cfg.units;
};

"systemd/user".source = generateUnits {
type = "user";
units = lib.filterAttrs (_: unit: unit.enable) cfg.user.units;
};
};
};
}