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Major overhaul of the nix side of things, part II.

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r-vdp 2023-03-24 16:03:20 +01:00
parent 9759c2da12
commit ce4cf7149d
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7 changed files with 371 additions and 303 deletions
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178
nix/modules/systemd.nix
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@ -6,13 +6,31 @@
}:
let
cfg = config.system-manager.systemd;
cfg = config.systemd;
inherit (utils) systemdUtils;
systemd-lib = utils.systemdUtils.lib;
in
{
options.system-manager.systemd = {
options.systemd = {
# TODO: this is a bit dirty.
# The value here gets added to the PATH of every service.
# We could consider copying the systemd lib from NixOS and removing the bits
# that are not relevant to us, like this option.
package = lib.mkOption {
type = lib.types.oneOf [ lib.types.str lib.types.path lib.types.package ];
default = pkgs.systemdMinimal;
};
globalEnvironment = lib.mkOption {
type = with lib.types; attrsOf (nullOr (oneOf [ str path package ]));
default = { };
example = { TZ = "CET"; };
description = lib.mdDoc ''
Environment variables passed to *all* systemd units.
'';
};
units = lib.mkOption {
description = lib.mdDoc "Definition of systemd units.";
@ -106,87 +124,85 @@ in
};
config = {
system-manager = {
systemd = {
timers =
lib.mapAttrs
(name: service:
{
wantedBy = [ "timers.target" ];
timerConfig.OnCalendar = service.startAt;
})
(lib.filterAttrs (name: service: service.enable && service.startAt != [ ]) cfg.services);
units =
lib.mapAttrs' (n: v: lib.nameValuePair "${n}.path" (systemd-lib.pathToUnit n v)) cfg.paths
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.service" (systemd-lib.serviceToUnit n v)) cfg.services
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.slice" (systemd-lib.sliceToUnit n v)) cfg.slices
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.socket" (systemd-lib.socketToUnit n v)) cfg.sockets
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.target" (systemd-lib.targetToUnit n v)) cfg.targets
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.timer" (systemd-lib.timerToUnit n v)) cfg.timers
// lib.listToAttrs (map
(v:
let n = utils.escapeSystemdPath v.where;
in lib.nameValuePair "${n}.mount" (systemd-lib.mountToUnit n v))
cfg.mounts)
// lib.listToAttrs (map
(v:
let n = utils.escapeSystemdPath v.where;
in lib.nameValuePair "${n}.automount" (systemd-lib.automountToUnit n v))
cfg.automounts);
};
environment.etc =
let
allowCollisions = false;
enabledUnits = cfg.units;
in
{
"systemd/system".source = pkgs.runCommand "system-manager-units"
systemd = {
timers =
lib.mapAttrs
(name: service:
{
preferLocalBuild = true;
allowSubstitutes = false;
}
''
mkdir -p $out
wantedBy = [ "timers.target" ];
timerConfig.OnCalendar = service.startAt;
})
(lib.filterAttrs (name: service: service.enable && service.startAt != [ ]) cfg.services);
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)}
'';
};
units =
lib.mapAttrs' (n: v: lib.nameValuePair "${n}.path" (systemd-lib.pathToUnit n v)) cfg.paths
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.service" (systemd-lib.serviceToUnit n v)) cfg.services
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.slice" (systemd-lib.sliceToUnit n v)) cfg.slices
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.socket" (systemd-lib.socketToUnit n v)) cfg.sockets
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.target" (systemd-lib.targetToUnit n v)) cfg.targets
// lib.mapAttrs' (n: v: lib.nameValuePair "${n}.timer" (systemd-lib.timerToUnit n v)) cfg.timers
// lib.listToAttrs (map
(v:
let n = utils.escapeSystemdPath v.where;
in lib.nameValuePair "${n}.mount" (systemd-lib.mountToUnit n v))
cfg.mounts)
// lib.listToAttrs (map
(v:
let n = utils.escapeSystemdPath v.where;
in lib.nameValuePair "${n}.automount" (systemd-lib.automountToUnit n v))
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)}
'';
};
};
}