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systemd: add a name option to all systemd units

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This allows us to set things like dependencies in a way that we can
catch typos at eval time.
So instead of
```nix
systemd.services.foo.wants = [ "bar.service" ];
```
we can write
```nix
systemd.services.foo.wants = [ config.systemd.services.bar.name ];
```
which will throw an error if no such service has been defined.

Not all cases can be done like this (eg template services), but in a lot
of cases this will allow to avoid typos.

There is a matching option on the unit option
(`systemd.units."foo.service".name`) as well.
This commit is contained in:
r-vdp 2024-03-21 14:52:12 +01:00
parent b432281d97
commit 9258f57625
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8 changed files with 124 additions and 63 deletions
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16
nixos/modules/system/boot/systemd/initrd.nix
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@ -490,18 +490,18 @@ in {
targets.initrd.aliases = ["default.target"];
units =
mapAttrs' (n: v: nameValuePair "${n}.path" (pathToUnit n v)) cfg.paths
// mapAttrs' (n: v: nameValuePair "${n}.service" (serviceToUnit n v)) cfg.services
// mapAttrs' (n: v: nameValuePair "${n}.slice" (sliceToUnit n v)) cfg.slices
// mapAttrs' (n: v: nameValuePair "${n}.socket" (socketToUnit n v)) cfg.sockets
// mapAttrs' (n: v: nameValuePair "${n}.target" (targetToUnit n v)) cfg.targets
// mapAttrs' (n: v: nameValuePair "${n}.timer" (timerToUnit n v)) cfg.timers
mapAttrs' (n: v: nameValuePair "${n}.path" (pathToUnit v)) cfg.paths
// mapAttrs' (n: v: nameValuePair "${n}.service" (serviceToUnit v)) cfg.services
// mapAttrs' (n: v: nameValuePair "${n}.slice" (sliceToUnit v)) cfg.slices
// mapAttrs' (n: v: nameValuePair "${n}.socket" (socketToUnit v)) cfg.sockets
// mapAttrs' (n: v: nameValuePair "${n}.target" (targetToUnit v)) cfg.targets
// mapAttrs' (n: v: nameValuePair "${n}.timer" (timerToUnit v)) cfg.timers
// listToAttrs (map
(v: let n = escapeSystemdPath v.where;
in nameValuePair "${n}.mount" (mountToUnit n v)) cfg.mounts)
in nameValuePair "${n}.mount" (mountToUnit v)) cfg.mounts)
// listToAttrs (map
(v: let n = escapeSystemdPath v.where;
in nameValuePair "${n}.automount" (automountToUnit n v)) cfg.automounts);
in nameValuePair "${n}.automount" (automountToUnit v)) cfg.automounts);
# make sure all the /dev nodes are set up
services.systemd-tmpfiles-setup-dev.wantedBy = ["sysinit.target"];