lightdm: fix tmpfiles path

[eadwu]

Motivation for this change

Fixes the tmpfiles path

[/etc/tmpfiles.d/nixos.conf:5] Line references path below legacy directory /var/run/, updating /var/run/lightdm → /run/lightdm; please update the tmpfiles.d/ drop-in file accordingly.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Fits CONTRIBUTING.md.

---

[xeji]

Related to #46734 . cc @worldofpeace. /var/run is symlinked to /run anyway, but we should get rid of the annoying warning.

[Mic92]

@GrahamcOfBorg test lightdm

[GrahamcOfBorg]

No attempt on aarch64-linux (full log)

The following builds were skipped because they don't evaluate on aarch64-linux: tests.lightdm

Partial log (click to expand)

Cannot nix-instantiate `tests.lightdm' because:
error: attribute 'lightdm' in selection path 'tests.lightdm' not found

[GrahamcOfBorg]

No attempt on x86_64-linux (full log)

The following builds were skipped because they don't evaluate on x86_64-linux: tests.lightdm

Partial log (click to expand)

Cannot nix-instantiate `tests.lightdm' because:
error: attribute 'lightdm' in selection path 'tests.lightdm' not found

[xeji]

the lightdm test isn't part of release.nix ... but the gnome3 test uses lightdm
@GrahamcOfBorg test gnome3

[GrahamcOfBorg]

No attempt on aarch64-linux (full log)

The following builds were skipped because they don't evaluate on aarch64-linux: tests.gnome3

Partial log (click to expand)

a) For `nixos-rebuild` you can set
  { nixpkgs.config.allowUnsupportedSystem = true; }
in configuration.nix to override this.

b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowUnsupportedSystem = true; }
to ~/.config/nixpkgs/config.nix.

[GrahamcOfBorg]

Success on x86_64-linux (full log)

Attempted: tests.gnome3

Partial log (click to expand)

machine: exit status 1
syncing
machine: running command: sync
machine: exit status 0
test script finished in 53.95s
cleaning up
killing machine (pid 597)
vde_switch: EOF on stdin, cleaning up and exiting
vde_switch: Could not remove ctl dir '/build/vde1.ctl': Directory not empty
/nix/store/rvffy07ai4lpd080z9vkq70z2vggz4vs-vm-test-run-gnome3

[xeji]

the error affects 18.09, backported in d3905a3

[worldofpeace]

Just noticed this today, I think we need to do this too https://git.archlinux.org/svntogit/packages.git/tree/trunk/lightdm-default-config.patch?h=packages/lightdm#n16

[xeji]

Thanks! I'm not sure that patch can be applied as is to nixpkgs, we'll have to check these changes first.

[worldofpeace]

I mean just the change at line 16.