light-locker (lockscreen for lightdm)

[obadz]

cc @wkennington
cc @lethalman (I suspect something like that might also fixed the "Switch user" button in gnome-screensaver)

[mention-bot]

By analyzing the blame information on this pull request, we identified @edolstra, @ocharles and @wkennington to be potential reviewers

[obadz]

the-cavalry/light-locker#66 (comment) explains a bit how light-locker works and why it's essential that we're able to run multiple X servers simultaneously.

[obadz]

Tip for those who want system-wide default to xscreensaver with ability to "switch user" without logging off:

      displayManager = {
        lightdm.enable = true;
        sessionCommands = ''
          ${pkgs.xorg.xrdb}/bin/xrdb -merge <(echo xscreensaver\*newLoginCommand: ${pkgs.lightdm}/bin/dm-tool switch-to-greeter)
          ${pkgs.xscreensaver}/bin/xscreensaver -no-splash &
          ${pkgs.xss-lock}/bin/xss-lock -- ${pkgs.xscreensaver}/bin/xscreensaver-command -lock &
        '';
      };

[ocharles]

It all looks good to me, I can't see anything that would break existing set ups. 👍

[obadz]

Rebased to fix merge conflicts

[obadz]

cc @TimoMeijer @spacefrogg @wkennington

[obadz]

@ocharles has reviewed this change (thanks @ocharles).
Unless there are any further concerns, could we merge this change?

[spacefrogg]

Looks good to me.

Could you please reformat the commit subject lines properly (see Nixpkgs manual)? Especially the latter is without much information.

[obadz]

@spacefrogg: is that better?

[spacefrogg]

Fine! Now you just have to catch the attention of somebody who has commit rights.

[ocharles]

Thanks!

[obadz]

Thanks Ollie!