sddm has cmake in its runtime closure

[edolstra]

Issue description

On NixOS 17.03, the sddm in the system configuration with Plasma 5 enabled, has cmake and extra-cmake-modules in its runtime closure, which causes unnecessary bloat. This is because nixos/modules/services/x11/desktop-managers/plasma5.nix has:

      services.xserver.displayManager.sddm = {
        theme = "breeze";
        themes = [
          pkgs.extra-cmake-modules # for the setup-hook          

makeQtWrapper then causes the share directories of cmake and extra-cmake-modules to be added to the sddm wrapper script. (Automatically adding everything with a share directory to the wrapper seems pretty drastic BTW.)

@ttuegel

Technical details

• System: NixOS 17.03.git.5ea3986
• Nix version: 1.12pre5073_1cf4801

[ttuegel]

Automatically adding everything with a share directory to the wrapper seems pretty drastic BTW.

KDE upstream is slightly careless about implicit runtime dependencies. I spent hours trying to figure out which runtime dependencies needed to be in XDG_DATA_DIRS. By the way, you have to guess at this because SDDM doesn't log error messages. 🙄

Could we drop extra-cmake-modules? Probably. Can I answer that question for any of the other dependencies? Not a chance. So I nuked it from orbit. Guessing the correct XDG_DATA_DIRS setting would be a good project for a first-time contributor with a lot of free time.

At the moment, I'm trying to get rid of makeQtWrapper entirely. This problem may go away as a happy accident, but that won't help this release. I'm open to other suggestions.