skypeforlinux: Add GSettings schemas

[zgrannan]

Motivation for this change

Attempting to upload an attachment in Skype causes it to crash, with the error:

No GSettings schemas are installed on the system

These changes should resolve that issue.

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.

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[jtojnar]

Try using wrapGAppsHook instead.

[zgrannan]

@jtojnar I tried adding wrapGAppsHook to nativeBuildInputs but the error still remained. It looks like the underlying reason is that wrapGAppsHook operates in the fixup phase, but the skypeforlinux executable is moved into $out/bin in postFixup, so it is never wrapped.

There are a couple ways I could see this being resolved:

1. Alllow passing an argument for extra executables to wrap in wrapGAppsHook
2. Extract the wrapping code in wrap-gapps-hook.sh to a seperate script, and call that from postFixup in this derivation
3. Ensure skypeforlinux is placed in $out/bin before the fixup phase (However I couldn't figure out a way to do this)

Or maybe there's some other simple way that I'm missing? I'd be happy to implement any option.

[jtojnar]

Yeah, I wanted to do 2. for a long time but never got to i wrap-gapps-hook.

You can still run wrapProgram $somefile "̈́''${gappsWrapperArgs[@]}" in postFixup manually, the gappsWrapperArgs array will be populated by then.

Alternately, you can move the symlink creation to installPhase, which I think is the right thing to do anyway.

[jtojnar]

Actually, gtk3 should not be needed.

[zgrannan]

I thought the same thing, but the error still appears on my machine if gtk3 is not in nativeBuildInputs.

Perhap's it's because I'm not using Gnome DE?

[jtojnar]

Weird. wrapGAppsHook should bring GTK already. Though if you need it here, move it to buildInputs. Just the hook is native.

[jtojnar]

Alright, you do not need gtk3 but glib’s setup hooks. Could you add it to nativeBuildInputs with a comment “for setup hook populating GSETTINGS_SCHEMAS_PATH”?

[jtojnar]

Also makeWrapper is not used.

[zgrannan]

@jtojnar Let me know if there is any other changes you think are necessary

[jtojnar]

Pushed to master as 3b2f3e5