Setting the icon with an absolute path is going to break custom icons in themes.

Ah damn, it currently only works like this in ChromeOs.

I believe the Slack package we use the default pixmap.

https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/instant-messengers/slack/default.nix#L91

I'm not sure if this is just something that was missed though.
If this is the case, then I may start a downstream library with the desktopfiles patched to work in Crostini.

Yeah, icon is not supposed to be a full path but many places do that anyway. You should be able to add the /share directory to XDG_DATA_DIRS. Here's someone who looks like they got it to work:

https://www.reddit.com/r/Crostini/comments/9lazhn/environment_variables_for_launcher_applications/e769u4y/

As an aside, it would be great to have someone document using Nixpkgs with Crostini on the wiki: https://nixos.wiki

@matthewbauer I agree, I think it's a good idea to put some docs up regarding running Nix in Crostini. I have put up a very quick page (something that can be worked on and refined as things progress).

I think I need to spend some more time figuring out where Crostini is going with image recognition as there are a few limitations I have come across in this process.

• only supports .png
• can only pick up images in the pixmaps directory (ie. vlc/xterm not supported)
• links to executables should be absolute (although this now works if using the above reddit advice).

I'm not sure what the correct course of action here is, I understand the want for custom themes, so don't want to rule that out, I will play around more with it, and see if I can create a better user-story for using Nix within Crostini (it's already pretty decent tbh).

Link: https://nixos.wiki/wiki/Installing_on_Crostini