appimageTools: init

[tilpner]

Motivation for this change

The appimageTools attrset contains utilities to prevent
the usage of appimage-run to package AppImages, like done/attempted
in #49370 and #53156.

This has the advantage of allowing for per-package environment changes,
and extracts into the store instead of the users home directory.

The package list was extracted into appimageTools to prevent
duplication.

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)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

---

[tilpner]

Tested with Etcher (Type1) and Patchwork (Type2), but not far beyond "it runs and looks okay". Please try on AppImages you use and report any issues.

@joepie91 @fusion809 @tycho01 @pinage404

[cocreature]

Tested on bitwarden and it worked just fine so 👍

[fusion809]

I'd love to try this PR out, it's just I don't know how to, as I am still pretty inexperienced with Nix. I tried adding my clone of your fork, checked out to appimage-tool, to my overlays.nix file (which looks like https://gist.github.com/437e361011def183f124f7eb00042643) but running nix-env -f '<nixos-unstable>' -iA appimageTools produces no output. Is this something to add to packages = [ ... ]; under my user account in /etc/nixos/configuration.nix, or?

[tilpner]

@fusion809 appimageTools is meant to be used to package/wrap an AppImage file, so you'd use it from a Nix file, not nix-env. See #54696 for an example of how it can be used. Such an expression could live in nixpkgs, or in your overlay, and the result could then be installed as usual (nix-env, configuration.nix, etc.).

[pinage404]

I read the code, I didn't understand everything (I'm still a noob with Nix)

I don't know how to use it, because:

• I'm not a package developer (for the moment), so the way to do it is still unclear to me
• I don't know how to use the code of this repo when it is not yet merged and therefore available in the unstable channel

[tilpner]

@pinage404 You can use the standardnotes PR referenced above as an example. You would have to copy appimageTools to your machine manually, or work from my nixpkgs branch.

(I will do docs Soon™)

[nixos-discourse]

This pull request has been mentioned on Nix community. There might be relevant details there:

https://discourse.nixos.org/t/nixos-19-03-feature-freeze/1950/34