isle/nix/appimagetool.nix

{ stdenv, fetchurl }:

let

  version = "765";

  cpuArch = stdenv.buildPlatform.parsed.cpu.name;

  srcDir = ./go-appimage;

  # https://github.com/probonopd/go-appimage
  # The author of go-appimage has set up some crazy continuous integration build
  # system with github, which is really cool, except that it doesn't preserve
  # any older builds of the project. And it's pretty difficult to build it
  # ourselves. So fuck it, just embed a tarball into the repo.
  src = {
    "x86_64" = "${srcDir}/appimagetool-${version}-x86_64.AppImage";
    "aarch64" = "${srcDir}/go-appimage/appimagetool-${version}-aarch64.AppImage";
    "armv7l" = "${srcDir}/go-appimage/appimagetool-${version}-armhf.AppImage";
    "i686" = "${srcDir}/go-appimage/appimagetool-${version}-i686.AppImage";
  }."${cpuArch}";

in stdenv.mkDerivation rec {

  pname = "go-appimage";
  inherit version src;
  sourceRoot = "squashfs-root";

  unpackPhase = ''
    cp $src appimagetool
    chmod u+wx appimagetool
    ./appimagetool --appimage-extract
  '';

  installPhase = ''
    mkdir -p $out
    cp -r usr/* $out
  '';
}