feat(pkgs): package Olympus (Everest installer)

pkgs/default.nix

@@ -7,4 +7,6 @@ final: prev: {
     version = "unstable-2022-04-28";
     src = final.sources.kmscon.src;
   });
+
+  olympus = prev.callPackage ./olympus.nix { };
 }

pkgs/olympus.nix

@@ -0,0 +1,47 @@
+# Taken from https://github.com/VergeDX/config-nixpkgs/blob/899f13750c9c1795d455eeee9cb28d3aa74a0866/packages/gui/olympus.nix
+{ stdenv
+, fetchzip
+, unzip
+, makeDesktopItem
+, buildFHSUserEnv
+}:
+let
+  olympus = stdenv.mkDerivation rec {
+    pname = "olympus";
+    version = "2623";
+
+    # https://everestapi.github.io/
+    src = fetchzip {
+      url = "https://dev.azure.com/EverestAPI/Olympus/_apis/build/builds/${version}/artifacts?artifactName=linux.main&$format=zip#linux.main.zip";
+      hash = "sha256-wQWUNAA7ohQ7pCXhndvGlvwQBKisTYGhdKMJeXlv1qs=";
+    };
+
+    buildInputs = [ unzip ];
+    installPhase = ''
+      mkdir -p "$out/opt/olympus/"
+      mv dist.zip "$out/opt/olympus/" && cd "$out/opt/olympus/"
+      unzip dist.zip && rm dist.zip
+      mkdir $out && echo XDG_DATA_HOME=$out
+      echo y | XDG_DATA_HOME="$out/share/" bash install.sh
+      sed -i "/ldconfig/d" ./love && rm ./usr/lib/libSDL2-2.0.so.0
+      sed -i "s/Exec=.*/Exec=olympus %u/g" ../../share/applications/Olympus.desktop
+    '';
+  };
+in
+buildFHSUserEnv {
+  name = "olympus";
+  runScript = "${olympus}/opt/olympus/olympus";
+  targetPkgs = pkgs: [
+    pkgs.freetype
+    pkgs.zlib
+    pkgs.SDL2
+    pkgs.curl
+    pkgs.libpulseaudio
+    pkgs.gtk3
+    pkgs.glib
+  ];
+
+  # https://github.com/EverestAPI/Olympus/blob/main/lib-linux/olympus.desktop
+  # https://stackoverflow.com/questions/8822097/how-to-replace-a-whole-line-with-sed
+  extraInstallCommands = ''cp -r "${olympus}/share/" $out'';
+}