Add ALVR packaging

pkgs/alvr/default.nix

@@ -0,0 +1,36 @@
+{
+  lib,
+  appimageTools,
+  fetchurl,
+}: let
+  pname = "alvr";
+  version = "20.5.0";
+  src = fetchurl {
+    url = "https://github.com/alvr-org/ALVR/releases/download/v${version}/ALVR-x86_64.AppImage";
+    hash = "sha256-shA93fK/F+PNRv+DCTfvN+tm0w/sj/yPEYc5ms2vHRk=";
+  };
+
+  appimageContents = appimageTools.extractType2 {inherit pname version src;};
+in
+  appimageTools.wrapType2 {
+    inherit pname version src;
+
+    extraInstallCommands = ''
+      mv $out/bin/${pname}-${version} $out/bin/${pname}
+
+      install -Dm444 ${appimageContents}/alvr.desktop -t $out/share/applications
+      substituteInPlace $out/share/applications/alvr.desktop \
+        --replace 'Exec=alvr_dashboard' 'Exec=${pname}'
+      cp -r ${appimageContents}/usr/share/icons $out/share
+    '';
+
+    meta = with lib; {
+      description = "Stream VR games from your PC to your headset via Wi-Fi";
+      homepage = "https://github.com/alvr-org/ALVR/";
+      changelog = "https://github.com/alvr-org/ALVR/releases/tag/v${version}";
+      license = licenses.mit;
+      mainProgram = "alvr";
+      maintainers = with maintainers; [passivelemon];
+      platforms = ["x86_64-linux"];
+    };
+  }

pkgs/default.nix

@@ -2,4 +2,5 @@
 # You can build them using 'nix build .#example'
 pkgs: {
   # example = pkgs.callPackage ./example { };
+  alvr = pkgs.callPackage ./alvr {};
 }