prismlauncher: target final wrapper in instance shortcuts (#537642)

pkgs/by-name/pr/prismlauncher-unwrapped/package.nix

@@ -42,6 +42,12 @@ stdenv.mkDerivation (finalAttrs: {
     ln -s ${libnbtplusplus} source/libraries/libnbtplusplus
   '';
 
+  # Ensure that instance shortucts point to our final wrapper, rather than this unwrapped version
+  postPatch = ''
+    substituteInPlace launcher/minecraft/ShortcutUtils.cpp \
+      --replace-fail 'QApplication::applicationFilePath()' 'QProcessEnvironment::systemEnvironment().value("NIX_LAUNCHER_WRAPPER", "${placeholder "out"}/bin/prismlauncher")'
+  '';
+
   nativeBuildInputs = [
     cmake
     pkg-config

pkgs/by-name/pr/prismlauncher/package.nix

@@ -122,7 +122,10 @@ symlinkJoin {
       ++ additionalPrograms;
 
     in
-    [ "--prefix PRISMLAUNCHER_JAVA_PATHS : ${lib.makeSearchPath "bin/java" jdks}" ]
+    [
+      "--set NIX_LAUNCHER_WRAPPER ${placeholder "out"}/bin/prismlauncher"
+      "--prefix PRISMLAUNCHER_JAVA_PATHS : ${lib.makeSearchPath "bin/java" jdks}"
+    ]
     ++ lib.optionals stdenv.hostPlatform.isLinux [
       "--set LD_LIBRARY_PATH ${addDriverRunpath.driverLink}/lib:${lib.makeLibraryPath runtimeLibs}"
       "--prefix PATH : ${lib.makeBinPath runtimePrograms}"