desktop-client: fix desktop file exec_path for Nix build

desktop-client/app.py

@@ -74,7 +74,8 @@ def misc_generate_desktop() -> None:
     template_path = os.getenv("STREAMLINED_DESKTOP_TEMPLATE") or "./entry.desktop"
     with Path(template_path).open("r") as fh:
         temp = Template(fh.read())
-    print(temp.substitute(name="Entertainment Decider", exec_path=str(Path(__file__).resolve())))
+    exec_path = os.getenv("STREAMLINED_EXEC_PATH") or str(Path(__file__).resolve())
+    print(temp.substitute(name="Entertainment Decider", exec_path=exec_path))
 
 
 MISC_COMMANDS: Dict[str, Callable[..., None]] = {

desktop-client/package.nix

@@ -41,7 +41,7 @@ python3Packages.buildPythonPackage {
 
   postInstall = ''
     mkdir --parent $out/share/applications
-    STREAMLINED_DESKTOP_TEMPLATE=${./entry.desktop} $out/bin/${name} misc generate-desktop-file > $out/share/applications/${name}_uri.desktop
+    STREAMLINED_DESKTOP_TEMPLATE=${./entry.desktop} STREAMLINED_EXEC_PATH=$out/bin/${name} $out/bin/${name} misc generate-desktop-file > $out/share/applications/${name}_uri.desktop
   '';
 
   meta = {