Use temp folder to copy commandlet project

openpype/hosts/unreal/ue_workers.py

@@ -6,6 +6,8 @@ import subprocess
 from distutils import dir_util
 from pathlib import Path
 from typing import List, Union
+import tempfile
+from distutils.dir_util import copy_tree
 
 import openpype.hosts.unreal.lib as ue_lib
 
@@ -90,9 +92,20 @@ class UEProjectGenerationWorker(QtCore.QObject):
             ("Generating a new UE project ... 1 out of "
              f"{stage_count}"))
 
+        # Need to copy the commandlet project to a temporary folder where
+        # users don't need admin rights to write to.
+        cmdlet_tmp = tempfile.TemporaryDirectory()
+        cmdlet_filename = cmdlet_project.name
+        cmdlet_dir = cmdlet_project.parent.as_posix()
+        cmdlet_tmp_name = Path(cmdlet_tmp.name)
+        cmdlet_tmp_file = cmdlet_tmp_name.joinpath(cmdlet_filename)
+        copy_tree(
+            cmdlet_dir,
+            cmdlet_tmp_name.as_posix())
+
         commandlet_cmd = [
             f"{ue_editor_exe.as_posix()}",
-            f"{cmdlet_project.as_posix()}",
+            f"{cmdlet_tmp_file.as_posix()}",
             "-run=AyonGenerateProject",
             f"{project_file.resolve().as_posix()}",
         ]
@@ -111,6 +124,8 @@ class UEProjectGenerationWorker(QtCore.QObject):
         gen_process.stdout.close()
         return_code = gen_process.wait()
 
+        cmdlet_tmp.cleanup()
+
         if return_code and return_code != 0:
             msg = (
                 f"Failed to generate {self.project_name} "