diff '--exclude=*.swp' -Naur jupyterlab-1.2.6.orig/jupyterlab/commands.py jupyterlab-1.2.6/jupyterlab/commands.py
--- jupyterlab-1.2.6.orig/jupyterlab/commands.py	2020-01-24 17:25:16.238353500 +0100
+++ jupyterlab-1.2.6/jupyterlab/commands.py	2020-01-31 12:36:10.497375982 +0100
@@ -1100,7 +1100,7 @@
                       'webpack.prod.minimize.config.js',
                       '.yarnrc', 'yarn.js']:
             target = pjoin(staging, fname)
-            shutil.copy(pjoin(HERE, 'staging', fname), target)
+            shutil.copyfile(pjoin(HERE, 'staging', fname), target)
 
         # Ensure a clean templates directory
         templates = pjoin(staging, 'templates')
@@ -1108,7 +1108,10 @@
             _rmtree(templates, self.logger)
 
         try:
-            shutil.copytree(pjoin(HERE, 'staging', 'templates'), templates)
+            shutil.copytree(pjoin(HERE, 'staging', 'templates'), templates,
+                    copy_function=shutil.copyfile)
+            # cannot replace or disable copytree’s call to .copystat
+            os.chmod (templates, 0o755)
         except shutil.Error as error:
             # `copytree` throws an error if copying to + from NFS even though
             # the copy is successful (see https://bugs.python.org/issue24564
@@ -1178,7 +1181,7 @@
             with open(lock_path, 'w', encoding='utf-8') as f:
                 f.write(template)
         elif not osp.exists(lock_path):
-            shutil.copy(lock_template, lock_path)
+            shutil.copyfile(lock_template, lock_path)
 
     def _get_package_template(self, silent=False):
         """Get the template the for staging package.json file.