switch .is_dir and .exists for os.access to avoid PermissionError on startup

archivebox/misc/checks.py

@@ -1,5 +1,6 @@
 __package__ = 'archivebox.misc'
 
+import os
 import sys
 
 from rich import print
@@ -14,7 +15,7 @@ from rich import print
 def check_data_folder() -> None:
     from archivebox import DATA_DIR, ARCHIVE_DIR
     
-    archive_dir_exists = ARCHIVE_DIR.exists()
+    archive_dir_exists = os.access(ARCHIVE_DIR, os.R_OK) and ARCHIVE_DIR.is_dir()
     if not archive_dir_exists:
         print('[red][X] No archivebox index found in the current directory.[/red]', file=sys.stderr)
         print(f'    {DATA_DIR}', file=sys.stderr)

archivebox/misc/system.py

@@ -114,7 +114,7 @@ def chmod_file(path: str, cwd: str='') -> None:
     """chmod -R <permissions> <cwd>/<path>"""
 
     root = Path(cwd or os.getcwd()) / path
-    if not root.exists():
+    if not os.access(root, os.R_OK):
         raise Exception('Failed to chmod: {} does not exist (did the previous step fail?)'.format(path))
 
     if not root.is_dir():
@@ -132,6 +132,9 @@ def chmod_file(path: str, cwd: str='') -> None:
 @enforce_types
 def copy_and_overwrite(from_path: Union[str, Path], to_path: Union[str, Path]):
     """copy a given file or directory to a given path, overwriting the destination"""
+    
+    assert os.access(from_path, os.R_OK)
+    
     if Path(from_path).is_dir():
         shutil.rmtree(to_path, ignore_errors=True)
         shutil.copytree(from_path, to_path)