[BUG] Prospector cannot run if the current user cannot read all directories in the workdir

[carlio]

Prospector cannot run if a directory not owned by the current user is in the working directory or a subdirectory

This can happen if a docker volume is in the current working directory, for example.

To reproduce:

$ sudo mkdir root-owned
$ sudo chmod 700 root-owned/
$ prospector
Traceback (most recent call last):
  File "/tmp/test/venv/bin/prospector", line 8, in <module>
    sys.exit(main())
  File "/tmp/test/venv/lib/python3.9/site-packages/prospector/run.py", line 173, in main
    config = ProspectorConfig()
  File "/tmp/test/venv/lib/python3.9/site-packages/prospector/config/__init__.py", line 30, in __init__
    self.libraries = self._find_used_libraries(self.config, self.profile)
  File "/tmp/test/venv/lib/python3.9/site-packages/prospector/config/__init__.py", line 169, in _find_used_libraries
    for found_dep in autodetect_libraries(self.workdir):
  File "/tmp/test/venv/lib/python3.9/site-packages/prospector/autodetect.py", line 93, in autodetect_libraries
    libraries = find_from_path(path)
  File "/tmp/test/venv/lib/python3.9/site-packages/prospector/autodetect.py", line 51, in find_from_path
    names |= find_from_path(item_path)
  File "/tmp/test/venv/lib/python3.9/site-packages/prospector/autodetect.py", line 46, in find_from_path
    for item in os.listdir(path):
PermissionError: [Errno 13] Permission denied: '/tmp/test/root-owned'

Autodetection and also finding python files breaks. Directories which are not readable should be either skipped, or a warning issued, and if specified in the --ignore-paths command line, should be ignored before trying to inspect them.

[carlio]

Fixed in 1.7.2