potentially misleading permissions error when incorrectly specifying python path

[dpastoor]

one of the solutions engineers reported an issue:

 rsconnect deploy fastapi -n connect_server -p .venv/ --entrypoint superbowlads:api ./
Checking arguments...                            [OK]
    Deploying ./ to server "https://SERVER.EXAMPLE.COM"
    Warning: Capturing the environment using 'pip freeze'.
             Consider creating a requirements.txt file instead.
Inspecting Python environment...                 Traceback (most recent call last):
  File "/USERHOME/PATH/TO/.venv/lib/python3.9/site-packages/rsconnect/actions.py", line 74, in cli_feedback
    yield
.....
PermissionError: [Errno 13] Permission denied: '.venv/'
[ERROR]
Internal error: [Errno 13] Permission denied: '.venv/'

after consulting the docs and some back and forth realized -p needed the path to the python executable.

My hypothesis is that the check https://github.com/rstudio/rsconnect-python/blob/master/rsconnect/actions.py#L111 may need to be slightly more restrictive to check if its actually a file.

I'll try to replicate/get a PR over but filing this issue as the starting point.

[mmarchetti]

Thank you