virtualenv should print help and return 2

[nsoranzo]

or anything greater than 0.

Behaviour pre v20:

(virtualenv16.7.9_venv) $ virtualenv --version
16.7.9
(virtualenv16.7.9_venv) $ virtualenv 
You must provide a DEST_DIR
Usage: virtualenv [OPTIONS] DEST_DIR

Options:
  --version             show program's version number and exit
...
(virtualenv16.7.9_venv) $ echo $?
2

New behaviour in v20.0.1:

(virtualenv20.0.1_venv) $ virtualenv --version
virtualenv 20.0.1 from /tmp/virtualenv20.0.1_venv/local/lib/python2.7/site-packages/virtualenv/__init__.pyc
(virtualenv20.0.1_venv) $ virtualenv 
(virtualenv20.0.1_venv) $ echo $?
0

[gaborbernat]

The help is printed with --help\-h. All values have defaults so there's no reason why not just execute the create virtual environment command. Any reason why you want a help with no arguments, for example, the Linux command ls does not print help when you invoke it without arguments, so it's not like a mandatory requirement. Granted pre 20 we did, but we made the major bump exactly to not be shackled by such subtle differences.

[nsoranzo]

Ah, it was not clear at all to me that it was creating a virtualenv in venv, closing in favour of #1557.

[gaborbernat]

Hello, a fix for this issue has been released via virtualenv 20.0.2; see https://pypi.org/project/virtualenv/20.0.2/ (https://virtualenv.pypa.io/en/latest/changelog.html#v20-0-2-2020-02-11) . Please give a try and report back if your issue has not been addressed; if not, please comment here, and we'll reopen the ticket. We want to apologize for the inconvenience this has caused you and say thanks for having patience while we resolve the unexpected bugs with this new major release.