pip fails to install development version of s3cmd due to invalid version string

[salty-horse]

When attempting to install s3cmd from git, this error appears:

$ pip install https://github.com/s3tools/s3cmd/archive/5834228d5bddde3819a3ae5506dd656b62dfb2d1.zip
[...]
  WARNING: Built wheel for s3cmd is invalid: Metadata 1.2 mandates PEP 440 version, but '2.1.0-' is not

This is due to a recent change in pip 20.3.4:

pip wheel now verifies the built wheel contains valid metadata, and can be installed by a subsequent pip install. This can be disabled with --no-verify.

I believe it doesn't like the + in the current development version string 2.1.0+. Please consider using a valid version number for development versions in the future.

See #1182 (comment) for a workaround.

[fviard]

Thank you very much for the investigation as the problem was not obvious.
I have pushed a change to rename the dev version to 2.1.0-dev.
I hope that pip should now be happy.
Please let me know if you encounter another issue.

[salty-horse]

@fviard Nothing was pushed to master yet - the last commits are pushed in December. Am I missing anything?

[fviard]

You are right, sorry, i'm losing my head. It is rightly pushed now!
Thank you!

[salty-horse]

Thanks! I can confirm it fixes the pip install issue.