#7399 generate unstable package versions which can be ordered by timestamp in release.sh Issue created by cosmicexplorer CI on master was broken after merging 0672383, because when building wheels, our release script sets

PANTS_UNSTABLE_VERSION

to be the version in

src/python/pants/VERSION

, along with the first 8 characters of the commit sha. This should be fine, but not mentioned in https://www.python.org/dev/peps/pep-0440/#local-version-identifiers is that local build tags which consist of only numbers will have leading zeroes truncated, e.g.:

X> pex packaging setuptools
Python 2.7.15 (default, Jun 20 2018, 17:40:09)
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.39.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from packaging.version import Version
>>> Version('1.15.0.dev4+06723833')
<Version('1.15.0.dev4+6723833')>
>>> str(Version('1.15.0.dev4+06723833'))
'1.15.0.dev4+6723833'

This required a fix in #7400 by prefacing the sha with a constant non-numeric string to avoid it getting parsed as a number. While that was fixed, it might also be pretty useful to further modify the

PANTS_UNSTABLE_VERSION

, to add a timestamp before the SHA. This would allow

ls

to ensure the most recently produced wheel would always be at the bottom of the output. pantsbuild/pants