[Bug 2018519] Re: dput crashes if setuptools version is greater than 66

[Mark Esler]

Please see https://bugs.launchpad.net/ubuntu/+source/distro-
info/+bug/1991606

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Title:
  dput crashes if setuptools version is greater than 66

Status in dput package in Ubuntu:
  Confirmed

Bug description:
  I'm using dput version 1.0.3ubuntu1 on Ubuntu 20.04. Setuptools
  version 66 introduced a breaking change to end support of version
  strings which don't conform to PEP 440. If the installed setuptools
  version is 66 or higher, the dput launcher script fails with this
  error:

  adrianna at sergyar:~/packaging/beta$ dput
  Traceback (most recent call last):
    File "/usr/bin/dput", line 6, in <module>
      from pkg_resources import load_entry_point
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3327, in <module>
      def _initialize_master_working_set():
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3301, in _call_aside
      f(*args, **kwargs)
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3339, in _initialize_master_working_set
      working_set = WorkingSet._build_master()
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 629, in _build_master
      ws.require(__requires__)
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 966, in require
      needed = self.resolve(parse_requirements(requirements))
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 827, in resolve
      dist = self._resolve_dist(
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 852, in _resolve_dist
      if dist is None or (dist not in req and replace_conflicting):
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3204, in __contains__
      return self.specifier.contains(item, prereleases=True)
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/_vendor/packaging/specifiers.py", line 902, in contains
      item = Version(item)
    File "/home/adrianna/.local/lib/python3.8/site-packages/pkg_resources/_vendor/packaging/version.py", line 197, in __init__
      raise InvalidVersion(f"Invalid version: '{version}'")
  pkg_resources.extern.packaging.version.InvalidVersion: Invalid version: '1.0.3ubuntu1'

  The only workaround is to downgrade setuptools to an older version.

  If this was fixed in a more recent version of dput, can the fix be
  backported to Focal?

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