[Python-modules-team] Bug#915408: fails to parse version numbers with tilde (2.2.4~deb9u1)

[Antoine Beaupre]

Package: python-setuptools-scm
Version: 1.15.0-1
Severity: normal

I am trying to upload a stable update of monkeysign to Debian stable
with a version number 2.2.4~deb9u1. sbuild fails to process the
package with the following backtrace:

dpkg-buildpackage
-----------------

dpkg-buildpackage: info: source package monkeysign
dpkg-buildpackage: info: source version 2.2.4~deb9u1
dpkg-buildpackage: info: source distribution stretch
dpkg-buildpackage: info: source changed by Antoine Beaupré <anarcat at debian.org>
 dpkg-source --before-build monkeysign-2.2.4~deb9u1
dpkg-buildpackage: info: host architecture amd64
 fakeroot debian/rules clean
dh clean  --with=python2,sphinxdoc --buildsystem=pybuild
   dh_testdir -O--buildsystem=pybuild
   dh_auto_clean -O--buildsystem=pybuild
I: pybuild base:184: python2.7 setup.py clean 
Traceback (most recent call last):
  File "setup.py", line 82, in <module>
    test_suite='monkeysign.tests',
  File "/usr/lib/python2.7/distutils/core.py", line 111, in setup
    _setup_distribution = dist = klass(attrs)
  File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 320, in __init__
    _Distribution.__init__(self, attrs)
  File "/usr/lib/python2.7/distutils/dist.py", line 287, in __init__
    self.finalize_options()
  File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 387, in finalize_options
    ep.load()(self, ep.name, value)
  File "/usr/lib/python2.7/dist-packages/setuptools_scm/integration.py", line 19, in version_keyword
    dist.metadata.version = get_version(**value)
  File "/usr/lib/python2.7/dist-packages/setuptools_scm/__init__.py", line 117, in get_version
    parsed_version = _do_parse(root, parse)
  File "/usr/lib/python2.7/dist-packages/setuptools_scm/__init__.py", line 66, in _do_parse
    return meta(pretended)
  File "/usr/lib/python2.7/dist-packages/setuptools_scm/version.py", line 86, in meta
    assert tag is not None, 'cant parse version %s' % tag
AssertionError: cant parse version None
E: pybuild pybuild:283: clean: plugin distutils failed with: exit code=1: python2.7 setup.py clean 
dh_auto_clean: pybuild --clean -i python{version} -p 2.7 returned exit code 13
debian/rules:11: recipe for target 'clean' failed
make: *** [clean] Error 25

The build succeeds with 2.2.3+deb9u1 as a version number, so I feel
it's something specific to the tilde version number.

This might or might not occur in unstable.

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'experimental'), (1, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.18.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_CA.UTF-8, LC_CTYPE=fr_CA.UTF-8 (charmap=UTF-8), LANGUAGE=fr_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python-setuptools-scm depends on:
ii  python                2.7.15-3
ii  python-pkg-resources  40.5.0-1

python-setuptools-scm recommends no packages.

python-setuptools-scm suggests no packages.

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