tests fail against git-1.8.3

[warner]

They worked against git-1.8.2.3 (and earlier), but fail when run with git-1.8.3 (and later).

FAIL: test_full (__main__.Repo)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test/test_git.py", line 115, in test_full
    self.do_checks(short, full, dirty=False, state="SA")
  File "test/test_git.py", line 167, in do_checks
    self.check_version(target, exp_short_TD, exp_long, False, state, tree="TD")
  File "test/test_git.py", line 201, in check_version
    self.compare(v, exp_short, state, tree, "RA")
  File "test/test_git.py", line 189, in compare
    % (where, got, expected))
AssertionError: SA/TD/RA: got 'bcf1f672131090156fb30bd9597799cb73d68693' != expected '1.0'

[warner]

It looks like the guilty git commit was git/git@e52e6f7 which changed pretty.c to use the format_decoration() from log-tree.c instead of its own. This function is used when expanding $Format:%d in the _version.py file, when making a tarball with git-archive. They combined these to take advantage of new color-hilighting code (shared between 'git log --decorate' and other places that can show these decorations). The git-1.8.2.3 version expands $Format:%d$ into (HEAD, demo-1.0, master), whereas the git-1.8.3 code expands it to (HEAD, tag: demo-1.0, master).

https://github.com/warner/python-versioneer/blob/master/src/git/middle.py#L33 then parses this list. It looks for tags by recognizing a configurable prefix (in this case, demo-). The new tag: string prevents the match from happening, so the parser concludes there are no tags, and falls back to using the full revision hash.