[Buildbot] #3292: GitPoller can't get changed files on merge commit

[Buildbot trac]

#3292: GitPoller can't get changed files on merge commit
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Reporter:  boolking   |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.8.12     |   Keywords:
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 _get_commit_files in gitpoller.py use git-log command to get changed file
 of a commit:

 def _get_commit_files(self, rev):
     args = ['--name-only', '--no-walk', r'--format=%n', rev, '--']

 But when a commit is a merge commit, this command won't get any file.
 Following patch will fix it:

 def _get_commit_files(self, rev):
     args = ['--name-only', '--no-walk', r'--format=%n', '-first-parent',
 '-m', rev, '--']

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Ticket URL: <http://trac.buildbot.net/ticket/3292>
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Buildbot: build/test automation