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52 lines
1.7 KiB
52 lines
1.7 KiB
import os
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import sys
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import traceback
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def main(argv):
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# Only check the history if the build is running on a pull request.
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# Build could be running on pull request using travis or kokoro.
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if is_travis_pull_request() or is_kokoro_presubmit_request():
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# This function assumes that HEAD^1 is the base branch and HEAD^2 is the
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# pull request.
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exit_if_pull_request_has_merge_commits()
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print 'Checked pull request history: SUCCEEDED'
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else:
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print 'Skipped history check.'
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def is_kokoro_presubmit_request():
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'''Returns true if KOKORO_GITHUB_PULL_REQUEST_NUMBER is set.'''
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if 'KOKORO_GITHUB_PULL_REQUEST_NUMBER' in os.environ:
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return True
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return False
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def is_travis_pull_request():
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'''Returns true if TRAVIS_PULL_REQUEST is set to indicate a pull request.'''
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if 'TRAVIS_PULL_REQUEST' in os.environ:
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return os.environ['TRAVIS_PULL_REQUEST'] != 'false'
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return False
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def exit_if_pull_request_has_merge_commits():
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'''Exits with an error if any of the commits added by the pull request are
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merge commits.'''
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# Print the parents of each commit added by the pull request.
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git_command = 'git log --format="%P" HEAD^1..HEAD^2'
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for line in os.popen(git_command):
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parents = line.split()
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assert len(parents) >= 1, line
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if len(parents) > 1:
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print 'Pull request contains a merge commit:'
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print_history()
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print 'Checked pull request history: FAILED'
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sys.exit(1)
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def print_history():
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os.system('git log HEAD^1 HEAD^2 -30 --graph --oneline --decorate')
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def read_process(command):
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'''Runs a command and returns everything printed to stdout.'''
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with os.popen(command, 'r') as fd:
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return fd.read()
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if __name__ == '__main__':
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main(sys.argv)
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