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import os
import sys
import traceback
def main(argv):
try:
# Only check the history if the build is running on a pull request.
if is_travis_pull_request():
# This function assumes that HEAD^1 is the base branch and HEAD^2 is the
# pull request.
exit_if_pull_request_has_merge_commits()
print 'Checked pull request history.'
else:
print 'Skipped history check.'
except Exception as e:
# Don't stop the build if this script has a bug.
traceback.print_exc(e)
def is_travis_pull_request():
'''Returns true if TRAVIS_PULL_REQUEST is set to indicate a pull request.'''
return os.environ['TRAVIS_PULL_REQUEST'] != 'false'
def exit_if_pull_request_has_merge_commits():
'''Exits with an error if any of the commits added by the pull request are
merge commits.'''
# Print the parents of each commit added by the pull request.
git_command = 'git log --format="%P" HEAD^1..HEAD^2'
for line in os.popen(git_command):
parents = line.split()
assert len(parents) >= 1, line
if len(parents) > 1:
print 'Pull request contains a merge commit:'
print_history()
sys.exit(1)
def print_history():
os.system('git log HEAD^1 HEAD^2 -30 --graph --oneline --decorate')
def read_process(command):
'''Runs a command and returns everything printed to stdout.'''
with os.popen(command, 'r') as fd:
return fd.read()
if __name__ == '__main__':
main(sys.argv)
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