system-config/modules/gerrit/files/change-merged

#!/usr/bin/env python
#
# Gerrit-Launchpad Hook, inspired by https://github.com/hobbs/jirret
#
# Copyright (C) 2011 Catalyst IT (http://www.catalyst.net.nz)
# Copyright (C) 2011 Rackspace US, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Changed by James E. Blair <james.blair@rackspace.com> to add 
# config file parsing, and signed email with commands.

# Some parts:
# Copyright 2009-2011 Canonical Ltd.  This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).

from email.mime.text import MIMEText
from getopt import getopt
import re
import smtplib
import subprocess
import sys, os
import pyme, pyme.core
import StringIO
import ConfigParser

TO_ADDRESS_SUFFIX = '@bugs.launchpad.net'
BASE_DIR = '/home/gerrit2/review_site'
GERRIT_CONFIG = os.environ.get('GERRIT_CONFIG','/home/gerrit2/review_site/etc/gerrit.config')

def get_broken_config(filename):
  """ gerrit config ini files are broken and have leading tabs """
  text = ""
  with open(filename,"r") as conf:
    for line in conf.readlines():
      text = "%s%s" % (text, line.lstrip())

  fp = StringIO.StringIO(text)
  c=ConfigParser.ConfigParser()
  c.readfp(fp)
  return c

gerrit_config = get_broken_config(GERRIT_CONFIG)
FROM_ADDRESS = gerrit_config.get('user', 'email')


# From Launchpad: lib/lp/services/mail/incoming.py
# Match '\n' and '\r' line endings. That is, all '\r' that are not
# followed by a '\n', and all '\n' that are not preceded by a '\r'.
non_canonicalised_line_endings = re.compile('((?<!\r)\n)|(\r(?!\n))')

# Match trailing whitespace.
trailing_whitespace = re.compile(r'[ \t]*((?=\r\n)|$)')

def canonicalise_line_endings(text):
    r"""Canonicalise the line endings to '\r\n'.

        >>> canonicalise_line_endings('\n\nfoo\nbar\rbaz\r\n')
        '\r\n\r\nfoo\r\nbar\r\nbaz\r\n'

        >>> canonicalise_line_endings('\r\rfoo\r\nbar\rbaz\n')
        '\r\n\r\nfoo\r\nbar\r\nbaz\r\n'

        >>> canonicalise_line_endings('\r\nfoo\r\nbar\nbaz\r')
        '\r\nfoo\r\nbar\r\nbaz\r\n'
    """
    if non_canonicalised_line_endings.search(text):
        text = non_canonicalised_line_endings.sub('\r\n', text)
    if trailing_whitespace.search(text):
        text = trailing_whitespace.sub('', text)
    return text
# End code from Launchpad: lib/lp/services/mail/incoming.py

def email_tracker(change_url, project, branch, submitter, commit):
    # Extract git log of all merged commits
    git_log = subprocess.Popen(['git', '--git-dir=' + BASE_DIR + '/git/' + project + '.git', 'log', '--no-merges', commit + '^1..' + commit], stdout=subprocess.PIPE).communicate()[0]

    # Find bug numbers referenced in the git log
    bug_regexp = r'([Bb]ug|[Ll][Pp])\s*[#:]?\s*(\d+)'
    tokens = re.split(bug_regexp, git_log)

    # Extract unique bug numbers
    bugs = []
    for token in tokens:
        if re.match('^\d+$', token) and (token not in bugs):
            bugs.append(token)
            send_bug_mail(token, change_url, project, commit, submitter, branch, git_log)

def send_bug_mail(bug_number, change_url, project, commit, submitter, branch, git_log):

    to_address = bug_number + TO_ADDRESS_SUFFIX

    gitorious_url = 'http://github.com/%s/commit/%s' % (project, commit)
    body = '''Reviewed:  %s
Committed: %s
Submitter: %s
Branch:    %s

 status fixcommitted
 done\n''' % (change_url, gitorious_url, submitter, branch)

    body = body + '\n' + git_log

    bodypart = MIMEText(body)
    bodystring = bodypart.as_string()
    bodystring = canonicalise_line_endings(bodystring)

    plain = pyme.core.Data(bodystring)
    cipher = pyme.core.Data()
    gpg = pyme.core.Context()
    gpg.set_armor(1)

    gpg.op_keylist_start(FROM_ADDRESS, 0)
    gpg.op_sign(plain, cipher, pyme.pygpgme.GPGME_SIG_MODE_DETACH)
    cipher.seek(0,0)
    signature = cipher.read()

    from email.mime.multipart import MIMEMultipart
    from email.mime.base import MIMEBase
    msg = MIMEMultipart(_subtype='signed',protocol='application/pgp-signature')
    short_project = project.split("/")[-1]
    msg['Subject'] = 'Fix merged to %s (%s)' % (short_project, branch)
    msg['From'] = FROM_ADDRESS
    msg['To'] = to_address

    msg.attach(bodypart)
    signpart = MIMEBase('application','pgp-signature')
    signpart.set_payload(signature)
    msg.attach(signpart)

    #print msg.as_string()
    s = smtplib.SMTP()
    s.connect()
    s.sendmail(FROM_ADDRESS, [to_address], msg.as_string())
    s.quit()

def main():
    # https://gerrit.googlecode.com/svn/documentation/2.1.6/config-hooks.html#change-merged
    gerrit_args = ['change=', 'change-url=', 'project=', 'branch=', 'submitter=', 'commit=']
    args, unused = getopt(sys.argv[1:], '', gerrit_args)

    change_url = project = branch = submitter = commit = None
    for argname, argv in args:
        if argname == '--change-url':
            change_url = argv
        elif argname == '--project':
            project = argv
        elif argname == '--branch':
            branch = argv
        elif argname == '--submitter':
            submitter = argv
        elif argname == '--commit':
            commit = argv

    if change_url and project and branch and submitter and commit:
        email_tracker(change_url, project, branch, submitter, commit)
    else:
        print 'Missing arguments'
	return 1

    return 0;

if __name__ == '__main__':
    sys.exit(main())