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/usr/sbin/maas-region-celeryd is in maas-region-controller-min 1.5+bzr2252-0ubuntu1.

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#! /usr/bin/python
import os
from grp import getgrnam
from pwd import getpwnam

def start_celery(args):
    uid = getpwnam(args.user).pw_uid
    gid = getgrnam(args.group).gr_gid

    env = dict(os.environ, PYTHONPATH="/usr/share/maas")

    command = [
        'celeryd',
        '--logfile=%s' % args.logfile,
        '--schedule=%s' % args.schedule,
        '--loglevel=INFO',
        '--beat',
        '--queues=celery,master',
        ]

    # Change gid first, just in case changing the uid might deprive
    # us of the privileges required to setgid.
    os.setgid(gid)
    os.setuid(uid)

    os.execvpe(command[0], command, env=env)

def main():
    import argparse
    parser = argparse.ArgumentParser(
           description='MAAS celery daemon config options')
    parser.add_argument(
        '--user', '-u', metavar='USER', default='maas',
        help="System user identity that should run the cluster controller.")
    parser.add_argument(
        '--group', '-g', metavar='GROUP', default='maas',
        help="System group that should run the cluster controller.")
    parser.add_argument(
        '--logfile', '-l', metavar='LOGFILE', default='/var/log/maas/celery-region.log',
        help="Location of the logfile.")
    parser.add_argument(
        '--schedule', '-s', metavar='SCHEDULE', default='/var/lib/maas/celerybeat-region-schedule',
        help="Location of the beat schedule file.")

    args = args = parser.parse_args()

    start_celery(args)

if __name__ == '__main__':
   main()