Simple tool for rotating nginx log file

#!/bin/env python
"""Simple tool for rotating nginx log file
 
@author: Victor Lin (bornstub@gmail.com) blog: http://blog.ez2learn.com
"""
import os
import shutil
import optparse
import datetime
import logging
import subprocess
 
log = logging.getLogger(__name__)
 
def main():
    parser = optparse.OptionParser()
    parser.add_option('-p', '--pid', dest='pidFile', metavar="FILE", help='/path/to/nginx.pid')
    parser.add_option('-l', '--log', dest='logFile', metavar="FILE", help='/path/to/logfile')
    parser.add_option('-f', '--format', dest='nameFormat',
        help='format of rotated log file name' )
    parser.add_option('-o', '--owner', dest='owner', help='the owner user of log file to set')
    (options, args) = parser.parse_args()
 
    if not os.path.exists(options.logFile):
        log.info('The log file %s does not exist', options.logFile)
        return
 
    # move the log file
    newName = datetime.date.today().strftime(options.nameFormat)
    log.info('Move log file %s to %s', options.logFile, newName)
    subprocess.check_call('mv %s %s' % (options.logFile, newName), shell=True)
 
    if options.owner:
        log.info('Set owner of %s to %s', newName, options.owner)
        subprocess.check_call('chown %s %s' % (options.owner, newName), shell=True)
 
    # tell nginx to reopen the file
    log.info('Reopen log file')
    pid = int(open(options.pidFile, 'rt').read())
    os.kill(pid, 10)
 
    log.info('done')
 
if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO)
    main()