#!/usr/libexec/platform-python
"""
This wrapper was created to add an optional delay to the startup of nova-compute.
We know that instances will fail to boot, after a compute reboot, if ceph is not
healthy.

Ideally, we would poll ceph to get its health, but it's not guaranteed that the
compute node will have access to the keys.
"""

import os
import sys
import time
import logging
import argparse

parser = argparse.ArgumentParser(description='Process some integers.')
parser.add_argument('--config-file', dest='nova_config', action='store',
                    default="/etc/nova/nova.conf",
                    help='path to nova configuration (default: /etc/nova/nova.conf)')
parser.add_argument('--nova-binary', dest='nova_binary', action='store',
                    default="/usr/bin/nova-compute",
                    help='path to nova compute binary (default: /usr/bin/nova-compute)')
parser.add_argument('--delay', dest='delay', action='store',
                    default=120, type=int,
                    help='Number of seconds to wait until nova-compute is started')
parser.add_argument('--state-file', dest='state_file', action='store',
                    default="/run/nova-compute-delayed",
                    help='file exists if we already delayed nova-compute startup'\
                    '(default: /run/nova-compute-delayed)')


sections = {}
(args, remaining) = parser.parse_known_args(sys.argv)

real_args = [args.nova_binary, '--config-file', args.nova_config]
real_args.extend(remaining[1:])

if not os.path.isfile(args.state_file):
    logging.info("Delaying nova-compute startup by %s seconds" % args.delay)
    time.sleep(args.delay)
    open(args.state_file, 'a').close()

logging.info("Executing %s" % real_args)
os.execv(args.nova_binary, real_args)