#!/usr/bin/env python2.7
import os
import sys
import subprocess
import logging
import shutil
import time

os.environ["PYTHONUNBUFFERED"] = "y"

sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..'))
from zulip_tools import DEPLOYMENTS_DIR, LOCK_DIR, FAIL, WARNING, ENDC, \
    su_to_zulip

logging.basicConfig(format="%(asctime)s upgrade-zulip: %(message)s",
                    level=logging.INFO)

if os.getuid() != 0:
    logging.error("Must be run as root.")
    sys.exit(1)

if len(sys.argv) != 2:
    print FAIL + "Usage: %s <tarball>" % (sys.argv[0],) + ENDC
    sys.exit(1)

tarball_path = sys.argv[1]

start_time = time.time()
got_lock = False
while time.time() - start_time < 300:
    try:
        os.mkdir(LOCK_DIR)
        got_lock = True
        break
    except OSError:
        print WARNING + "Another deployment in progress; waiting for lock... (If no deployment is running, rmdir %s)" % (LOCK_DIR,) + ENDC
        time.sleep(10)

if not got_lock:
    print FAIL + "Deployment already in progress.  Please run\n" \
               + "  %s/current/scripts/upgrade-zulip %s\n" % (DEPLOYMENTS_DIR, tarball_path) \
               + "manually when the previous deployment finishes, or run\n" \
               + "  rmdir %s\n"  % (LOCK_DIR,) \
               + "if the previous deployment crashed." \
               + ENDC
    sys.exit(1)

logging.info("Unpacking the tarball")
deploy_path = subprocess.check_output([os.path.realpath(os.path.join(os.path.dirname(__file__),
                                                                     'unpack-zulip')),
                                       tarball_path], preexec_fn=su_to_zulip)
deploy_path = deploy_path.strip()
os.chdir(deploy_path)

subprocess.check_call(["./scripts/lib/upgrade-zulip-stage-2", deploy_path])

logging.info("Deployment complete")
shutil.rmtree(LOCK_DIR)