#! /usr/bin/env python
# Copyright (C) 2011 OpenStack, LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

# Ensure that the specified remote exists in the repo and pull revisions
# from upstream

# [project "UPSTREAM_PROJECT"]
# remote = https://gerrit.googlesource.com/gerrit

import ConfigParser
import StringIO
import logging
import os
import re
import subprocess


def run_command(cmd, status=False, env={}):
    if VERBOSE:
        print datetime.datetime.now(), "Running:", cmd
    cmd_list = shlex.split(str(cmd))
    newenv = os.environ
    newenv.update(env)
    p = subprocess.Popen(cmd_list, stdout=subprocess.PIPE,
                         stderr=subprocess.STDOUT, env=newenv)
    (out, nothing) = p.communicate()
    if status:
        return (p.returncode, out.strip())
    return out.strip()


def run_command_status(cmd, env={}):
    return run_command(cmd, True, env)


logging.basicConfig(level=logging.ERROR)

REPO_ROOT = os.environ.get('REPO_ROOT',
                           '/home/gerrit2/git')
REMOTES_CONFIG = os.environ.get('REMOTES_CONFIG',
                               '/home/gerrit2/remote.config')

PROJECT_RE = re.compile(r'^project\s+"(.*)"$')

config = ConfigParser.ConfigParser()
config.read(REMOTES_CONFIG)


for section in config.sections():
    # Each section looks like [project "openstack/project"]
    m = PROJECT_RE.match(section)
    if not m:
        continue
    project = m.group(1)
    project_git = "%s.git" % project
    os.chdir(os.path.join(REPO_ROOT, project_git))

    if not (config.has_option(section, "remote")):
        continue

    # Make sure that the specified remote exists
    remote_url = config.get(section, "remote")
    # We could check if it exists first, but we're ignoring output anyway
    # So just try to make it, and it'll either make a new one or do nothing
    run_command("git remote add -f upstream %s" % remote_url)
    # Fetch new revs from it
    run_command("git remote update upstream")