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#!/usr/bin/env python
# Copyright (C) 2013 Linaro Ltd.

import argparse
import os
import re
import subprocess
from tempfile import gettempdir


# Match a directory that ends with .git, but not only .git
GIT_DIRECTORY_ENDS = re.compile(".+\.git$")
# Name for a lock file.
LOCK_FILE_NAME = "update-repost.lock"
LOCK_FILE = os.path.join(gettempdir(), LOCK_FILE_NAME)


def args_parser():
    """Sets up the argument parser."""
    parser = argparse.ArgumentParser()
    parser.add_argument("--repos-dir",
                        required=True,
                        help="The directory where repositories are stored.")
    parser.add_argument("--user",
                        help="User to run the commands as.")
    return parser


if __name__ == '__main__':
    parser = args_parser()
    args = parser.parse_args()

    try:
        if os.path.exists(LOCK_FILE):
            print "Another process is still running: cannot acquire lock."
        else:
            with open(LOCK_FILE, 'w'):
                for root, dirs, files in os.walk(os.path.abspath(args.repos_dir)):
                    if GIT_DIRECTORY_ENDS.match(root):
                        if files:
                            # We really are in a git repository.
                            cmd_args = []
                            if args.user:
                                cmd_args = ["sudo", "-u", args.user, "-H"]
                            cmd_args += ["git", "fetch", "--all", "-q"]
                            repo_name = os.path.basename(root)
                            process = subprocess.Popen(cmd_args,
                                                       cwd=root,
                                                       stdout=subprocess.PIPE,
                                                       stderr=subprocess.PIPE)

                            print "Updating '%s' repository..." % repo_name
                            p_out, p_err = process.communicate()
                            if process.returncode != 0:
                                print ("Error fetching updates for repository '%s'" % \
                                       repo_name)
                        else:
                            # git repositories always have a HEAD file, or it means they
                            # are empty.
                            continue
    finally:
        os.unlink(LOCK_FILE)