repo

#!/usr/bin/env python
# -*- coding:utf-8 -*-

"""Repo launcher.

This is a standalone tool that people may copy to anywhere in their system.
It is used to get an initial repo client checkout, and after that it runs the
copy of repo in the checkout.
"""

from __future__ import print_function

# repo default configuration
#
import os
REPO_URL = os.environ.get('REPO_URL', None)
if not REPO_URL:
  REPO_URL = 'https://gerrit.googlesource.com/git-repo'
REPO_REV = 'stable'

# Copyright (C) 2008 Google Inc.
#
# 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.

# increment this whenever we make important changes to this script
VERSION = (1, 26)

# increment this if the MAINTAINER_KEYS block is modified
KEYRING_VERSION = (1, 2)

# Each individual key entry is created by using:
# gpg --armor --export keyid
MAINTAINER_KEYS = """

     Repo Maintainer <repo@android.kernel.org>
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.2.2 (GNU/Linux)

mQGiBEj3ugERBACrLJh/ZPyVSKeClMuznFIrsQ+hpNnmJGw1a9GXKYKk8qHPhAZf
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p3v5ILwfC7hVx4jHSnOgZ65L9s8EQdVr1ckN9243yta7rNgwfcqb60ILMFF1BRk/
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TACbBS+Up3RpfYVfd63c1cDdlru13pQAn3NQy/SN858MkxN+zym86UBgOad2
=CMiZ
-----END PGP PUBLIC KEY BLOCK-----

     Conley Owens <cco3@android.com>
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.11 (GNU/Linux)

mQENBFHRvc8BCADFg45Xx/y6QDC+T7Y/gGc7vx0ww7qfOwIKlAZ9xG3qKunMxo+S
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+H/g3HsL2LOB9uoIm8/5p2TTU5ttYCXMHhQZ81AY
=AUp4
-----END PGP PUBLIC KEY BLOCK-----
"""

GIT = 'git'                      # our git command
MIN_GIT_VERSION = (1, 7, 2)      # minimum supported git version
repodir = '.repo'                # name of repo's private directory
S_repo = 'repo'                  # special repo repository
S_manifests = 'manifests'        # special manifest repository
REPO_MAIN = S_repo + '/main.py'  # main script
MIN_PYTHON_VERSION = (2, 7)      # minimum supported python version
GITC_CONFIG_FILE = '/gitc/.config'
GITC_FS_ROOT_DIR = '/gitc/manifest-rw/'


import collections
import errno
import optparse
import platform
import re
import shutil
import stat
import subprocess
import sys

if sys.version_info[0] == 3:
  import urllib.request
  import urllib.error
else:
  import imp
  import urllib2
  urllib = imp.new_module('urllib')
  urllib.request = urllib2
  urllib.error = urllib2


# Python version check
ver = sys.version_info
if (ver[0], ver[1]) < MIN_PYTHON_VERSION:
  print('error: Python version {} unsupported.\n'
        'Please use Python {}.{} instead.'.format(
            sys.version.split(' ')[0],
            MIN_PYTHON_VERSION[0],
            MIN_PYTHON_VERSION[1],
        ), file=sys.stderr)
  sys.exit(1)

home_dot_repo = os.path.expanduser('~/.repoconfig')
gpg_dir = os.path.join(home_dot_repo, 'gnupg')

extra_args = []
init_optparse = optparse.OptionParser(usage="repo init -u url [options]")

# Logging
group = init_optparse.add_option_group('Logging options')
group.add_option('-q', '--quiet',
                 dest="quiet", action="store_true", default=False,
                 help="be quiet")

# Manifest
group = init_optparse.add_option_group('Manifest options')
group.add_option('-u', '--manifest-url',
                 dest='manifest_url',
                 help='manifest repository location', metavar='URL')
group.add_option('-b', '--manifest-branch',
                 dest='manifest_branch',
                 help='manifest branch or revision', metavar='REVISION')
group.add_option('-m', '--manifest-name',
                 dest='manifest_name',
                 help='initial manifest file', metavar='NAME.xml')
group.add_option('--current-branch',
                 dest='current_branch_only', action='store_true',
                 help='fetch only current manifest branch from server')
group.add_option('--mirror',
                 dest='mirror', action='store_true',
                 help='create a replica of the remote repositories '
                      'rather than a client working directory')
group.add_option('--reference',
                 dest='reference',
                 help='location of mirror directory', metavar='DIR')
group.add_option('--dissociate',
                 dest='dissociate', action='store_true',
                 help='dissociate from reference mirrors after clone')
group.add_option('--depth', type='int', default=None,
                 dest='depth',
                 help='create a shallow clone with given depth; see git clone')
group.add_option('--partial-clone', action='store_true',
                 dest='partial_clone',
                 help='perform partial clone (https://git-scm.com/'
                 'docs/gitrepository-layout#_code_partialclone_code)')
group.add_option('--clone-filter', action='store', default='blob:none',
                 dest='clone_filter',
                 help='filter for use with --partial-clone [default: %default]')
group.add_option('--archive',
                 dest='archive', action='store_true',
                 help='checkout an archive instead of a git repository for '
                      'each project. See git archive.')
group.add_option('--submodules',
                 dest='submodules', action='store_true',
                 help='sync any submodules associated with the manifest repo')
group.add_option('-g', '--groups',
                 dest='groups', default='default',
                 help='restrict manifest projects to ones with specified '
                      'group(s) [default|all|G1,G2,G3|G4,-G5,-G6]',
                 metavar='GROUP')
group.add_option('-p', '--platform',
                 dest='platform', default="auto",
                 help='restrict manifest projects to ones with a specified '
                      'platform group [auto|all|none|linux|darwin|...]',
                 metavar='PLATFORM')
group.add_option('--no-clone-bundle',
                 dest='no_clone_bundle', action='store_true',
                 help='disable use of /clone.bundle on HTTP/HTTPS')
group.add_option('--no-tags',
                 dest='no_tags', action='store_true',
                 help="don't fetch tags in the manifest")


# Tool
group = init_optparse.add_option_group('repo Version options')
group.add_option('--repo-url',
                 dest='repo_url',
                 help='repo repository location', metavar='URL')
group.add_option('--repo-branch',
                 dest='repo_branch',
                 help='repo branch or revision', metavar='REVISION')
group.add_option('--no-repo-verify',
                 dest='no_repo_verify', action='store_true',
                 help='do not verify repo source code')

# Other
group = init_optparse.add_option_group('Other options')
group.add_option('--config-name',
                 dest='config_name', action="store_true", default=False,
                 help='Always prompt for name/e-mail')


def _GitcInitOptions(init_optparse_arg):
  init_optparse_arg.set_usage("repo gitc-init -u url -c client [options]")
  g = init_optparse_arg.add_option_group('GITC options')
  g.add_option('-f', '--manifest-file',
               dest='manifest_file',
               help='Optional manifest file to use for this GITC client.')
  g.add_option('-c', '--gitc-client',
               dest='gitc_client',
               help='The name of the gitc_client instance to create or modify.')

_gitc_manifest_dir = None


def get_gitc_manifest_dir():
  global _gitc_manifest_dir
  if _gitc_manifest_dir is None:
    _gitc_manifest_dir = ''
    try:
      with open(GITC_CONFIG_FILE, 'r') as gitc_config:
        for line in gitc_config:
          match = re.match('gitc_dir=(?P<gitc_manifest_dir>.*)', line)
          if match:
            _gitc_manifest_dir = match.group('gitc_manifest_dir')
    except IOError:
      pass
  return _gitc_manifest_dir


def gitc_parse_clientdir(gitc_fs_path):
  """Parse a path in the GITC FS and return its client name.

  @param gitc_fs_path: A subdirectory path within the GITC_FS_ROOT_DIR.

  @returns: The GITC client name
  """
  if gitc_fs_path == GITC_FS_ROOT_DIR:
    return None
  if not gitc_fs_path.startswith(GITC_FS_ROOT_DIR):
    manifest_dir = get_gitc_manifest_dir()
    if manifest_dir == '':
      return None
    if manifest_dir[-1] != '/':
      manifest_dir += '/'
    if gitc_fs_path == manifest_dir:
      return None
    if not gitc_fs_path.startswith(manifest_dir):
      return None
    return gitc_fs_path.split(manifest_dir)[1].split('/')[0]
  return gitc_fs_path.split(GITC_FS_ROOT_DIR)[1].split('/')[0]


class CloneFailure(Exception):

  """Indicate the remote clone of repo itself failed.
  """


def _Init(args, gitc_init=False):
  """Installs repo by cloning it over the network.
  """
  if gitc_init:
    _GitcInitOptions(init_optparse)
  opt, args = init_optparse.parse_args(args)
  if args:
    init_optparse.print_usage()
    sys.exit(1)

  url = opt.repo_url
  if not url:
    url = REPO_URL
    extra_args.append('--repo-url=%s' % url)

  branch = opt.repo_branch
  if not branch:
    branch = REPO_REV
    extra_args.append('--repo-branch=%s' % branch)

  if branch.startswith('refs/heads/'):
    branch = branch[len('refs/heads/'):]
  if branch.startswith('refs/'):
    print("fatal: invalid branch name '%s'" % branch, file=sys.stderr)
    raise CloneFailure()

  try:
    if gitc_init:
      gitc_manifest_dir = get_gitc_manifest_dir()
      if not gitc_manifest_dir:
        print('fatal: GITC filesystem is not available. Exiting...',
              file=sys.stderr)
        sys.exit(1)
      gitc_client = opt.gitc_client
      if not gitc_client:
        gitc_client = gitc_parse_clientdir(os.getcwd())
      if not gitc_client:
        print('fatal: GITC client (-c) is required.', file=sys.stderr)
        sys.exit(1)
      client_dir = os.path.join(gitc_manifest_dir, gitc_client)
      if not os.path.exists(client_dir):
        os.makedirs(client_dir)
      os.chdir(client_dir)
      if os.path.exists(repodir):
        # This GITC Client has already initialized repo so continue.
        return

    os.mkdir(repodir)
  except OSError as e:
    if e.errno != errno.EEXIST:
      print('fatal: cannot make %s directory: %s'
            % (repodir, e.strerror), file=sys.stderr)
      # Don't raise CloneFailure; that would delete the
      # name. Instead exit immediately.
      #
      sys.exit(1)

  _CheckGitVersion()
  try:
    if NeedSetupGnuPG():
      can_verify = SetupGnuPG(opt.quiet)
    else:
      can_verify = True

    dst = os.path.abspath(os.path.join(repodir, S_repo))
    _Clone(url, dst, opt.quiet, not opt.no_clone_bundle)

    if can_verify and not opt.no_repo_verify:
      rev = _Verify(dst, branch, opt.quiet)
    else:
      rev = 'refs/remotes/origin/%s^0' % branch

    _Checkout(dst, branch, rev, opt.quiet)

    if not os.path.isfile(os.path.join(dst, 'repo')):
      print("warning: '%s' does not look like a git-repo repository, is "
            "REPO_URL set correctly?" % url, file=sys.stderr)

  except CloneFailure:
    if opt.quiet:
      print('fatal: repo init failed; run without --quiet to see why',
            file=sys.stderr)
    raise


# The git version info broken down into components for easy analysis.
# Similar to Python's sys.version_info.
GitVersion = collections.namedtuple(
    'GitVersion', ('major', 'minor', 'micro', 'full'))

def ParseGitVersion(ver_str=None):
  if ver_str is None:
    # Load the version ourselves.
    ver_str = _GetGitVersion()

  if not ver_str.startswith('git version '):
    return None

  full_version = ver_str[len('git version '):].strip()
  num_ver_str = full_version.split('-')[0]
  to_tuple = []
  for num_str in num_ver_str.split('.')[:3]:
    if num_str.isdigit():
      to_tuple.append(int(num_str))
    else:
      to_tuple.append(0)
  to_tuple.append(full_version)
  return GitVersion(*to_tuple)


def _GetGitVersion():
  cmd = [GIT, '--version']
  try:
    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  except OSError as e:
    print(file=sys.stderr)
    print("fatal: '%s' is not available" % GIT, file=sys.stderr)
    print('fatal: %s' % e, file=sys.stderr)
    print(file=sys.stderr)
    print('Please make sure %s is installed and in your path.' % GIT,
          file=sys.stderr)
    raise

  ver_str = proc.stdout.read().strip()
  proc.stdout.close()
  proc.wait()
  return ver_str.decode('utf-8')


def _CheckGitVersion():
  try:
    ver_act = ParseGitVersion()
  except OSError:
    raise CloneFailure()

  if ver_act is None:
    print('fatal: unable to detect git version', file=sys.stderr)
    raise CloneFailure()

  if ver_act < MIN_GIT_VERSION:
    need = '.'.join(map(str, MIN_GIT_VERSION))
    print('fatal: git %s or later required' % need, file=sys.stderr)
    raise CloneFailure()


def NeedSetupGnuPG():
  if not os.path.isdir(home_dot_repo):
    return True

  kv = os.path.join(home_dot_repo, 'keyring-version')
  if not os.path.exists(kv):
    return True

  kv = open(kv).read()
  if not kv:
    return True

  kv = tuple(map(int, kv.split('.')))
  if kv < KEYRING_VERSION:
    return True
  return False


def SetupGnuPG(quiet):
  try:
    os.mkdir(home_dot_repo)
  except OSError as e:
    if e.errno != errno.EEXIST:
      print('fatal: cannot make %s directory: %s'
            % (home_dot_repo, e.strerror), file=sys.stderr)
      sys.exit(1)

  try:
    os.mkdir(gpg_dir, stat.S_IRWXU)
  except OSError as e:
    if e.errno != errno.EEXIST:
      print('fatal: cannot make %s directory: %s' % (gpg_dir, e.strerror),
            file=sys.stderr)
      sys.exit(1)

  env = os.environ.copy()
  try:
    env['GNUPGHOME'] = gpg_dir
  except UnicodeEncodeError:
    env['GNUPGHOME'] = gpg_dir.encode()

  cmd = ['gpg', '--import']
  try:
    proc = subprocess.Popen(cmd,
                            env=env,
                            stdin=subprocess.PIPE)
  except OSError as e:
    if not quiet:
      print('warning: gpg (GnuPG) is not available.', file=sys.stderr)
      print('warning: Installing it is strongly encouraged.', file=sys.stderr)
      print(file=sys.stderr)
    return False

  proc.stdin.write(MAINTAINER_KEYS.encode('utf-8'))
  proc.stdin.close()

  if proc.wait() != 0:
    print('fatal: registering repo maintainer keys failed', file=sys.stderr)
    sys.exit(1)
  print()

  fd = open(os.path.join(home_dot_repo, 'keyring-version'), 'w')
  fd.write('.'.join(map(str, KEYRING_VERSION)) + '\n')
  fd.close()
  return True


def _SetConfig(local, name, value):
  """Set a git configuration option to the specified value.
  """
  cmd = [GIT, 'config', name, value]
  if subprocess.Popen(cmd, cwd=local).wait() != 0:
    raise CloneFailure()


def _InitHttp():
  handlers = []

  mgr = urllib.request.HTTPPasswordMgrWithDefaultRealm()
  try:
    import netrc
    n = netrc.netrc()
    for host in n.hosts:
      p = n.hosts[host]
      mgr.add_password(p[1], 'http://%s/' % host, p[0], p[2])
      mgr.add_password(p[1], 'https://%s/' % host, p[0], p[2])
  except:
    pass
  handlers.append(urllib.request.HTTPBasicAuthHandler(mgr))
  handlers.append(urllib.request.HTTPDigestAuthHandler(mgr))

  if 'http_proxy' in os.environ:
    url = os.environ['http_proxy']
    handlers.append(urllib.request.ProxyHandler({'http': url, 'https': url}))
  if 'REPO_CURL_VERBOSE' in os.environ:
    handlers.append(urllib.request.HTTPHandler(debuglevel=1))
    handlers.append(urllib.request.HTTPSHandler(debuglevel=1))
  urllib.request.install_opener(urllib.request.build_opener(*handlers))


def _Fetch(url, local, src, quiet):
  if not quiet:
    print('Get %s' % url, file=sys.stderr)

  cmd = [GIT, 'fetch']
  if quiet:
    cmd.append('--quiet')
    err = subprocess.PIPE
  else:
    err = None
  cmd.append(src)
  cmd.append('+refs/heads/*:refs/remotes/origin/*')
  cmd.append('+refs/tags/*:refs/tags/*')

  proc = subprocess.Popen(cmd, cwd=local, stderr=err)
  if err:
    proc.stderr.read()
    proc.stderr.close()
  if proc.wait() != 0:
    raise CloneFailure()


def _DownloadBundle(url, local, quiet):
  if not url.endswith('/'):
    url += '/'
  url += 'clone.bundle'

  proc = subprocess.Popen(
      [GIT, 'config', '--get-regexp', 'url.*.insteadof'],
      cwd=local,
      stdout=subprocess.PIPE)
  for line in proc.stdout:
    line = line.decode('utf-8')
    m = re.compile(r'^url\.(.*)\.insteadof (.*)$').match(line)
    if m:
      new_url = m.group(1)
      old_url = m.group(2)
      if url.startswith(old_url):
        url = new_url + url[len(old_url):]
        break
  proc.stdout.close()
  proc.wait()

  if not url.startswith('http:') and not url.startswith('https:'):
    return False

  dest = open(os.path.join(local, '.git', 'clone.bundle'), 'w+b')
  try:
    try:
      r = urllib.request.urlopen(url)
    except urllib.error.HTTPError as e:
      if e.code in [401, 403, 404, 501]:
        return False
      print('fatal: Cannot get %s' % url, file=sys.stderr)
      print('fatal: HTTP error %s' % e.code, file=sys.stderr)
      raise CloneFailure()
    except urllib.error.URLError as e:
      print('fatal: Cannot get %s' % url, file=sys.stderr)
      print('fatal: error %s' % e.reason, file=sys.stderr)
      raise CloneFailure()
    try:
      if not quiet:
        print('Get %s' % url, file=sys.stderr)
      while True:
        buf = r.read(8192)
        if not buf:
          return True
        dest.write(buf)
    finally:
      r.close()
  finally:
    dest.close()


def _ImportBundle(local):
  path = os.path.join(local, '.git', 'clone.bundle')
  try:
    _Fetch(local, local, path, True)
  finally:
    os.remove(path)


def _Clone(url, local, quiet, clone_bundle):
  """Clones a git repository to a new subdirectory of repodir
  """
  try:
    os.mkdir(local)
  except OSError as e:
    print('fatal: cannot make %s directory: %s' % (local, e.strerror),
          file=sys.stderr)
    raise CloneFailure()

  cmd = [GIT, 'init', '--quiet']
  try:
    proc = subprocess.Popen(cmd, cwd=local)
  except OSError as e:
    print(file=sys.stderr)
    print("fatal: '%s' is not available" % GIT, file=sys.stderr)
    print('fatal: %s' % e, file=sys.stderr)
    print(file=sys.stderr)
    print('Please make sure %s is installed and in your path.' % GIT,
          file=sys.stderr)
    raise CloneFailure()
  if proc.wait() != 0:
    print('fatal: could not create %s' % local, file=sys.stderr)
    raise CloneFailure()

  _InitHttp()
  _SetConfig(local, 'remote.origin.url', url)
  _SetConfig(local,
             'remote.origin.fetch',
             '+refs/heads/*:refs/remotes/origin/*')
  if clone_bundle and _DownloadBundle(url, local, quiet):
    _ImportBundle(local)
  _Fetch(url, local, 'origin', quiet)


def _Verify(cwd, branch, quiet):
  """Verify the branch has been signed by a tag.
  """
  cmd = [GIT, 'describe', 'origin/%s' % branch]
  proc = subprocess.Popen(cmd,
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE,
                          cwd=cwd)
  cur = proc.stdout.read().strip().decode('utf-8')
  proc.stdout.close()

  proc.stderr.read()
  proc.stderr.close()

  if proc.wait() != 0 or not cur:
    print(file=sys.stderr)
    print("fatal: branch '%s' has not been signed" % branch, file=sys.stderr)
    raise CloneFailure()

  m = re.compile(r'^(.*)-[0-9]{1,}-g[0-9a-f]{1,}$').match(cur)
  if m:
    cur = m.group(1)
    if not quiet:
      print(file=sys.stderr)
      print("info: Ignoring branch '%s'; using tagged release '%s'"
            % (branch, cur), file=sys.stderr)
      print(file=sys.stderr)

  env = os.environ.copy()
  try:
    env['GNUPGHOME'] = gpg_dir
  except UnicodeEncodeError:
    env['GNUPGHOME'] = gpg_dir.encode()

  cmd = [GIT, 'tag', '-v', cur]
  proc = subprocess.Popen(cmd,
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE,
                          cwd=cwd,
                          env=env)
  out = proc.stdout.read().decode('utf-8')
  proc.stdout.close()

  err = proc.stderr.read().decode('utf-8')
  proc.stderr.close()

  if proc.wait() != 0:
    print(file=sys.stderr)
    print(out, file=sys.stderr)
    print(err, file=sys.stderr)
    print(file=sys.stderr)
    raise CloneFailure()
  return '%s^0' % cur


def _Checkout(cwd, branch, rev, quiet):
  """Checkout an upstream branch into the repository and track it.
  """
  cmd = [GIT, 'update-ref', 'refs/heads/default', rev]
  if subprocess.Popen(cmd, cwd=cwd).wait() != 0:
    raise CloneFailure()

  _SetConfig(cwd, 'branch.default.remote', 'origin')
  _SetConfig(cwd, 'branch.default.merge', 'refs/heads/%s' % branch)

  cmd = [GIT, 'symbolic-ref', 'HEAD', 'refs/heads/default']
  if subprocess.Popen(cmd, cwd=cwd).wait() != 0:
    raise CloneFailure()

  cmd = [GIT, 'read-tree', '--reset', '-u']
  if not quiet:
    cmd.append('-v')
  cmd.append('HEAD')
  if subprocess.Popen(cmd, cwd=cwd).wait() != 0:
    raise CloneFailure()


def _FindRepo():
  """Look for a repo installation, starting at the current directory.
  """
  curdir = os.getcwd()
  repo = None

  olddir = None
  while curdir != '/' \
          and curdir != olddir \
          and not repo:
    repo = os.path.join(curdir, repodir, REPO_MAIN)
    if not os.path.isfile(repo):
      repo = None
      olddir = curdir
      curdir = os.path.dirname(curdir)
  return (repo, os.path.join(curdir, repodir))


class _Options(object):
  help = False


def _ParseArguments(args):
  cmd = None
  opt = _Options()
  arg = []

  for i in range(len(args)):
    a = args[i]
    if a == '-h' or a == '--help':
      opt.help = True

    elif not a.startswith('-'):
      cmd = a
      arg = args[i + 1:]
      break
  return cmd, opt, arg


def _Usage():
  gitc_usage = ""
  if get_gitc_manifest_dir():
    gitc_usage = "  gitc-init Initialize a GITC Client.\n"

  print(
      """usage: repo COMMAND [ARGS]

repo is not yet installed.  Use "repo init" to install it here.

The most commonly used repo commands are:

  init      Install repo in the current working directory
""" + gitc_usage +
      """  help      Display detailed help on a command

For access to the full online help, install repo ("repo init").
""")
  sys.exit(0)


def _Help(args):
  if args:
    if args[0] == 'init':
      init_optparse.print_help()
      sys.exit(0)
    elif args[0] == 'gitc-init':
      _GitcInitOptions(init_optparse)
      init_optparse.print_help()
      sys.exit(0)
    else:
      print("error: '%s' is not a bootstrap command.\n"
            '        For access to online help, install repo ("repo init").'
            % args[0], file=sys.stderr)
  else:
    _Usage()
  sys.exit(1)


def _NotInstalled():
  print('error: repo is not installed.  Use "repo init" to install it here.',
        file=sys.stderr)
  sys.exit(1)


def _NoCommands(cmd):
  print("""error: command '%s' requires repo to be installed first.
        Use "repo init" to install it here.""" % cmd, file=sys.stderr)
  sys.exit(1)


def _RunSelf(wrapper_path):
  my_dir = os.path.dirname(wrapper_path)
  my_main = os.path.join(my_dir, 'main.py')
  my_git = os.path.join(my_dir, '.git')

  if os.path.isfile(my_main) and os.path.isdir(my_git):
    for name in ['git_config.py',
                 'project.py',
                 'subcmds']:
      if not os.path.exists(os.path.join(my_dir, name)):
        return None, None
    return my_main, my_git
  return None, None


def _SetDefaultsTo(gitdir):
  global REPO_URL
  global REPO_REV

  REPO_URL = gitdir
  proc = subprocess.Popen([GIT,
                           '--git-dir=%s' % gitdir,
                           'symbolic-ref',
                           'HEAD'],
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
  REPO_REV = proc.stdout.read().strip().decode('utf-8')
  proc.stdout.close()

  proc.stderr.read()
  proc.stderr.close()

  if proc.wait() != 0:
    print('fatal: %s has no current branch' % gitdir, file=sys.stderr)
    sys.exit(1)


def main(orig_args):
  cmd, opt, args = _ParseArguments(orig_args)

  repo_main, rel_repo_dir = None, None
  # Don't use the local repo copy, make sure to switch to the gitc client first.
  if cmd != 'gitc-init':
    repo_main, rel_repo_dir = _FindRepo()

  wrapper_path = os.path.abspath(__file__)
  my_main, my_git = _RunSelf(wrapper_path)

  cwd = os.getcwd()
  if get_gitc_manifest_dir() and cwd.startswith(get_gitc_manifest_dir()):
    print('error: repo cannot be used in the GITC local manifest directory.'
          '\nIf you want to work on this GITC client please rerun this '
          'command from the corresponding client under /gitc/',
          file=sys.stderr)
    sys.exit(1)
  if not repo_main:
    if opt.help:
      _Usage()
    if cmd == 'help':
      _Help(args)
    if not cmd:
      _NotInstalled()
    if cmd == 'init' or cmd == 'gitc-init':
      if my_git:
        _SetDefaultsTo(my_git)
      try:
        _Init(args, gitc_init=(cmd == 'gitc-init'))
      except CloneFailure:
        path = os.path.join(repodir, S_repo)
        print("fatal: cloning the git-repo repository failed, will remove "
              "'%s' " % path, file=sys.stderr)
        shutil.rmtree(path, ignore_errors=True)
        sys.exit(1)
      repo_main, rel_repo_dir = _FindRepo()
    else:
      _NoCommands(cmd)

  if my_main:
    repo_main = my_main

  ver_str = '.'.join(map(str, VERSION))
  me = [sys.executable, repo_main,
        '--repo-dir=%s' % rel_repo_dir,
        '--wrapper-version=%s' % ver_str,
        '--wrapper-path=%s' % wrapper_path,
        '--']
  me.extend(orig_args)
  me.extend(extra_args)
  try:
    if platform.system() == "Windows":
      sys.exit(subprocess.call(me))
    else:
      os.execv(sys.executable, me)
  except OSError as e:
    print("fatal: unable to start %s" % repo_main, file=sys.stderr)
    print("fatal: %s" % e, file=sys.stderr)
    sys.exit(148)


if __name__ == '__main__':
  main(sys.argv[1:])