repo

#!/usr/bin/env python

# repo default configuration
#
import os
REPO_URL = os.environ.get('REPO_URL', None)
if not REPO_URL:
  REPO_URL = 'https://chromium.googlesource.com/external/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, 25)

# increment this if the MAINTAINER_KEYS block is modified
KEYRING_VERSION = (1, 5)

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

     Repo Maintainer <repo@android.kernel.org>
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-----END PGP PUBLIC KEY BLOCK-----

     Conley Owens <cco3@android.com>
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     Stefan Zager <szager@chromium.org>
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     David James <davidjames@google.com>
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     Mike Frysinger <vapier@chromium.org>
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CgkQQWM7n+g39YF9ABAAmFSp2SbJg48Q7wkHJuryOwseP1incEE6iTMjvpWLmaoM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=
=i88c
-----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 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


def _print(*objects, **kwargs):
  sep = kwargs.get('sep', ' ')
  end = kwargs.get('end', '\n')
  out = kwargs.get('file', sys.stdout)
  out.write(sep.join(objects) + end)


# 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('--depth', type='int', default=None,
                 dest='depth',
                 help='create a shallow clone with given depth; see git clone')
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 not os.path.isfile('%s/repo' % dst):
      _print("warning: '%s' does not look like a git-repo repository, is "
             "REPO_URL set correctly?" % url, file=sys.stderr)

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


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

  num_ver_str = ver_str[len('git version '):].strip().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)
  return tuple(to_tuple)


def _CheckGitVersion():
  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 CloneFailure()

  ver_str = proc.stdout.read().strip()
  proc.stdout.close()
  proc.wait()

  ver_act = ParseGitVersion(ver_str)
  if ver_act is None:
    _print('error: "%s" unsupported' % ver_str, 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)
  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:  # pylint: disable=bare-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:
    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 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()
  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()
  proc.stdout.close()

  err = proc.stderr.read()
  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").
""", file=sys.stderr)
  sys.exit(1)


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()
  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__':
  if ver[0] == 3:
    _print('warning: Python 3 support is currently experimental. YMMV.\n'
           'Please use Python 2.7 instead.',
           file=sys.stderr)
  main(sys.argv[1:])