command.py
class MirrorSafeCommand(object):
  """Command permits itself to run within a mirror,
     and does not require a working directory.
  """
error.py
class ManifestParseError(Exception):
  """Failed to parse the manifest file.
  """
git_config.py
class RepoConfig(GitConfig):
  """User settings for repo itself."""

  _USER_CONFIG = '~/.repoconfig/config'
manifest_xml.py
class GitcClient(RepoClient, GitcManifest):
  """Manages a GitC client checkout."""

  def __init__(self, repodir, gitc_client_name):
    """Initialize the GitcManifest object."""
    self.gitc_client_name = gitc_client_name
    self.gitc_client_dir = os.path.join(gitc_utils.get_gitc_manifest_dir(),
                                        gitc_client_name)

    super().__init__(repodir, os.path.join(self.gitc_client_dir, '.manifest'))
    self.isGitcClient = True
error.py
class RepoChangedException(Exception):
  """Thrown if 'repo sync' results in repo updating its internal
     repo or manifest repositories.  In this special case we must
     use exec to re-execute repo with the new code and manifest.
  """

  def __init__(self, extra_args=None):
    super().__init__(extra_args)
    self.extra_args = extra_args or []
git_command.py
GIT = 'git'
MIN_GIT_VERSION_SOFT = (1, 9, 1)
MIN_GIT_VERSION_HARD = (1, 7, 2)
GIT_DIR = 'GIT_DIR'
LAST_GITDIR = None
LAST_CWD = None
        LAST_CWD = cwd
        LAST_GITDIR = env[GIT_DIR]
class _GitCall(object):
class UserAgent(object):
class GitCommand(object):
  def version_tuple(self):
  def __getattr__(self, name):
    def fun(*cmdv):
def RepoSourceVersion():
  def os(self):
  def repo(self):
  def git(self):
def git_require(min_version, fail=False, msg=''):
  def __init__(self,
               project,
               cmdv,
               bare=False,
               input=None,
               capture_stdout=False,
               capture_stderr=False,
               merge_output=False,
               disable_editor=False,
               ssh_proxy=None,
               cwd=None,
               gitdir=None,
               objdir=None):
  def _GetBasicEnv():
  def Wait(self):
command.py
class GitcAvailableCommand(object):
  """Command that requires GITC to be available, but does
     not require the local client to be a GITC client.
  """
error.py
class InvalidProjectGroupsError(Exception):
  """A specified project is not suitable for the specified groups
  """

  def __init__(self, name=None):
    super().__init__(name)
    self.name = name

  def __str__(self):
    if self.name is None:
      return 'in current directory'
    return self.name
command.py
class GitcClientCommand(object):
  """Command that requires the local client to be a GITC
     client.
  """
manifest_xml.py
class RepoClient(XmlManifest):
  """Manages a repo client checkout."""

  def __init__(self, repodir, manifest_file=None, submanifest_path='', **kwargs):
    self.isGitcClient = False
    submanifest_path = submanifest_path or ''
    if submanifest_path:
      self._CheckLocalPath(submanifest_path)
      prefix = os.path.join(repodir, SUBMANIFEST_DIR, submanifest_path)
    else:
      prefix = repodir

    if os.path.exists(os.path.join(prefix, LOCAL_MANIFEST_NAME)):
      print('error: %s is not supported; put local manifests in `%s` instead' %
            (LOCAL_MANIFEST_NAME, os.path.join(prefix, LOCAL_MANIFESTS_DIR_NAME)),
            file=sys.stderr)
      sys.exit(1)

    if manifest_file is None:
        manifest_file = os.path.join(prefix, MANIFEST_FILE_NAME)
    local_manifests = os.path.abspath(os.path.join(prefix, LOCAL_MANIFESTS_DIR_NAME))
    super().__init__(repodir, manifest_file, local_manifests,
                     submanifest_path=submanifest_path, **kwargs)

    # TODO: Completely separate manifest logic out of the client.
    self.manifest = self
error.py
class ManifestInvalidRevisionError(ManifestParseError):
  """The revision value in a project is incorrect.
  """
git_trace2_event_log.py
class EventLog(object):
  """Event log that records events that occurred during a repo invocation.

  Events are written to the log as a consecutive JSON entries, one per line.
  Entries follow the git trace2 EVENT format.

  Each entry contains the following common keys:
  - event: The event name
  - sid: session-id - Unique string to allow process instance to be identified.
  - thread: The thread name.
  - time: is the UTC time of the event.

  Valid 'event' names and event specific fields are documented here:
  https://git-scm.com/docs/api-trace2#_event_format
  """

  def __init__(self, env=None):
    """Initializes the event log."""
    self._log = []
    # Try to get session-id (sid) from environment (setup in repo launcher).
    KEY = 'GIT_TRACE2_PARENT_SID'
    if env is None:
      env = os.environ

    now = datetime.datetime.utcnow()

    # Save both our sid component and the complete sid.
    # We use our sid component (self._sid) as the unique filename prefix and
    # the full sid (self._full_sid) in the log itself.
    self._sid = 'repo-%s-P%08x' % (now.strftime('%Y%m%dT%H%M%SZ'), os.getpid())
    parent_sid = env.get(KEY)
    # Append our sid component to the parent sid (if it exists).
    if parent_sid is not None:
      self._full_sid = parent_sid + '/' + self._sid
    else:
      self._full_sid = self._sid

    # Set/update the environment variable.
    # Environment handling across systems is messy.
    try:
      env[KEY] = self._full_sid
    except UnicodeEncodeError:
      env[KEY] = self._full_sid.encode()

    # Add a version event to front of the log.
    self._AddVersionEvent()

  @property
  def full_sid(self):
    return self._full_sid

  def _AddVersionEvent(self):
    """Adds a 'version' event at the beginning of current log."""
    version_event = self._CreateEventDict('version')
    version_event['evt'] = "2"
    version_event['exe'] = RepoSourceVersion()
    self._log.insert(0, version_event)

  def _CreateEventDict(self, event_name):
    """Returns a dictionary with the common keys/values for git trace2 events.

    Args:
      event_name: The event name.

    Returns:
      Dictionary with the common event fields populated.
    """
    return {
        'event': event_name,
        'sid': self._full_sid,
        'thread': threading.currentThread().getName(),
        'time': datetime.datetime.utcnow().isoformat() + 'Z',
    }

  def StartEvent(self):
    """Append a 'start' event to the current log."""
    start_event = self._CreateEventDict('start')
    start_event['argv'] = sys.argv
    self._log.append(start_event)

  def ExitEvent(self, result):
    """Append an 'exit' event to the current log.

    Args:
      result: Exit code of the event
    """
    exit_event = self._CreateEventDict('exit')

    # Consider 'None' success (consistent with event_log result handling).
    if result is None:
      result = 0
    exit_event['code'] = result
    self._log.append(exit_event)

  def CommandEvent(self, name, subcommands):
    """Append a 'command' event to the current log.

    Args:
      name: Name of the primary command (ex: repo, git)
      subcommands: List of the sub-commands (ex: version, init, sync)
    """
    command_event = self._CreateEventDict('command')
    command_event['name'] = name
    command_event['subcommands'] = subcommands
    self._log.append(command_event)

  def LogConfigEvents(self, config, event_dict_name):
    """Append a |event_dict_name| event for each config key in |config|.

    Args:
      config: Configuration dictionary.
      event_dict_name: Name of the event dictionary for items to be logged under.
    """
    for param, value in config.items():
      event = self._CreateEventDict(event_dict_name)
      event['param'] = param
      event['value'] = value
      self._log.append(event)

  def DefParamRepoEvents(self, config):
    """Append a 'def_param' event for each repo.* config key to the current log.

    Args:
      config: Repo configuration dictionary
    """
    # Only output the repo.* config parameters.
    repo_config = {k: v for k, v in config.items() if k.startswith('repo.')}
    self.LogConfigEvents(repo_config, 'def_param')

  def GetDataEventName(self, value):
    """Returns 'data-json' if the value is an array else returns 'data'."""
    return 'data-json' if value[0] == '[' and value[-1] == ']' else 'data'

  def LogDataConfigEvents(self, config, prefix):
    """Append a 'data' event for each config key/value in |config| to the current log.

    For each keyX and valueX of the config, "key" field of the event is '|prefix|/keyX'
    and the "value" of the "key" field is valueX.

    Args:
      config: Configuration dictionary.
      prefix: Prefix for each key that is logged.
    """
    for key, value in config.items():
      event = self._CreateEventDict(self.GetDataEventName(value))
      event['key'] = f'{prefix}/{key}'
      event['value'] = value
      self._log.append(event)

  def ErrorEvent(self, msg, fmt):
    """Append a 'error' event to the current log."""
    error_event = self._CreateEventDict('error')
    error_event['msg'] = msg
    error_event['fmt'] = fmt
    self._log.append(error_event)

  def _GetEventTargetPath(self):
    """Get the 'trace2.eventtarget' path from git configuration.

    Returns:
      path: git config's 'trace2.eventtarget' path if it exists, or None
    """
    path = None
    cmd = ['config', '--get', 'trace2.eventtarget']
    # TODO(https://crbug.com/gerrit/13706): Use GitConfig when it supports
    # system git config variables.
    p = GitCommand(None, cmd, capture_stdout=True, capture_stderr=True,
                   bare=True)
    retval = p.Wait()
    if retval == 0:
      # Strip trailing carriage-return in path.
      path = p.stdout.rstrip('\n')
    elif retval != 1:
      # `git config --get` is documented to produce an exit status of `1` if
      # the requested variable is not present in the configuration. Report any
      # other return value as an error.
      print("repo: error: 'git config --get' call failed with return code: %r, stderr: %r" % (
          retval, p.stderr), file=sys.stderr)
    return path

  def Write(self, path=None):
    """Writes the log out to a file.

    Log is only written if 'path' or 'git config --get trace2.eventtarget'
    provide a valid path to write logs to.

    Logging filename format follows the git trace2 style of being a unique
    (exclusive writable) file.

    Args:
      path: Path to where logs should be written.

    Returns:
      log_path: Path to the log file if log is written, otherwise None
    """
    log_path = None
    # If no logging path is specified, get the path from 'trace2.eventtarget'.
    if path is None:
      path = self._GetEventTargetPath()

    # If no logging path is specified, exit.
    if path is None:
      return None

    if isinstance(path, str):
      # Get absolute path.
      path = os.path.abspath(os.path.expanduser(path))
    else:
      raise TypeError('path: str required but got %s.' % type(path))

    # Git trace2 requires a directory to write log to.

    # TODO(https://crbug.com/gerrit/13706): Support file (append) mode also.
    if not os.path.isdir(path):
      return None
    # Use NamedTemporaryFile to generate a unique filename as required by git trace2.
    try:
      with tempfile.NamedTemporaryFile(mode='x', prefix=self._sid, dir=path,
                                       delete=False) as f:
        # TODO(https://crbug.com/gerrit/13706): Support writing events as they
        # occur.
        for e in self._log:
          # Dump in compact encoding mode.
          # See 'Compact encoding' in Python docs:
          # https://docs.python.org/3/library/json.html#module-json
          json.dump(e, f, indent=None, separators=(',', ':'))
          f.write('\n')
        log_path = f.name
    except FileExistsError as err:
      print('repo: warning: git trace2 logging failed: %r' % err,
            file=sys.stderr)
      return None
    return log_path
error.py
class DownloadError(Exception):
  """Cannot download a repository.
  """

  def __init__(self, reason):
    super().__init__(reason)
    self.reason = reason

  def __str__(self):
    return self.reason
subcmds/version.py
class Version(Command, MirrorSafeCommand):
  wrapper_version = None
  wrapper_path = None

  COMMON = False
  helpSummary = "Display the version of repo"
  helpUsage = """
%prog
"""

  def Execute(self, opt, args):
    rp = self.manifest.repoProject
    rem = rp.GetRemote(rp.remote.name)
    branch = rp.GetBranch('default')

    # These might not be the same.  Report them both.
    src_ver = RepoSourceVersion()
    rp_ver = rp.bare_git.describe(HEAD)
    print('repo version %s' % rp_ver)
    print('       (from %s)' % rem.url)
    print('       (tracking %s)' % branch.merge)
    print('       (%s)' % rp.bare_git.log('-1', '--format=%cD', HEAD))

    if self.wrapper_path is not None:
      print('repo launcher version %s' % self.wrapper_version)
      print('       (from %s)' % self.wrapper_path)

      if src_ver != rp_ver:
        print('       (currently at %s)' % src_ver)

    print('repo User-Agent %s' % user_agent.repo)
    print('git %s' % git.version_tuple().full)
    print('git User-Agent %s' % user_agent.git)
    print('Python %s' % sys.version)
    uname = platform.uname()
    if sys.version_info.major < 3:
      # Python 3 returns a named tuple, but Python 2 is simpler.
      print(uname)
    else:
      print('OS %s %s (%s)' % (uname.system, uname.release, uname.version))
      print('CPU %s (%s)' %
            (uname.machine, uname.processor if uname.processor else 'unknown'))
    print('Bug reports:', Wrapper().BUG_URL)
command.py
class InteractiveCommand(Command):
  """Command which requires user interaction on the tty and
     must not run within a pager, even if the user asks to.
  """

  def WantPager(self, _opt):
    return False
error.py
class NoSuchProjectError(Exception):
  """A specified project does not exist in the work tree.
  """

  def __init__(self, name=None):
    super().__init__(name)
    self.name = name

  def __str__(self):
    if self.name is None:
      return 'in current directory'
    return self.name
error.py
class NoManifestException(Exception):
  """The required manifest does not exist.
  """

  def __init__(self, path, reason):
    super().__init__(path, reason)
    self.path = path
    self.reason = reason

  def __str__(self):
    return self.reason


Question: import getpass
import netrc
import optparse
import os
import shlex
import sys
import textwrap
import time
import urllib.request
  import kerberos
import event_log
import gitc_utils
      import trace
from color import SetDefaultColoring
from repo_trace import SetTrace
from git_command import user_agent
from git_config import RepoConfig
from git_trace2_event_log import EventLog
from command import InteractiveCommand
from command import MirrorSafeCommand
from command import GitcAvailableCommand, GitcClientCommand
from subcmds.version import Version
from editor import Editor
from error import DownloadError
from error import InvalidProjectGroupsError
from error import ManifestInvalidRevisionError
from error import ManifestParseError
from error import NoManifestException
from error import NoSuchProjectError
from error import RepoChangedException
from manifest_xml import GitcClient, RepoClient
from pager import RunPager, TerminatePager
from wrapper import WrapperPath, Wrapper
from subcmds import all_commands
                          help='display command output in the pager')
global_options.add_option('--no-pager',
                          dest='pager', action='store_false',
                          help='disable the pager')
global_options.add_option('--color',
                          choices=('auto', 'always', 'never'), default=None,
                          help='control color usage: auto, always, never')
global_options.add_option('--trace',
                          dest='trace', action='store_true',
                          help='trace git command execution (REPO_TRACE=1)')
global_options.add_option('--trace-python',
                          dest='trace_python', action='store_true',
                          help='trace python command execution')
global_options.add_option('--time',
                          dest='time', action='store_true',
                          help='time repo command execution')
global_options.add_option('--version',
                          dest='show_version', action='store_true',
                          help='display this version of repo')
global_options.add_option('--show-toplevel',
                          action='store_true',
                          help='display the path of the top-level directory of '
                               'the repo client checkout')
global_options.add_option('--event-log',
                          dest='event_log', action='store',
                          help='filename of event log to append timeline to')
global_options.add_option('--git-trace2-event-log', action='store',
                          help='directory to write git trace2 event log to')
global_options.add_option('--submanifest-path', action='store',
                          metavar='REL_PATH', help='submanifest path')


class _Repo(object):
  def __init__(self, repodir):
    self.repodir = repodir
    self.commands = all_commands

  def _PrintHelp(self, short: bool = False, all_commands: bool = False):
    """Show --help screen."""
    global_options.print_help()
    print()
    if short:
      commands = ' '.join(sorted(self.commands))
      wrapped_commands = textwrap.wrap(commands, width=77)
      print('Available commands:\n  %s' % ('\n  '.join(wrapped_commands),))
      print('\nRun `repo help <command>` for command-specific details.')
      print('Bug reports:', Wrapper().BUG_URL)
    else:
      cmd = self.commands['help']()
      if all_commands:
        cmd.PrintAllCommandsBody()
      else:
        cmd.PrintCommonCommandsBody()

  def _ParseArgs(self, argv):
    """Parse the main `repo` command line options."""
    for i, arg in enumerate(argv):
      if not arg.startswith('-'):
        name = arg
        glob = argv[:i]
        argv = argv[i + 1:]
        break
    else:
      name = None
      glob = argv
      argv = []
    gopts, _gargs = global_options.parse_args(glob)

    if name:
      name, alias_args = self._ExpandAlias(name)
      argv = alias_args + argv

    return (name, gopts, argv)

  def _ExpandAlias(self, name):
    """Look up user registered aliases."""
    # We don't resolve aliases for existing subcommands.  This matches git.
    if name in self.commands:
      return name, []

    key = 'alias.%s' % (name,)
    alias = RepoConfig.ForRepository(self.repodir).GetString(key)
    if alias is None:
      alias = RepoConfig.ForUser().GetString(key)
    if alias is None:
      return name, []

    args = alias.strip().split(' ', 1)
    name = args[0]
    if len(args) == 2:
      args = shlex.split(args[1])
    else:
      args = []
    return name, args

  def _Run(self, name, gopts, argv):
    """Execute the requested subcommand."""
    result = 0

    if gopts.trace:
      SetTrace()

    # Handle options that terminate quickly first.
    if gopts.help or gopts.help_all:
      self._PrintHelp(short=False, all_commands=gopts.help_all)
      return 0
    elif gopts.show_version:
      # Always allow global --version regardless of subcommand validity.
      name = 'version'
    elif gopts.show_toplevel:
      print(os.path.dirname(self.repodir))
      return 0
    elif not name:
      # No subcommand specified, so show the help/subcommand.
      self._PrintHelp(short=True)
      return 1

    SetDefaultColoring(gopts.color)

    git_trace2_event_log = EventLog()

Answer:     outer_client = RepoClient(self.repodir)