Fix licensing headers and move most third party code to third_party/...

upload.py

Index: upload.py
===================================================================
--- upload.py	(revision 37929)
+++ upload.py	(working copy)
@@ -1,1569 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 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.
-
-"""Tool for uploading diffs from a version control system to the codereview app.
-
-Usage summary: upload.py [options] [-- diff_options]
-
-Diff options are passed to the diff command of the underlying system.
-
-Supported version control systems:
-  Git
-  Mercurial
-  Subversion
-
-It is important for Git/Mercurial users to specify a tree/node/branch to diff
-against by using the '--rev' option.
-"""
-# This code is derived from appcfg.py in the App Engine SDK (open source),
-# and from ASPN recipe #146306.
-
-import cookielib
-import getpass
-import logging
-import mimetypes
-import optparse
-import os
-import re
-import socket
-import subprocess
-import sys
-import urllib
-import urllib2
-import urlparse
-
-# The md5 module was deprecated in Python 2.5.
-try:
-  from hashlib import md5
-except ImportError:
-  from md5 import md5
-
-try:
-  import readline
-except ImportError:
-  pass
-
-# The logging verbosity:
-#  0: Errors only.
-#  1: Status messages.
-#  2: Info logs.
-#  3: Debug logs.
-verbosity = 1
-
-# Max size of patch or base file.
-MAX_UPLOAD_SIZE = 900 * 1024
-
-# Constants for version control names.  Used by GuessVCSName.
-VCS_GIT = "Git"
-VCS_MERCURIAL = "Mercurial"
-VCS_SUBVERSION = "Subversion"
-VCS_UNKNOWN = "Unknown"
-
-# whitelist for non-binary filetypes which do not start with "text/"
-# .mm (Objective-C) shows up as application/x-freemind on my Linux box.
-TEXT_MIMETYPES = ['application/javascript', 'application/x-javascript',
-                  'application/x-freemind']
-
-VCS_ABBREVIATIONS = {
-  VCS_MERCURIAL.lower(): VCS_MERCURIAL,
-  "hg": VCS_MERCURIAL,
-  VCS_SUBVERSION.lower(): VCS_SUBVERSION,
-  "svn": VCS_SUBVERSION,
-  VCS_GIT.lower(): VCS_GIT,
-}
-
-
-def GetEmail(prompt):
-  """Prompts the user for their email address and returns it.
-
-  The last used email address is saved to a file and offered up as a suggestion
-  to the user. If the user presses enter without typing in anything the last
-  used email address is used. If the user enters a new address, it is saved
-  for next time we prompt.
-
-  """
-  last_email_file_name = os.path.expanduser("~/.last_codereview_email_address")
-  last_email = ""
-  if os.path.exists(last_email_file_name):
-    try:
-      last_email_file = open(last_email_file_name, "r")
-      last_email = last_email_file.readline().strip("\n")
-      last_email_file.close()
-      prompt += " [%s]" % last_email
-    except IOError, e:
-      pass
-  email = raw_input(prompt + ": ").strip()
-  if email:
-    try:
-      last_email_file = open(last_email_file_name, "w")
-      last_email_file.write(email)
-      last_email_file.close()
-    except IOError, e:
-      pass
-  else:
-    email = last_email
-  return email
-
-
-def StatusUpdate(msg):
-  """Print a status message to stdout.
-
-  If 'verbosity' is greater than 0, print the message.
-
-  Args:
-    msg: The string to print.
-  """
-  if verbosity > 0:
-    print msg
-
-
-def ErrorExit(msg):
-  """Print an error message to stderr and exit."""
-  print >>sys.stderr, msg
-  sys.exit(1)
-
-
-class ClientLoginError(urllib2.HTTPError):
-  """Raised to indicate there was an error authenticating with ClientLogin."""
-
-  def __init__(self, url, code, msg, headers, args):
-    urllib2.HTTPError.__init__(self, url, code, msg, headers, None)
-    self.args = args
-    self.reason = args["Error"]
-
-
-class AbstractRpcServer(object):
-  """Provides a common interface for a simple RPC server."""
-
-  def __init__(self, host, auth_function, host_override=None, extra_headers={},
-               save_cookies=False):
-    """Creates a new HttpRpcServer.
-
-    Args:
-      host: The host to send requests to.
-      auth_function: A function that takes no arguments and returns an
-        (email, password) tuple when called. Will be called if authentication
-        is required.
-      host_override: The host header to send to the server (defaults to host).
-      extra_headers: A dict of extra headers to append to every request.
-      save_cookies: If True, save the authentication cookies to local disk.
-        If False, use an in-memory cookiejar instead.  Subclasses must
-        implement this functionality.  Defaults to False.
-    """
-    self.host = host
-    self.host_override = host_override
-    self.auth_function = auth_function
-    self.authenticated = False
-    self.extra_headers = extra_headers
-    self.save_cookies = save_cookies
-    self.opener = self._GetOpener()
-    if self.host_override:
-      logging.info("Server: %s; Host: %s", self.host, self.host_override)
-    else:
-      logging.info("Server: %s", self.host)
-
-  def _GetOpener(self):
-    """Returns an OpenerDirector for making HTTP requests.
-
-    Returns:
-      A urllib2.OpenerDirector object.
-    """
-    raise NotImplementedError()
-
-  def _CreateRequest(self, url, data=None):
-    """Creates a new urllib request."""
-    logging.debug("Creating request for: '%s' with payload:\n%s", url, data)
-    req = urllib2.Request(url, data=data)
-    if self.host_override:
-      req.add_header("Host", self.host_override)
-    for key, value in self.extra_headers.iteritems():
-      req.add_header(key, value)
-    return req
-
-  def _GetAuthToken(self, email, password):
-    """Uses ClientLogin to authenticate the user, returning an auth token.
-
-    Args:
-      email:    The user's email address
-      password: The user's password
-
-    Raises:
-      ClientLoginError: If there was an error authenticating with ClientLogin.
-      HTTPError: If there was some other form of HTTP error.
-
-    Returns:
-      The authentication token returned by ClientLogin.
-    """
-    account_type = "GOOGLE"
-    req = self._CreateRequest(
-        url="https://www.google.com/accounts/ClientLogin",
-        data=urllib.urlencode({
-            "Email": email,
-            "Passwd": password,
-            "service": "ah",
-            "source": "rietveld-codereview-upload",
-            "accountType": account_type,
-        }),
-    )
-    try:
-      response = self.opener.open(req)
-      response_body = response.read()
-      response_dict = dict(x.split("=")
-                           for x in response_body.split("\n") if x)
-      return response_dict["Auth"]
-    except urllib2.HTTPError, e:
-      if e.code == 403:
-        # Try a temporary workaround.
-        if self.host.endswith(".google.com"):
-          account_type = "HOSTED"
-          req = self._CreateRequest(
-                  url="https://www.google.com/accounts/ClientLogin",
-                  data=urllib.urlencode({
-                      "Email": email,
-                      "Passwd": password,
-                      "service": "ah",
-                      "source": "rietveld-codereview-upload",
-                      "accountType": account_type,
-                  }),
-              )
-          try:
-            response = self.opener.open(req)
-            response_body = response.read()
-            response_dict = dict(x.split("=")
-                                 for x in response_body.split("\n") if x)
-            return response_dict["Auth"]
-          except urllib2.HTTPError, e:
-            if e.code == 403:
-              body = e.read()
-              response_dict = dict(x.split("=", 1) for x in body.split("\n")
-                                   if x)
-              raise ClientLoginError(req.get_full_url(), e.code, e.msg,
-                                     e.headers, response_dict)
-            else:
-              raise
-
-        body = e.read()
-        response_dict = dict(x.split("=", 1) for x in body.split("\n") if x)
-        raise ClientLoginError(req.get_full_url(), e.code, e.msg,
-                               e.headers, response_dict)
-      else:
-        raise
-
-  def _GetAuthCookie(self, auth_token):
-    """Fetches authentication cookies for an authentication token.
-
-    Args:
-      auth_token: The authentication token returned by ClientLogin.
-
-    Raises:
-      HTTPError: If there was an error fetching the authentication cookies.
-    """
-    # This is a dummy value to allow us to identify when we're successful.
-    continue_location = "http://localhost/"
-    args = {"continue": continue_location, "auth": auth_token}
-    req = self._CreateRequest("http://%s/_ah/login?%s" %
-                              (self.host, urllib.urlencode(args)))
-    try:
-      response = self.opener.open(req)
-    except urllib2.HTTPError, e:
-      response = e
-    if (response.code != 302 or
-        response.info()["location"] != continue_location):
-      raise urllib2.HTTPError(req.get_full_url(), response.code, response.msg,
-                              response.headers, response.fp)
-    self.authenticated = True
-
-  def _Authenticate(self):
-    """Authenticates the user.
-
-    The authentication process works as follows:
-     1) We get a username and password from the user
-     2) We use ClientLogin to obtain an AUTH token for the user
-        (see http://code.google.com/apis/accounts/AuthForInstalledApps.html).
-     3) We pass the auth token to /_ah/login on the server to obtain an
-        authentication cookie. If login was successful, it tries to redirect
-        us to the URL we provided.
-
-    If we attempt to access the upload API without first obtaining an
-    authentication cookie, it returns a 401 response (or a 302) and
-    directs us to authenticate ourselves with ClientLogin.
-    """
-    for i in range(3):
-      credentials = self.auth_function()
-      try:
-        auth_token = self._GetAuthToken(credentials[0], credentials[1])
-      except ClientLoginError, e:
-        if e.reason == "BadAuthentication":
-          print >>sys.stderr, "Invalid username or password."
-          continue
-        if e.reason == "CaptchaRequired":
-          print >>sys.stderr, (
-              "Please go to\n"
-              "https://www.google.com/accounts/DisplayUnlockCaptcha\n"
-              "and verify you are a human.  Then try again.")
-          break
-        if e.reason == "NotVerified":
-          print >>sys.stderr, "Account not verified."
-          break
-        if e.reason == "TermsNotAgreed":
-          print >>sys.stderr, "User has not agreed to TOS."
-          break
-        if e.reason == "AccountDeleted":
-          print >>sys.stderr, "The user account has been deleted."
-          break
-        if e.reason == "AccountDisabled":
-          print >>sys.stderr, "The user account has been disabled."
-          break
-        if e.reason == "ServiceDisabled":
-          print >>sys.stderr, ("The user's access to the service has been "
-                               "disabled.")
-          break
-        if e.reason == "ServiceUnavailable":
-          print >>sys.stderr, "The service is not available; try again later."
-          break
-        raise
-      self._GetAuthCookie(auth_token)
-      return
-
-  def Send(self, request_path, payload=None,
-           content_type="application/octet-stream",
-           timeout=None,
-           **kwargs):
-    """Sends an RPC and returns the response.
-
-    Args:
-      request_path: The path to send the request to, eg /api/appversion/create.
-      payload: The body of the request, or None to send an empty request.
-      content_type: The Content-Type header to use.
-      timeout: timeout in seconds; default None i.e. no timeout.
-        (Note: for large requests on OS X, the timeout doesn't work right.)
-      kwargs: Any keyword arguments are converted into query string parameters.
-
-    Returns:
-      The response body, as a string.
-    """
-    # TODO: Don't require authentication.  Let the server say
-    # whether it is necessary.
-    if not self.authenticated:
-      self._Authenticate()
-
-    old_timeout = socket.getdefaulttimeout()
-    socket.setdefaulttimeout(timeout)
-    try:
-      tries = 0
-      while True:
-        tries += 1
-        args = dict(kwargs)
-        url = "http://%s%s" % (self.host, request_path)
-        if args:
-          url += "?" + urllib.urlencode(args)
-        req = self._CreateRequest(url=url, data=payload)
-        req.add_header("Content-Type", content_type)
-        try:
-          f = self.opener.open(req)
-          response = f.read()
-          f.close()
-          return response
-        except urllib2.HTTPError, e:
-          if tries > 3:
-            raise
-          elif e.code == 401 or e.code == 302:
-            self._Authenticate()
-##           elif e.code >= 500 and e.code < 600:
-##             # Server Error - try again.
-##             continue
-          else:
-            raise
-    finally:
-      socket.setdefaulttimeout(old_timeout)
-
-
-class HttpRpcServer(AbstractRpcServer):
-  """Provides a simplified RPC-style interface for HTTP requests."""
-
-  def _Authenticate(self):
-    """Save the cookie jar after authentication."""
-    super(HttpRpcServer, self)._Authenticate()
-    if self.save_cookies:
-      StatusUpdate("Saving authentication cookies to %s" % self.cookie_file)
-      self.cookie_jar.save()
-
-  def _GetOpener(self):
-    """Returns an OpenerDirector that supports cookies and ignores redirects.
-
-    Returns:
-      A urllib2.OpenerDirector object.
-    """
-    opener = urllib2.OpenerDirector()
-    opener.add_handler(urllib2.ProxyHandler())
-    opener.add_handler(urllib2.UnknownHandler())
-    opener.add_handler(urllib2.HTTPHandler())
-    opener.add_handler(urllib2.HTTPDefaultErrorHandler())
-    opener.add_handler(urllib2.HTTPSHandler())
-    opener.add_handler(urllib2.HTTPErrorProcessor())
-    if self.save_cookies:
-      self.cookie_file = os.path.expanduser("~/.codereview_upload_cookies")
-      self.cookie_jar = cookielib.MozillaCookieJar(self.cookie_file)
-      if os.path.exists(self.cookie_file):
-        try:
-          self.cookie_jar.load()
-          self.authenticated = True
-          StatusUpdate("Loaded authentication cookies from %s" %
-                       self.cookie_file)
-        except (cookielib.LoadError, IOError):
-          # Failed to load cookies - just ignore them.
-          pass
-      else:
-        # Create an empty cookie file with mode 600
-        fd = os.open(self.cookie_file, os.O_CREAT, 0600)
-        os.close(fd)
-      # Always chmod the cookie file
-      os.chmod(self.cookie_file, 0600)
-    else:
-      # Don't save cookies across runs of update.py.
-      self.cookie_jar = cookielib.CookieJar()
-    opener.add_handler(urllib2.HTTPCookieProcessor(self.cookie_jar))
-    return opener
-
-
-parser = optparse.OptionParser(usage="%prog [options] [-- diff_options]")
-parser.add_option("-y", "--assume_yes", action="store_true",
-                  dest="assume_yes", default=False,
-                  help="Assume that the answer to yes/no questions is 'yes'.")
-# Logging
-group = parser.add_option_group("Logging options")
-group.add_option("-q", "--quiet", action="store_const", const=0,
-                 dest="verbose", help="Print errors only.")
-group.add_option("-v", "--verbose", action="store_const", const=2,
-                 dest="verbose", default=1,
-                 help="Print info level logs (default).")
-group.add_option("--noisy", action="store_const", const=3,
-                 dest="verbose", help="Print all logs.")
-# Review server
-group = parser.add_option_group("Review server options")
-group.add_option("-s", "--server", action="store", dest="server",
-                 default="codereview.appspot.com",
-                 metavar="SERVER",
-                 help=("The server to upload to. The format is host[:port]. "
-                       "Defaults to '%default'."))
-group.add_option("-e", "--email", action="store", dest="email",
-                 metavar="EMAIL", default=None,
-                 help="The username to use. Will prompt if omitted.")
-group.add_option("-H", "--host", action="store", dest="host",
-                 metavar="HOST", default=None,
-                 help="Overrides the Host header sent with all RPCs.")
-group.add_option("--no_cookies", action="store_false",
-                 dest="save_cookies", default=True,
-                 help="Do not save authentication cookies to local disk.")
-# Issue
-group = parser.add_option_group("Issue options")
-group.add_option("-d", "--description", action="store", dest="description",
-                 metavar="DESCRIPTION", default=None,
-                 help="Optional description when creating an issue.")
-group.add_option("-f", "--description_file", action="store",
-                 dest="description_file", metavar="DESCRIPTION_FILE",
-                 default=None,
-                 help="Optional path of a file that contains "
-                      "the description when creating an issue.")
-group.add_option("-r", "--reviewers", action="store", dest="reviewers",
-                 metavar="REVIEWERS", default=None,
-                 help="Add reviewers (comma separated email addresses).")
-group.add_option("--cc", action="store", dest="cc",
-                 metavar="CC", default=None,
-                 help="Add CC (comma separated email addresses).")
-group.add_option("--private", action="store_true", dest="private",
-                 default=False,
-                 help="Make the issue restricted to reviewers and those CCed")
-# Upload options
-group = parser.add_option_group("Patch options")
-group.add_option("-m", "--message", action="store", dest="message",
-                 metavar="MESSAGE", default=None,
-                 help="A message to identify the patch. "
-                      "Will prompt if omitted.")
-group.add_option("-i", "--issue", type="int", action="store",
-                 metavar="ISSUE", default=None,
-                 help="Issue number to which to add. Defaults to new issue.")
-group.add_option("--download_base", action="store_true",
-                 dest="download_base", default=False,
-                 help="Base files will be downloaded by the server "
-                 "(side-by-side diffs may not work on files with CRs).")
-group.add_option("--rev", action="store", dest="revision",
-                 metavar="REV", default=None,
-                 help="Branch/tree/revision to diff against (used by DVCS).")
-group.add_option("--send_mail", action="store_true",
-                 dest="send_mail", default=False,
-                 help="Send notification email to reviewers.")
-group.add_option("--vcs", action="store", dest="vcs",
-                 metavar="VCS", default=None,
-                 help=("Version control system (optional, usually upload.py "
-                       "already guesses the right VCS)."))
-
-
-def GetRpcServer(options):
-  """Returns an instance of an AbstractRpcServer.
-
-  Returns:
-    A new AbstractRpcServer, on which RPC calls can be made.
-  """
-
-  rpc_server_class = HttpRpcServer
-
-  def GetUserCredentials():
-    """Prompts the user for a username and password."""
-    email = options.email
-    if email is None:
-      email = GetEmail("Email (login for uploading to %s)" % options.server)
-    password = getpass.getpass("Password for %s: " % email)
-    return (email, password)
-
-  # If this is the dev_appserver, use fake authentication.
-  host = (options.host or options.server).lower()
-  if host == "localhost" or host.startswith("localhost:"):
-    email = options.email
-    if email is None:
-      email = "test@example.com"
-      logging.info("Using debug user %s.  Override with --email" % email)
-    server = rpc_server_class(
-        options.server,
-        lambda: (email, "password"),
-        host_override=options.host,
-        extra_headers={"Cookie":
-                       'dev_appserver_login="%s:False"' % email},
-        save_cookies=options.save_cookies)
-    # Don't try to talk to ClientLogin.
-    server.authenticated = True
-    return server
-
-  return rpc_server_class(options.server, GetUserCredentials,
-                          host_override=options.host,
-                          save_cookies=options.save_cookies)
-
-
-def EncodeMultipartFormData(fields, files):
-  """Encode form fields for multipart/form-data.
-
-  Args:
-    fields: A sequence of (name, value) elements for regular form fields.
-    files: A sequence of (name, filename, value) elements for data to be
-           uploaded as files.
-  Returns:
-    (content_type, body) ready for httplib.HTTP instance.
-
-  Source:
-    http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/146306
-  """
-  BOUNDARY = '-M-A-G-I-C---B-O-U-N-D-A-R-Y-'
-  CRLF = '\r\n'
-  lines = []
-  for (key, value) in fields:
-    lines.append('--' + BOUNDARY)
-    lines.append('Content-Disposition: form-data; name="%s"' % key)
-    lines.append('')
-    lines.append(value)
-  for (key, filename, value) in files:
-    lines.append('--' + BOUNDARY)
-    lines.append('Content-Disposition: form-data; name="%s"; filename="%s"' %
-             (key, filename))
-    lines.append('Content-Type: %s' % GetContentType(filename))
-    lines.append('')
-    lines.append(value)
-  lines.append('--' + BOUNDARY + '--')
-  lines.append('')
-  body = CRLF.join(lines)
-  content_type = 'multipart/form-data; boundary=%s' % BOUNDARY
-  return content_type, body
-
-
-def GetContentType(filename):
-  """Helper to guess the content-type from the filename."""
-  return mimetypes.guess_type(filename)[0] or 'application/octet-stream'
-
-
-# Use a shell for subcommands on Windows to get a PATH search.
-use_shell = sys.platform.startswith("win")
-
-def RunShellWithReturnCode(command, print_output=False,
-                           universal_newlines=True,
-                           env=os.environ):
-  """Executes a command and returns the output from stdout and the return code.
-
-  Args:
-    command: Command to execute.
-    print_output: If True, the output is printed to stdout.
-                  If False, both stdout and stderr are ignored.
-    universal_newlines: Use universal_newlines flag (default: True).
-
-  Returns:
-    Tuple (output, return code)
-  """
-  logging.info("Running %s", command)
-  p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
-                       shell=use_shell, universal_newlines=universal_newlines,
-                       env=env)
-  if print_output:
-    output_array = []
-    while True:
-      line = p.stdout.readline()
-      if not line:
-        break
-      print line.strip("\n")
-      output_array.append(line)
-    output = "".join(output_array)
-  else:
-    output = p.stdout.read()
-  p.wait()
-  errout = p.stderr.read()
-  if print_output and errout:
-    print >>sys.stderr, errout
-  p.stdout.close()
-  p.stderr.close()
-  return output, p.returncode
-
-
-def RunShell(command, silent_ok=False, universal_newlines=True,
-             print_output=False, env=os.environ):
-  data, retcode = RunShellWithReturnCode(command, print_output,
-                                         universal_newlines, env)
-  if retcode:
-    ErrorExit("Got error status from %s:\n%s" % (command, data))
-  if not silent_ok and not data:
-    ErrorExit("No output from %s" % command)
-  return data
-
-
-class VersionControlSystem(object):
-  """Abstract base class providing an interface to the VCS."""
-
-  def __init__(self, options):
-    """Constructor.
-
-    Args:
-      options: Command line options.
-    """
-    self.options = options
-
-  def GenerateDiff(self, args):
-    """Return the current diff as a string.
-
-    Args:
-      args: Extra arguments to pass to the diff command.
-    """
-    raise NotImplementedError(
-        "abstract method -- subclass %s must override" % self.__class__)
-
-  def GetUnknownFiles(self):
-    """Return a list of files unknown to the VCS."""
-    raise NotImplementedError(
-        "abstract method -- subclass %s must override" % self.__class__)
-
-  def CheckForUnknownFiles(self):
-    """Show an "are you sure?" prompt if there are unknown files."""
-    unknown_files = self.GetUnknownFiles()
-    if unknown_files:
-      print "The following files are not added to version control:"
-      for line in unknown_files:
-        print line
-      prompt = "Are you sure to continue?(y/N) "
-      answer = raw_input(prompt).strip()
-      if answer != "y":
-        ErrorExit("User aborted")
-
-  def GetBaseFile(self, filename):
-    """Get the content of the upstream version of a file.
-
-    Returns:
-      A tuple (base_content, new_content, is_binary, status)
-        base_content: The contents of the base file.
-        new_content: For text files, this is empty.  For binary files, this is
-          the contents of the new file, since the diff output won't contain
-          information to reconstruct the current file.
-        is_binary: True iff the file is binary.
-        status: The status of the file.
-    """
-
-    raise NotImplementedError(
-        "abstract method -- subclass %s must override" % self.__class__)
-
-
-  def GetBaseFiles(self, diff):
-    """Helper that calls GetBase file for each file in the patch.
-
-    Returns:
-      A dictionary that maps from filename to GetBaseFile's tuple.  Filenames
-      are retrieved based on lines that start with "Index:" or
-      "Property changes on:".
-    """
-    files = {}
-    for line in diff.splitlines(True):
-      if line.startswith('Index:') or line.startswith('Property changes on:'):
-        unused, filename = line.split(':', 1)
-        # On Windows if a file has property changes its filename uses '\'
-        # instead of '/'.
-        filename = filename.strip().replace('\\', '/')
-        files[filename] = self.GetBaseFile(filename)
-    return files
-
-
-  def UploadBaseFiles(self, issue, rpc_server, patch_list, patchset, options,
-                      files):
-    """Uploads the base files (and if necessary, the current ones as well)."""
-
-    def UploadFile(filename, file_id, content, is_binary, status, is_base):
-      """Uploads a file to the server."""
-      file_too_large = False
-      if is_base:
-        type = "base"
-      else:
-        type = "current"
-      if len(content) > MAX_UPLOAD_SIZE:
-        print ("Not uploading the %s file for %s because it's too large." %
-               (type, filename))
-        file_too_large = True
-        content = ""
-      checksum = md5(content).hexdigest()
-      if options.verbose > 0 and not file_too_large:
-        print "Uploading %s file for %s" % (type, filename)
-      url = "/%d/upload_content/%d/%d" % (int(issue), int(patchset), file_id)
-      form_fields = [("filename", filename),
-                     ("status", status),
-                     ("checksum", checksum),
-                     ("is_binary", str(is_binary)),
-                     ("is_current", str(not is_base)),
-                    ]
-      if file_too_large:
-        form_fields.append(("file_too_large", "1"))
-      if options.email:
-        form_fields.append(("user", options.email))
-      ctype, body = EncodeMultipartFormData(form_fields,
-                                            [("data", filename, content)])
-      response_body = rpc_server.Send(url, body,
-                                      content_type=ctype)
-      if not response_body.startswith("OK"):
-        StatusUpdate("  --> %s" % response_body)
-        sys.exit(1)
-
-    patches = dict()
-    [patches.setdefault(v, k) for k, v in patch_list]
-    for filename in patches.keys():
-      base_content, new_content, is_binary, status = files[filename]
-      file_id_str = patches.get(filename)
-      if file_id_str.find("nobase") != -1:
-        base_content = None
-        file_id_str = file_id_str[file_id_str.rfind("_") + 1:]
-      file_id = int(file_id_str)
-      if base_content != None:
-        UploadFile(filename, file_id, base_content, is_binary, status, True)
-      if new_content != None:
-        UploadFile(filename, file_id, new_content, is_binary, status, False)
-
-  def IsImage(self, filename):
-    """Returns true if the filename has an image extension."""
-    mimetype =  mimetypes.guess_type(filename)[0]
-    if not mimetype:
-      return False
-    return mimetype.startswith("image/")
-
-  def IsBinary(self, filename):
-    """Returns true if the guessed mimetyped isnt't in text group."""
-    mimetype = mimetypes.guess_type(filename)[0]
-    if not mimetype:
-      return False  # e.g. README, "real" binaries usually have an extension
-    # special case for text files which don't start with text/
-    if mimetype in TEXT_MIMETYPES:
-      return False
-    return not mimetype.startswith("text/")
-
-
-class SubversionVCS(VersionControlSystem):
-  """Implementation of the VersionControlSystem interface for Subversion."""
-
-  def __init__(self, options):
-    super(SubversionVCS, self).__init__(options)
-    if self.options.revision:
-      match = re.match(r"(\d+)(:(\d+))?", self.options.revision)
-      if not match:
-        ErrorExit("Invalid Subversion revision %s." % self.options.revision)
-      self.rev_start = match.group(1)
-      self.rev_end = match.group(3)
-    else:
-      self.rev_start = self.rev_end = None
-    # Cache output from "svn list -r REVNO dirname".
-    # Keys: dirname, Values: 2-tuple (ouput for start rev and end rev).
-    self.svnls_cache = {}
-    # SVN base URL is required to fetch files deleted in an older revision.
-    # Result is cached to not guess it over and over again in GetBaseFile().
-    required = self.options.download_base or self.options.revision is not None
-    self.svn_base = self._GuessBase(required)
-
-  def GuessBase(self, required):
-    """Wrapper for _GuessBase."""
-    return self.svn_base
-
-  def _GuessBase(self, required):
-    """Returns the SVN base URL.
-
-    Args:
-      required: If true, exits if the url can't be guessed, otherwise None is
-        returned.
-    """
-    info = RunShell(["svn", "info"])
-    for line in info.splitlines():
-      words = line.split()
-      if len(words) == 2 and words[0] == "URL:":
-        url = words[1]
-        scheme, netloc, path, params, query, fragment = urlparse.urlparse(url)
-        username, netloc = urllib.splituser(netloc)
-        if username:
-          logging.info("Removed username from base URL")
-        if netloc.endswith("svn.python.org"):
-          if netloc == "svn.python.org":
-            if path.startswith("/projects/"):
-              path = path[9:]
-          elif netloc != "pythondev@svn.python.org":
-            ErrorExit("Unrecognized Python URL: %s" % url)
-          base = "http://svn.python.org/view/*checkout*%s/" % path
-          logging.info("Guessed Python base = %s", base)
-        elif netloc.endswith("svn.collab.net"):
-          if path.startswith("/repos/"):
-            path = path[6:]
-          base = "http://svn.collab.net/viewvc/*checkout*%s/" % path
-          logging.info("Guessed CollabNet base = %s", base)
-        elif netloc.endswith(".googlecode.com"):
-          path = path + "/"
-          base = urlparse.urlunparse(("http", netloc, path, params,
-                                      query, fragment))
-          logging.info("Guessed Google Code base = %s", base)
-        else:
-          path = path + "/"
-          base = urlparse.urlunparse((scheme, netloc, path, params,
-                                      query, fragment))
-          logging.info("Guessed base = %s", base)
-        return base
-    if required:
-      ErrorExit("Can't find URL in output from svn info")
-    return None
-
-  def GenerateDiff(self, args):
-    cmd = ["svn", "diff"]
-    if self.options.revision:
-      cmd += ["-r", self.options.revision]
-    cmd.extend(args)
-    data = RunShell(cmd)
-    count = 0
-    for line in data.splitlines():
-      if line.startswith("Index:") or line.startswith("Property changes on:"):
-        count += 1
-        logging.info(line)
-    if not count:
-      ErrorExit("No valid patches found in output from svn diff")
-    return data
-
-  def _CollapseKeywords(self, content, keyword_str):
-    """Collapses SVN keywords."""
-    # svn cat translates keywords but svn diff doesn't. As a result of this
-    # behavior patching.PatchChunks() fails with a chunk mismatch error.
-    # This part was originally written by the Review Board development team
-    # who had the same problem (http://reviews.review-board.org/r/276/).
-    # Mapping of keywords to known aliases
-    svn_keywords = {
-      # Standard keywords
-      'Date':                ['Date', 'LastChangedDate'],
-      'Revision':            ['Revision', 'LastChangedRevision', 'Rev'],
-      'Author':              ['Author', 'LastChangedBy'],
-      'HeadURL':             ['HeadURL', 'URL'],
-      'Id':                  ['Id'],
-
-      # Aliases
-      'LastChangedDate':     ['LastChangedDate', 'Date'],
-      'LastChangedRevision': ['LastChangedRevision', 'Rev', 'Revision'],
-      'LastChangedBy':       ['LastChangedBy', 'Author'],
-      'URL':                 ['URL', 'HeadURL'],
-    }
-
-    def repl(m):
-       if m.group(2):
-         return "$%s::%s$" % (m.group(1), " " * len(m.group(3)))
-       return "$%s$" % m.group(1)
-    keywords = [keyword
-                for name in keyword_str.split(" ")
-                for keyword in svn_keywords.get(name, [])]
-    return re.sub(r"\$(%s):(:?)([^\$]+)\$" % '|'.join(keywords), repl, content)
-
-  def GetUnknownFiles(self):
-    status = RunShell(["svn", "status", "--ignore-externals"], silent_ok=True)
-    unknown_files = []
-    for line in status.split("\n"):
-      if line and line[0] == "?":
-        unknown_files.append(line)
-    return unknown_files
-
-  def ReadFile(self, filename):
-    """Returns the contents of a file."""
-    file = open(filename, 'rb')
-    result = ""
-    try:
-      result = file.read()
-    finally:
-      file.close()
-    return result
-
-  def GetStatus(self, filename):
-    """Returns the status of a file."""
-    if not self.options.revision:
-      status = RunShell(["svn", "status", "--ignore-externals", filename])
-      if not status:
-        ErrorExit("svn status returned no output for %s" % filename)
-      status_lines = status.splitlines()
-      # If file is in a cl, the output will begin with
-      # "\n--- Changelist 'cl_name':\n".  See
-      # http://svn.collab.net/repos/svn/trunk/notes/changelist-design.txt
-      if (len(status_lines) == 3 and
-          not status_lines[0] and
-          status_lines[1].startswith("--- Changelist")):
-        status = status_lines[2]
-      else:
-        status = status_lines[0]
-    # If we have a revision to diff against we need to run "svn list"
-    # for the old and the new revision and compare the results to get
-    # the correct status for a file.
-    else:
-      dirname, relfilename = os.path.split(filename)
-      if dirname not in self.svnls_cache:
-        cmd = ["svn", "list", "-r", self.rev_start, dirname or "."]
-        out, returncode = RunShellWithReturnCode(cmd)
-        if returncode:
-          ErrorExit("Failed to get status for %s." % filename)
-        old_files = out.splitlines()
-        args = ["svn", "list"]
-        if self.rev_end:
-          args += ["-r", self.rev_end]
-        cmd = args + [dirname or "."]
-        out, returncode = RunShellWithReturnCode(cmd)
-        if returncode:
-          ErrorExit("Failed to run command %s" % cmd)
-        self.svnls_cache[dirname] = (old_files, out.splitlines())
-      old_files, new_files = self.svnls_cache[dirname]
-      if relfilename in old_files and relfilename not in new_files:
-        status = "D   "
-      elif relfilename in old_files and relfilename in new_files:
-        status = "M   "
-      else:
-        status = "A   "
-    return status
-
-  def GetBaseFile(self, filename):
-    status = self.GetStatus(filename)
-    base_content = None
-    new_content = None
-
-    # If a file is copied its status will be "A  +", which signifies
-    # "addition-with-history".  See "svn st" for more information.  We need to
-    # upload the original file or else diff parsing will fail if the file was
-    # edited.
-    if status[0] == "A" and status[3] != "+":
-      # We'll need to upload the new content if we're adding a binary file
-      # since diff's output won't contain it.
-      mimetype = RunShell(["svn", "propget", "svn:mime-type", filename],
-                          silent_ok=True)
-      base_content = ""
-      is_binary = bool(mimetype) and not mimetype.startswith("text/")
-      if is_binary and self.IsImage(filename):
-        new_content = self.ReadFile(filename)
-    elif (status[0] in ("M", "D", "R") or
-          (status[0] == "A" and status[3] == "+") or  # Copied file.
-          (status[0] == " " and status[1] == "M")):  # Property change.
-      args = []
-      if self.options.revision:
-        url = "%s/%s@%s" % (self.svn_base, filename, self.rev_start)
-      else:
-        # Don't change filename, it's needed later.
-        url = filename
-        args += ["-r", "BASE"]
-      cmd = ["svn"] + args + ["propget", "svn:mime-type", url]
-      mimetype, returncode = RunShellWithReturnCode(cmd)
-      if returncode:
-        # File does not exist in the requested revision.
-        # Reset mimetype, it contains an error message.
-        mimetype = ""
-      get_base = False
-      is_binary = bool(mimetype) and not mimetype.startswith("text/")
-      if status[0] == " ":
-        # Empty base content just to force an upload.
-        base_content = ""
-      elif is_binary:
-        if self.IsImage(filename):
-          get_base = True
-          if status[0] == "M":
-            if not self.rev_end:
-              new_content = self.ReadFile(filename)
-            else:
-              url = "%s/%s@%s" % (self.svn_base, filename, self.rev_end)
-              new_content = RunShell(["svn", "cat", url],
-                                     universal_newlines=True, silent_ok=True)
-        else:
-          base_content = ""
-      else:
-        get_base = True
-
-      if get_base:
-        if is_binary:
-          universal_newlines = False
-        else:
-          universal_newlines = True
-        if self.rev_start:
-          # "svn cat -r REV delete_file.txt" doesn't work. cat requires
-          # the full URL with "@REV" appended instead of using "-r" option.
-          url = "%s/%s@%s" % (self.svn_base, filename, self.rev_start)
-          base_content = RunShell(["svn", "cat", url],
-                                  universal_newlines=universal_newlines,
-                                  silent_ok=True)
-        else:
-          base_content = RunShell(["svn", "cat", filename],
-                                  universal_newlines=universal_newlines,
-                                  silent_ok=True)
-        if not is_binary:
-          args = []
-          if self.rev_start:
-            url = "%s/%s@%s" % (self.svn_base, filename, self.rev_start)
-          else:
-            url = filename
-            args += ["-r", "BASE"]
-          cmd = ["svn"] + args + ["propget", "svn:keywords", url]
-          keywords, returncode = RunShellWithReturnCode(cmd)
-          if keywords and not returncode:
-            base_content = self._CollapseKeywords(base_content, keywords)
-    else:
-      StatusUpdate("svn status returned unexpected output: %s" % status)
-      sys.exit(1)
-    return base_content, new_content, is_binary, status[0:5]
-
-
-class GitVCS(VersionControlSystem):
-  """Implementation of the VersionControlSystem interface for Git."""
-
-  def __init__(self, options):
-    super(GitVCS, self).__init__(options)
-    # Map of filename -> (hash before, hash after) of base file.
-    # Hashes for "no such file" are represented as None.
-    self.hashes = {}
-    # Map of new filename -> old filename for renames.
-    self.renames = {}
-
-  def GenerateDiff(self, extra_args):
-    # This is more complicated than svn's GenerateDiff because we must convert
-    # the diff output to include an svn-style "Index:" line as well as record
-    # the hashes of the files, so we can upload them along with our diff.
-
-    # Special used by git to indicate "no such content".
-    NULL_HASH = "0"*40
-
-    extra_args = extra_args[:]
-    if self.options.revision:
-      extra_args = [self.options.revision] + extra_args
-
-    # --no-ext-diff is broken in some versions of Git, so try to work around
-    # this by overriding the environment (but there is still a problem if the
-    # git config key "diff.external" is used).
-    env = os.environ.copy()
-    if 'GIT_EXTERNAL_DIFF' in env: del env['GIT_EXTERNAL_DIFF']
-    gitdiff = RunShell(["git", "diff", "--no-ext-diff", "--full-index", "-M"]
-                       + extra_args, env=env)
-    svndiff = []
-    filecount = 0
-    filename = None
-    for line in gitdiff.splitlines():
-      match = re.match(r"diff --git a/(.*) b/(.*)$", line)
-      if match:
-        filecount += 1
-        # Intentionally use the "after" filename so we can show renames.
-        filename = match.group(2)
-        svndiff.append("Index: %s\n" % filename)
-        if match.group(1) != match.group(2):
-          self.renames[match.group(2)] = match.group(1)
-      else:
-        # The "index" line in a git diff looks like this (long hashes elided):
-        #   index 82c0d44..b2cee3f 100755
-        # We want to save the left hash, as that identifies the base file.
-        match = re.match(r"index (\w+)\.\.(\w+)", line)
-        if match:
-          before, after = (match.group(1), match.group(2))
-          if before == NULL_HASH:
-            before = None
-          if after == NULL_HASH:
-            after = None
-          self.hashes[filename] = (before, after)
-      svndiff.append(line + "\n")
-    if not filecount:
-      ErrorExit("No valid patches found in output from git diff")
-    return "".join(svndiff)
-
-  def GetUnknownFiles(self):
-    status = RunShell(["git", "ls-files", "--exclude-standard", "--others"],
-                      silent_ok=True)
-    return status.splitlines()
-
-  def GetFileContent(self, file_hash, is_binary):
-    """Returns the content of a file identified by its git hash."""
-    data, retcode = RunShellWithReturnCode(["git", "show", file_hash],
-                                            universal_newlines=not is_binary)
-    if retcode:
-      ErrorExit("Got error status from 'git show %s'" % file_hash)
-    return data
-
-  def GetBaseFile(self, filename):
-    hash_before, hash_after = self.hashes.get(filename, (None,None))
-    base_content = None
-    new_content = None
-    is_binary = self.IsBinary(filename)
-    status = None
-
-    if filename in self.renames:
-      status = "A +"  # Match svn attribute name for renames.
-      if filename not in self.hashes:
-        # If a rename doesn't change the content, we never get a hash.
-        base_content = RunShell(["git", "show", filename])
-    elif not hash_before:
-      status = "A"
-      base_content = ""
-    elif not hash_after:
-      status = "D"
-    else:
-      status = "M"
-
-    is_image = self.IsImage(filename)
-
-    # Grab the before/after content if we need it.
-    # We should include file contents if it's text or it's an image.
-    if not is_binary or is_image:
-      # Grab the base content if we don't have it already.
-      if base_content is None and hash_before:
-        base_content = self.GetFileContent(hash_before, is_binary)
-      # Only include the "after" file if it's an image; otherwise it
-      # it is reconstructed from the diff.
-      if is_image and hash_after:
-        new_content = self.GetFileContent(hash_after, is_binary)
-
-    return (base_content, new_content, is_binary, status)
-
-
-class MercurialVCS(VersionControlSystem):
-  """Implementation of the VersionControlSystem interface for Mercurial."""
-
-  def __init__(self, options, repo_dir):
-    super(MercurialVCS, self).__init__(options)
-    # Absolute path to repository (we can be in a subdir)
-    self.repo_dir = os.path.normpath(repo_dir)
-    # Compute the subdir
-    cwd = os.path.normpath(os.getcwd())
-    assert cwd.startswith(self.repo_dir)
-    self.subdir = cwd[len(self.repo_dir):].lstrip(r"\/")
-    if self.options.revision:
-      self.base_rev = self.options.revision
-    else:
-      self.base_rev = RunShell(["hg", "parent", "-q"]).split(':')[1].strip()
-
-  def _GetRelPath(self, filename):
-    """Get relative path of a file according to the current directory,
-    given its logical path in the repo."""
-    assert filename.startswith(self.subdir), (filename, self.subdir)
-    return filename[len(self.subdir):].lstrip(r"\/")
-
-  def GenerateDiff(self, extra_args):
-    # If no file specified, restrict to the current subdir
-    extra_args = extra_args or ["."]
-    cmd = ["hg", "diff", "--git", "-r", self.base_rev] + extra_args
-    data = RunShell(cmd, silent_ok=True)
-    svndiff = []
-    filecount = 0
-    for line in data.splitlines():
-      m = re.match("diff --git a/(\S+) b/(\S+)", line)
-      if m:
-        # Modify line to make it look like as it comes from svn diff.
-        # With this modification no changes on the server side are required
-        # to make upload.py work with Mercurial repos.
-        # NOTE: for proper handling of moved/copied files, we have to use
-        # the second filename.
-        filename = m.group(2)
-        svndiff.append("Index: %s" % filename)
-        svndiff.append("=" * 67)
-        filecount += 1
-        logging.info(line)
-      else:
-        svndiff.append(line)
-    if not filecount:
-      ErrorExit("No valid patches found in output from hg diff")
-    return "\n".join(svndiff) + "\n"
-
-  def GetUnknownFiles(self):
-    """Return a list of files unknown to the VCS."""
-    args = []
-    status = RunShell(["hg", "status", "--rev", self.base_rev, "-u", "."],
-        silent_ok=True)
-    unknown_files = []
-    for line in status.splitlines():
-      st, fn = line.split(" ", 1)
-      if st == "?":
-        unknown_files.append(fn)
-    return unknown_files
-
-  def GetBaseFile(self, filename):
-    # "hg status" and "hg cat" both take a path relative to the current subdir
-    # rather than to the repo root, but "hg diff" has given us the full path
-    # to the repo root.
-    base_content = ""
-    new_content = None
-    is_binary = False
-    oldrelpath = relpath = self._GetRelPath(filename)
-    # "hg status -C" returns two lines for moved/copied files, one otherwise
-    out = RunShell(["hg", "status", "-C", "--rev", self.base_rev, relpath])
-    out = out.splitlines()
-    # HACK: strip error message about missing file/directory if it isn't in
-    # the working copy
-    if out[0].startswith('%s: ' % relpath):
-      out = out[1:]
-    if len(out) > 1:
-      # Moved/copied => considered as modified, use old filename to
-      # retrieve base contents
-      oldrelpath = out[1].strip()
-      status = "M"
-    else:
-      status, _ = out[0].split(' ', 1)
-    if ":" in self.base_rev:
-      base_rev = self.base_rev.split(":", 1)[0]
-    else:
-      base_rev = self.base_rev
-    if status != "A":
-      base_content = RunShell(["hg", "cat", "-r", base_rev, oldrelpath],
-        silent_ok=True)
-      is_binary = "\0" in base_content  # Mercurial's heuristic
-    if status != "R":
-      new_content = open(relpath, "rb").read()
-      is_binary = is_binary or "\0" in new_content
-    if is_binary and base_content:
-      # Fetch again without converting newlines
-      base_content = RunShell(["hg", "cat", "-r", base_rev, oldrelpath],
-        silent_ok=True, universal_newlines=False)
-    if not is_binary or not self.IsImage(relpath):
-      new_content = None
-    return base_content, new_content, is_binary, status
-
-
-# NOTE: The SplitPatch function is duplicated in engine.py, keep them in sync.
-def SplitPatch(data):
-  """Splits a patch into separate pieces for each file.
-
-  Args:
-    data: A string containing the output of svn diff.
-
-  Returns:
-    A list of 2-tuple (filename, text) where text is the svn diff output
-      pertaining to filename.
-  """
-  patches = []
-  filename = None
-  diff = []
-  for line in data.splitlines(True):
-    new_filename = None
-    if line.startswith('Index:'):
-      unused, new_filename = line.split(':', 1)
-      new_filename = new_filename.strip()
-    elif line.startswith('Property changes on:'):
-      unused, temp_filename = line.split(':', 1)
-      # When a file is modified, paths use '/' between directories, however
-      # when a property is modified '\' is used on Windows.  Make them the same
-      # otherwise the file shows up twice.
-      temp_filename = temp_filename.strip().replace('\\', '/')
-      if temp_filename != filename:
-        # File has property changes but no modifications, create a new diff.
-        new_filename = temp_filename
-    if new_filename:
-      if filename and diff:
-        patches.append((filename, ''.join(diff)))
-      filename = new_filename
-      diff = [line]
-      continue
-    if diff is not None:
-      diff.append(line)
-  if filename and diff:
-    patches.append((filename, ''.join(diff)))
-  return patches
-
-
-def UploadSeparatePatches(issue, rpc_server, patchset, data, options):
-  """Uploads a separate patch for each file in the diff output.
-
-  Returns a list of [patch_key, filename] for each file.
-  """
-  patches = SplitPatch(data)
-  rv = []
-  for patch in patches:
-    if len(patch[1]) > MAX_UPLOAD_SIZE:
-      print ("Not uploading the patch for " + patch[0] +
-             " because the file is too large.")
-      continue
-    form_fields = [("filename", patch[0])]
-    if not options.download_base:
-      form_fields.append(("content_upload", "1"))
-    files = [("data", "data.diff", patch[1])]
-    ctype, body = EncodeMultipartFormData(form_fields, files)
-    url = "/%d/upload_patch/%d" % (int(issue), int(patchset))
-    print "Uploading patch for " + patch[0]
-    response_body = rpc_server.Send(url, body, content_type=ctype)
-    lines = response_body.splitlines()
-    if not lines or lines[0] != "OK":
-      StatusUpdate("  --> %s" % response_body)
-      sys.exit(1)
-    rv.append([lines[1], patch[0]])
-  return rv
-
-
-def GuessVCSName():
-  """Helper to guess the version control system.
-
-  This examines the current directory, guesses which VersionControlSystem
-  we're using, and returns an string indicating which VCS is detected.
-
-  Returns:
-    A pair (vcs, output).  vcs is a string indicating which VCS was detected
-    and is one of VCS_GIT, VCS_MERCURIAL, VCS_SUBVERSION, or VCS_UNKNOWN.
-    output is a string containing any interesting output from the vcs
-    detection routine, or None if there is nothing interesting.
-  """
-  # Mercurial has a command to get the base directory of a repository
-  # Try running it, but don't die if we don't have hg installed.
-  # NOTE: we try Mercurial first as it can sit on top of an SVN working copy.
-  try:
-    out, returncode = RunShellWithReturnCode(["hg", "root"])
-    if returncode == 0:
-      return (VCS_MERCURIAL, out.strip())
-  except OSError, (errno, message):
-    if errno != 2:  # ENOENT -- they don't have hg installed.
-      raise
-
-  # Subversion has a .svn in all working directories.
-  if os.path.isdir('.svn'):
-    logging.info("Guessed VCS = Subversion")
-    return (VCS_SUBVERSION, None)
-
-  # Git has a command to test if you're in a git tree.
-  # Try running it, but don't die if we don't have git installed.
-  try:
-    out, returncode = RunShellWithReturnCode(["git", "rev-parse",
-                                              "--is-inside-work-tree"])
-    if returncode == 0:
-      return (VCS_GIT, None)
-  except OSError, (errno, message):
-    if errno != 2:  # ENOENT -- they don't have git installed.
-      raise
-
-  return (VCS_UNKNOWN, None)
-
-
-def GuessVCS(options):
-  """Helper to guess the version control system.
-
-  This verifies any user-specified VersionControlSystem (by command line
-  or environment variable).  If the user didn't specify one, this examines
-  the current directory, guesses which VersionControlSystem we're using,
-  and returns an instance of the appropriate class.  Exit with an error
-  if we can't figure it out.
-
-  Returns:
-    A VersionControlSystem instance. Exits if the VCS can't be guessed.
-  """
-  vcs = options.vcs
-  if not vcs:
-    vcs = os.environ.get("CODEREVIEW_VCS")
-  if vcs:
-    v = VCS_ABBREVIATIONS.get(vcs.lower())
-    if v is None:
-      ErrorExit("Unknown version control system %r specified." % vcs)
-    (vcs, extra_output) = (v, None)
-  else:
-    (vcs, extra_output) = GuessVCSName()
-
-  if vcs == VCS_MERCURIAL:
-    if extra_output is None:
-      extra_output = RunShell(["hg", "root"]).strip()
-    return MercurialVCS(options, extra_output)
-  elif vcs == VCS_SUBVERSION:
-    return SubversionVCS(options)
-  elif vcs == VCS_GIT:
-    return GitVCS(options)
-
-  ErrorExit(("Could not guess version control system. "
-             "Are you in a working copy directory?"))
-
-
-def CheckReviewer(reviewer):
-  """Validate a reviewer -- either a nickname or an email addres.
-
-  Args:
-    reviewer: A nickname or an email address.
-
-  Calls ErrorExit() if it is an invalid email address.
-  """
-  if "@" not in reviewer:
-    return  # Assume nickname
-  parts = reviewer.split("@")
-  if len(parts) > 2:
-    ErrorExit("Invalid email address: %r" % reviewer)
-  assert len(parts) == 2
-  if "." not in parts[1]:
-    ErrorExit("Invalid email address: %r" % reviewer)
-
-
-def RealMain(argv, data=None):
-  """The real main function.
-
-  Args:
-    argv: Command line arguments.
-    data: Diff contents. If None (default) the diff is generated by
-      the VersionControlSystem implementation returned by GuessVCS().
-
-  Returns:
-    A 2-tuple (issue id, patchset id).
-    The patchset id is None if the base files are not uploaded by this
-    script (applies only to SVN checkouts).
-  """
-  logging.basicConfig(format=("%(asctime).19s %(levelname)s %(filename)s:"
-                              "%(lineno)s %(message)s "))
-  os.environ['LC_ALL'] = 'C'
-  options, args = parser.parse_args(argv[1:])
-  global verbosity
-  verbosity = options.verbose
-  if verbosity >= 3:
-    logging.getLogger().setLevel(logging.DEBUG)
-  elif verbosity >= 2:
-    logging.getLogger().setLevel(logging.INFO)
-  vcs = GuessVCS(options)
-  if isinstance(vcs, SubversionVCS):
-    # base field is only allowed for Subversion.
-    # Note: Fetching base files may become deprecated in future releases.
-    base = vcs.GuessBase(options.download_base)
-  else:
-    base = None
-  if not base and options.download_base:
-    options.download_base = True
-    logging.info("Enabled upload of base file")
-  if not options.assume_yes:
-    vcs.CheckForUnknownFiles()
-  if data is None:
-    data = vcs.GenerateDiff(args)
-  files = vcs.GetBaseFiles(data)
-  if verbosity >= 1:
-    print "Upload server:", options.server, "(change with -s/--server)"
-  if options.issue:
-    prompt = "Message describing this patch set: "
-  else:
-    prompt = "New issue subject: "
-  message = options.message or raw_input(prompt).strip()
-  if not message:
-    ErrorExit("A non-empty message is required")
-  rpc_server = GetRpcServer(options)
-  form_fields = [("subject", message)]
-  if base:
-    form_fields.append(("base", base))
-  if options.issue:
-    form_fields.append(("issue", str(options.issue)))
-  if options.email:
-    form_fields.append(("user", options.email))
-  if options.reviewers:
-    for reviewer in options.reviewers.split(','):
-      CheckReviewer(reviewer)
-    form_fields.append(("reviewers", options.reviewers))
-  if options.cc:
-    for cc in options.cc.split(','):
-      CheckReviewer(cc)
-    form_fields.append(("cc", options.cc))
-  description = options.description
-  if options.description_file:
-    if options.description:
-      ErrorExit("Can't specify description and description_file")
-    file = open(options.description_file, 'r')
-    description = file.read()
-    file.close()
-  if description:
-    form_fields.append(("description", description))
-  # Send a hash of all the base file so the server can determine if a copy
-  # already exists in an earlier patchset.
-  base_hashes = ""
-  for file, info in files.iteritems():
-    if not info[0] is None:
-      checksum = md5(info[0]).hexdigest()
-      if base_hashes:
-        base_hashes += "|"
-      base_hashes += checksum + ":" + file
-  form_fields.append(("base_hashes", base_hashes))
-  if options.private:
-    if options.issue:
-      print "Warning: Private flag ignored when updating an existing issue."
-    else:
-      form_fields.append(("private", "1"))
-  # If we're uploading base files, don't send the email before the uploads, so
-  # that it contains the file status.
-  if options.send_mail and options.download_base:
-    form_fields.append(("send_mail", "1"))
-  if not options.download_base:
-    form_fields.append(("content_upload", "1"))
-  if len(data) > MAX_UPLOAD_SIZE:
-    print "Patch is large, so uploading file patches separately."
-    uploaded_diff_file = []
-    form_fields.append(("separate_patches", "1"))
-  else:
-    uploaded_diff_file = [("data", "data.diff", data)]
-  ctype, body = EncodeMultipartFormData(form_fields, uploaded_diff_file)
-  response_body = rpc_server.Send("/upload", body, content_type=ctype)
-  patchset = None
-  if not options.download_base or not uploaded_diff_file:
-    lines = response_body.splitlines()
-    if len(lines) >= 2:
-      msg = lines[0]
-      patchset = lines[1].strip()
-      patches = [x.split(" ", 1) for x in lines[2:]]
-    else:
-      msg = response_body
-  else:
-    msg = response_body
-  StatusUpdate(msg)
-  if not response_body.startswith("Issue created.") and \
-  not response_body.startswith("Issue updated."):
-    sys.exit(0)
-  issue = msg[msg.rfind("/")+1:]
-
-  if not uploaded_diff_file:
-    result = UploadSeparatePatches(issue, rpc_server, patchset, data, options)
-    if not options.download_base:
-      patches = result
-
-  if not options.download_base:
-    vcs.UploadBaseFiles(issue, rpc_server, patches, patchset, options, files)
-    if options.send_mail:
-      rpc_server.Send("/" + issue + "/mail", payload="")
-  return issue, patchset
-
-
-def main():
-  try:
-    RealMain(sys.argv)
-  except KeyboardInterrupt:
-    print
-    StatusUpdate("Interrupted.")
-    sys.exit(1)
-
-
-if __name__ == "__main__":
-  main()