client.py
author Philipp Kewisch <mozilla@kewis.ch>
Sat, 03 Jun 2017 12:43:47 +0200
changeset 50917 4c75875995a40e4586770d54d01e83967cc1ebe8
parent 46899 17f9a0ee026116cea6bffcddb6a8d5bc61bb839b
child 46931 e1b7dc9aafdf83ec368faed7cda58ceea9f6857e
child 50127 2c8ae468d952ab9951424b27e45c4424ea96811e
child 52566 3d02c8cb88d610d4edd1febbc8fc970a81821bf6
child 52579 b6bd8475ac4f0c514f0d8df61c9026f43dba9f28
child 52582 0cbfb8641fe9403ccfab195c1aa0490bc34b0719
child 52588 0e10366a7f2b91d381c0f761a09578225e87f8f0
child 53285 7a241f9bfde57045e8331a4b5bc99e2edef252c0
child 63691 9b85bcae26a8e1a48ef73f223c4f825a941a7fdd
child 64007 32d9b8d10da1409f66afbd0fd405674d7fa85d49
permissions -rwxr-xr-x
Bug 1312766 - Enable Kazakh language in nightly builds. r=me MozReview-Commit-ID: 2C1E1YuVDyV

#!/usr/bin/env python
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.


# Warning, this file must be compatible with Python 2.4, for our
# various tools, such as http://mxr.mozilla.org/ see-also: Bug 601207

# Repo Defaults
# 'REV' controls the default rev for All the various repo's
# Define x_REV to override. Where x can be one of:
#  "COMM", "MOZILLA", "CHATZILLA", "INSPECTOR"
DEFAULTS = {
    # Global Default Revision
    'REV': "default",

    # URL of the default hg repository to clone for ChatZilla.
    'CHATZILLA_REPO': 'https://hg.mozilla.org/chatzilla/',
    # The stable revision to use for the next branch
    #  'CHATZILLA_REV':  'SEA2_48_RELBRANCH',

    # URL of the default hg repository to clone for DOM Inspector.
    'INSPECTOR_REPO': 'https://hg.mozilla.org/dom-inspector/',
    # The stable revision to use for the next branch
    #  'INSPECTOR_REV':  'DOMI_2_0_17',

    # URL of the default hg repository to clone for Mozilla.
    'MOZILLA_REPO': 'https://hg.mozilla.org/mozilla-central/',
}

REPO_SHORT_NAMES = {
    'mozilla-central':  'moz',
    'dom-inspector':    'dom',
}


def get_DEFAULT_tag(index):
    if index in DEFAULTS:
        return DEFAULTS[index]
    else:
        return DEFAULTS['REV']

# The set of defaults below relate to the current switching mechanism between
# trunk or branches and back again if it is required.

# The current version expected in the .treestate file for nothing to happen.
# This reflects the "[treestate] src_update_version = ..." value.
#
# src_update_version values:
# '1' : mozilla/ may have been moved to mozilla-1.9.1 (or kept the same
#       depending on set-up).
# '2' : mozilla/ may have been moved back to mozilla-central.
CURRENT_TREESTATE_VERSION = '2'
# REGEX to match against, $1 should refer to protocol scheme
SWITCH_MOZILLA_REPO_REGEXP = '(ssh|http|https):\/\/hg\.mozilla\.org\/releases/mozilla-1.9.1\/?$'
# The location to back-up the existing mozilla repo to, e.g. ".mozilla-trunk"
# or ".mozilla-1.9.1".
SWITCH_MOZILLA_REPO_BACKUP_LOCATION = ".mozilla-1.9.1"
# This is the potential location for a repository from the last time we
# switched. Can be blank for no effect.
SWITCH_MOZILLA_REPO_OLD_REPO_LOCATION = ".mozilla-trunk"
# This should be the same as DEFAULTS['MOZILLA_REPO'] but using %s instead
# of http for the scheme.
SWITCH_MOZILLA_REPO_REPLACE = '%s://hg.mozilla.org/mozilla-central/'
SWITCH_MOZILLA_BASE_REV = "GECKO_1_9_1_BASE"

import sys
# Test Python Version. 2.4 required for `import subprocess`
pyver = sys.version_info
if pyver[0] <= 1 or (pyver[0] == 2 and pyver[1] < 4):
    sys.exit("ERROR: Python 2.4 or newer required")
elif pyver[0] >= 3:
    # Python series 3 will syntax error here, Hack needed per Bug 601649c#8
    print "ERROR: Python series 3 is not supported, use series 2 >= 2.4"
    sys.exit()  # Do an explicit sys.exit for code clarity.
del pyver

import os
from optparse import OptionParser, OptionValueError
import urllib2
import re

topsrcdir = os.path.dirname(__file__)
if topsrcdir == '':
    topsrcdir = '.'

TREE_STATE_FILE = os.path.join(topsrcdir, '.treestate')

try:
    from subprocess import check_call
except ImportError:
    import subprocess

    def check_call(*popenargs, **kwargs):
        retcode = subprocess.call(*popenargs, **kwargs)
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
                raise Exception("Command '%s' returned non-zero exit status %i" % (cmd, retcode))

try:
    from subprocess import check_output
except ImportError:
    import subprocess

    def check_output(*popenargs, **kwargs):
        if 'stdout' in kwargs:
            raise ValueError('stdout argument not allowed, it will be overridden.')
        process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
        output, unused_err = process.communicate()
        retcode = process.poll()
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
            raise CalledProcessError(retcode, cmd, output=output)
        return output


def check_call_output(cmd, *args, **kwargs):
    return check_output(cmd, *args, **kwargs)


def check_call_noisy(cmd, retryMax=0, *args, **kwargs):
    """Wrapper around execute_check_call() to allow retries before failing.

    |cmd|, is the command to try and execute.
    |retryMax|, is the maximum number of retries to attempt, 0 by default.
    """

    def execute_check_call(cmd, *args, **kwargs):
        print "Executing command:", cmd
        check_call(cmd, *args, **kwargs)

    # By default (= no retries), simply pass the call on.
    if retryMax == 0:
        execute_check_call(cmd, *args, **kwargs)
        return

    # Loop (1 + retryMax) times, at most.
    for r in range(0, 1 + retryMax):
        # Add a retry header, not for initial call.
        if r != 0:
            print >> sys.stderr, "Retrying previous command: %d of %d time(s)" % (r, retryMax)
        try:
            # (Re-)Try the call.
            execute_check_call(cmd, *args, **kwargs)
            # If the call succeeded then no more retries.
            break
        except:
            # Print the exception without its traceback.
            # This traceback starts in the try block, which should be low value.
            print >> sys.stderr, "The exception was:"
            sys.excepthook(sys.exc_info()[0], sys.exc_info()[1], None)
            # Add a blank line.
            print >> sys.stderr
        else:
            # Raise our own exception.
            # This traceback starts at (= reports) the initial caller line.
            raise Exception("Command '%s' failed %d time(s). Giving up." %
                            (cmd, retryMax + 1))


def repo_config():
    """Create/Update TREE_STATE_FILE as needed.

    switch_mozilla_repo() may be called if the branch that the mozilla repo is
    on needs changing
    """

    import ConfigParser

    config_version = CURRENT_TREESTATE_VERSION

    config = ConfigParser.ConfigParser()

    # If the file exists, see if we need to move to the stable branch.
    # If it doesn't exist, we assume the user hasn't pulled before (or has
    # done it manually) and therefore leave his mozilla/ repo as it is.
    if os.path.exists(TREE_STATE_FILE):
        config.read([TREE_STATE_FILE])

        if config.has_option('treestate', 'src_update_version'):
            config_version = config.get('treestate', 'src_update_version')
        else:
            # If src_update_version doesn't exist, assume this to be '1' and
            # apply the update. This was because the first version of this
            # migration allowed the existence of the file to equate to '1'.
            config_version = '1'

    # Do nothing if the current version is up to date.
    if config_version < CURRENT_TREESTATE_VERSION:
        switch_mozilla_repo()

    if not os.path.exists(TREE_STATE_FILE) or config_version < CURRENT_TREESTATE_VERSION:
        if not config.has_section('treestate'):
            config.add_section('treestate')
        config.set('treestate', 'src_update_version',
                   CURRENT_TREESTATE_VERSION)

        # Write this file out
        f = open(TREE_STATE_FILE, 'w')
        try:
            config.write(f)
        finally:
            f.close()


def switch_mozilla_repo():
    """If the mozilla/ repo matches SWITCH_MOZILLA_REPO_REGEXP then:
    1) Backup (unused anymore) checkout of mozilla/.
    2a) If SWITCH_MOZILLA_REPO_OLD_REPO_LOCATION exists, move that to mozilla/.
    2b) Else clone the backup of mozilla/ up to the SWITCH_MOZILLA_BASE_REV
        revision and set the pull location to SWITCH_MOZILLA_REPO_REPLACE.

    It is expected that the normal pull/update functions in this script will
    update the new mozilla/ repo to the latest version.
    """

    mozilla_path = os.path.join(topsrcdir, 'mozilla')
    # Do nothing if there is no Mozilla directory.
    if not os.path.exists(mozilla_path):
        return

    import ConfigParser
    import re
    config = ConfigParser.ConfigParser()
    config_path = os.path.join(mozilla_path, '.hg', 'hgrc')
    config.read([config_path])
    if not config.has_option('paths', 'default'):
        # Abort, not to get into a possibly inconsistent state.
        sys.exit("Error: default path in %s is undefined!" % config_path)

    # Compile the Mozilla repository regex.
    moz_old_regex = re.compile(SWITCH_MOZILLA_REPO_REGEXP, re.I)
    match = moz_old_regex.match(config.get('paths', 'default'))
    # Do nothing if not pulling from the one we're trying to switch from.
    if not match:
        return

    config.set('paths', 'default',
               SWITCH_MOZILLA_REPO_REPLACE % match.group(1))

    if config.has_option('paths', 'default-push'):
        match = moz_old_regex.match(config.get('paths', 'default-push'))
        # Do not update this property if not pushing to Mozilla trunk.
        if match:
            config.set('paths', 'default-push',
                       SWITCH_MOZILLA_REPO_REPLACE % match.group(1))

    hgcloneopts = []
    if options.hgcloneopts:
        hgcloneopts = options.hgcloneopts.split()

    hgopts = []
    if options.hgopts:
        hgopts = options.hgopts.split()

    backup_mozilla_path = os.path.join(topsrcdir,
                                       SWITCH_MOZILLA_REPO_BACKUP_LOCATION)
    print "Moving mozilla to " + SWITCH_MOZILLA_REPO_BACKUP_LOCATION + "..."
    try:
        os.rename(mozilla_path, backup_mozilla_path)
    except:
        # Print the exception without its traceback.
        sys.excepthook(sys.exc_info()[0], sys.exc_info()[1], None)
        sys.exit("Error: Mozilla directory renaming failed!")

    # Does the user have a pre-existing backup repository?
    old_backup_repository = os.path.join(topsrcdir,
                                         SWITCH_MOZILLA_REPO_OLD_REPO_LOCATION)
    if SWITCH_MOZILLA_REPO_OLD_REPO_LOCATION != "" and \
            os.path.exists(old_backup_repository):
        # Yes, so let's use that
        print "Moving " + old_backup_repository + " to " + mozilla_path + "..."
        try:
            os.rename(old_backup_repository, mozilla_path)
        except:
            # Print the exception without its traceback.
            sys.excepthook(sys.exc_info()[0], sys.exc_info()[1], None)
            sys.exit("Error: Renaming old backup directory failed! You must recover manually.")
        # Let's leave the hgrc as it was, so any repo specific config is left
        # the same.
        return

    # Locally clone common repository history.
    check_call_noisy([options.hg, 'clone', '-r', SWITCH_MOZILLA_BASE_REV] +
                     hgcloneopts + hgopts + [backup_mozilla_path, mozilla_path],
                     retryMax=options.retries)

    # Rewrite hgrc for new local mozilla repo based on pre-existing hgrc
    # but with new values
    f = open(os.path.join(topsrcdir, 'mozilla', '.hg', 'hgrc'), 'w')
    try:
        config.write(f)
    finally:
        f.close()


def backup_cvs_extension(extensionName, extensionDir, extensionPath):
    """Backup (obsolete) cvs checkout of extensionName.
    """

    # Do nothing if there is no extensionName cvs directory.
    if not os.path.exists(os.path.join(extensionPath, 'CVS')):
        return

    extensionBackupPath = extensionPath + '-cvs'
    print "Moving %s to %s-cvs..." % (extensionDir, extensionDir)
    try:
        os.rename(extensionPath, extensionBackupPath)
    except:
        # Print the exception without its traceback.
        sys.excepthook(sys.exc_info()[0], sys.exc_info()[1], None)
        sys.exit("Error: %s directory renaming failed!" % extensionName)


def do_hg_pull(dir, repository, hg, rev, hgtool=None, hgtool1=None):
    """Clone if the dir doesn't exist, pull if it does.
    """

    fulldir = os.path.join(topsrcdir, dir)

    hgcloneopts = []
    if options.hgcloneopts:
        hgcloneopts = options.hgcloneopts.split()

    hgopts = []
    if options.hgopts:
        hgopts = options.hgopts.split()

    if hgtool or hgtool1:
        if not os.path.exists(hgtool):
            hgtool = hgtool1

    if hgtool:
        hgtoolcmd = hgtool.split()
        # We need to strip the trailing slash from the repository url so that
        # the hg tool gets a url that's consistent with the rest of the build
        # automation.
        repo = repository.rstrip('/')

        # Make sure to unset the PROPERTIES_FILE variable, otherwise hgtool
        # might use this for the revisions and branches.
        hgtoolenv = os.environ.copy()
        if 'PROPERTIES_FILE' in hgtoolenv:
            del hgtoolenv['PROPERTIES_FILE']

        # Set up the tool options, most importantly the revision
        hgtoolopts = ['-r', rev]
        if options.verbose:
            hgtoolopts.append('-v')

        check_call_noisy(['python'] + hgtoolcmd +
                         hgtoolopts +
                         [repo, fulldir],
                         env=hgtoolenv,
                         retryMax=options.retries)
    else:
        if not os.path.exists(fulldir):
            fulldir = os.path.join(topsrcdir, dir)
            check_call_noisy([hg, 'clone'] + hgcloneopts + hgopts +
                             [repository, fulldir],
                             retryMax=options.retries)
        else:
            cmd = [hg, 'pull', '-R', fulldir] + hgopts
            if repository is not None:
                cmd.append(repository)
            check_call_noisy(cmd, retryMax=options.retries)

        # update to specific revision
        cmd = [hg, 'update', '-r', rev, '-R', fulldir] + hgopts
        if options.verbose:
            cmd.append('-v')
        # Explicitly never retry 'hg update': otherwise any merge failures are
        # ignored.
        # This command is local: a failure can't be caused by a network error.
        check_call_noisy(cmd, retryMax=0)

    check_call([hg, 'parent', '-R', fulldir,
                '--template=Updated to revision {node}.\n'])

    if options.tinderbox_print and dir != '.':
        got_rev = check_call_output([hg, 'parent', '-R', fulldir,
                                     '--template={node}'])

        url = check_call_output([hg, 'paths', 'default', '-R', fulldir]).rstrip().rstrip('/')
        repo_name = url.split('/')[-1]
        repo_short_name = REPO_SHORT_NAMES.get(repo_name, repo_name)

        print "TinderboxPrint:<a href=%s/rev/%s title='Built from %s revision %s'>%s:%s</a>" % (url, got_rev, repo_name, got_rev, repo_short_name, got_rev)


def check_retries_option(option, opt_str, value, parser):
    if value < 0:
        raise OptionValueError("%s option value needs to be positive (not '%d')" %
                               (opt_str, value))
    setattr(parser.values, option.dest, value)


def do_apply_patch(hg, patch, repo):
    check_call_noisy([hg,
                      'import',
                      '-R', repo,
                      '-m', "local patch from %s" % patch,
                      '--no-commit', '--force',
                      patch,
                      ],
                     retryMax=0
                     )
    return

import glob


def do_apply_patches(topsrcdir, hg):
    prefix_map = {
        'mozilla': 'mozilla',
        'chatzilla': os.path.join('mozilla', 'extensions', 'irc'),
        'inspector': os.path.join('mozilla', 'extensions', 'inspector'),
    }

    for prefix in prefix_map.keys():
        prefix_dir = prefix_map.get(prefix)
        files = glob.glob("%s*.patch" % prefix)
        files.sort()
        for file in files:
            patch = os.path.join(topsrcdir, file)
            if os.path.exists(patch):
                do_apply_patch(hg, patch, prefix_dir)

o = OptionParser(usage="%prog [options] checkout")
o.add_option("-m", "--comm-repo", dest="comm_repo",
             default=None,
             help="URL of comm (Calendar/Mail/Suite) repository to pull from (default: use hg default in .hg/hgrc)")
o.add_option("--skip-comm", dest="skip_comm",
             action="store_true", default=False,
             help="Skip pulling the comm (Calendar/Mail/Suite) repository.")
o.add_option("--comm-rev", dest="comm_rev",
             default=None,
             help="Revision of comm (Calendar/Mail/Suite) repository to update to. If not present, COMM_REV from the environment will be used. If that doesn't exist the default is: \"" + get_DEFAULT_tag('COMM_REV') + "\"")

o.add_option("-z", "--mozilla-repo", dest="mozilla_repo",
             default=None,
             help="URL of Mozilla repository to pull from (default: use hg default in mozilla/.hg/hgrc; or if that file doesn't exist, use \"" + DEFAULTS['MOZILLA_REPO'] + "\".)")
o.add_option("--skip-mozilla", dest="skip_mozilla",
             action="store_true", default=False,
             help="Skip pulling the Mozilla repository.")
o.add_option("--mozilla-rev", dest="mozilla_rev",
             default=None,
             help="Revision of Mozilla repository to update to. If not present, MOZILLA_REV from the environment will be used. If that doesn't exist the default is: \"" + get_DEFAULT_tag('MOZILLA_REV') + "\"")
o.add_option("--known-good", dest="known_good",
             action="store_true", default=False,
             help="Use the last known-good Mozilla repository revision.")

o.add_option("--inspector-repo", dest="inspector_repo",
             default=None,
             help="URL of DOM Inspector repository to pull from (default: use hg default in mozilla/extensions/inspector/.hg/hgrc; or if that file doesn't exist, use \"" + DEFAULTS['INSPECTOR_REPO'] + "\".)")
o.add_option("--skip-inspector", dest="skip_inspector",
             action="store_true", default=False,
             help="Skip pulling the DOM Inspector repository.")
o.add_option("--inspector-rev", dest="inspector_rev",
             default=None,
             help="Revision of DOM Inspector repository to update to. Default: \"" + get_DEFAULT_tag('INSPECTOR_REV') + "\"")

o.add_option("--chatzilla-repo", dest="chatzilla_repo",
             default=None,
             help="URL of ChatZilla repository to pull from (default: use hg default in mozilla/extensions/irc/.hg/hgrc; or if that file doesn't exist, use \"" + DEFAULTS['CHATZILLA_REPO'] + "\".)")
o.add_option("--skip-chatzilla", dest="skip_chatzilla",
             action="store_true", default=False,
             help="Skip pulling the ChatZilla repository.")
o.add_option("--chatzilla-rev", dest="chatzilla_rev",
             default=None,
             help="Revision of ChatZilla repository to update to. Default: \"" + get_DEFAULT_tag('CHATZILLA_REV') + "\"")

o.add_option("--skip-venkman", dest="skip_venkman",
             action="store_true", default=False,
             help="Obsolete option, supported for backwards compat.")
o.add_option("--venkman-rev", dest="venkman_rev",
             default=None,
             help="Obsolete option, supported for backwards compat.")

o.add_option("--hg", dest="hg", default=os.environ.get('HG', 'hg'),
             help="The location of the hg binary")
o.add_option("-v", "--verbose", dest="verbose",
             action="store_true", default=False,
             help="Enable verbose output on hg updates")
o.add_option("--hgtool", dest="hgtool",
             default=None,
             help="Path to hgtool, if wanted")
o.add_option("--hgtool1", dest="hgtool1",
             default=None,
             help="Alternative path to hgtool, if wanted")
o.add_option("--hg-options", dest="hgopts",
             help="Pass arbitrary options to hg commands (i.e. --debug, --time)")
o.add_option("--hg-clone-options", dest="hgcloneopts",
             help="Pass arbitrary options to hg clone commands (i.e. --uncompressed)")

o.add_option("--retries", dest="retries", type="int", metavar="NUM",
             default=1, help="Number of times to retry a failed command before giving up. (default: 1)",
             action="callback", callback=check_retries_option)

o.add_option("-r", "--rev", dest="default_rev",
             default=None,
             help="Revision of all repositories to update to, unless otherwise specified.")

o.add_option("--apply-patches", dest="apply_patches",
             action="store_true", default=False,
             help="Look for and apply local patches (repo*.patch)")

o.add_option("--tinderbox-print", dest="tinderbox_print",
             action="store_true", default=False,
             help="Print repo revisions for Tinderbox")


def fixup_comm_repo_options(options):
    """Check options.comm_repo value.

    options.comm_repo is normally None.
    This is fine -- our "hg pull" command will omit the repo URL.
    The exception is the initial checkout, which does an "hg clone".
    That command requires a repository URL.
    """

    if options.comm_repo is None and \
            not os.path.exists(os.path.join(topsrcdir, '.hg')):
        o.print_help()
        print
        print "Error: the -m option is required for the initial checkout!"
        sys.exit(2)

    # If COMM_REV is passed via environment, prefer that over the passed
    # option so that automation can pass tagged versions while still defaulting
    # to a certain revision via client.py-args.
    envRev = os.environ.get("COMM_REV")
    if envRev:
        if options.comm_rev and options.comm_rev != envRev:
            print "Warning: Preferring COMM_REV (%s) over passed revision (%s)" % (envRev, options.comm_rev)
        else:
            print "Using COMM_REV from environment (%s)" % envRev
        options.comm_rev = envRev

    # If no version was set before, use the default comm revision.
    if options.comm_rev is None:
        options.comm_rev = get_DEFAULT_tag("COMM_REV")


def fixup_mozilla_repo_options(options):
    """Handle special case: initial checkout of Mozilla.

    See fixup_comm_repo_options().
    """
    if options.mozilla_repo is None:
        if not os.path.exists(os.path.join(topsrcdir, 'mozilla')):
            options.mozilla_repo = DEFAULTS['MOZILLA_REPO']
        else:
            # Fallback to using .hgrc as hgtool/share needs the repo
            import ConfigParser
            config = ConfigParser.ConfigParser()
            config_path = os.path.join(topsrcdir, 'mozilla', '.hg', 'hgrc')
            config.read([config_path])
            if not config.has_option('paths', 'default'):
                # Abort, not to get into a possibly inconsistent state.
                sys.exit("Error: default path in %s is undefined!" %
                         config_path)

            options.mozilla_repo = config.get('paths', 'default')

    # If MOZILLA_REV is passed via environment, prefer that over the passed
    # option so that automation can pass tagged versions while still defaulting
    # to a certain revision via client.py-args.
    envRev = os.environ.get("MOZILLA_REV")
    if envRev:
        if options.mozilla_rev and options.mozilla_rev != envRev:
            print "Warning: Preferring MOZILLA_REV (%s) over passed revision (%s)" % (envRev, options.mozilla_rev)
        else:
            print "Using MOZILLA_REV from environment (%s)" % envRev
        options.mozilla_rev = envRev

    # If no version was set before, use the default mozilla revision.
    if options.mozilla_rev is None:
        options.mozilla_rev = get_DEFAULT_tag("MOZILLA_REV")


def fixup_chatzilla_repo_options(options):
    """Handle special case: initial hg checkout of Chatzilla.

    See fixup_comm_repo_options().
    backup_cvs_extension() is also called.
    """

    extensionPath = os.path.join(topsrcdir, 'mozilla', 'extensions', 'irc')

    backup_cvs_extension('Chatzilla', 'irc', extensionPath)

    if options.chatzilla_repo is None and not os.path.exists(extensionPath):
        options.chatzilla_repo = DEFAULTS['CHATZILLA_REPO']

    if options.chatzilla_rev is None:
        options.chatzilla_rev = get_DEFAULT_tag("CHATZILLA_REV")


def fixup_inspector_repo_options(options):
    """Handle special case: initial checkout of DOM Inspector.

    See fixup_comm_repo_options().
    """

    # No cvs backup needed as DOM Inspector was part (and removed from)
    # Mozilla hg repository.
    if options.inspector_repo is None and \
            not os.path.exists(os.path.join(topsrcdir, 'mozilla', 'extensions',
                                            'inspector')):
        options.inspector_repo = DEFAULTS['INSPECTOR_REPO']

    if options.inspector_rev is None:
        options.inspector_rev = get_DEFAULT_tag("INSPECTOR_REV")


def get_last_known_good_mozilla_rev():
    kg_url = "http://build.mozillamessaging.com/buildbot/production/known-good-revisions/mozilla-central.txt"
    try:
        rev = urllib2.urlopen(kg_url).read().strip()
    except IOError, err:
        sys.exit("Error: could not fetch '%s' (%s)" % (kg_url, err))
    if re.search(r'^[a-f0-9]+$', rev) and len(rev) == 12:
        return rev
    else:
        sys.exit("Error: invalid contents fetched from %s: '%s'" %
                 (kg_url, rev))

try:
    (options, (action,)) = o.parse_args()
except ValueError:
    o.print_help()
    sys.exit(2)

if options.default_rev:
    # We now wish to override all the DEFAULTS.
    DEFAULTS['REV'] = options.default_rev
    for index in ['CHATZILLA', 'INSPECTOR', 'COMM', 'MOZILLA']:
        index += "_REV"
        # Clear the rest from file-defaults
        if index in DEFAULTS:
            del DEFAULTS[index]

if action in ('checkout', 'co'):
    # Update Comm repository configuration.
    repo_config()

    if not options.skip_comm:
        fixup_comm_repo_options(options)
        do_hg_pull('.', options.comm_repo, options.hg, options.comm_rev)

    if not options.skip_mozilla:
        if options.known_good and options.mozilla_rev is None:
            print "Fetching last known good mozilla revision"
            options.mozilla_rev = get_last_known_good_mozilla_rev()
            print "Setting mozilla_rev to '%s'" % options.mozilla_rev

        fixup_mozilla_repo_options(options)
        do_hg_pull('mozilla', options.mozilla_repo, options.hg,
                   options.mozilla_rev, options.hgtool, options.hgtool1)

    # Check whether destination directory exists for these extensions.
    if (not options.skip_chatzilla or not options.skip_inspector) and \
       not os.path.exists(os.path.join(topsrcdir, 'mozilla', 'extensions')):
        # Don't create the directory: Mozilla repository should provide it...
        sys.exit("Error: mozilla/extensions directory does not exist;" +
                 " ChatZilla, and/or DOM Inspector cannot be checked out!")

    if not options.skip_chatzilla:
        fixup_chatzilla_repo_options(options)
        do_hg_pull(os.path.join('mozilla', 'extensions', 'irc'),
                   options.chatzilla_repo, options.hg, options.chatzilla_rev)

    if not options.skip_inspector:
        fixup_inspector_repo_options(options)
        do_hg_pull(os.path.join('mozilla', 'extensions', 'inspector'),
                   options.inspector_repo, options.hg, options.inspector_rev)

    if options.apply_patches:
        do_apply_patches(topsrcdir, options.hg)

else:
    o.print_help()
    sys.exit(2)