git-review

#!/usr/bin/env python
from __future__ import print_function

COPYRIGHT = """\
Copyright (C) 2011-2012 OpenStack LLC.

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."""

import datetime
import json
import os
import re
import shlex
import subprocess
import sys
import time

if sys.version < '3':
    from urllib import urlopen
    from urlparse import urlparse
    import ConfigParser
    do_input = raw_input
else:
    from urllib.request import urlopen
    from urllib.parse import urlparse
    import configparser as ConfigParser
    do_input = input

from distutils.version import StrictVersion

version = "1.19"

VERBOSE = False
UPDATE = False
CONFIGDIR = os.path.expanduser("~/.config/git-review")
GLOBAL_CONFIG = "/etc/git-review/git-review.conf"
PYPI_URL = "http://pypi.python.org/pypi/git-review/json"
PYPI_CACHE_TIME = 60 * 60 * 24  # 24 hours

_branch_name = None
_has_color = None


class colors:
    yellow = '\033[33m'
    green = '\033[92m'
    reset = '\033[0m'


class GitReviewException(Exception):
    pass


class CommandFailed(GitReviewException):

    def __init__(self, *args):
        Exception.__init__(self, *args)
        (rc, output, argv, envp) = args
        self.quickmsg = dict([
            ("argv", " ".join(argv)),
            ("rc", rc),
            ("output", output)])

    def __str__(self):
        return self.__doc__ + """
The following command failed with exit code %(rc)d
    "%(argv)s"
-----------------------
%(output)s
-----------------------""" % self.quickmsg


class ChangeSetException(GitReviewException):

    def __init__(self, e):
        GitReviewException.__init__(self)
        self.e = str(e)

    def __str__(self):
        return self.__doc__ % self.e


def run_command_status(*argv, **env):
    if VERBOSE:
        print(datetime.datetime.now(), "Running:", " ".join(argv))
    if len(argv) == 1:
        argv = shlex.split(str(argv[0]))
    newenv = os.environ
    newenv.update(env)
    p = subprocess.Popen(argv, stdout=subprocess.PIPE,
                         stderr=subprocess.STDOUT, env=newenv)
    (out, nothing) = p.communicate()
    out = out.decode('utf-8')
    return (p.returncode, out.strip())


def run_command(*argv, **env):
    (rc, output) = run_command_status(*argv, **env)
    return output


def run_command_exc(klazz, *argv, **env):
    """Run command *argv, on failure raise 'klazz

    klass should be derived from CommandFailed"""
    (rc, output) = run_command_status(*argv, **env)
    if rc != 0:
        raise klazz(rc, output, argv, env)
    return output


def update_latest_version(version_file_path):
    """ Cache the latest version of git-review for the upgrade check. """

    if not os.path.exists(CONFIGDIR):
        os.makedirs(CONFIGDIR)

    if os.path.exists(version_file_path) and not UPDATE:
        if (time.time() - os.path.getmtime(version_file_path)) < 28800:
            return

    latest_version = version
    try:
        latest_version = json.load(urlopen(PYPI_URL))['info']['version']
    except:
        pass

    with open(version_file_path, "w") as version_file:
        version_file.write(latest_version)


def latest_is_newer():
    """ Check if there is a new version of git-review. """

    # Skip version check if distro package turns it off
    if os.path.exists(GLOBAL_CONFIG):
        config = dict(check=False)
        configParser = ConfigParser.ConfigParser(config)
        configParser.read(GLOBAL_CONFIG)
        if not configParser.getboolean("updates", "check"):
            return False

    version_file_path = os.path.join(CONFIGDIR, "latest-version")
    update_latest_version(version_file_path)

    latest_version = None
    with open(version_file_path, "r") as version_file:
        latest_version = StrictVersion(version_file.read())
    if latest_version > StrictVersion(version):
        return True
    return False


def get_hooks_target_file():
    top_dir = run_command('git rev-parse --git-dir')
    hooks_dir = os.path.join(top_dir, "hooks")
    return os.path.join(hooks_dir, "commit-msg")


class CannotInstallHook(CommandFailed):
    "Problems encountered installing commit-msg hook"
    EXIT_CODE = 2


def set_hooks_commit_msg(remote, target_file):
    """ Install the commit message hook if needed. """

    # Create the hooks directory if it's not there already
    hooks_dir = os.path.dirname(target_file)
    if not os.path.isdir(hooks_dir):
        os.mkdir(hooks_dir)

    (hostname, username, port, project_name) = \
        parse_git_show(remote, "Push")

    if not os.path.exists(target_file) or UPDATE:
        if VERBOSE:
            print("Fetching commit hook from: scp://%s:%s" % (hostname, port))
        if port is not None:
            port = "-P %s" % port
        else:
            port = ""
        if username is None:
            userhost = hostname
        else:
            userhost = "%s@%s" % (username, hostname)
        run_command_exc(
            CannotInstallHook,
            "scp", port,
            userhost + ":hooks/commit-msg",
            target_file)

    if not os.access(target_file, os.X_OK):
        os.chmod(target_file, os.path.stat.S_IREAD | os.path.stat.S_IEXEC)


def test_remote(username, hostname, port, project):
    """ Tests that a possible gerrit remote works """

    if port is not None:
        port = "-p %s" % port
    else:
        port = ""
    if username is None:
        userhost = hostname
    else:
        userhost = "%s@%s" % (username, hostname)

    (status, ssh_output) = run_command_status(
        "ssh", "-x", port, userhost,
        "gerrit", "ls-projects")

    if status == 0:
        if VERBOSE:
            print("%s@%s:%s worked." % (username, hostname, port))
        return True
    else:
        if VERBOSE:
            print("%s@%s:%s did not work." % (username, hostname, port))
        return False


def make_remote_url(username, hostname, port, project):
    """ Builds a gerrit remote URL """
    if username is None:
        return "ssh://%s:%s/%s" % (hostname, port, project)
    else:
        return "ssh://%s@%s:%s/%s" % (username, hostname, port, project)


def add_remote(hostname, port, project, remote):
    """ Adds a gerrit remote. """
    asked_for_username = False

    username = os.getenv("USERNAME")
    if not username:
        username = run_command('git config --get gitreview.username')
    if not username:
        username = os.getenv("USER")
    if port is None:
        port = 29418

    remote_url = make_remote_url(username, hostname, port, project)
    if VERBOSE:
        print("No remote set, testing %s" % remote_url)
    if not test_remote(username, hostname, port, project):
        print("Could not connect to gerrit.")
        username = do_input("Enter your gerrit username: ")
        remote_url = make_remote_url(username, hostname, port, project)
        print("Trying again with %s" % remote_url)
        if not test_remote(username, hostname, port, project):
            raise Exception("Could not connect to gerrit at %s" % remote_url)
        asked_for_username = True

    print("Creating a git remote called \"%s\" that maps to:" % remote)
    print("\t%s" % remote_url)
    cmd = "git remote add -f %s %s" % (remote, remote_url)
    (status, remote_output) = run_command_status(cmd)

    if status != 0:
        raise Exception("Error running %s" % cmd)

    if asked_for_username:
        print()
        print("This repository is now set up for use with git-review.")
        print("You can set the default username for future repositories with:")
        print('  git config --global --add gitreview.username "%s"' % username)
        print()


def parse_git_show(remote, verb):
    fetch_url = ""
    for line in run_command("git remote show -n %s" % remote).split("\n"):
        if line.strip().startswith("%s" % verb):
            fetch_url = line.split()[2]

    parsed_url = urlparse(fetch_url)
    project_name = parsed_url.path.lstrip("/")
    if project_name.endswith(".git"):
        project_name = project_name[:-4]

    hostname = parsed_url.netloc
    username = None
    port = parsed_url.port

    if VERBOSE:
        print("Found origin %s URL:" % verb, fetch_url)

    # Workaround bug in urlparse on OSX
    if parsed_url.scheme == "ssh" and parsed_url.path[:2] == "//":
        hostname = parsed_url.path[2:].split("/")[0]

    if "@" in hostname:
        (username, hostname) = hostname.split("@")
    if ":" in hostname:
        (hostname, port) = hostname.split(":")

    # Is origin an ssh location? Let's pull more info
    if parsed_url.scheme == "ssh" and port is None:
        port = 22

    return (hostname, username, str(port), project_name)


def git_config_get_value(section, option):
    cmd = "git config --get %s.%s" % (section, option)
    return run_command(cmd).strip()


def check_color_support():
    global _has_color
    if _has_color is None:
        test_command = "git log --color=never --oneline HEAD^1..HEAD"
        (status, output) = run_command_status(test_command)
        if status == 0:
            _has_color = True
        else:
            _has_color = False
    return _has_color


def get_config():
    """Get the configuration options set in the .gitremote file, if present."""
    """Returns a hashmap with hostname, port, project and defaultbranch."""
    """If there is no .gitremote file, default values will be used."""
    config = dict(hostname=False, port='29418', project=False,
                  defaultbranch='master', defaultremote="gerrit",
                  defaultrebase="1")
    top_dir = run_command('git rev-parse --show-toplevel')
    target_file = os.path.join(top_dir, ".gitreview")
    if os.path.exists(target_file):
        configParser = ConfigParser.ConfigParser(config)
        configParser.read(target_file)
        config['hostname'] = configParser.get("gerrit", "host")
        config['port'] = configParser.get("gerrit", "port")
        config['project'] = configParser.get("gerrit", "project")
        config['defaultbranch'] = configParser.get("gerrit", "defaultbranch")
        if configParser.has_option("gerrit", "defaultremote"):
            config['defaultremote'] = configParser.get("gerrit",
                                                       "defaultremote")
        if configParser.has_option("gerrit", "defaultrebase"):
            config['defaultrebase'] = configParser.getboolean("gerrit",
                                                              "defaultrebase")
    return config


def update_remote(remote):
    cmd = "git remote update %s" % remote
    (status, output) = run_command_status(cmd)
    if VERBOSE:
        print(output)
    if status != 0:
        print("Problem running '%s'" % cmd)
        if not VERBOSE:
            print(output)
        return False
    return True


def check_remote(branch, remote, hostname, port, project):
    """Check that a Gerrit Git remote repo exists, if not, set one."""

    has_color = check_color_support()
    if has_color:
        color_never = "--color=never"
    else:
        color_never = ""

    if remote in run_command("git remote").split("\n"):

        remotes = run_command("git branch -a %s" % color_never).split("\n")
        for current_remote in remotes:
            if (current_remote.strip() == "remotes/%s/%s" % (remote, branch)
                and not UPDATE):
                return
        # We have the remote, but aren't set up to fetch. Fix it
        if VERBOSE:
            print("Setting up gerrit branch tracking for better rebasing")
        update_remote(remote)
        return

    if hostname is False or port is False or project is False:
        # This means there was no .gitreview file
        print("No '.gitreview' file found in this repository.")
        print("We don't know where your gerrit is. Please manually create ")
        print("a remote named gerrit and try again.")
        sys.exit(1)

    # Gerrit remote not present, try to add it
    try:
        add_remote(hostname, port, project, remote)
    except:
        print(sys.exc_info()[2])
        print("We don't know where your gerrit is. Please manually create ")
        print("a remote named \"%s\" and try again." % remote)
        raise


def rebase_changes(branch, remote):

    remote_branch = "remotes/%s/%s" % (remote, branch)

    if not update_remote(remote):
        return False

    cmd = "git rebase -i %s" % remote_branch
    (status, output) = run_command_status(cmd, GIT_EDITOR='true')
    if status != 0:
        print("Errors running %s" % cmd)
        print(output)
        return False
    return True


def undo_rebase():
    cmd = "git reset --hard ORIG_HEAD"
    (status, output) = run_command_status(cmd)
    if status != 0:
        print("Errors running %s" % cmd)
        print(output)
        return False
    return True


def get_branch_name(target_branch):
    global _branch_name
    if _branch_name is not None:
        return _branch_name
    _branch_name = None
    has_color = check_color_support()
    if has_color:
        color_never = "--color=never"
    else:
        color_never = ""
    for branch in run_command("git branch %s" % color_never).split("\n"):
        if branch.startswith('*'):
            _branch_name = branch.split()[1].strip()
    if _branch_name == "(no":
        _branch_name = target_branch
    return _branch_name


def assert_one_change(remote, branch, yes, have_hook):
    update_remote(remote)
    branch_name = get_branch_name(branch)
    has_color = check_color_support()
    if has_color:
        color = git_config_get_value("color", "ui").lower()
        if(color == "" or color == "true"):
            color = "auto"
        elif color == "false":
            color = "never"
        elif color == "auto":
            # Python is not a tty, we have to force colors
            color = "always"
        use_color = "--color=%s" % color
    else:
        use_color = ""
    cmd = "git log %s --decorate --oneline %s --not remotes/%s/%s" % (
        use_color, branch_name, remote, branch)
    (status, output) = run_command_status(cmd)
    if status != 0:
        print("Had trouble running %s" % cmd)
        print(output)
        sys.exit(1)
    output_lines = len(output.split("\n"))
    if output_lines == 1 and not have_hook:
        print("Your change was committed before the commit hook was installed")
        print("Amending the commit to add a gerrit change id")
        run_command("git commit --amend", GIT_EDITOR='true')
    elif output_lines == 0:
        print("No changes between HEAD and %s/%s." % (remote, branch))
        print("Submitting for review would be pointless.")
        sys.exit(1)
    elif output_lines > 1:
        if not yes:
            print("You have more than one commit"
                  " that you are about to submit.")
            print("The outstanding commits are:\n\n%s\n" % output)
            print("Is this really what you meant to do?")
            yes_no = do_input("Type 'yes' to confirm: ")
            if yes_no.lower().strip() != "yes":
                print("Aborting.")
                print("Please rebase/squash your changes and try again")
                sys.exit(1)


def get_topic(target_branch):

    branch_name = get_branch_name(target_branch)

    branch_parts = branch_name.split("/")
    if len(branch_parts) >= 3 and branch_parts[0] == "review":
        return "/".join(branch_parts[2:])

    log_output = run_command("git log HEAD^1..HEAD")
    bug_re = r'\b([Bb]ug|[Ll][Pp])\s*[#:]?\s*(\d+)'

    match = re.search(bug_re, log_output)
    if match is not None:
        return "bug/%s" % match.group(2)

    bp_re = r'\b([Bb]lue[Pp]rint|[Bb][Pp])\s*[#:]?\s*([0-9a-zA-Z-_]+)'
    match = re.search(bp_re, log_output)
    if match is not None:
        return "bp/%s" % match.group(2)

    return branch_name


class CannotQueryOpenChangesets(CommandFailed):
    "Cannot fetch review information from gerrit"
    EXIT_CODE = 32


class CannotParseOpenChangesets(ChangeSetException):
    "Cannot parse JSON review information from gerrit"
    EXIT_CODE = 33


def list_reviews(remote):

    (hostname, username, port, project_name) = \
        parse_git_show(remote, "Push")

    if port is not None:
        port = "-p %s" % port
    else:
        port = ""
    if username is None:
        userhost = hostname
    else:
        userhost = "%s@%s" % (username, hostname)

    review_info = None
    output = run_command_exc(
        CannotQueryOpenChangesets,
        "ssh", "-x", port, userhost,
        "gerrit", "query",
        "--format=JSON project:%s status:open" % project_name)

    review_list = []
    review_field_width = {}
    REVIEW_FIELDS = ('number', 'branch', 'subject')
    FIELDS = range(0, len(REVIEW_FIELDS))
    if check_color_support():
        review_field_color = (colors.yellow, colors.green, "")
        color_reset = colors.reset
    else:
        review_field_color = ("", "", "")
        color_reset = ""
    review_field_width = [0, 0, 0]
    review_field_format = ["%*s", "%*s", "%*s"]
    review_field_justify = [+1, +1, -1]  # -1 is justify to right

    for line in output.split("\n"):
        # Warnings from ssh wind up in this output
        if line[0] != "{":
            print(line)
            continue
        try:
            review_info = json.loads(line)
        except:
            if VERBOSE:
                print(output)
            raise(CannotParseOpenChangesets, sys.exc_info()[1])

        if 'type' in review_info:
            break

        review_list.append([review_info[f] for f in REVIEW_FIELDS])
        for i in FIELDS:
            review_field_width[i] = max(
                review_field_width[i],
                len(review_info[REVIEW_FIELDS[i]])
            )

    review_field_format = "  ".join([
        review_field_color[i] +
        review_field_format[i] +
        color_reset
        for i in FIELDS])

    review_field_width = [
        review_field_width[i] * review_field_justify[i]
        for i in FIELDS]
    for review_value in review_list:
        # At this point we have review_field_format
        # like "%*s %*s %*s" and we need to supply
        # (width1, value1, width2, value2, ...) tuple to print
        # It's easy to zip() widths with actual values,
        # but we need to flatten the resulting
        #  ((width1, value1), (width2, value2), ...) map.
        formatted_fields = []
        for (width, value) in zip(review_field_width, review_value):
            formatted_fields.extend([width, value])
        print(review_field_format % tuple(formatted_fields))
    print("Found %d items for review" % review_info['rowCount'])

    return 0


class CannotQueryPatchSet(CommandFailed):
    "Cannot query patchset information"
    EXIT_CODE = 34


class PatchSetInformationNotFound(ChangeSetException):
    "Could not fetch review information for change %s"
    EXIT_CODE = 35


class PatchSetNotFound(ChangeSetException):
    "Gerrit review %s not found"
    EXIT_CODE = 36


class PatchSetGitFetchFailed(CommandFailed):
    """Cannot fetch patchset contents

Does specified change number belong to this project?"""
    EXIT_CODE = 37


class CheckoutNewBranchFailed(CommandFailed):
    "Cannot checkout to new branch"
    EXIT_CODE = 64


class CheckoutExistingBranchFailed(CommandFailed):
    "Cannot checkout existing branch"
    EXIT_CODE = 65


class ResetHardFailed(CommandFailed):
    "Failed to hard reset downloaded branch"
    EXIT_CODE = 66


def download_review(review, masterbranch, remote):

    (hostname, username, port, project_name) = \
        parse_git_show(remote, "Push")

    if port is not None:
        port = "-p %s" % port
    else:
        port = ""
    if username is None:
        userhost = hostname
    else:
        userhost = "%s@%s" % (username, hostname)

    review_info = None
    output = run_command_exc(
        CannotQueryPatchSet,
        "ssh", "-x", port, userhost,
        "gerrit", "query",
        "--format=JSON --current-patch-set change:%s" % review)

    review_jsons = output.split("\n")
    found_review = False
    for review_json in review_jsons:
        try:
            review_info = json.loads(review_json)
            found_review = True
        except:
            pass
        if found_review:
            break
    if not found_review:
        if VERBOSE:
            print(output)
        raise PatchSetInformationNotFound(review)

    try:
        revision = review_info['currentPatchSet']['revision']
        refspec = review_info['currentPatchSet']['ref']
    except KeyError:
        raise PatchSetNotFound(review)

    try:
        topic = review_info['topic']
        if topic == masterbranch:
            topic = review
    except KeyError:
        topic = review
    if review_info.get('owner'):
        author = re.sub('\W+', '_', review_info['owner']['name']).lower()
    else:
        author = 'unknown'
    branch_name = "review/%s/%s" % (author, topic)

    print("Downloading %s from gerrit into %s" % (refspec, branch_name))
    run_command_exc(PatchSetGitFetchFailed,
                    "git", "fetch", remote, refspec)

    try:
        output = run_command_exc(CheckoutNewBranchFailed,
                                 "git", "checkout", "-b",
                                 branch_name, "FETCH_HEAD")

    except CheckoutNewBranchFailed, e:
        if re.search("already exists\.?", output):
            print("Branch already exists - reusing")
            run_command_exc(CheckoutExistingBranchFailed,
                            "git", "checkout", branch_name)
            run_command_exc(ResetHardFailed,
                            "git", "reset", "--hard", "FETCH_HEAD")
        else:
            raise

    print("Switched to branch '%s'" % branch_name)


class CheckoutBackExistingBranchFailed(CommandFailed):
    "Cannot switch back to existing branch"
    EXIT_CODE = 67


class DeleteBranchFailed(CommandFailed):
    "Failed to delete branch"
    EXIT_CODE = 68


def finish_branch(target_branch):
    local_branch = get_branch_name(target_branch)
    if VERBOSE:
        print("Switching back to '%s' and deleting '%s'" % (target_branch,
                                                            local_branch))
    run_command_exc(CheckoutBackExistingBranchFailed,
                    "git", "checkout", target_branch)
    print("Switched to branch '%s'" % target_branch)

    run_command_exc(DeleteBranchFailed,
                    "git", "branch", "-D", local_branch)
    print("Deleted branch '%s'" % local_branch)


def print_exit_message(status, needs_update):

    if needs_update:
        print("""
***********************************************************
A new version of git-review is available on PyPI. Please
update your copy with:

  pip install -U git-review

to ensure proper behavior with gerrit. Thanks!
***********************************************************
""")
    sys.exit(status)


def main():

    config = get_config()

    usage = "git review [OPTIONS] ... [BRANCH]"

    import argparse
    parser = argparse.ArgumentParser(usage=usage, description=COPYRIGHT)

    parser.add_argument("-t", "--topic", dest="topic",
                        help="Topic to submit branch to")
    parser.add_argument("-D", "--draft", dest="draft", action="store_true",
                        help="Submit review as a draft")
    parser.add_argument("-c", "--compatible", dest="compatible",
                        action="store_true",
                        help="Push change to refs/for/* for compatibility "
                             "with Gerrit versions < 2.3. Ignored if "
                             "-D/--draft is used.")
    parser.add_argument("-n", "--dry-run", dest="dry", action="store_true",
                        help="Don't actually submit the branch for review")
    parser.add_argument("-i", "--new-changeid", dest="regenerate",
                        action="store_true",
                        help="Regenerate Change-id before submitting")
    parser.add_argument("-r", "--remote", dest="remote",
                        help="git remote to use for gerrit")
    parser.add_argument("-R", "--no-rebase", dest="rebase",
                        action="store_false",
                        help="Don't rebase changes before submitting.")
    parser.add_argument("-F", "--force-rebase", dest="force_rebase",
                        action="store_true",
                        help="Force rebase even when not needed.")
    parser.add_argument("-d", "--download", dest="download",
                        help="Download the contents of an existing gerrit "
                             "review into a branch")
    parser.add_argument("-u", "--update", dest="update", action="store_true",
                        help="Force updates from remote locations")
    parser.add_argument("-s", "--setup", dest="setup", action="store_true",
                        help="Just run the repo setup commands but don't "
                             "submit anything")
    parser.add_argument("-f", "--finish", dest="finish", action="store_true",
                        help="Close down this branch and switch back to "
                             "master on successful submission")
    parser.add_argument("-l", "--list", dest="list", action="store_true",
                        help="List available reviews for the current project")
    parser.add_argument("-y", "--yes", dest="yes", action="store_true",
                        help="Indicate that you do, in fact, understand if "
                             "you are submitting more than one patch")
    parser.add_argument("-v", "--verbose", dest="verbose", action="store_true",
                        help="Output more information about what's going on")
    parser.add_argument("--license", dest="license", action="store_true",
                        help="Print the license and exit")
    parser.add_argument("--version", action="version",
                        version='%s version %s' %
                        (os.path.split(sys.argv[0])[-1], version))
    parser.add_argument("branch", nargs="?", default=config['defaultbranch'])
    parser.set_defaults(dry=False,
                        draft=False,
                        rebase=config['defaultrebase'],
                        verbose=False,
                        update=False,
                        setup=False,
                        list=False,
                        yes=False,
                        remote=config['defaultremote'])

    options = parser.parse_args()

    if options.license:
        print(COPYRIGHT)
        sys.exit(0)

    branch = options.branch
    global VERBOSE
    global UPDATE
    VERBOSE = options.verbose
    UPDATE = options.update
    remote = options.remote
    yes = options.yes
    status = 0

    needs_update = latest_is_newer()
    check_remote(branch, remote,
                 config['hostname'], config['port'], config['project'])

    if options.download is not None:
        download_review(options.download, branch, remote)
        return
    elif options.list:
        list_reviews(remote)
        return

    topic = options.topic
    if topic is None:
        topic = get_topic(branch)
    if VERBOSE:
        print("Found topic '%s' from parsing changes." % topic)

    hook_file = get_hooks_target_file()

    have_hook = os.path.exists(hook_file) and os.access(hook_file, os.X_OK)

    if not have_hook:
        set_hooks_commit_msg(remote, hook_file)

    if options.setup:
        if options.finish and not options.dry:
            finish_branch(branch)
        return

    if options.rebase:
        if not rebase_changes(branch, remote):
            print_exit_message(1, needs_update)
        if not options.force_rebase and not undo_rebase():
            print_exit_message(1, needs_update)
    assert_one_change(remote, branch, yes, have_hook)

    ref = "publish"

    if options.draft:
        ref = "drafts"
    elif options.compatible:
        ref = "for"

    cmd = "git push %s HEAD:refs/%s/%s/%s" % (remote, ref, branch,
                                              topic)
    if options.regenerate:
        print("Amending the commit to regenerate the change id\n")
        regenerate_cmd = "git commit --amend"
        if options.dry:
            print("\tGIT_EDITOR=\"sed -i -e '/^Change-Id:/d'\" %s\n" %
                  regenerate_cmd)
        else:
            run_command(regenerate_cmd,
                        GIT_EDITOR="sed -i -e "
                        "'/^Change-Id:/d'")

    if options.dry:
        print("Please use the following command "
              "to send your commits to review:\n")
        print("\t%s\n" % cmd)
    else:
        (status, output) = run_command_status(cmd)
        print(output)

    if options.finish and not options.dry and status == 0:
        finish_branch(branch)
        return

    print_exit_message(status, needs_update)


if __name__ == "__main__":
    try:
        main()
    except GitReviewException, e:
        print(e)
        sys.exit(e.EXIT_CODE)