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#!/usr/bin/env python3
# Copyright 2013 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import argparse
import datetime
from distutils.version import LooseVersion
import glob
import json
import os
import re
import shutil
import subprocess
import sys
import time
import urllib
from git_recipes import GitRecipesMixin
from git_recipes import GitFailedException
import http.client as httplib
import urllib.request as urllib2
DAY_IN_SECONDS = 24 * 60 * 60
PUSH_MSG_GIT_RE = re.compile(r".* \(based on (?P<git_rev>[a-fA-F0-9]+)\)$")
PUSH_MSG_NEW_RE = re.compile(r"^Version \d+\.\d+\.\d+$")
VERSION_FILE = os.path.join("include", "v8-version.h")
WATCHLISTS_FILE = "WATCHLISTS"
RELEASE_WORKDIR = "/tmp/v8-release-scripts-work-dir/"
# V8 base directory.
V8_BASE = os.path.dirname(
os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
# Add our copy of depot_tools to the PATH as many scripts use tools from there,
# e.g. git-cl, fetch, git-new-branch etc, and we can not depend on depot_tools
# being in the PATH on the LUCI bots.
path_to_depot_tools = os.path.join(V8_BASE, 'third_party', 'depot_tools')
new_path = path_to_depot_tools + os.pathsep + os.environ.get('PATH')
os.environ['PATH'] = new_path
def TextToFile(text, file_name):
with open(file_name, "w") as f:
f.write(text)
def AppendToFile(text, file_name):
with open(file_name, "a") as f:
f.write(text)
def LinesInFile(file_name):
with open(file_name) as f:
for line in f:
yield line
def FileToText(file_name):
with open(file_name) as f:
return f.read()
def MSub(rexp, replacement, text):
return re.sub(rexp, replacement, text, flags=re.MULTILINE)
# Some commands don't like the pipe, e.g. calling vi from within the script or
# from subscripts like git cl upload.
def Command(cmd, args="", prefix="", pipe=True, cwd=None):
cwd = cwd or os.getcwd()
# TODO(machenbach): Use timeout.
cmd_line = "%s %s %s" % (prefix, cmd, args)
print("Command: %s" % cmd_line)
print("in %s" % cwd)
sys.stdout.flush()
try:
if pipe:
return subprocess.check_output(cmd_line, shell=True, cwd=cwd).decode('utf-8')
else:
return subprocess.check_call(cmd_line, shell=True, cwd=cwd)
except subprocess.CalledProcessError:
return None
finally:
sys.stdout.flush()
sys.stderr.flush()
def SanitizeVersionTag(tag):
version_without_prefix = re.compile(r"^\d+\.\d+\.\d+(?:\.\d+)?$")
version_with_prefix = re.compile(r"^tags\/\d+\.\d+\.\d+(?:\.\d+)?$")
if version_without_prefix.match(tag):
return tag
elif version_with_prefix.match(tag):
return tag[len("tags/"):]
else:
return None
def NormalizeVersionTags(version_tags):
normalized_version_tags = []
# Remove tags/ prefix because of packed refs.
for current_tag in version_tags:
version_tag = SanitizeVersionTag(current_tag)
if version_tag is not None:
normalized_version_tags.append(version_tag)
return normalized_version_tags
# Wrapper for side effects.
class SideEffectHandler(object): # pragma: no cover
def Call(self, fun, *args, **kwargs):
return fun(*args, **kwargs)
def Command(self, cmd, args="", prefix="", pipe=True, cwd=None):
return Command(cmd, args, prefix, pipe, cwd=cwd)
def ReadLine(self):
sys.stdout.flush()
return sys.stdin.readline().strip()
def ReadURL(self, url, params=None):
# pylint: disable=E1121
url_fh = urllib2.urlopen(url, params, 60)
try:
return url_fh.read()
finally:
url_fh.close()
def ReadClusterFuzzAPI(self, api_key, **params):
params["api_key"] = api_key.strip()
params = urllib.urlencode(params)
headers = {"Content-type": "application/x-www-form-urlencoded"}
conn = httplib.HTTPSConnection("backend-dot-cluster-fuzz.appspot.com")
conn.request("POST", "/_api/", params, headers)
response = conn.getresponse()
data = response.read()
try:
return json.loads(data)
except:
print(data)
print("ERROR: Could not read response. Is your key valid?")
raise
def Sleep(self, seconds):
time.sleep(seconds)
def GetUTCStamp(self):
return time.mktime(datetime.datetime.utcnow().timetuple())
DEFAULT_SIDE_EFFECT_HANDLER = SideEffectHandler()
class NoRetryException(Exception):
pass
class VCInterface(object):
def InjectStep(self, step):
self.step=step
def Pull(self):
raise NotImplementedError()
def Fetch(self):
raise NotImplementedError()
def GetTags(self):
raise NotImplementedError()
def GetBranches(self):
raise NotImplementedError()
def MainBranch(self):
raise NotImplementedError()
def CandidateBranch(self):
raise NotImplementedError()
def RemoteMainBranch(self):
raise NotImplementedError()
def RemoteCandidateBranch(self):
raise NotImplementedError()
def RemoteBranch(self, name):
raise NotImplementedError()
def CLLand(self):
raise NotImplementedError()
def Tag(self, tag, remote, message):
"""Sets a tag for the current commit.
Assumptions: The commit already landed and the commit message is unique.
"""
raise NotImplementedError()
class GitInterface(VCInterface):
def Pull(self):
self.step.GitPull()
def Fetch(self):
self.step.Git("fetch")
def GetTags(self):
return self.step.Git("tag").strip().splitlines()
def GetBranches(self):
# Get relevant remote branches, e.g. "branch-heads/3.25".
branches = filter(
lambda s: re.match(r"^branch\-heads/\d+\.\d+$", s),
self.step.GitRemotes())
# Remove 'branch-heads/' prefix.
return [b[13:] for b in branches]
def MainBranch(self):
return "main"
def CandidateBranch(self):
return "candidates"
def RemoteMainBranch(self):
return "origin/main"
def RemoteCandidateBranch(self):
return "origin/candidates"
def RemoteBranch(self, name):
# Assume that if someone "fully qualified" the ref, they know what they
# want.
if name.startswith('refs/'):
return name
if name in ["candidates", "main"]:
return "refs/remotes/origin/%s" % name
try:
# Check if branch is in heads.
if self.step.Git("show-ref refs/remotes/origin/%s" % name).strip():
return "refs/remotes/origin/%s" % name
except GitFailedException:
pass
try:
# Check if branch is in branch-heads.
if self.step.Git("show-ref refs/remotes/branch-heads/%s" % name).strip():
return "refs/remotes/branch-heads/%s" % name
except GitFailedException:
pass
self.Die("Can't find remote of %s" % name)
def Tag(self, tag, remote, message):
# Wait for the commit to appear. Assumes unique commit message titles (this
# is the case for all automated merge and push commits - also no title is
# the prefix of another title).
commit = None
for wait_interval in [10, 30, 60, 60, 60, 60, 60]:
self.step.Git("fetch")
commit = self.step.GitLog(n=1, format="%H", grep=message, branch=remote)
if commit:
break
print("The commit has not replicated to git. Waiting for %s seconds." %
wait_interval)
self.step._side_effect_handler.Sleep(wait_interval)
else:
self.step.Die("Couldn't determine commit for setting the tag. Maybe the "
"git updater is lagging behind?")
self.step.Git("tag %s %s" % (tag, commit))
self.step.Git("push origin refs/tags/%s:refs/tags/%s" % (tag, tag))
def CLLand(self):
self.step.GitCLLand()
class Step(GitRecipesMixin):
def __init__(self, text, number, config, state, options, handler):
self._text = text
self._number = number
self._config = config
self._state = state
self._options = options
self._side_effect_handler = handler
self.vc = GitInterface()
self.vc.InjectStep(self)
# The testing configuration might set a different default cwd.
self.default_cwd = (self._config.get("DEFAULT_CWD") or
os.path.join(self._options.work_dir, "v8"))
assert self._number >= 0
assert self._config is not None
assert self._state is not None
assert self._side_effect_handler is not None
def __getitem__(self, key):
# Convenience method to allow direct [] access on step classes for
# manipulating the backed state dict.
return self._state.get(key)
def __setitem__(self, key, value):
# Convenience method to allow direct [] access on step classes for
# manipulating the backed state dict.
self._state[key] = value
def Config(self, key):
return self._config[key]
def Run(self):
# Restore state.
state_file = "%s-state.json" % self._config["PERSISTFILE_BASENAME"]
if not self._state and os.path.exists(state_file):
self._state.update(json.loads(FileToText(state_file)))
print(">>> Step %d: %s" % (self._number, self._text))
try:
return self.RunStep()
finally:
# Persist state.
TextToFile(json.dumps(self._state), state_file)
def RunStep(self): # pragma: no cover
raise NotImplementedError
def Retry(self, cb, retry_on=None, wait_plan=None):
""" Retry a function.
Params:
cb: The function to retry.
retry_on: A callback that takes the result of the function and returns
True if the function should be retried. A function throwing an
exception is always retried.
wait_plan: A list of waiting delays between retries in seconds. The
maximum number of retries is len(wait_plan).
"""
retry_on = retry_on or (lambda x: False)
wait_plan = list(wait_plan or [])
wait_plan.reverse()
while True:
got_exception = False
try:
result = cb()
except NoRetryException as e:
raise e
except Exception as e:
got_exception = e
if got_exception or retry_on(result):
if not wait_plan: # pragma: no cover
raise Exception("Retried too often. Giving up. Reason: %s" %
str(got_exception))
wait_time = wait_plan.pop()
print("Waiting for %f seconds." % wait_time)
self._side_effect_handler.Sleep(wait_time)
print("Retrying...")
else:
return result
def ReadLine(self, default=None):
# Don't prompt in forced mode.
if self._options.force_readline_defaults and default is not None:
print("%s (forced)" % default)
return default
else:
return self._side_effect_handler.ReadLine()
def Command(self, name, args, cwd=None):
cmd = lambda: self._side_effect_handler.Command(
name, args, "", True, cwd=cwd or self.default_cwd)
return self.Retry(cmd, None, [5])
def Git(self, args="", prefix="", pipe=True, retry_on=None, cwd=None):
cmd = lambda: self._side_effect_handler.Command(
"git", args, prefix, pipe, cwd=cwd or self.default_cwd)
result = self.Retry(cmd, retry_on, [5, 30])
if result is None:
raise GitFailedException("'git %s' failed." % args)
return result
def Editor(self, args):
if self._options.requires_editor:
return self._side_effect_handler.Command(
os.environ["EDITOR"],
args,
pipe=False,
cwd=self.default_cwd)
def ReadURL(self, url, params=None, retry_on=None, wait_plan=None):
wait_plan = wait_plan or [3, 60, 600]
cmd = lambda: self._side_effect_handler.ReadURL(url, params)
return self.Retry(cmd, retry_on, wait_plan)
def Die(self, msg=""):
if msg != "":
print("Error: %s" % msg)
print("Exiting")
raise Exception(msg)
def DieNoManualMode(self, msg=""):
if not self._options.manual: # pragma: no cover
msg = msg or "Only available in manual mode."
self.Die(msg)
def Confirm(self, msg):
print("%s [Y/n] " % msg, end=' ')
answer = self.ReadLine(default="Y")
return answer == "" or answer == "Y" or answer == "y"
def DeleteBranch(self, name, cwd=None):
for line in self.GitBranch(cwd=cwd).splitlines():
if re.match(r"\*?\s*%s$" % re.escape(name), line):
msg = "Branch %s exists, do you want to delete it?" % name
if self.Confirm(msg):
self.GitDeleteBranch(name, cwd=cwd)
print("Branch %s deleted." % name)
else:
msg = "Can't continue. Please delete branch %s and try again." % name
self.Die(msg)
def InitialEnvironmentChecks(self, cwd):
# Cancel if this is not a git checkout.
if not os.path.exists(os.path.join(cwd, ".git")): # pragma: no cover
self.Die("%s is not a git checkout. If you know what you're doing, try "
"deleting it and rerunning this script." % cwd)
# Cancel if EDITOR is unset or not executable.
if (self._options.requires_editor and (not os.environ.get("EDITOR") or
self.Command(
"which", os.environ["EDITOR"]) is None)): # pragma: no cover
self.Die("Please set your EDITOR environment variable, you'll need it.")
def CommonPrepare(self):
# Check for a clean workdir.
if not self.GitIsWorkdirClean(): # pragma: no cover
self.Die("Workspace is not clean. Please commit or undo your changes.")
# Checkout main in case the script was left on a work branch.
self.GitCheckout('origin/main')
# Fetch unfetched revisions.
self.vc.Fetch()
def PrepareBranch(self):
# Delete the branch that will be created later if it exists already.
self.DeleteBranch(self._config["BRANCHNAME"])
def CommonCleanup(self):
self.GitCheckout('origin/main')
self.GitDeleteBranch(self._config["BRANCHNAME"])
# Clean up all temporary files.
for f in glob.iglob("%s*" % self._config["PERSISTFILE_BASENAME"]):
if os.path.isfile(f):
os.remove(f)
if os.path.isdir(f):
shutil.rmtree(f)
def ReadAndPersistVersion(self, prefix=""):
def ReadAndPersist(var_name, def_name):
match = re.match(r"^#define %s\s+(\d*)" % def_name, line)
if match:
value = match.group(1)
self["%s%s" % (prefix, var_name)] = value
for line in LinesInFile(os.path.join(self.default_cwd, VERSION_FILE)):
for (var_name, def_name) in [("major", "V8_MAJOR_VERSION"),
("minor", "V8_MINOR_VERSION"),
("build", "V8_BUILD_NUMBER"),
("patch", "V8_PATCH_LEVEL")]:
ReadAndPersist(var_name, def_name)
def WaitForLGTM(self):
print ("Please wait for an LGTM, then type \"LGTM<Return>\" to commit "
"your change. (If you need to iterate on the patch or double check "
"that it's sensible, do so in another shell, but remember to not "
"change the headline of the uploaded CL.")
answer = ""
while answer != "LGTM":
print("> ", end=' ')
answer = self.ReadLine(None if self._options.wait_for_lgtm else "LGTM")
if answer != "LGTM":
print("That was not 'LGTM'.")
def WaitForResolvingConflicts(self, patch_file):
print("Applying the patch \"%s\" failed. Either type \"ABORT<Return>\", "
"or resolve the conflicts, stage *all* touched files with "
"'git add', and type \"RESOLVED<Return>\"" % (patch_file))
self.DieNoManualMode()
answer = ""
while answer != "RESOLVED":
if answer == "ABORT":
self.Die("Applying the patch failed.")
if answer != "":
print("That was not 'RESOLVED' or 'ABORT'.")
print("> ", end=' ')
answer = self.ReadLine()
# Takes a file containing the patch to apply as first argument.
def ApplyPatch(self, patch_file, revert=False):
try:
self.GitApplyPatch(patch_file, revert)
except GitFailedException:
self.WaitForResolvingConflicts(patch_file)
def GetVersionTag(self, revision):
tags = self.Git(f"tag --points-at {revision}").strip().split('\n')
for tag in tags:
sanitized_tag = SanitizeVersionTag(tag)
if sanitized_tag:
return sanitized_tag
return None
def GetLatestVersion(self):
# Use cached version if available.
if self["latest_version"]:
return self["latest_version"]
# Make sure tags are fetched.
self.Git("fetch origin +refs/tags/*:refs/tags/*")
all_tags = self.vc.GetTags()
only_version_tags = NormalizeVersionTags(all_tags)
def patched_dev_version(tag):
"""True if this tag represents a patched dev or mini branch."""
parts = tag.split('.')
return len(parts) >= 3 and int(parts[2]) > 999
filtered_version_tags = [
tag for tag in only_version_tags if not patched_dev_version(tag)]
version = sorted(filtered_version_tags,
key=LooseVersion, reverse=True)[0]
self["latest_version"] = version
return version
def GetLatestRelease(self):
"""The latest release is the git hash of the latest tagged version.
This revision should be rolled into chromium.
"""
latest_version = self.GetLatestVersion()
# The latest release.
latest_hash = self.GitLog(n=1, format="%H", branch=latest_version)
assert latest_hash
return latest_hash
def GetLatestReleaseBase(self, version=None):
"""The latest release base is the latest revision that is covered in the
last change log file. It doesn't include cherry-picked patches.
"""
latest_version = version or self.GetLatestVersion()
# Strip patch level if it exists.
latest_version = ".".join(latest_version.split(".")[:3])
# The latest release base.
latest_hash = self.GitLog(n=1, format="%H", branch=latest_version)
assert latest_hash
title = self.GitLog(n=1, format="%s", git_hash=latest_hash)
match = PUSH_MSG_GIT_RE.match(title)
if match:
# Legacy: In the old process there's one level of indirection. The
# version is on the candidates branch and points to the real release
# base on main through the commit message.
return match.group("git_rev")
match = PUSH_MSG_NEW_RE.match(title)
if match:
# This is a new-style v8 version branched from main. The commit
# "latest_hash" is the version-file change. Its parent is the release
# base on main.
return self.GitLog(n=1, format="%H", git_hash="%s^" % latest_hash)
self.Die("Unknown latest release: %s" % latest_hash)
def ArrayToVersion(self, prefix):
return ".".join([self[prefix + "major"],
self[prefix + "minor"],
self[prefix + "build"],
self[prefix + "patch"]])
def StoreVersion(self, version, prefix):
version_parts = version.split(".")
if len(version_parts) == 3:
version_parts.append("0")
major, minor, build, patch = version_parts
self[prefix + "major"] = major
self[prefix + "minor"] = minor
self[prefix + "build"] = build
self[prefix + "patch"] = patch
def SetVersion(self, version_file, prefix):
output = ""
for line in FileToText(version_file).splitlines():
if line.startswith("#define V8_MAJOR_VERSION"):
line = re.sub("\d+$", self[prefix + "major"], line)
elif line.startswith("#define V8_MINOR_VERSION"):
line = re.sub("\d+$", self[prefix + "minor"], line)
elif line.startswith("#define V8_BUILD_NUMBER"):
line = re.sub("\d+$", self[prefix + "build"], line)
elif line.startswith("#define V8_PATCH_LEVEL"):
line = re.sub("\d+$", self[prefix + "patch"], line)
elif (self[prefix + "candidate"] and
line.startswith("#define V8_IS_CANDIDATE_VERSION")):
line = re.sub("\d+$", self[prefix + "candidate"], line)
output += "%s\n" % line
TextToFile(output, version_file)
class BootstrapStep(Step):
MESSAGE = "Bootstrapping checkout and state."
def RunStep(self):
# Reserve state entry for json output.
self['json_output'] = {}
if os.path.realpath(self.default_cwd) == os.path.realpath(V8_BASE):
self.Die("Can't use v8 checkout with calling script as work checkout.")
# Directory containing the working v8 checkout.
if not os.path.exists(self._options.work_dir):
os.makedirs(self._options.work_dir)
if not os.path.exists(self.default_cwd):
self.Command("fetch", "v8", cwd=self._options.work_dir)
class UploadStep(Step):
MESSAGE = "Upload for code review."
def RunStep(self):
reviewer = None
if self._options.reviewer:
print("Using account %s for review." % self._options.reviewer)
reviewer = self._options.reviewer
tbr_reviewer = None
if self._options.tbr_reviewer:
print("Using account %s for TBR review." % self._options.tbr_reviewer)
tbr_reviewer = self._options.tbr_reviewer
if not reviewer and not tbr_reviewer:
print(
"Please enter the email address of a V8 reviewer for your patch: ",
end=' ')
self.DieNoManualMode("A reviewer must be specified in forced mode.")
reviewer = self.ReadLine()
self.GitUpload(reviewer, self._options.force_upload,
bypass_hooks=self._options.bypass_upload_hooks,
tbr_reviewer=tbr_reviewer)
def MakeStep(step_class=Step, number=0, state=None, config=None,
options=None, side_effect_handler=DEFAULT_SIDE_EFFECT_HANDLER):
# Allow to pass in empty dictionaries.
state = state if state is not None else {}
config = config if config is not None else {}
try:
message = step_class.MESSAGE
except AttributeError:
message = step_class.__name__
return step_class(
message,
number=number,
config=config,
state=state,
options=options,
handler=side_effect_handler)
class ScriptsBase(object):
def __init__(self,
config=None,
side_effect_handler=DEFAULT_SIDE_EFFECT_HANDLER,
state=None):
self._config = config or self._Config()
self._side_effect_handler = side_effect_handler
self._state = state if state is not None else {}
def _Description(self):
return None
def _PrepareOptions(self, parser):
pass
def _ProcessOptions(self, options):
return True
def _Steps(self): # pragma: no cover
raise Exception("Not implemented.")
def _Config(self):
return {}
def MakeOptions(self, args=None):
parser = argparse.ArgumentParser(description=self._Description())
parser.add_argument("-a", "--author", default="",
help="The author email used for code review.")
parser.add_argument("--dry-run", default=False, action="store_true",
help="Perform only read-only actions.")
parser.add_argument("--json-output",
help="File to write results summary to.")
parser.add_argument("-r", "--reviewer", default="",
help="The account name to be used for reviews.")
parser.add_argument("--tbr-reviewer", "--tbr", default="",
help="The account name to be used for TBR reviews.")
parser.add_argument("-s", "--step",
help="Specify the step where to start work. Default: 0.",
default=0, type=int)
parser.add_argument("--work-dir",
help=("Location where to bootstrap a working v8 "
"checkout."))
self._PrepareOptions(parser)
if args is None: # pragma: no cover
options = parser.parse_args()
else:
options = parser.parse_args(args)
# Process common options.
if options.step < 0: # pragma: no cover
print("Bad step number %d" % options.step)
parser.print_help()
return None
# Defaults for options, common to all scripts.
options.manual = getattr(options, "manual", True)
options.force = getattr(options, "force", False)
options.bypass_upload_hooks = False
# Derived options.
options.requires_editor = not options.force
options.wait_for_lgtm = not options.force
options.force_readline_defaults = not options.manual
options.force_upload = not options.manual
# Process script specific options.
if not self._ProcessOptions(options):
parser.print_help()
return None
if not options.work_dir:
options.work_dir = "/tmp/v8-release-scripts-work-dir"
return options
def RunSteps(self, step_classes, args=None):
options = self.MakeOptions(args)
if not options:
return 1
# Ensure temp dir exists for state files.
state_dir = os.path.dirname(self._config["PERSISTFILE_BASENAME"])
if not os.path.exists(state_dir):
os.makedirs(state_dir)
state_file = "%s-state.json" % self._config["PERSISTFILE_BASENAME"]
if options.step == 0 and os.path.exists(state_file):
os.remove(state_file)
steps = []
for (number, step_class) in enumerate([BootstrapStep] + step_classes):
steps.append(MakeStep(step_class, number, self._state, self._config,
options, self._side_effect_handler))
try:
for step in steps[options.step:]:
if step.Run():
return 0
finally:
if options.json_output:
with open(options.json_output, "w") as f:
json.dump(self._state['json_output'], f)
return 0
def Run(self, args=None):
return self.RunSteps(self._Steps(), args)
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