servo/python/servo/command_base.py
2018-07-31 22:39:45 +08:00

714 lines
29 KiB
Python

# Copyright 2013 The Servo Project Developers. See the COPYRIGHT
# file at the top-level directory of this distribution.
#
# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
# option. This file may not be copied, modified, or distributed
# except according to those terms.
from errno import ENOENT as NO_SUCH_FILE_OR_DIRECTORY
from glob import glob
import gzip
import itertools
import locale
import os
from os import path
import platform
import re
import contextlib
import subprocess
from subprocess import PIPE
import sys
import tarfile
from xml.etree.ElementTree import XML
from servo.util import download_file
import urllib2
from mach.registrar import Registrar
import toml
from servo.packages import WINDOWS_MSVC as msvc_deps
from servo.util import host_triple
BIN_SUFFIX = ".exe" if sys.platform == "win32" else ""
NIGHTLY_REPOSITORY_URL = "https://servo-builds.s3.amazonaws.com/"
@contextlib.contextmanager
def cd(new_path):
"""Context manager for changing the current working directory"""
previous_path = os.getcwd()
try:
os.chdir(new_path)
yield
finally:
os.chdir(previous_path)
@contextlib.contextmanager
def setlocale(name):
"""Context manager for changing the current locale"""
saved_locale = locale.setlocale(locale.LC_ALL)
try:
yield locale.setlocale(locale.LC_ALL, name)
finally:
locale.setlocale(locale.LC_ALL, saved_locale)
def find_dep_path_newest(package, bin_path):
deps_path = path.join(path.split(bin_path)[0], "build")
candidates = []
with cd(deps_path):
for c in glob(package + '-*'):
candidate_path = path.join(deps_path, c)
if path.exists(path.join(candidate_path, "output")):
candidates.append(candidate_path)
if candidates:
return max(candidates, key=lambda c: path.getmtime(path.join(c, "output")))
return None
def archive_deterministically(dir_to_archive, dest_archive, prepend_path=None):
"""Create a .tar.gz archive in a deterministic (reproducible) manner.
See https://reproducible-builds.org/docs/archives/ for more details."""
def reset(tarinfo):
"""Helper to reset owner/group and modification time for tar entries"""
tarinfo.uid = tarinfo.gid = 0
tarinfo.uname = tarinfo.gname = "root"
tarinfo.mtime = 0
return tarinfo
dest_archive = os.path.abspath(dest_archive)
with cd(dir_to_archive):
current_dir = "."
file_list = [current_dir]
for root, dirs, files in os.walk(current_dir):
for name in itertools.chain(dirs, files):
file_list.append(os.path.join(root, name))
# Sort file entries with the fixed locale
with setlocale('C'):
file_list.sort(cmp=locale.strcoll)
# Use a temporary file and atomic rename to avoid partially-formed
# packaging (in case of exceptional situations like running out of disk space).
# TODO do this in a temporary folder after #11983 is fixed
temp_file = '{}.temp~'.format(dest_archive)
with os.fdopen(os.open(temp_file, os.O_WRONLY | os.O_CREAT, 0644), 'w') as out_file:
with gzip.GzipFile('wb', fileobj=out_file, mtime=0) as gzip_file:
with tarfile.open(fileobj=gzip_file, mode='w:') as tar_file:
for entry in file_list:
arcname = entry
if prepend_path is not None:
arcname = os.path.normpath(os.path.join(prepend_path, arcname))
tar_file.add(entry, filter=reset, recursive=False, arcname=arcname)
os.rename(temp_file, dest_archive)
def normalize_env(env):
# There is a bug in subprocess where it doesn't like unicode types in
# environment variables. Here, ensure all unicode are converted to
# binary. utf-8 is our globally assumed default. If the caller doesn't
# want UTF-8, they shouldn't pass in a unicode instance.
normalized_env = {}
for k, v in env.items():
if isinstance(k, unicode):
k = k.encode('utf-8', 'strict')
if isinstance(v, unicode):
v = v.encode('utf-8', 'strict')
normalized_env[k] = v
return normalized_env
def call(*args, **kwargs):
"""Wrap `subprocess.call`, printing the command if verbose=True."""
verbose = kwargs.pop('verbose', False)
if verbose:
print(' '.join(args[0]))
if 'env' in kwargs:
kwargs['env'] = normalize_env(kwargs['env'])
# we have to use shell=True in order to get PATH handling
# when looking for the binary on Windows
return subprocess.call(*args, shell=sys.platform == 'win32', **kwargs)
def check_output(*args, **kwargs):
"""Wrap `subprocess.call`, printing the command if verbose=True."""
verbose = kwargs.pop('verbose', False)
if verbose:
print(' '.join(args[0]))
if 'env' in kwargs:
kwargs['env'] = normalize_env(kwargs['env'])
# we have to use shell=True in order to get PATH handling
# when looking for the binary on Windows
return subprocess.check_output(*args, shell=sys.platform == 'win32', **kwargs)
def check_call(*args, **kwargs):
"""Wrap `subprocess.check_call`, printing the command if verbose=True.
Also fix any unicode-containing `env`, for subprocess """
verbose = kwargs.pop('verbose', False)
if 'env' in kwargs:
kwargs['env'] = normalize_env(kwargs['env'])
if verbose:
print(' '.join(args[0]))
# we have to use shell=True in order to get PATH handling
# when looking for the binary on Windows
proc = subprocess.Popen(*args, shell=sys.platform == 'win32', **kwargs)
status = None
# Leave it to the subprocess to handle Ctrl+C. If it terminates as
# a result of Ctrl+C, proc.wait() will return a status code, and,
# we get out of the loop. If it doesn't, like e.g. gdb, we continue
# waiting.
while status is None:
try:
status = proc.wait()
except KeyboardInterrupt:
pass
if status:
raise subprocess.CalledProcessError(status, ' '.join(*args))
def is_windows():
return sys.platform == 'win32'
def is_macosx():
return sys.platform == 'darwin'
def is_linux():
return sys.platform.startswith('linux')
def set_osmesa_env(bin_path, env):
"""Set proper LD_LIBRARY_PATH and DRIVE for software rendering on Linux and OSX"""
if is_linux():
dep_path = find_dep_path_newest('osmesa-src', bin_path)
if not dep_path:
return None
osmesa_path = path.join(dep_path, "out", "lib", "gallium")
env["LD_LIBRARY_PATH"] = osmesa_path
env["GALLIUM_DRIVER"] = "softpipe"
elif is_macosx():
osmesa_dep_path = find_dep_path_newest('osmesa-src', bin_path)
if not osmesa_dep_path:
return None
osmesa_path = path.join(osmesa_dep_path,
"out", "src", "gallium", "targets", "osmesa", ".libs")
glapi_path = path.join(osmesa_dep_path,
"out", "src", "mapi", "shared-glapi", ".libs")
env["DYLD_LIBRARY_PATH"] = osmesa_path + ":" + glapi_path
env["GALLIUM_DRIVER"] = "softpipe"
return env
class BuildNotFound(Exception):
def __init__(self, message):
self.message = message
def __str__(self):
return self.message
class CommandBase(object):
"""Base class for mach command providers.
This mostly handles configuration management, such as .servobuild."""
def __init__(self, context):
self.context = context
def get_env_bool(var, default):
# Contents of env vars are strings by default. This returns the
# boolean value of the specified environment variable, or the
# speciried default if the var doesn't contain True or False
return {'True': True, 'False': False}.get(os.environ.get(var), default)
def resolverelative(category, key):
# Allow ~
self.config[category][key] = path.expanduser(self.config[category][key])
# Resolve relative paths
self.config[category][key] = path.join(context.topdir,
self.config[category][key])
if not hasattr(self.context, "bootstrapped"):
self.context.bootstrapped = False
config_path = path.join(context.topdir, ".servobuild")
if path.exists(config_path):
with open(config_path) as f:
self.config = toml.loads(f.read())
else:
self.config = {}
# Handle missing/default items
self.config.setdefault("tools", {})
default_cache_dir = os.environ.get("SERVO_CACHE_DIR",
path.join(context.topdir, ".servo"))
self.config["tools"].setdefault("cache-dir", default_cache_dir)
resolverelative("tools", "cache-dir")
default_cargo_home = os.environ.get("CARGO_HOME",
path.join(context.topdir, ".cargo"))
self.config["tools"].setdefault("cargo-home-dir", default_cargo_home)
resolverelative("tools", "cargo-home-dir")
context.sharedir = self.config["tools"]["cache-dir"]
self.config["tools"].setdefault("use-rustup", True)
self.config["tools"].setdefault("rustc-with-gold", get_env_bool("SERVO_RUSTC_WITH_GOLD", True))
self.config.setdefault("build", {})
self.config["build"].setdefault("android", False)
self.config["build"].setdefault("mode", "")
self.config["build"].setdefault("debug-mozjs", False)
self.config["build"].setdefault("ccache", "")
self.config["build"].setdefault("rustflags", "")
self.config["build"].setdefault("incremental", None)
self.config["build"].setdefault("thinlto", False)
self.config.setdefault("android", {})
self.config["android"].setdefault("sdk", "")
self.config["android"].setdefault("ndk", "")
self.config["android"].setdefault("toolchain", "")
# Set default android target
self.handle_android_target("armv7-linux-androideabi")
_default_toolchain = None
def toolchain(self):
return self.default_toolchain()
def default_toolchain(self):
if self._default_toolchain is None:
filename = path.join(self.context.topdir, "rust-toolchain")
with open(filename) as f:
self._default_toolchain = f.read().strip()
return self._default_toolchain
def call_rustup_run(self, args, **kwargs):
if self.config["tools"]["use-rustup"]:
try:
version_line = subprocess.check_output(["rustup" + BIN_SUFFIX, "--version"])
except OSError as e:
if e.errno == NO_SUCH_FILE_OR_DIRECTORY:
print "It looks like rustup is not installed. See instructions at " \
"https://github.com/servo/servo/#setting-up-your-environment"
print
return 1
raise
version = tuple(map(int, re.match("rustup (\d+)\.(\d+)\.(\d+)", version_line).groups()))
if version < (1, 8, 0):
print "rustup is at version %s.%s.%s, Servo requires 1.8.0 or more recent." % version
print "Try running 'rustup self update'."
return 1
toolchain = self.toolchain()
if platform.system() == "Windows":
toolchain += "-x86_64-pc-windows-msvc"
args = ["rustup" + BIN_SUFFIX, "run", "--install", toolchain] + args
else:
args[0] += BIN_SUFFIX
return call(args, **kwargs)
def get_top_dir(self):
return self.context.topdir
def get_target_dir(self):
if "CARGO_TARGET_DIR" in os.environ:
return os.environ["CARGO_TARGET_DIR"]
else:
return path.join(self.context.topdir, "target")
def get_apk_path(self, release):
base_path = self.get_target_dir()
base_path = path.join(base_path, self.config["android"]["target"])
apk_name = "servoapp.apk"
build_type = "release" if release else "debug"
return path.join(base_path, build_type, apk_name)
def get_binary_path(self, release, dev, android=False):
# TODO(autrilla): this function could still use work - it shouldn't
# handle quitting, or printing. It should return the path, or an error.
base_path = self.get_target_dir()
binary_name = "servo" + BIN_SUFFIX
if android:
base_path = path.join(base_path, self.config["android"]["target"])
binary_name = "libsimpleservo.so"
release_path = path.join(base_path, "release", binary_name)
dev_path = path.join(base_path, "debug", binary_name)
# Prefer release if both given
if release and dev:
dev = False
release_exists = path.exists(release_path)
dev_exists = path.exists(dev_path)
if not release_exists and not dev_exists:
raise BuildNotFound('No Servo binary found.'
' Perhaps you forgot to run `./mach build`?')
if release and release_exists:
return release_path
if dev and dev_exists:
return dev_path
if not dev and not release and release_exists and dev_exists:
print("You have multiple profiles built. Please specify which "
"one to run with '--release' or '--dev'.")
sys.exit()
if not dev and not release:
if release_exists:
return release_path
else:
return dev_path
print("The %s profile is not built. Please run './mach build%s' "
"and try again." % ("release" if release else "dev",
" --release" if release else ""))
sys.exit()
def get_nightly_binary_path(self, nightly_date):
if nightly_date is None:
return
if not nightly_date:
print(
"No nightly date has been provided although the --nightly or -n flag has been passed.")
sys.exit(1)
# Will alow us to fetch the relevant builds from the nightly repository
os_prefix = "linux"
if is_windows():
os_prefix = "windows-msvc"
if is_macosx():
print("The nightly flag is not supported on mac yet.")
sys.exit(1)
nightly_date = nightly_date.strip()
# Fetch the filename to download from the build list
repository_index = NIGHTLY_REPOSITORY_URL + "?list-type=2&prefix=nightly"
req = urllib2.Request(
"{}/{}/{}".format(repository_index, os_prefix, nightly_date))
try:
response = urllib2.urlopen(req).read()
tree = XML(response)
namespaces = {'ns': tree.tag[1:tree.tag.index('}')]}
file_to_download = tree.find('ns:Contents', namespaces).find(
'ns:Key', namespaces).text
except urllib2.URLError as e:
print("Could not fetch the available nightly versions from the repository : {}".format(
e.reason))
sys.exit(1)
except AttributeError as e:
print("Could not fetch a nightly version for date {} and platform {}".format(
nightly_date, os_prefix))
sys.exit(1)
nightly_target_directory = path.join(self.context.topdir, "target")
# ':' is not an authorized character for a file name on Windows
# make sure the OS specific separator is used
target_file_path = file_to_download.replace(':', '-').split('/')
destination_file = os.path.join(
nightly_target_directory, os.path.join(*target_file_path))
# Once extracted, the nightly folder name is the tar name without the extension
# (eg /foo/bar/baz.tar.gz extracts to /foo/bar/baz)
destination_folder = os.path.splitext(destination_file)[0]
nightlies_folder = path.join(
nightly_target_directory, 'nightly', os_prefix)
# Make sure the target directory exists
if not os.path.isdir(nightlies_folder):
print("The nightly folder for the target does not exist yet. Creating {}".format(
nightlies_folder))
os.makedirs(nightlies_folder)
# Download the nightly version
if os.path.isfile(path.join(nightlies_folder, destination_file)):
print("The nightly file {} has already been downloaded.".format(
destination_file))
else:
print("The nightly {} does not exist yet, downloading it.".format(
destination_file))
download_file(destination_file, NIGHTLY_REPOSITORY_URL +
file_to_download, destination_file)
# Extract the downloaded nightly version
if os.path.isdir(destination_folder):
print("The nightly file {} has already been extracted.".format(
destination_folder))
else:
print("Extracting to {} ...".format(destination_folder))
if is_windows():
command = 'msiexec /a {} /qn TARGETDIR={}'.format(
os.path.join(nightlies_folder, destination_file), destination_folder)
if subprocess.call(command, stdout=PIPE, stderr=PIPE) != 0:
print("Could not extract the nightly executable from the msi package.")
sys.exit(1)
else:
with tarfile.open(os.path.join(nightlies_folder, destination_file), "r") as tar:
tar.extractall(destination_folder)
bin_folder = path.join(destination_folder, "servo")
if is_windows():
bin_folder = path.join(destination_folder, "PFiles", "Mozilla research", "Servo Tech Demo")
return path.join(bin_folder, "servo{}".format(BIN_SUFFIX))
def build_env(self, hosts_file_path=None, target=None, is_build=False, test_unit=False):
"""Return an extended environment dictionary."""
env = os.environ.copy()
if sys.platform == "win32" and type(env['PATH']) == unicode:
# On win32, the virtualenv's activate_this.py script sometimes ends up
# turning os.environ['PATH'] into a unicode string. This doesn't work
# for passing env vars in to a process, so we force it back to ascii.
# We don't use UTF8 since that won't be correct anyway; if you actually
# have unicode stuff in your path, all this PATH munging would have broken
# it in any case.
env['PATH'] = env['PATH'].encode('ascii', 'ignore')
extra_path = []
extra_lib = []
if "msvc" in (target or host_triple()):
msvc_x64 = "64" if "x86_64" in (target or host_triple()) else ""
msvc_deps_dir = path.join(self.context.sharedir, "msvc-dependencies")
def package_dir(package):
return path.join(msvc_deps_dir, package, msvc_deps[package])
extra_path += [path.join(package_dir("cmake"), "bin")]
extra_path += [path.join(package_dir("llvm"), "bin")]
extra_path += [path.join(package_dir("ninja"), "bin")]
# Link openssl
env["OPENSSL_INCLUDE_DIR"] = path.join(package_dir("openssl"), "include")
env["OPENSSL_LIB_DIR"] = path.join(package_dir("openssl"), "lib" + msvc_x64)
env["OPENSSL_LIBS"] = "libsslMD:libcryptoMD"
# Link moztools
env["MOZTOOLS_PATH"] = path.join(package_dir("moztools"), "bin")
# Link LLVM
env["LIBCLANG_PATH"] = path.join(package_dir("llvm"), "lib")
if is_windows():
if not os.environ.get("NATIVE_WIN32_PYTHON"):
env["NATIVE_WIN32_PYTHON"] = sys.executable
# Always build harfbuzz from source
env["HARFBUZZ_SYS_NO_PKG_CONFIG"] = "true"
if extra_path:
env["PATH"] = "%s%s%s" % (os.pathsep.join(extra_path), os.pathsep, env["PATH"])
if self.config["build"]["incremental"]:
env["CARGO_INCREMENTAL"] = "1"
elif self.config["build"]["incremental"] is not None:
env["CARGO_INCREMENTAL"] = "0"
if extra_lib:
if sys.platform == "darwin":
env["DYLD_LIBRARY_PATH"] = "%s%s%s" % \
(os.pathsep.join(extra_lib),
os.pathsep,
env.get("DYLD_LIBRARY_PATH", ""))
else:
env["LD_LIBRARY_PATH"] = "%s%s%s" % \
(os.pathsep.join(extra_lib),
os.pathsep,
env.get("LD_LIBRARY_PATH", ""))
# Paths to Android build tools:
if self.config["android"]["sdk"]:
env["ANDROID_SDK"] = self.config["android"]["sdk"]
if self.config["android"]["ndk"]:
env["ANDROID_NDK"] = self.config["android"]["ndk"]
if self.config["android"]["toolchain"]:
env["ANDROID_TOOLCHAIN"] = self.config["android"]["toolchain"]
if self.config["android"]["platform"]:
env["ANDROID_PLATFORM"] = self.config["android"]["platform"]
toolchains = path.join(self.context.topdir, "android-toolchains")
for kind in ["sdk", "ndk"]:
default = os.path.join(toolchains, kind)
if os.path.isdir(default):
env.setdefault("ANDROID_" + kind.upper(), default)
tools = os.path.join(toolchains, "sdk", "platform-tools")
if os.path.isdir(tools):
env["PATH"] = "%s%s%s" % (tools, os.pathsep, env["PATH"])
# These are set because they are the variable names that build-apk
# expects. However, other submodules have makefiles that reference
# the env var names above. Once glutin is enabled and set as the
# default, we could modify the subproject makefiles to use the names
# below and remove the vars above, to avoid duplication.
if "ANDROID_SDK" in env:
env["ANDROID_HOME"] = env["ANDROID_SDK"]
if "ANDROID_NDK" in env:
env["NDK_HOME"] = env["ANDROID_NDK"]
if "ANDROID_TOOLCHAIN" in env:
env["NDK_STANDALONE"] = env["ANDROID_TOOLCHAIN"]
if hosts_file_path:
env['HOST_FILE'] = hosts_file_path
if not test_unit:
# This wrapper script is in bash and doesn't work on Windows
# where we want to run doctests as part of `./mach test-unit`
env['RUSTDOC'] = path.join(self.context.topdir, 'etc', 'rustdoc-with-private')
if self.config["build"]["rustflags"]:
env['RUSTFLAGS'] = env.get('RUSTFLAGS', "") + " " + self.config["build"]["rustflags"]
# Don't run the gold linker if on Windows https://github.com/servo/servo/issues/9499
if self.config["tools"]["rustc-with-gold"] and sys.platform != "win32":
if subprocess.call(['which', 'ld.gold'], stdout=PIPE, stderr=PIPE) == 0:
env['RUSTFLAGS'] = env.get('RUSTFLAGS', "") + " -C link-args=-fuse-ld=gold"
if not (self.config["build"]["ccache"] == ""):
env['CCACHE'] = self.config["build"]["ccache"]
# Ensure Rust uses hard floats and SIMD on ARM devices
if target:
if target.startswith('arm') or target.startswith('aarch64'):
env['RUSTFLAGS'] = env.get('RUSTFLAGS', "") + " -C target-feature=+neon"
env['RUSTFLAGS'] = env.get('RUSTFLAGS', "") + " -W unused-extern-crates"
git_info = []
if os.path.isdir('.git') and is_build:
git_sha = subprocess.check_output([
'git', 'rev-parse', '--short', 'HEAD'
]).strip()
git_is_dirty = bool(subprocess.check_output([
'git', 'status', '--porcelain'
]).strip())
git_info.append('')
git_info.append(git_sha)
if git_is_dirty:
git_info.append('dirty')
env['GIT_INFO'] = '-'.join(git_info)
if self.config["build"]["thinlto"]:
env['RUSTFLAGS'] += " -Z thinlto"
return env
def ports_servo_crate(self):
return path.join(self.context.topdir, "ports", "servo")
def ports_servo_manifest(self):
return path.join(self.context.topdir, "ports", "servo", "Cargo.toml")
def servo_features(self):
"""Return a list of optional features to enable for the Servo crate"""
features = []
if self.config["build"]["debug-mozjs"]:
features += ["debugmozjs"]
return features
def android_support_dir(self):
return path.join(self.context.topdir, "support", "android")
def android_build_dir(self, dev):
return path.join(self.get_target_dir(), self.config["android"]["target"], "debug" if dev else "release")
def android_aar_dir(self):
return path.join(self.context.topdir, "target", "android_aar")
def android_adb_path(self, env):
if "ANDROID_SDK" in env:
sdk_adb = path.join(env["ANDROID_SDK"], "platform-tools", "adb")
if path.exists(sdk_adb):
return sdk_adb
return "adb"
def android_emulator_path(self, env):
if "ANDROID_SDK" in env:
sdk_adb = path.join(env["ANDROID_SDK"], "emulator", "emulator")
if path.exists(sdk_adb):
return sdk_adb
return "emulator"
def handle_android_target(self, target):
if target == "arm-linux-androideabi":
self.config["android"]["platform"] = "android-18"
self.config["android"]["target"] = target
self.config["android"]["toolchain_prefix"] = target
self.config["android"]["arch"] = "arm"
self.config["android"]["lib"] = "armeabi"
self.config["android"]["toolchain_name"] = target + "-4.9"
return True
elif target == "armv7-linux-androideabi":
self.config["android"]["platform"] = "android-18"
self.config["android"]["target"] = target
self.config["android"]["toolchain_prefix"] = "arm-linux-androideabi"
self.config["android"]["arch"] = "arm"
self.config["android"]["lib"] = "armeabi-v7a"
self.config["android"]["toolchain_name"] = "arm-linux-androideabi-4.9"
return True
elif target == "aarch64-linux-android":
self.config["android"]["platform"] = "android-21"
self.config["android"]["target"] = target
self.config["android"]["toolchain_prefix"] = target
self.config["android"]["arch"] = "arm64"
self.config["android"]["lib"] = "arm64-v8a"
self.config["android"]["toolchain_name"] = target + "-4.9"
return True
elif target == "i686-linux-android":
self.config["android"]["platform"] = "android-18"
self.config["android"]["target"] = target
self.config["android"]["toolchain_prefix"] = "x86"
self.config["android"]["arch"] = "x86"
self.config["android"]["lib"] = "x86"
self.config["android"]["toolchain_name"] = "x86-4.9"
return True
return False
def ensure_bootstrapped(self, target=None):
if self.context.bootstrapped:
return
target_platform = target or host_triple()
# Always check if all needed MSVC dependencies are installed
if "msvc" in target_platform:
Registrar.dispatch("bootstrap", context=self.context)
self.context.bootstrapped = True
def ensure_clobbered(self, target_dir=None):
if target_dir is None:
target_dir = self.get_target_dir()
auto = True if os.environ.get('AUTOCLOBBER', False) else False
src_clobber = os.path.join(self.context.topdir, 'CLOBBER')
target_clobber = os.path.join(target_dir, 'CLOBBER')
if not os.path.exists(target_dir):
os.makedirs(target_dir)
if not os.path.exists(target_clobber):
# Simply touch the file.
with open(target_clobber, 'a'):
pass
if auto:
if os.path.getmtime(src_clobber) > os.path.getmtime(target_clobber):
print('Automatically clobbering target directory: {}'.format(target_dir))
try:
Registrar.dispatch("clean", context=self.context, verbose=True)
print('Successfully completed auto clobber.')
except subprocess.CalledProcessError as error:
sys.exit(error)
else:
print("Clobber not needed.")