author Alessio Placitelli <>
Wed, 07 Sep 2016 02:39:00 +0200
changeset 314717 66a2fa62d7601aaae4069bc9a2c4ec13854f65e7
parent 314137 6ef033c9dcc34591e036aa2c94fa4afef4890330
child 315151 395617b1ea5570b028e56efdf14513799d852e7f
permissions -rw-r--r--
Bug 1277806 - Add support for the keyed scalars to the scalar registry. r=gfritzsche MozReview-Commit-ID: 8dKj92Kh2Ev

# 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

from __future__ import print_function, unicode_literals

import errno
import json
import os
import platform
import random
import subprocess
import sys
import uuid
import __builtin__

from types import ModuleType

mach and the build system store shared state in a common directory on the
filesystem. The following directory will be created:


If you would like to use a different directory, hit CTRL+c and set the
MOZBUILD_STATE_PATH environment variable to the directory you would like to
use and re-run mach. For this change to take effect forever, you'll likely
want to export this environment variable from your shell's init scripts.

Press ENTER/RETURN to continue or CTRL+c to abort.

# TODO Bug 794506 Integrate with the in-tree virtualenv configuration.

# Individual files providing mach commands.

    'build': {
        'short': 'Build Commands',
        'long': 'Interact with the build system',
        'priority': 80,
    'post-build': {
        'short': 'Post-build Commands',
        'long': 'Common actions performed after completing a build.',
        'priority': 70,
    'testing': {
        'short': 'Testing',
        'long': 'Run tests.',
        'priority': 60,
    'ci': {
        'short': 'CI',
        'long': 'Taskcluster commands',
        'priority': 59
    'devenv': {
        'short': 'Development Environment',
        'long': 'Set up and configure your development environment.',
        'priority': 50,
    'build-dev': {
        'short': 'Low-level Build System Interaction',
        'long': 'Interact with specific parts of the build system.',
        'priority': 20,
    'misc': {
        'short': 'Potpourri',
        'long': 'Potent potables and assorted snacks.',
        'priority': 10,
    'disabled': {
        'short': 'Disabled',
        'long': 'The disabled commands are hidden by default. Use -v to display them. These commands are unavailable for your current context, run "mach <command>" to see why.',
        'priority': 0,

# We submit data to telemetry approximately every this many mach invocations

def bootstrap(topsrcdir, mozilla_dir=None):
    if mozilla_dir is None:
        mozilla_dir = topsrcdir

    # Ensure we are running Python 2.7+. We put this check here so we generate a
    # user-friendly error message rather than a cryptic stack trace on module
    # import.
    if sys.version_info[0] != 2 or sys.version_info[1] < 7:
        print('Python 2.7 or above (but not Python 3) is required to run mach.')
        print('You are running Python', platform.python_version())

    # Global build system and mach state is stored in a central directory. By
    # default, this is ~/.mozbuild. However, it can be defined via an
    # environment variable. We detect first run (by lack of this directory
    # existing) and notify the user that it will be created. The logic for
    # creation is much simpler for the "advanced" environment variable use
    # case. For default behavior, we educate users and give them an opportunity
    # to react. We always exit after creating the directory because users don't
    # like surprises.
    sys.path[0:0] = [os.path.join(mozilla_dir, path) for path in SEARCH_PATHS]
    import mach.main
    from mozboot.util import get_state_dir

    def telemetry_handler(context, data):
        # We have not opted-in to telemetry
        if 'BUILD_SYSTEM_TELEMETRY' not in os.environ:

        telemetry_dir = os.path.join(get_state_dir()[0], 'telemetry')
        except OSError as e:
            if e.errno != errno.EEXIST:
        outgoing_dir = os.path.join(telemetry_dir, 'outgoing')
        except OSError as e:
            if e.errno != errno.EEXIST:

        # Add common metadata to help submit sorted data later on.
        data['argv'] = sys.argv
        data.setdefault('system', {}).update(dict(

        if platform.system() == 'Linux':
            dist = list(platform.linux_distribution())
            data['system']['linux_distribution'] = dist
        elif platform.system() == 'Windows':
            data['system']['win32_ver'] = win32_ver
        elif platform.system() == 'Darwin':
            # mac version is a special Cupertino snowflake
            r, v, m = platform.mac_ver()
            data['system']['mac_ver'] = [r, list(v), m]

        with open(os.path.join(outgoing_dir, str(uuid.uuid4()) + '.json'),
                  'w') as f:
            json.dump(data, f, sort_keys=True)

    def should_skip_dispatch(context, handler):
        # The user is performing a maintenance command.
        if in ('bootstrap', 'doctor', 'mach-commands', 'mercurial-setup'):
            return True

        # We are running in automation.
        if 'MOZ_AUTOMATION' in os.environ or 'TASK_ID' in os.environ:
            return True

        # The environment is likely a machine invocation.
        if sys.stdin.closed or not sys.stdin.isatty():
            return True

        return False

    def post_dispatch_handler(context, handler, args):
        """Perform global operations after command dispatch.

        For now,  we will use this to handle build system telemetry.
        # Don't do anything when...
        if should_skip_dispatch(context, handler):

        # We call mach environment in which would cause the
        # data submission below to block the forward progress of make.
        if in ('environment'):

        # We have not opted-in to telemetry
        if 'BUILD_SYSTEM_TELEMETRY' not in os.environ:

        # Every n-th operation
        if random.randint(1, TELEMETRY_SUBMISSION_FREQUENCY) != 1:

        with open(os.devnull, 'wb') as devnull:
                              os.path.join(topsrcdir, 'build',
                              stdout=devnull, stderr=devnull)

    def populate_context(context, key=None):
        if key is None:
        if key == 'state_dir':
            state_dir, is_environ = get_state_dir()
            if is_environ:
                if not os.path.exists(state_dir):
                    print('Creating global state directory from environment variable: %s'
                          % state_dir)
                    os.makedirs(state_dir, mode=0o770)
                if not os.path.exists(state_dir):
                    except KeyboardInterrupt:

                    print('\nCreating default state directory: %s' % state_dir)
                    os.makedirs(state_dir, mode=0o770)

            return state_dir

        if key == 'topdir':
            return topsrcdir

        if key == 'telemetry_handler':
            return telemetry_handler

        if key == 'post_dispatch_handler':
            return post_dispatch_handler

        raise AttributeError(key)

    mach = mach.main.Mach(os.getcwd())
    mach.populate_context_handler = populate_context

    if not mach.settings_paths:
        # default global machrc location
    # always load local repository configuration

    for category, meta in CATEGORIES.items():
        mach.define_category(category, meta['short'], meta['long'],

    for path in MACH_MODULES:
        mach.load_commands_from_file(os.path.join(mozilla_dir, path))

    return mach

# Hook import such that .pyc/.pyo files without a corresponding .py file in
# the source directory are essentially ignored. See further below for details
# and caveats.
# Objdirs outside the source directory are ignored because in most cases, if
# a .pyc/.pyo file exists there, a .py file will be next to it anyways.
class ImportHook(object):
    def __init__(self, original_import):
        self._original_import = original_import
        # Assume the source directory is the parent directory of the one
        # containing this file.
        self._source_dir = os.path.normcase(os.path.abspath(
            os.path.dirname(os.path.dirname(__file__)))) + os.sep
        self._modules = set()

    def __call__(self, name, globals=None, locals=None, fromlist=None,
        # name might be a relative import. Instead of figuring out what that
        # resolves to, which is complex, just rely on the real import.
        # Since we don't know the full module name, we can't check sys.modules,
        # so we need to keep track of which modules we've already seen to avoid
        # to stat() them again when they are imported multiple times.
        module = self._original_import(name, globals, locals, fromlist, level)

        # Some tests replace modules in sys.modules with non-module instances.
        if not isinstance(module, ModuleType):
            return module

        resolved_name = module.__name__
        if resolved_name in self._modules:
            return module

        # Builtin modules don't have a __file__ attribute.
        if not hasattr(module, '__file__'):
            return module

        # Note: module.__file__ is not always absolute.
        path = os.path.normcase(os.path.abspath(module.__file__))
        # Note: we could avoid normcase and abspath above for non pyc/pyo
        # files, but those are actually rare, so it doesn't really matter.
        if not path.endswith(('.pyc', '.pyo')):
            return module

        # Ignore modules outside our source directory
        if not path.startswith(self._source_dir):
            return module

        # If there is no .py corresponding to the .pyc/.pyo module we're
        # loading, remove the .pyc/.pyo file, and reload the module.
        # Since we already loaded the .pyc/.pyo module, if it had side
        # effects, they will have happened already, and loading the module
        # with the same name, from another directory may have the same side
        # effects (or different ones). We assume it's not a problem for the
        # python modules under our source directory (either because it
        # doesn't happen or because it doesn't matter).
        if not os.path.exists(module.__file__[:-1]):
            del sys.modules[module.__name__]
            module = self(name, globals, locals, fromlist, level)

        return module

# Install our hook
__builtin__.__import__ = ImportHook(__builtin__.__import__)