author Chris H-C <>
Mon, 04 Jul 2016 11:16:05 -0400
changeset 312997 df28918fe2361f0b54ca9ce4773a29c4c0675d06
parent 309149 62f855e872506e80a209d6d3415a1c45922ab72a
child 313690 108fe94daec368f5a04c86633d6b8ffe347837cc
child 313813 d67ee15cd8756594d994c3ab47cbb90acfc403d1
permissions -rw-r--r--
bug 1218576 - Support remote accumulation via JS histograms. r=gfritzsche The JS histograms, too, need to dispatch their accumulations from child to parent. JSHistograms_Add now only supports histograms that are in gHistogramsMap or that were created in the parent process. After bug 1288745, maybe we'll be able to change this to be less convoluted. MozReview-Commit-ID: 3qTH89YKbGP

# 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__)