Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 725 insertions, 0 deletions

diff --git a/build/mach_initialize.py b/build/mach_initialize.py
new file mode 100644
index 0000000000..e280688009
--- /dev/null
+++ b/build/mach_initialize.py
@@ -0,0 +1,725 @@
+# 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 http://mozilla.org/MPL/2.0/.
+
+import math
+import os
+import shutil
+import sys
+from pathlib import Path
+
+if sys.version_info[0] < 3:
+    import __builtin__ as builtins
+
+    class MetaPathFinder(object):
+        pass
+
+
+else:
+    from importlib.abc import MetaPathFinder
+
+from types import ModuleType
+
+STATE_DIR_FIRST_RUN = """
+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, rename or move it to your
+desired location, and set the MOZBUILD_STATE_PATH environment variable
+accordingly.
+""".strip()
+
+
+CATEGORIES = {
+    "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,
+    },
+    "release": {
+        "short": "Release automation",
+        "long": "Commands for used in release automation.",
+        "priority": 5,
+    },
+    "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,
+    },
+}
+
+
+def _activate_python_environment(topsrcdir, get_state_dir):
+    from mach.site import MachSiteManager
+
+    mach_environment = MachSiteManager.from_environment(
+        topsrcdir,
+        get_state_dir,
+    )
+    mach_environment.activate()
+
+
+def _maybe_activate_mozillabuild_environment():
+    if sys.platform != "win32":
+        return
+
+    mozillabuild = Path(os.environ.get("MOZILLABUILD", r"C:\mozilla-build"))
+    os.environ.setdefault("MOZILLABUILD", str(mozillabuild))
+    assert mozillabuild.exists(), (
+        f'MozillaBuild was not found at "{mozillabuild}".\n'
+        "If it's installed in a different location, please "
+        'set the "MOZILLABUILD" environment variable '
+        "accordingly."
+    )
+
+    use_msys2 = (mozillabuild / "msys2").exists()
+    if use_msys2:
+        mozillabuild_msys_tools_path = mozillabuild / "msys2" / "usr" / "bin"
+    else:
+        mozillabuild_msys_tools_path = mozillabuild / "msys" / "bin"
+
+    paths_to_add = [mozillabuild_msys_tools_path, mozillabuild / "bin"]
+    existing_paths = [Path(p) for p in os.environ.get("PATH", "").split(os.pathsep)]
+    for new_path in paths_to_add:
+        if new_path not in existing_paths:
+            os.environ["PATH"] += f"{os.pathsep}{new_path}"
+
+
+def initialize(topsrcdir):
+    # This directory was deleted in bug 1666345, but there may be some ignored
+    # files here. We can safely just delete it for the user so they don't have
+    # to clean the repo themselves.
+    deleted_dir = os.path.join(topsrcdir, "third_party", "python", "psutil")
+    if os.path.exists(deleted_dir):
+        shutil.rmtree(deleted_dir, ignore_errors=True)
+
+    # We need the "mach" module to access the logic to parse virtualenv
+    # requirements. Since that depends on "packaging" (and, transitively,
+    # "pyparsing"), we add those to the path too.
+    sys.path[0:0] = [
+        os.path.join(topsrcdir, module)
+        for module in (
+            os.path.join("python", "mach"),
+            os.path.join("third_party", "python", "packaging"),
+            os.path.join("third_party", "python", "pyparsing"),
+        )
+    ]
+
+    from mach.util import get_state_dir, setenv
+
+    state_dir = _create_state_dir()
+
+    # normpath state_dir to normalize msys-style slashes.
+    _activate_python_environment(
+        topsrcdir, lambda: os.path.normpath(get_state_dir(True, topsrcdir=topsrcdir))
+    )
+    _maybe_activate_mozillabuild_environment()
+
+    import mach.base
+    import mach.main
+    from mach.main import MachCommandReference
+
+    # Centralized registry of available mach commands
+    MACH_COMMANDS = {
+        "valgrind-test": MachCommandReference("build/valgrind/mach_commands.py"),
+        "devtools-css-db": MachCommandReference(
+            "devtools/shared/css/generated/mach_commands.py"
+        ),
+        "webidl-example": MachCommandReference("dom/bindings/mach_commands.py"),
+        "webidl-parser-test": MachCommandReference("dom/bindings/mach_commands.py"),
+        "hazards": MachCommandReference(
+            "js/src/devtools/rootAnalysis/mach_commands.py"
+        ),
+        "reftest": MachCommandReference("layout/tools/reftest/mach_commands.py"),
+        "jstestbrowser": MachCommandReference("layout/tools/reftest/mach_commands.py"),
+        "crashtest": MachCommandReference("layout/tools/reftest/mach_commands.py"),
+        "android": MachCommandReference("mobile/android/mach_commands.py"),
+        "gradle": MachCommandReference("mobile/android/mach_commands.py"),
+        "gradle-install": MachCommandReference("mobile/android/mach_commands.py"),
+        "mach-commands": MachCommandReference(
+            "python/mach/mach/commands/commandinfo.py"
+        ),
+        "mach-debug-commands": MachCommandReference(
+            "python/mach/mach/commands/commandinfo.py"
+        ),
+        "mach-completion": MachCommandReference(
+            "python/mach/mach/commands/commandinfo.py"
+        ),
+        "settings": MachCommandReference("python/mach/mach/commands/settings.py"),
+        "python": MachCommandReference("python/mach_commands.py"),
+        "python-test": MachCommandReference("python/mach_commands.py"),
+        "bootstrap": MachCommandReference("python/mozboot/mozboot/mach_commands.py"),
+        "vcs-setup": MachCommandReference("python/mozboot/mozboot/mach_commands.py"),
+        "artifact": MachCommandReference(
+            "python/mozbuild/mozbuild/artifact_commands.py"
+        ),
+        "ide": MachCommandReference(
+            "python/mozbuild/mozbuild/backend/mach_commands.py"
+        ),
+        "build": MachCommandReference("python/mozbuild/mozbuild/build_commands.py"),
+        "configure": MachCommandReference("python/mozbuild/mozbuild/build_commands.py"),
+        "resource-usage": MachCommandReference(
+            "python/mozbuild/mozbuild/build_commands.py"
+        ),
+        "build-backend": MachCommandReference(
+            "python/mozbuild/mozbuild/build_commands.py"
+        ),
+        "clang-tidy": MachCommandReference(
+            "python/mozbuild/mozbuild/code_analysis/mach_commands.py"
+        ),
+        "static-analysis": MachCommandReference(
+            "python/mozbuild/mozbuild/code_analysis/mach_commands.py"
+        ),
+        "prettier-format": MachCommandReference(
+            "python/mozbuild/mozbuild/code_analysis/mach_commands.py"
+        ),
+        "clang-format": MachCommandReference(
+            "python/mozbuild/mozbuild/code_analysis/mach_commands.py"
+        ),
+        "compileflags": MachCommandReference(
+            "python/mozbuild/mozbuild/compilation/codecomplete.py"
+        ),
+        "mozbuild-reference": MachCommandReference(
+            "python/mozbuild/mozbuild/frontend/mach_commands.py"
+        ),
+        "file-info": MachCommandReference(
+            "python/mozbuild/mozbuild/frontend/mach_commands.py"
+        ),
+        "vendor": MachCommandReference(
+            "python/mozbuild/mozbuild/vendor/mach_commands.py"
+        ),
+        "watch": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "cargo": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "doctor": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "clobber": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "show-log": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "warnings-summary": MachCommandReference(
+            "python/mozbuild/mozbuild/mach_commands.py"
+        ),
+        "warnings-list": MachCommandReference(
+            "python/mozbuild/mozbuild/mach_commands.py"
+        ),
+        "gtest": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "package": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "install": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "run": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "buildsymbols": MachCommandReference(
+            "python/mozbuild/mozbuild/mach_commands.py"
+        ),
+        "environment": MachCommandReference(
+            "python/mozbuild/mozbuild/mach_commands.py"
+        ),
+        "repackage": MachCommandReference("python/mozbuild/mozbuild/mach_commands.py"),
+        "package-multi-locale": MachCommandReference(
+            "python/mozbuild/mozbuild/mach_commands.py"
+        ),
+        "perftest": MachCommandReference(
+            "python/mozperftest/mozperftest/mach_commands.py"
+        ),
+        "perftest-test": MachCommandReference(
+            "python/mozperftest/mozperftest/mach_commands.py"
+        ),
+        "release": MachCommandReference(
+            "python/mozrelease/mozrelease/mach_commands.py"
+        ),
+        "remote": MachCommandReference("remote/mach_commands.py"),
+        "puppeteer-test": MachCommandReference("remote/mach_commands.py"),
+        "generate-test-certs": MachCommandReference(
+            "security/manager/tools/mach_commands.py"
+        ),
+        "taskgraph": MachCommandReference("taskcluster/mach_commands.py"),
+        "taskcluster-load-image": MachCommandReference("taskcluster/mach_commands.py"),
+        "taskcluster-build-image": MachCommandReference("taskcluster/mach_commands.py"),
+        "taskcluster-image-digest": MachCommandReference(
+            "taskcluster/mach_commands.py"
+        ),
+        "release-history": MachCommandReference("taskcluster/mach_commands.py"),
+        "awsy-test": MachCommandReference("testing/awsy/mach_commands.py"),
+        "fetch-condprofile": MachCommandReference(
+            "testing/condprofile/mach_commands.py"
+        ),
+        "run-condprofile": MachCommandReference("testing/condprofile/mach_commands.py"),
+        "firefox-ui-functional": MachCommandReference(
+            "testing/firefox-ui/mach_commands.py"
+        ),
+        "geckodriver": MachCommandReference("testing/geckodriver/mach_commands.py"),
+        "addtest": MachCommandReference("testing/mach_commands.py"),
+        "test": MachCommandReference("testing/mach_commands.py"),
+        "cppunittest": MachCommandReference("testing/mach_commands.py"),
+        "jstests": MachCommandReference("testing/mach_commands.py"),
+        "jit-test": MachCommandReference("testing/mach_commands.py"),
+        "jsapi-tests": MachCommandReference("testing/mach_commands.py"),
+        "jsshell-bench": MachCommandReference("testing/mach_commands.py"),
+        "cramtest": MachCommandReference("testing/mach_commands.py"),
+        "test-info": MachCommandReference("testing/mach_commands.py"),
+        "rusttests": MachCommandReference("testing/mach_commands.py"),
+        "fluent-migration-test": MachCommandReference("testing/mach_commands.py"),
+        "marionette-test": MachCommandReference("testing/marionette/mach_commands.py"),
+        "mochitest": MachCommandReference("testing/mochitest/mach_commands.py"),
+        "geckoview-junit": MachCommandReference("testing/mochitest/mach_commands.py"),
+        "mozharness": MachCommandReference("testing/mozharness/mach_commands.py"),
+        "raptor": MachCommandReference("testing/raptor/mach_commands.py"),
+        "raptor-test": MachCommandReference("testing/raptor/mach_commands.py"),
+        "talos-test": MachCommandReference("testing/talos/mach_commands.py"),
+        "tps-build": MachCommandReference("testing/tps/mach_commands.py"),
+        "web-platform-tests": MachCommandReference(
+            "testing/web-platform/mach_commands.py"
+        ),
+        "wpt": MachCommandReference("testing/web-platform/mach_commands.py"),
+        "web-platform-tests-update": MachCommandReference(
+            "testing/web-platform/mach_commands.py"
+        ),
+        "wpt-update": MachCommandReference("testing/web-platform/mach_commands.py"),
+        "wpt-manifest-update": MachCommandReference(
+            "testing/web-platform/mach_commands.py"
+        ),
+        "wpt-serve": MachCommandReference("testing/web-platform/mach_commands.py"),
+        "wpt-metadata-summary": MachCommandReference(
+            "testing/web-platform/mach_commands.py"
+        ),
+        "wpt-metadata-merge": MachCommandReference(
+            "testing/web-platform/mach_commands.py"
+        ),
+        "wpt-unittest": MachCommandReference("testing/web-platform/mach_commands.py"),
+        "wpt-test-paths": MachCommandReference("testing/web-platform/mach_commands.py"),
+        "wpt-fission-regressions": MachCommandReference(
+            "testing/web-platform/mach_commands.py"
+        ),
+        "xpcshell-test": MachCommandReference("testing/xpcshell/mach_commands.py"),
+        "telemetry-tests-client": MachCommandReference(
+            "toolkit/components/telemetry/tests/marionette/mach_commands.py"
+        ),
+        "data-review": MachCommandReference(
+            "toolkit/components/glean/build_scripts/mach_commands.py"
+        ),
+        "perf-data-review": MachCommandReference(
+            "toolkit/components/glean/build_scripts/mach_commands.py"
+        ),
+        "update-glean-tags": MachCommandReference(
+            "toolkit/components/glean/build_scripts/mach_commands.py"
+        ),
+        "update-glean": MachCommandReference(
+            "toolkit/components/glean/build_scripts/mach_commands.py"
+        ),
+        "browsertime": MachCommandReference("tools/browsertime/mach_commands.py"),
+        "compare-locales": MachCommandReference(
+            "tools/compare-locales/mach_commands.py"
+        ),
+        "l10n-cross-channel": MachCommandReference("tools/lint/mach_commands.py"),
+        "busted": MachCommandReference("tools/mach_commands.py"),
+        "pastebin": MachCommandReference("tools/mach_commands.py"),
+        "mozregression": MachCommandReference("tools/mach_commands.py"),
+        "node": MachCommandReference("tools/mach_commands.py"),
+        "npm": MachCommandReference("tools/mach_commands.py"),
+        "logspam": MachCommandReference("tools/mach_commands.py"),
+        "doc": MachCommandReference("tools/moztreedocs/mach_commands.py"),
+        "install-moz-phab": MachCommandReference("tools/phabricator/mach_commands.py"),
+        "power": MachCommandReference("tools/power/mach_commands.py"),
+        "try": MachCommandReference("tools/tryselect/mach_commands.py"),
+        "import-pr": MachCommandReference("tools/vcs/mach_commands.py"),
+        "test-interventions": MachCommandReference(
+            "testing/webcompat/mach_commands.py"
+        ),
+        "esmify": MachCommandReference("tools/esmify/mach_commands.py"),
+        "xpcshell": MachCommandReference("js/xpconnect/mach_commands.py"),
+        "uniffi": MachCommandReference(
+            "toolkit/components/uniffi-bindgen-gecko-js/mach_commands.py"
+        ),
+        "storybook": MachCommandReference(
+            "browser/components/storybook/mach_commands.py"
+        ),
+        "widgets": MachCommandReference("toolkit/content/widgets/mach_commands.py"),
+    }
+
+    # Set a reasonable limit to the number of open files.
+    #
+    # Some linux systems set `ulimit -n` to a very high number, which works
+    # well for systems that run servers, but this setting causes performance
+    # problems when programs close file descriptors before forking, like
+    # Python's `subprocess.Popen(..., close_fds=True)` (close_fds=True is the
+    # default in Python 3), or Rust's stdlib.  In some cases, Firefox does the
+    # same thing when spawning processes.  We would prefer to lower this limit
+    # to avoid such performance problems; processes spawned by `mach` will
+    # inherit the limit set here.
+    #
+    # The Firefox build defaults the soft limit to 1024, except for builds that
+    # do LTO, where the soft limit is 8192.  We're going to default to the
+    # latter, since people do occasionally do LTO builds on their local
+    # machines, and requiring them to discover another magical setting after
+    # setting up an LTO build in the first place doesn't seem good.
+    #
+    # This code mimics the code in taskcluster/scripts/run-task.
+    try:
+        import resource
+
+        # Keep the hard limit the same, though, allowing processes to change
+        # their soft limit if they need to (Firefox does, for instance).
+        (soft, hard) = resource.getrlimit(resource.RLIMIT_NOFILE)
+        # Permit people to override our default limit if necessary via
+        # MOZ_LIMIT_NOFILE, which is the same variable `run-task` uses.
+        limit = os.environ.get("MOZ_LIMIT_NOFILE")
+        if limit:
+            limit = int(limit)
+        else:
+            # If no explicit limit is given, use our default if it's less than
+            # the current soft limit.  For instance, the default on macOS is
+            # 256, so we'd pick that rather than our default.
+            limit = min(soft, 8192)
+        # Now apply the limit, if it's different from the original one.
+        if limit != soft:
+            resource.setrlimit(resource.RLIMIT_NOFILE, (limit, hard))
+    except ImportError:
+        # The resource module is UNIX only.
+        pass
+
+    def resolve_repository():
+        import mozversioncontrol
+
+        try:
+            # This API doesn't respect the vcs binary choices from configure.
+            # If we ever need to use the VCS binary here, consider something
+            # more robust.
+            return mozversioncontrol.get_repository_object(path=topsrcdir)
+        except (mozversioncontrol.InvalidRepoPath, mozversioncontrol.MissingVCSTool):
+            return None
+
+    def pre_dispatch_handler(context, handler, args):
+        # If --disable-tests flag was enabled in the mozconfig used to compile
+        # the build, tests will be disabled. Instead of trying to run
+        # nonexistent tests then reporting a failure, this will prevent mach
+        # from progressing beyond this point.
+        if handler.category == "testing" and not handler.ok_if_tests_disabled:
+            from mozbuild.base import BuildEnvironmentNotFoundException
+
+            try:
+                from mozbuild.base import MozbuildObject
+
+                # all environments should have an instance of build object.
+                build = MozbuildObject.from_environment()
+                if build is not None and not getattr(
+                    build, "substs", {"ENABLE_TESTS": True}
+                ).get("ENABLE_TESTS"):
+                    print(
+                        "Tests have been disabled with --disable-tests.\n"
+                        + "Remove the flag, and re-compile to enable tests."
+                    )
+                    sys.exit(1)
+            except BuildEnvironmentNotFoundException:
+                # likely automation environment, so do nothing.
+                pass
+
+    def post_dispatch_handler(
+        context, handler, instance, success, start_time, end_time, depth, args
+    ):
+        """Perform global operations after command dispatch.
+
+
+        For now,  we will use this to handle build system telemetry.
+        """
+
+        # Don't finalize telemetry data if this mach command was invoked as part of
+        # another mach command.
+        if depth != 1:
+            return
+
+        _finalize_telemetry_glean(
+            context.telemetry, handler.name == "bootstrap", success
+        )
+
+    def populate_context(key=None):
+        if key is None:
+            return
+        if key == "state_dir":
+            return state_dir
+
+        if key == "local_state_dir":
+            return get_state_dir(specific_to_topsrcdir=True)
+
+        if key == "topdir":
+            return topsrcdir
+
+        if key == "pre_dispatch_handler":
+            return pre_dispatch_handler
+
+        if key == "post_dispatch_handler":
+            return post_dispatch_handler
+
+        if key == "repository":
+            return resolve_repository()
+
+        raise AttributeError(key)
+
+    # Note which process is top-level so that recursive mach invocations can avoid writing
+    # telemetry data.
+    if "MACH_MAIN_PID" not in os.environ:
+        setenv("MACH_MAIN_PID", str(os.getpid()))
+
+    driver = mach.main.Mach(os.getcwd())
+    driver.populate_context_handler = populate_context
+
+    if not driver.settings_paths:
+        # default global machrc location
+        driver.settings_paths.append(state_dir)
+    # always load local repository configuration
+    driver.settings_paths.append(topsrcdir)
+
+    for category, meta in CATEGORIES.items():
+        driver.define_category(category, meta["short"], meta["long"], meta["priority"])
+
+    # Sparse checkouts may not have all mach_commands.py files. Ignore
+    # errors from missing files. Same for spidermonkey tarballs.
+    repo = resolve_repository()
+    if repo != "SOURCE":
+        missing_ok = (
+            repo is not None and repo.sparse_checkout_present()
+        ) or os.path.exists(os.path.join(topsrcdir, "INSTALL"))
+    else:
+        missing_ok = ()
+    driver.load_commands_from_spec(MACH_COMMANDS, topsrcdir, missing_ok=missing_ok)
+    return driver
+
+
+def _finalize_telemetry_glean(telemetry, is_bootstrap, success):
+    """Submit telemetry collected by Glean.
+
+    Finalizes some metrics (command success state and duration, system information) and
+    requests Glean to send the collected data.
+    """
+
+    from mach.telemetry import MACH_METRICS_PATH
+    from mozbuild.telemetry import (
+        get_cpu_brand,
+        get_distro_and_version,
+        get_psutil_stats,
+        get_shell_info,
+        get_vscode_running,
+    )
+
+    mach_metrics = telemetry.metrics(MACH_METRICS_PATH)
+    mach_metrics.mach.duration.stop()
+    mach_metrics.mach.success.set(success)
+    system_metrics = mach_metrics.mach.system
+    cpu_brand = get_cpu_brand()
+    if cpu_brand:
+        system_metrics.cpu_brand.set(cpu_brand)
+    distro, version = get_distro_and_version()
+    system_metrics.distro.set(distro)
+    system_metrics.distro_version.set(version)
+
+    vscode_terminal, ssh_connection = get_shell_info()
+    system_metrics.vscode_terminal.set(vscode_terminal)
+    system_metrics.ssh_connection.set(ssh_connection)
+    system_metrics.vscode_running.set(get_vscode_running())
+
+    has_psutil, logical_cores, physical_cores, memory_total = get_psutil_stats()
+    if has_psutil:
+        # psutil may not be available (we may not have been able to download
+        # a wheel or build it from source).
+        system_metrics.logical_cores.add(logical_cores)
+        if physical_cores is not None:
+            system_metrics.physical_cores.add(physical_cores)
+        if memory_total is not None:
+            system_metrics.memory.accumulate(
+                int(math.ceil(float(memory_total) / (1024 * 1024 * 1024)))
+            )
+    telemetry.submit(is_bootstrap)
+
+
+def _create_state_dir():
+    # 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.
+    state_dir = os.environ.get("MOZBUILD_STATE_PATH")
+    if state_dir:
+        if not os.path.exists(state_dir):
+            print(
+                "Creating global state directory from environment variable: {}".format(
+                    state_dir
+                )
+            )
+    else:
+        state_dir = os.path.expanduser("~/.mozbuild")
+        if not os.path.exists(state_dir):
+            if not os.environ.get("MOZ_AUTOMATION"):
+                print(STATE_DIR_FIRST_RUN.format(state_dir))
+
+            print("Creating default state directory: {}".format(state_dir))
+
+    os.makedirs(state_dir, mode=0o770, exist_ok=True)
+    return state_dir
+
+
+# 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, level=-1):
+        if sys.version_info[0] >= 3 and level < 0:
+            level = 0
+
+        # 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
+        self._modules.add(resolved_name)
+
+        # Builtin modules don't have a __file__ attribute.
+        if not getattr(module, "__file__", None):
+            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]):
+            if os.path.exists(module.__file__):
+                os.remove(module.__file__)
+            del sys.modules[module.__name__]
+            module = self(name, globals, locals, fromlist, level)
+
+        return module
+
+
+# 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 FinderHook(MetaPathFinder):
+    def __init__(self, klass):
+        # 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.finder_class = klass
+
+    def find_spec(self, full_name, paths=None, target=None):
+        spec = self.finder_class.find_spec(full_name, paths, target)
+
+        # Some modules don't have an origin.
+        if spec is None or spec.origin is None:
+            return spec
+
+        # Normalize the origin path.
+        path = os.path.normcase(os.path.abspath(spec.origin))
+        # 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 spec
+
+        # Ignore modules outside our source directory
+        if not path.startswith(self._source_dir):
+            return spec
+
+        # If there is no .py corresponding to the .pyc/.pyo module we're
+        # resolving, remove the .pyc/.pyo file, and try again.
+        if not os.path.exists(spec.origin[:-1]):
+            if os.path.exists(spec.origin):
+                os.remove(spec.origin)
+            spec = self.finder_class.find_spec(full_name, paths, target)
+
+        return spec
+
+
+# Additional hook for python >= 3.8's importlib.metadata.
+class MetadataHook(FinderHook):
+    def find_distributions(self, *args, **kwargs):
+        return self.finder_class.find_distributions(*args, **kwargs)
+
+
+def hook(finder):
+    has_find_spec = hasattr(finder, "find_spec")
+    has_find_distributions = hasattr(finder, "find_distributions")
+    if has_find_spec and has_find_distributions:
+        return MetadataHook(finder)
+    elif has_find_spec:
+        return FinderHook(finder)
+    return finder
+
+
+# Install our hook. This can be deleted when the Python 3 migration is complete.
+if sys.version_info[0] < 3:
+    builtins.__import__ = ImportHook(builtins.__import__)
+else:
+    sys.meta_path = [hook(c) for c in sys.meta_path]