Avoid using WPT test runner to update the test manifest.

etc/ci/manifest_changed.sh

@@ -8,20 +8,4 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-echo "About to update manifest."
-
-# We shouldn't need any binary at all to update the manifests.
-# Adding "SKIP_TESTS" to skip tests, it doesn't really skip the tests.
-# It will run "run_wpt" with "'test_list': ['SKIP_TESTS']",
-# and then pass it into wptrunner, which won't be able to find any tests named
-# "SKIP_TESTS", and thus won't run any.
-# Adding "--binary=" to skip looking for a compiled servo binary.
-./mach test-wpt --manifest-update --binary= SKIP_TESTS
-
-echo "Updated manifest; about to check if any changes were made to it."
-echo "If a diff is present, please run './mach update-manifest' \
-and commit the change."
-
-diff="$(git diff -- tests/*/MANIFEST.json)"
-echo "${diff}"
-[[ -z "${diff}" ]]
+./mach update-manifest --check-clean

python/servo/testing_commands.py

@@ -77,6 +77,19 @@ def create_parser_wpt():
     return parser
 
 
+def create_parser_manifest_update():
+    import manifestupdate
+    return manifestupdate.create_parser()
+
+
+def run_update(topdir, check_clean=False, rebuild=False, **kwargs):
+    import manifestupdate
+    from wptrunner import wptlogging
+    logger = wptlogging.setup(kwargs, {"mach": sys.stdout})
+    wpt_dir = os.path.abspath(os.path.join(topdir, 'tests', 'wpt'))
+    manifestupdate.update(logger, wpt_dir, check_clean, rebuild)
+
+
 @CommandProvider
 class MachCommands(CommandBase):
     DEFAULT_RENDER_MODE = "cpu"
@@ -429,11 +442,9 @@ class MachCommands(CommandBase):
     @Command('update-manifest',
              description='Run test-wpt --manifest-update SKIP_TESTS to regenerate MANIFEST.json',
              category='testing',
-             parser=create_parser_wpt)
+             parser=create_parser_manifest_update)
     def update_manifest(self, **kwargs):
-        kwargs['test_list'].append(str('SKIP_TESTS'))
-        kwargs['manifest_update'] = True
-        return self.test_wpt(**kwargs)
+        return run_update(self.context.topdir, **kwargs)
 
     @Command('update-wpt',
              description='Update the web platform tests',

tests/wpt/manifestupdate.py

@@ -0,0 +1,157 @@
+# 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 argparse
+import imp
+import os
+import sys
+from collections import defaultdict
+
+from mozlog.structured import commandline
+from wptrunner.wptcommandline import get_test_paths, set_from_config
+
+manifest = None
+
+
+def do_delayed_imports(wpt_dir):
+    global manifest
+    sys.path.insert(0, os.path.join(wpt_dir, "tools", "manifest"))
+    import manifest  # noqa
+
+
+def create_parser():
+    p = argparse.ArgumentParser()
+    p.add_argument("--check-clean", action="store_true",
+                   help="Check that updating the manifest doesn't lead to any changes")
+    p.add_argument("--rebuild", action="store_true",
+                   help="Rebuild the manifest from scratch")
+    commandline.add_logging_group(p)
+
+    return p
+
+
+def update(logger, wpt_dir, check_clean=True, rebuild=False):
+    localpaths = imp.load_source("localpaths",  # noqa
+                                 os.path.join(wpt_dir, "web-platform-tests", "tools", "localpaths.py"))
+    kwargs = {"config": os.path.join(wpt_dir, "config.ini"),
+              "manifest_path": os.path.join(wpt_dir, "metadata"),
+              "tests_root": None,
+              "metadata_root": None}
+
+    set_from_config(kwargs)
+    config = kwargs["config"]
+    test_paths = get_test_paths(config)
+
+    do_delayed_imports(wpt_dir)
+
+    if check_clean:
+        return _check_clean(logger, test_paths)
+
+    return _update(logger, test_paths, rebuild)
+
+
+def _update(logger, test_paths, rebuild):
+    for url_base, paths in test_paths.iteritems():
+        manifest_path = os.path.join(paths["metadata_path"], "MANIFEST.json")
+        if rebuild:
+            m = manifest.manifest.Manifest(url_base)
+        else:
+            m = manifest.manifest.load(paths["tests_path"], manifest_path)
+        manifest.update.update(paths["tests_path"], m, working_copy=True)
+        manifest.manifest.write(m, manifest_path)
+    return 0
+
+
+def _check_clean(logger, test_paths):
+    manifests_by_path = {}
+    rv = 0
+    for url_base, paths in test_paths.iteritems():
+        tests_path = paths["tests_path"]
+        manifest_path = os.path.join(paths["metadata_path"], "MANIFEST.json")
+        old_manifest = manifest.manifest.load(tests_path, manifest_path)
+        new_manifest = manifest.manifest.Manifest.from_json(tests_path,
+                                                            old_manifest.to_json())
+        manifest.update.update(tests_path, new_manifest, working_copy=True)
+        manifests_by_path[manifest_path] = (old_manifest, new_manifest)
+
+    for manifest_path, (old_manifest, new_manifest) in manifests_by_path.iteritems():
+        if not diff_manifests(logger, manifest_path, old_manifest, new_manifest):
+            rv = 1
+    if rv:
+        logger.error("Manifest %s is outdated, use |./mach update-manifest| to fix." % manifest_path)
+
+    return rv
+
+
+def diff_manifests(logger, manifest_path, old_manifest, new_manifest):
+    """Lint the differences between old and new versions of a
+    manifest. Differences are considered significant (and so produce
+    lint errors) if they produce a meaningful difference in the actual
+    tests run.
+
+    :param logger: mozlog logger to use for output
+    :param manifest_path: Path to the manifest being linted
+    :param old_manifest: Manifest object representing the initial manifest
+    :param new_manifest: Manifest object representing the updated manifest
+    """
+    logger.info("Diffing old and new manifests %s" % manifest_path)
+    old_items, new_items = defaultdict(set), defaultdict(set)
+    for manifest, items in [(old_manifest, old_items),
+                            (new_manifest, new_items)]:
+        for test_type, path, tests in manifest:
+            for test in tests:
+                test_id = [test.id]
+                test_id.extend(tuple(item) if isinstance(item, list) else item
+                               for item in test.meta_key())
+                if hasattr(test, "references"):
+                    test_id.extend(tuple(item) for item in test.references)
+                test_id = tuple(test_id)
+                items[path].add((test_type, test_id))
+
+    old_paths = set(old_items.iterkeys())
+    new_paths = set(new_items.iterkeys())
+
+    added_paths = new_paths - old_paths
+    deleted_paths = old_paths - new_paths
+
+    common_paths = new_paths & old_paths
+
+    clean = True
+
+    for path in added_paths:
+        clean = False
+        log_error(logger, manifest_path, "%s in source but not in manifest." % path)
+    for path in deleted_paths:
+        clean = False
+        log_error(logger, manifest_path, "%s in manifest but removed from source." % path)
+
+    for path in common_paths:
+        old_tests = old_items[path]
+        new_tests = new_items[path]
+        added_tests = new_tests - old_tests
+        removed_tests = old_tests - new_tests
+        if added_tests or removed_tests:
+            clean = False
+            log_error(logger, manifest_path, "%s changed test types or metadata" % path)
+
+    if clean:
+        # Manifest currently has some list vs tuple inconsistencies that break
+        # a simple equality comparison.
+        new_paths = {(key, value[0], value[1])
+                     for (key, value) in new_manifest.to_json()["paths"].iteritems()}
+        old_paths = {(key, value[0], value[1])
+                     for (key, value) in old_manifest.to_json()["paths"].iteritems()}
+        if old_paths != new_paths:
+            logger.warning("Manifest %s contains correct tests but file hashes changed." % manifest_path)  # noqa
+            clean = False
+
+    return clean
+
+
+def log_error(logger, manifest_path, msg):
+    logger.lint_error(path=manifest_path,
+                      message=msg,
+                      lineno=0,
+                      source="",
+                      linter="wpt-manifest")