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-rw-r--r--taskcluster/gecko_taskgraph/files_changed.py95
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diff --git a/taskcluster/gecko_taskgraph/files_changed.py b/taskcluster/gecko_taskgraph/files_changed.py
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+# 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/.
+
+"""
+Support for optimizing tasks based on the set of files that have changed.
+"""
+
+import logging
+import os
+from subprocess import CalledProcessError
+
+from mozbuild.util import memoize
+from mozpack.path import join as join_path
+from mozpack.path import match as mozpackmatch
+from mozversioncontrol import InvalidRepoPath, get_repository_object
+
+from gecko_taskgraph import GECKO
+from gecko_taskgraph.util.hg import get_json_automationrelevance
+
+logger = logging.getLogger(__name__)
+
+
+@memoize
+def get_changed_files(repository, revision):
+ """
+ Get the set of files changed in the push headed by the given revision.
+ Responses are cached, so multiple calls with the same arguments are OK.
+ """
+ contents = get_json_automationrelevance(repository, revision)
+ try:
+ changesets = contents["changesets"]
+ except KeyError:
+ # We shouldn't hit this error in CI.
+ if os.environ.get("MOZ_AUTOMATION"):
+ raise
+
+ # We're likely on an unpublished commit, grab changed files from
+ # version control.
+ return get_locally_changed_files(GECKO)
+
+ logger.debug("{} commits influencing task scheduling:".format(len(changesets)))
+ changed_files = set()
+ for c in changesets:
+ desc = "" # Support empty desc
+ if c["desc"]:
+ desc = c["desc"].splitlines()[0].encode("ascii", "ignore")
+ logger.debug(" {cset} {desc}".format(cset=c["node"][0:12], desc=desc))
+ changed_files |= set(c["files"])
+
+ return changed_files
+
+
+def check(params, file_patterns):
+ """Determine whether any of the files changed in the indicated push to
+ https://hg.mozilla.org match any of the given file patterns."""
+ repository = params.get("head_repository")
+ revision = params.get("head_rev")
+ if not repository or not revision:
+ logger.warning(
+ "Missing `head_repository` or `head_rev` parameters; "
+ "assuming all files have changed"
+ )
+ return True
+
+ changed_files = get_changed_files(repository, revision)
+
+ if "comm_head_repository" in params:
+ repository = params.get("comm_head_repository")
+ revision = params.get("comm_head_rev")
+ if not revision:
+ logger.warning(
+ "Missing `comm_head_rev` parameters; " "assuming all files have changed"
+ )
+ return True
+
+ changed_files |= {
+ join_path("comm", file) for file in get_changed_files(repository, revision)
+ }
+
+ for pattern in file_patterns:
+ for path in changed_files:
+ if mozpackmatch(path, pattern):
+ return True
+
+ return False
+
+
+@memoize
+def get_locally_changed_files(repo):
+ try:
+ vcs = get_repository_object(repo)
+ return set(vcs.get_outgoing_files("AM"))
+ except (InvalidRepoPath, CalledProcessError):
+ return set()