1 files changed, 87 insertions, 0 deletions
diff --git a/dom/media/webrtc/third_party_build/filter_git_changes.py b/dom/media/webrtc/third_party_build/filter_git_changes.py
new file mode 100644
index 0000000000..ee6cdbcbd9
--- /dev/null
+++ b/dom/media/webrtc/third_party_build/filter_git_changes.py
@@ -0,0 +1,87 @@
+# 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 importlib
+import re
+import sys
+
+sys.path.insert(0, "./dom/media/webrtc/third_party_build")
+vendor_libwebrtc = importlib.import_module("vendor-libwebrtc")
+
+from run_operations import run_git
+
+
+def filter_git_changes(github_path, commit_sha, diff_filter):
+    command = [
+        "git",
+        "show",
+        "--oneline",
+        "--name-status",
+        "--pretty=format:",
+        None if not diff_filter else "--diff-filter={}".format(diff_filter),
+        commit_sha,
+    ]
+    # strip possible empty elements from command list
+    command = " ".join([x for x in command if x is not None])
+
+    # Get the list of changes in the upstream commit.
+    stdout_lines = run_git(command, github_path)
+
+    changed_files = [line.strip() for line in stdout_lines]
+    changed_files = [line for line in changed_files if line != ""]
+
+    # Fetch the list of excludes and includes used in the vendoring script.
+    exclude_file_list = vendor_libwebrtc.get_excluded_files()
+    exclude_dir_list = vendor_libwebrtc.get_excluded_dirs()
+    include_list = vendor_libwebrtc.get_included_path_overrides()
+
+    # First, search for changes in files that are specifically included.
+    # Do this first, because some of these files might be filtered out
+    # by the exclude list.
+    regex_includes = "|".join(["^.\t{}$".format(i) for i in include_list])
+    included_files = [
+        path for path in changed_files if re.findall(regex_includes, path)
+    ]
+
+    # Convert the directory exclude list to a regex string and filter
+    # out the excluded directory paths (note the lack of trailing '$'
+    # in the regex).
+    regex_excludes = "|".join(
+        ["^(M|A|D|R\d\d\d)\t{}".format(i) for i in exclude_dir_list]
+    )
+    files_not_excluded = [
+        path for path in changed_files if not re.findall(regex_excludes, path)
+    ]
+
+    # Convert the file exclude list to a regex string and filter out the
+    # excluded file paths.  The trailing '$' in the regex ensures that
+    # we can exclude, for example, '.vpython' and not '.vpython3'.
+    regex_excludes = "|".join(["^.\t{}$".format(i) for i in exclude_file_list])
+    files_not_excluded = [
+        path for path in files_not_excluded if not re.findall(regex_excludes, path)
+    ]
+
+    return included_files + files_not_excluded
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description="Get relevant change count from an upstream git commit"
+    )
+    parser.add_argument(
+        "--repo-path",
+        required=True,
+        help="path to libwebrtc repo",
+    )
+    parser.add_argument("--commit-sha", required=True, help="sha of commit to examine")
+    parser.add_argument(
+        "--diff-filter",
+        choices=("A", "D", "R"),
+        help="filter for adds (A), deletes (D), or renames (R)",
+    )
+    args = parser.parse_args()
+
+    paths = filter_git_changes(args.repo_path, args.commit_sha, args.diff_filter)
+    for path in paths:
+        print(path)