[find_integration_revision.py] new script
...does what it says on the tin.
Test: ./find_integration_revision.py garnet b1536fd
Change-Id: I3dbd70810cd0e1a2324b5cc76c0c1f3be84fb25a
diff --git a/find_integration_revision.py b/find_integration_revision.py
new file mode 100755
index 0000000..aa8e110
--- /dev/null
+++ b/find_integration_revision.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python
+
+# Copyright 2018 The Fuchsia Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import itertools
+import os
+import subprocess
+import sys
+import xml.etree.ElementTree as ET
+
+
+def main():
+ parser = argparse.ArgumentParser(
+ description="Find the first integration revision that integrated"
+ "a given petal revision.")
+ parser.add_argument("petal_path")
+ parser.add_argument("petal_revision")
+ args = parser.parse_args()
+
+ fuchsia_dir = os.environ["FUCHSIA_DIR"]
+
+ imports = ET.parse(os.path.join(
+ fuchsia_dir,
+ ".jiri_manifest")).findall('./imports/import[@name=\'integration\']')
+
+ components = []
+ for n in imports:
+ if n.attrib["remote"].startswith("sso://"):
+ components.append("fuchsia")
+ break
+
+ components.extend([args.petal_path, "minimal"])
+
+ integration_dir = os.path.join(fuchsia_dir, "integration")
+ petal_dir = os.path.join(fuchsia_dir, args.petal_path)
+
+ manifest_path = os.path.join(*components)
+ project_xpath = './projects/project[@name=\'%s\']' % args.petal_path
+
+ # Used to avoid shelling out to git multiple times with same petal revision.
+ last_petal_revision_checked = None
+ descendant_found = False
+ for i in itertools.count(start=0, step=1):
+ manifest_string = subprocess.check_output([
+ "git",
+ "-C",
+ integration_dir,
+ "show",
+ "HEAD~%d:%s" % (i, manifest_path),
+ ])
+ for project in ET.fromstring(manifest_string).findall(project_xpath):
+ petal_revision_at_integration_revision = project.attrib["revision"]
+
+ if petal_revision_at_integration_revision != last_petal_revision_checked:
+ last_petal_revision_checked = petal_revision_at_integration_revision
+ if not subprocess.call([
+ "git",
+ "-C",
+ petal_dir,
+ "merge-base",
+ "--is-ancestor",
+ args.petal_revision,
+ petal_revision_at_integration_revision,
+ ]):
+ descendant_found = True
+ elif descendant_found:
+ subprocess.check_call(
+ [
+ "git",
+ "-C",
+ integration_dir,
+ "rev-parse",
+ "HEAD~%d" % (i - 1),
+ ],
+ stdout=sys.stdout,
+ stderr=sys.stderr,
+ )
+ break
+
+
+if __name__ == "__main__":
+ main()
