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diff --git a/scripts/repository/undo_commits.php b/scripts/repository/undo_commits.php
new file mode 100755
index 0000000000..e3b4a0694e
--- /dev/null
+++ b/scripts/repository/undo_commits.php
@@ -0,0 +1,194 @@
+#!/usr/bin/env php
+<?php
+
+/*
+ * Copyright 2012 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+$root = dirname(dirname(dirname(__FILE__)));
+require_once $root.'/scripts/__init_script__.php';
+
+$args = new PhutilArgumentParser($argv);
+$args->setTagline('reopen reviews accidentally closed by a bad push');
+$args->setSynopsis(<<<EOSYNOPSIS
+**undo_commits.php** --repository __callsign__ < __commits__
+
+ Reopen code reviews accidentally closed by a bad push. If someone
+ pushes a bunch of commits to a tracked branch that they shouldn't
+ have, you can pipe in all the commit hashes to this script to
+ "undo" the damage in Differential after you revert the commits.
+
+ To use this script:
+
+ 1. Identify the commits you want to undo the effects of.
+ 2. Put all their identifiers (commit hashes in git/hg, revision
+ numbers in svn) into a file, one per line.
+ 3. Pipe that file into this script with relevant arguments.
+ 4. Revisions marked "committed" by those commits will be
+ restored to their previous state.
+
+EOSYNOPSIS
+ );
+$args->parseStandardArguments();
+$args->parse(
+ array(
+ array(
+ 'name' => 'repository',
+ 'param' => 'callsign',
+ 'help' => 'Callsign for the repository these commits appear in.',
+ ),
+ ));
+
+$callsign = $args->getArg('repository');
+if (!$callsign) {
+ $args->printHelpAndExit();
+}
+
+$repository = id(new PhabricatorRepository())->loadOneWhere(
+ 'callsign = %s',
+ $callsign);
+
+if (!$repository) {
+ throw new Exception("No repository with callsign '{$callsign}'!");
+}
+
+echo "Reading commit identifiers from stdin...\n";
+
+$identifiers = @file_get_contents('php://stdin');
+$identifiers = trim($identifiers);
+$identifiers = explode("\n", $identifiers);
+
+echo "Read ".count($identifiers)." commit identifiers.\n";
+
+if (!$identifiers) {
+ throw new Exception("You must provide commmit identifiers on stdin!");
+}
+
+echo "Looking up commits...\n";
+$commits = id(new PhabricatorRepositoryCommit())->loadAllWhere(
+ 'repositoryID = %d AND commitIdentifier IN (%Ls)',
+ $repository->getID(),
+ $identifiers);
+
+echo "Found ".count($commits)." matching commits.\n";
+
+if (!$commits) {
+ throw new Exception("None of the commits could be found!");
+}
+
+$commit_phids = mpull($commits, 'getPHID', 'getPHID');
+
+echo "Looking up revisions marked 'committed' by these commits...\n";
+$revision_ids = queryfx_all(
+ id(new DifferentialRevision())->establishConnection('r'),
+ 'SELECT DISTINCT revisionID from %T WHERE commitPHID IN (%Ls)',
+ DifferentialRevision::TABLE_COMMIT,
+ $commit_phids);
+$revision_ids = ipull($revision_ids, 'revisionID');
+
+echo "Found ".count($revision_ids)." associated revisions.\n";
+if (!$revision_ids) {
+ echo "Done -- nothing to do.\n";
+ return;
+}
+
+$status_committed = ArcanistDifferentialRevisionStatus::COMMITTED;
+
+$revisions = array();
+$map = array();
+
+if ($revision_ids) {
+ foreach ($revision_ids as $revision_id) {
+ echo "Assessing revision D{$revision_id}...\n";
+ $revision = id(new DifferentialRevision())->load($revision_id);
+
+ if ($revision->getStatus() != $status_committed) {
+ echo "Revision is not 'committed', skipping.\n";
+ }
+
+ $assoc_commits = queryfx_all(
+ $revision->establishConnection('r'),
+ 'SELECT commitPHID FROM %T WHERE revisionID = %d',
+ DifferentialRevision::TABLE_COMMIT,
+ $revision_id);
+ $assoc_commits = ipull($assoc_commits, 'commitPHID', 'commitPHID');
+
+ if (array_diff_key($assoc_commits, $commit_phids)) {
+ echo "Revision is associated with other commits, skipping.\n";
+ }
+
+ $comments = id(new DifferentialComment())->loadAllWhere(
+ 'revisionID = %d',
+ $revision_id);
+
+ $new_status = ArcanistDifferentialRevisionStatus::NEEDS_REVIEW;
+ foreach ($comments as $comment) {
+ switch ($comment->getAction()) {
+ case DifferentialAction::ACTION_ACCEPT:
+ $new_status = ArcanistDifferentialRevisionStatus::ACCEPTED;
+ break;
+ case DifferentialAction::ACTION_REJECT:
+ case DifferentialAction::ACTION_RETHINK:
+ $new_status = ArcanistDifferentialRevisionStatus::NEEDS_REVISION;
+ break;
+ case DifferentialAction::ACTION_ABANDON:
+ $new_status = ArcanistDifferentialRevisionStatus::ABANDONED;
+ break;
+ case DifferentialAction::ACTION_RECLAIM:
+ case DifferentialAction::ACTION_UPDATE:
+ $new_status = ArcanistDifferentialRevisionStatus::NEEDS_REVIEW;
+ break;
+ }
+ }
+
+ $revisions[$revision_id] = $revision;
+ $map[$revision_id] = $new_status;
+ }
+}
+
+if (!$revisions) {
+ echo "Done -- nothing to do.\n";
+}
+
+echo "Found ".count($revisions)." revisions to update:\n\n";
+foreach ($revisions as $id => $revision) {
+
+ $old_status = ArcanistDifferentialRevisionStatus::getNameForRevisionStatus(
+ $revision->getStatus());
+ $new_status = ArcanistDifferentialRevisionStatus::getNameForRevisionStatus(
+ $map[$id]);
+
+ echo " - D{$id}: ".$revision->getTitle()."\n";
+ echo " Will update: {$old_status} -> {$new_status}\n\n";
+}
+
+$ok = phutil_console_confirm('Apply these changes?');
+if (!$ok) {
+ echo "Aborted.\n";
+ exit(1);
+}
+
+echo "Saving changes...\n";
+foreach ($revisions as $id => $revision) {
+ queryfx(
+ $revision->establishConnection('r'),
+ 'UPDATE %T SET status = %d WHERE id = %d',
+ $revision->getTableName(),
+ $map[$id],
+ $id);
+}
+echo "Done.\n";
+
+

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Content licensed under Creative Commons Attribution-ShareAlike 4.0 (CC-BY-SA) unless otherwise noted; code licensed under Apache 2.0 or other open source licenses. · CC BY-SA 4.0 · Apache 2.0