1 files changed, 109 insertions, 0 deletions
diff --git a/www/wiki/maintenance/migrateUserGroup.php b/www/wiki/maintenance/migrateUserGroup.php
new file mode 100644
index 00000000..bf8d071c
--- /dev/null
+++ b/www/wiki/maintenance/migrateUserGroup.php
@@ -0,0 +1,109 @@
+<?php
+/**
+ * Re-assign users from an old group to a new one
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Maintenance
+ */
+
+require_once __DIR__ . '/Maintenance.php';
+
+/**
+ * Maintenance script that re-assigns users from an old group to a new one.
+ *
+ * @ingroup Maintenance
+ */
+class MigrateUserGroup extends Maintenance {
+	public function __construct() {
+		parent::__construct();
+		$this->addDescription( 'Re-assign users from an old group to a new one' );
+		$this->addArg( 'oldgroup', 'Old user group key', true );
+		$this->addArg( 'newgroup', 'New user group key', true );
+		$this->setBatchSize( 200 );
+	}
+
+	public function execute() {
+		$count = 0;
+		$oldGroup = $this->getArg( 0 );
+		$newGroup = $this->getArg( 1 );
+		$dbw = $this->getDB( DB_MASTER );
+		$batchSize = $this->getBatchSize();
+		$start = $dbw->selectField( 'user_groups', 'MIN(ug_user)',
+			[ 'ug_group' => $oldGroup ], __FUNCTION__ );
+		$end = $dbw->selectField( 'user_groups', 'MAX(ug_user)',
+			[ 'ug_group' => $oldGroup ], __FUNCTION__ );
+		if ( $start === null ) {
+			$this->fatalError( "Nothing to do - no users in the '$oldGroup' group" );
+		}
+		# Do remaining chunk
+		$end += $batchSize - 1;
+		$blockStart = $start;
+		$blockEnd = $start + $batchSize - 1;
+		// Migrate users over in batches...
+		while ( $blockEnd <= $end ) {
+			$affected = 0;
+			$this->output( "Doing users $blockStart to $blockEnd\n" );
+
+			$this->beginTransaction( $dbw, __METHOD__ );
+			$dbw->update( 'user_groups',
+				[ 'ug_group' => $newGroup ],
+				[ 'ug_group' => $oldGroup,
+					"ug_user BETWEEN " . (int)$blockStart . " AND " . (int)$blockEnd ],
+				__METHOD__,
+				[ 'IGNORE' ]
+			);
+			$affected += $dbw->affectedRows();
+			// Delete rows that the UPDATE operation above had to ignore.
+			// This happens when a user is in both the old and new group.
+			// Updating the row for the old group membership failed since
+			// user/group is UNIQUE.
+			$dbw->delete( 'user_groups',
+				[ 'ug_group' => $oldGroup,
+					"ug_user BETWEEN " . (int)$blockStart . " AND " . (int)$blockEnd ],
+				__METHOD__
+			);
+			$affected += $dbw->affectedRows();
+			$this->commitTransaction( $dbw, __METHOD__ );
+
+			// Clear cache for the affected users (T42340)
+			if ( $affected > 0 ) {
+				// XXX: This also invalidates cache of unaffected users that
+				// were in the new group and not in the group.
+				$res = $dbw->select( 'user_groups', 'ug_user',
+					[ 'ug_group' => $newGroup,
+						"ug_user BETWEEN " . (int)$blockStart . " AND " . (int)$blockEnd ],
+					__METHOD__
+				);
+				if ( $res !== false ) {
+					foreach ( $res as $row ) {
+						$user = User::newFromId( $row->ug_user );
+						$user->invalidateCache();
+					}
+				}
+			}
+
+			$count += $affected;
+			$blockStart += $batchSize;
+			$blockEnd += $batchSize;
+		}
+		$this->output( "Done! $count users in group '$oldGroup' are now in '$newGroup' instead.\n" );
+	}
+}
+
+$maintClass = MigrateUserGroup::class;
+require_once RUN_MAINTENANCE_IF_MAIN;