1 files changed, 97 insertions, 0 deletions
diff --git a/www/wiki/maintenance/oracle/alterSharedConstraints.php b/www/wiki/maintenance/oracle/alterSharedConstraints.php
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+++ b/www/wiki/maintenance/oracle/alterSharedConstraints.php
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+<?php
+/**
+ * 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
+ */
+
+use Wikimedia\Rdbms\DBQueryError;
+
+/**
+ * When using shared tables that are referenced by foreign keys on local
+ * tables you have to change the constraints on local tables.
+ *
+ * The shared tables have to have GRANT REFERENCE on shared tables to local schema
+ * i.e.: GRANT REFERENCES (user_id) ON mwuser TO hubclient;
+ */
+
+require_once __DIR__ . '/../Maintenance.php';
+
+class AlterSharedConstraints extends Maintenance {
+	public function __construct() {
+		parent::__construct();
+		$this->addDescription( 'Alter foreign key to reference master tables in shared database setup.' );
+	}
+
+	public function getDbType() {
+		return Maintenance::DB_ADMIN;
+	}
+
+	public function execute() {
+		global $wgSharedDB, $wgSharedTables, $wgSharedPrefix, $wgDBprefix;
+
+		if ( $wgSharedDB == null ) {
+			$this->output( "Database sharing is not enabled\n" );
+
+			return;
+		}
+
+		$dbw = $this->getDB( DB_MASTER );
+		foreach ( $wgSharedTables as $table ) {
+			$stable = $dbw->tableNameInternal( $table );
+			if ( $wgSharedPrefix != null ) {
+				$ltable = preg_replace( "/^$wgSharedPrefix(.*)/i", "$wgDBprefix\\1", $stable );
+			} else {
+				$ltable = "{$wgDBprefix}{$stable}";
+			}
+
+			$result = $dbw->query( "SELECT uc.constraint_name, uc.table_name, ucc.column_name,
+						uccpk.table_name pk_table_name, uccpk.column_name pk_column_name,
+						uc.delete_rule, uc.deferrable, uc.deferred
+					FROM user_constraints uc, user_cons_columns ucc, user_cons_columns uccpk
+					WHERE uc.constraint_type = 'R'
+						AND ucc.constraint_name = uc.constraint_name
+						AND uccpk.constraint_name = uc.r_constraint_name
+						AND uccpk.table_name = '$ltable'" );
+
+			while ( ( $row = $result->fetchRow() ) !== false ) {
+				$this->output( "Altering {$row['constraint_name']} ..." );
+
+				try {
+					$dbw->query( "ALTER TABLE {$row['table_name']}
+							DROP CONSTRAINT {$wgDBprefix}{$row['constraint_name']}" );
+				} catch ( DBQueryError $exdb ) {
+					if ( $exdb->errno != 2443 ) {
+						throw $exdb;
+					}
+				}
+
+				$deleteRule = $row['delete_rule'] == 'NO ACTION' ? '' : "ON DELETE {$row['delete_rule']}";
+				$dbw->query( "ALTER TABLE {$row['table_name']}
+						ADD CONSTRAINT {$wgDBprefix}{$row['constraint_name']}
+						FOREIGN KEY ({$row['column_name']})
+						REFERENCES {$wgSharedDB}.$stable({$row['pk_column_name']})
+						{$deleteRule} {$row['deferrable']} INITIALLY {$row['deferred']}" );
+
+				$this->output( "DONE\n" );
+			}
+		}
+	}
+}
+
+$maintClass = AlterSharedConstraints::class;
+require_once RUN_MAINTENANCE_IF_MAIN;