repair search lucene before installing

lib/private/repair.php

@@ -84,7 +84,8 @@ class Repair extends BasicEmitter {
 	public static function getBeforeUpgradeRepairSteps() {
 		return array(
 			new \OC\Repair\InnoDB(),
-			new \OC\Repair\Collation(\OC::$server->getConfig(), \OC_DB::getConnection())
+			new \OC\Repair\Collation(\OC::$server->getConfig(), \OC_DB::getConnection()),
+			new \OC\Repair\SearchLuceneTables()
 		);
 	}
 

lib/repair/innodb.php

@@ -23,7 +23,7 @@ class InnoDB extends BasicEmitter implements \OC\RepairStep {
 	public function run() {
 		$connection = \OC_DB::getConnection();
 		if (!$connection->getDatabasePlatform() instanceof MySqlPlatform) {
-			$this->emit('\OC\Repair', 'info', array('Not a mysql database -> nothing to no'));
+			$this->emit('\OC\Repair', 'info', array('Not a mysql database -> nothing to do'));
 			return;
 		}
 

lib/repair/searchlucenetables.php

+<?php
+/**
+ * Copyright (c) 2014 Jörn Friedrich Dreyer <jfd@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OC\Repair;
+
+use OC\Hooks\BasicEmitter;
+
+class SearchLuceneTables extends BasicEmitter implements \OC\RepairStep {
+
+	public function getName() {
+		return 'Repair duplicate entries in oc_lucene_status';
+	}
+
+	/**
+	 * Fix duplicate entries in oc_lucene_status
+	 *
+	 * search_lucene prior to v0.5.0 did not have a primary key on the lucene_status table. Newer versions do, which
+	 * causes the migration check to fail because it tries to insert duplicate rows into the new schema.
+	 *
+	 * FIXME Currently, apps don't have a way of repairing anything before the migration check:
+	 * @link https://github.com/owncloud/core/issues/10980
+	 *
+	 * As a result this repair step needs to live in the core repo, although it belongs into search_lucene:
+	 * @link https://github.com/owncloud/core/issues/10205#issuecomment-54957557
+	 *
+	 * It will completely remove any rows that make a file id have more than one status:
+	 *  fileid | status                       fileid | status
+	 * --------+--------     will become     --------+--------
+	 *     2   |   E                             3   |   E
+	 *     2   |   I
+	 *     3   |   E
+	 *
+	 * search_lucene will then reindex the fileids without a status when the next indexing job is executed
+	 */
+	public function run() {
+		if (\OC_DB::tableExists('lucene_status')) {
+			$this->emit('\OC\Repair', 'info', array('removing duplicate entries from lucene_status'));
+
+			$connection = \OC_DB::getConnection();
+			$query = $connection->prepare('
+				DELETE FROM `*PREFIX*lucene_status`
+				WHERE `fileid` IN (
+					SELECT `fileid`
+					FROM (
+						SELECT `fileid`
+						FROM `*PREFIX*lucene_status`
+						GROUP BY `fileid`
+						HAVING count(`fileid`) > 1
+					) AS `mysqlerr1093hack`
+				)');
+			$query->execute();
+		} else {
+			$this->emit('\OC\Repair', 'info', array('lucene_status table does not exist -> nothing to do'));
+		}
+	}
+
+}
+