* Make the MySQL updater work in the new installer

* DatabaseInstaller::doUpgrade() is now abstract

TODO: MysqlUpdater::doUpgrade() is horrible, please someone fix it once it could be

includes/installer/DatabaseInstaller.php

@@ -123,11 +123,10 @@ abstract class DatabaseInstaller {
 	
 	/**
 	 * Perform database upgrades
-	 * @todo make abstract
+	 *
+	 * @return Boolean
 	 */
-	/*abstract*/ function doUpgrade() {
-		return false;
-	}
+	public abstract function doUpgrade();
 	
 	/**
 	 * Allow DB installers a chance to make last-minute changes before installation
@@ -138,6 +137,13 @@ abstract class DatabaseInstaller {
 	
 	}
 
+	/**
+	 * Allow DB installers a chance to make checks before upgrade.
+	 */
+	public function preUpgrade() {
+	
+	}
+
 	/**
 	 * Get an array of MW configuration globals that will be configured by this class.
 	 */

includes/installer/Installer.i18n.php

@@ -301,6 +301,8 @@ The account you specify here must already exist.',
 
 '''MyISAM''' may be faster in single-user or read-only installations.
 MyISAM databases tend to get corrupted more often than InnoDB databases.",
+	'config-mysql-egine-mismatch'     => "'''Warning:''' you requested the $1 storage engine, but the existing database uses the $2 engine.
+This upgrade script can't convert it, so it will remain $2.",
 	'config-mysql-charset'            => 'Database character set:',
 	'config-mysql-binary'             => 'Binary',
 	'config-mysql-utf8'               => 'UTF-8',
@@ -308,6 +310,8 @@ MyISAM databases tend to get corrupted more often than InnoDB databases.",
 This is more efficient than MySQL's UTF-8 mode, and allows you to use the full range of Unicode characters.
 
 In '''UTF-8 mode''', MySQL will know what character set your data is in, and can present and convert it appropriately, but it will not let you store characters above the [http://en.wikipedia.org/wiki/Mapping_of_Unicode_character_planes Basic Multilingual Plane].",
+	'config-mysql-charset-mismatch'   => "'''Warning:''' you requested the $1 schema, but the existing database has the $2 schema.
+	This upgrade script can't convert it, so it will remain $2.",
 	'config-site-name'                => 'Name of wiki:',
 	'config-site-name-help'           => "This will appear in the title bar of the browser and in various other places.",
 	'config-site-name-blank'          => 'Enter a site name.',

includes/installer/MysqlInstaller.php

@@ -130,13 +130,14 @@ class MysqlInstaller extends DatabaseInstaller {
 		return $status;
 	}
 
-	public function doUpgrade() {
+	public function preUpgrade() {
 		$status = $this->getConnection();
 		if ( !$status->isOK() ) {
 			$this->parent->showStatusError( $status );
 			return;
 		}
 		$conn = $status->value;
+		$conn->selectDB( $this->getVar( 'wgDBname' ) );
 
 		# Determine existing default character set
 		if ( $conn->tableExists( "revision" ) ) {
@@ -164,9 +165,53 @@ class MysqlInstaller extends DatabaseInstaller {
 					$existingEngine = $row->Type;
 				}
 			}
+		} else {
+			$existingSchema = false;
+			$existingEngine = false;
 		}
-		
-		// TODO
+
+		if ( $existingSchema && $existingSchema != $this->getVar( '_MysqlCharset' ) ) {
+			$this->parent->showMessage( 'config-mysql-charset-mismatch', $this->getVar( '_MysqlCharset' ), $existingSchema );
+			$this->setVar( '_MysqlCharset', $existingSchema );
+		}
+		if ( $existingEngine && $existingEngine != $this->getVar( '_MysqlEngine' ) ) {
+			$this->parent->showMessage( 'config-mysql-egine-mismatch', $this->getVar( '_MysqlEngine' ), $existingEngine );
+			$this->setVar( '_MysqlEngine', $existingEngine );
+		}
+	}
+
+	/**
+	 * @todo FIXME: this code is just pure crap for compatibility between
+	 * old and new code.
+	 */
+	public function doUpgrade() {
+		global $wgDatabase, $wgDBuser, $wgDBpassword;
+
+		# Some maintenance scripts like wfGetDB()
+		LBFactory::enableBackend();
+		# For do_all_updates()
+		$wgDatabase = $this->db;
+		# Normal user and password are selected after this step, so for now
+		# just copy these two
+		$wgDBuser = $this->getVar( '_InstallUser' );
+		$wgDBpassword = $this->getVar( '_InstallPassword' );
+
+		$ret = true;
+
+		ob_start( array( __CLASS__, 'outputHandler' ) );
+		try {
+			do_all_updates( false, true );
+		} catch ( MWException $e ) {
+			echo "\nAn error occured:\n";
+			echo $e->getText();
+			$ret = false;
+		}
+		ob_end_flush();
+		return $ret;
+	}
+
+	public static function outputHandler( $string ) {
+		return htmlspecialchars( $string );
 	}
 
 	/**

includes/installer/OracleInstaller.php

@@ -115,5 +115,9 @@ class OracleInstaller extends DatabaseInstaller {
 "# Oracle specific settings
 \$wgDBprefix         = \"{$prefix}\";";
 	}
-	
+
+	public function doUpgrade() {
+		// TODO
+		return false;
+	}
 }

includes/installer/PostgresInstaller.php

@@ -149,4 +149,9 @@ class PostgresInstaller extends DatabaseInstaller {
 \$wgDBmwschema       = \"{$schema}\";
 \$wgDBts2schema      = \"{$ts2}\";";
 	}
+
+	public function doUpgrade() {
+		// TODO
+		return false;
+	}
 }

includes/installer/SqliteInstaller.php

@@ -210,5 +210,4 @@ class SqliteInstaller extends DatabaseInstaller {
 "# SQLite-specific settings
 \$wgSQLiteDataDir    = \"{$dir}\";";
 	}
-	
 }

includes/installer/WebInstallerPage.php

@@ -293,6 +293,7 @@ class WebInstaller_Upgrade extends WebInstallerPage {
 		}
 
 		if ( $this->parent->request->wasPosted() ) {
+			$installer->preUpgrade();
 			$this->addHTML(
 				'<div id="config-spinner" style="display:none;"><img src="../skins/common/images/ajax-loader.gif" /></div>' .
 				'<script>jQuery( "#config-spinner" )[0].style.display = "block";</script>' .