nextcloud / server

lib/private/Updater.php

Indentation +528 added lines, -528 removed lines

@@ -58,532 +58,532 @@
  */
 class Updater extends BasicEmitter {
 
-	/** @var ILogger $log */
-	private $log;
-
-	/** @var IConfig */
-	private $config;
-
-	/** @var Checker */
-	private $checker;
-
-	/** @var Installer */
-	private $installer;
-
-	private $logLevelNames = [
-		0 => 'Debug',
-		1 => 'Info',
-		2 => 'Warning',
-		3 => 'Error',
-		4 => 'Fatal',
-	];
-
-	/**
-	 * @param IConfig $config
-	 * @param Checker $checker
-	 * @param ILogger $log
-	 * @param Installer $installer
-	 */
-	public function __construct(IConfig $config,
-								Checker $checker,
-								ILogger $log = null,
-								Installer $installer) {
-		$this->log = $log;
-		$this->config = $config;
-		$this->checker = $checker;
-		$this->installer = $installer;
-	}
-
-	/**
-	 * runs the update actions in maintenance mode, does not upgrade the source files
-	 * except the main .htaccess file
-	 *
-	 * @return bool true if the operation succeeded, false otherwise
-	 */
-	public function upgrade() {
-		$this->emitRepairEvents();
-		$this->logAllEvents();
-
-		$logLevel = $this->config->getSystemValue('loglevel', ILogger::WARN);
-		$this->emit('\OC\Updater', 'setDebugLogLevel', [ $logLevel, $this->logLevelNames[$logLevel] ]);
-		$this->config->setSystemValue('loglevel', ILogger::DEBUG);
-
-		$wasMaintenanceModeEnabled = $this->config->getSystemValueBool('maintenance');
-
-		if (!$wasMaintenanceModeEnabled) {
-			$this->config->setSystemValue('maintenance', true);
-			$this->emit('\OC\Updater', 'maintenanceEnabled');
-		}
-
-		// Clear CAN_INSTALL file if not on git
-		if (\OC_Util::getChannel() !== 'git' && is_file(\OC::$configDir.'/CAN_INSTALL')) {
-			if (!unlink(\OC::$configDir . '/CAN_INSTALL')) {
-				$this->log->error('Could not cleanup CAN_INSTALL from your config folder. Please remove this file manually.');
-			}
-		}
-
-		$installedVersion = $this->config->getSystemValue('version', '0.0.0');
-		$currentVersion = implode('.', \OCP\Util::getVersion());
-
-		$this->log->debug('starting upgrade from ' . $installedVersion . ' to ' . $currentVersion, ['app' => 'core']);
-
-		$success = true;
-		try {
-			$this->doUpgrade($currentVersion, $installedVersion);
-		} catch (HintException $exception) {
-			$this->log->logException($exception, ['app' => 'core']);
-			$this->emit('\OC\Updater', 'failure', [$exception->getMessage() . ': ' .$exception->getHint()]);
-			$success = false;
-		} catch (\Exception $exception) {
-			$this->log->logException($exception, ['app' => 'core']);
-			$this->emit('\OC\Updater', 'failure', [get_class($exception) . ': ' .$exception->getMessage()]);
-			$success = false;
-		}
-
-		$this->emit('\OC\Updater', 'updateEnd', [$success]);
-
-		if (!$wasMaintenanceModeEnabled && $success) {
-			$this->config->setSystemValue('maintenance', false);
-			$this->emit('\OC\Updater', 'maintenanceDisabled');
-		} else {
-			$this->emit('\OC\Updater', 'maintenanceActive');
-		}
-
-		$this->emit('\OC\Updater', 'resetLogLevel', [ $logLevel, $this->logLevelNames[$logLevel] ]);
-		$this->config->setSystemValue('loglevel', $logLevel);
-		$this->config->setSystemValue('installed', true);
-
-		return $success;
-	}
-
-	/**
-	 * Return version from which this version is allowed to upgrade from
-	 *
-	 * @return array allowed previous versions per vendor
-	 */
-	private function getAllowedPreviousVersions() {
-		// this should really be a JSON file
-		require \OC::$SERVERROOT . '/version.php';
-		/** @var array $OC_VersionCanBeUpgradedFrom */
-		return $OC_VersionCanBeUpgradedFrom;
-	}
-
-	/**
-	 * Return vendor from which this version was published
-	 *
-	 * @return string Get the vendor
-	 */
-	private function getVendor() {
-		// this should really be a JSON file
-		require \OC::$SERVERROOT . '/version.php';
-		/** @var string $vendor */
-		return (string) $vendor;
-	}
-
-	/**
-	 * Whether an upgrade to a specified version is possible
-	 * @param string $oldVersion
-	 * @param string $newVersion
-	 * @param array $allowedPreviousVersions
-	 * @return bool
-	 */
-	public function isUpgradePossible($oldVersion, $newVersion, array $allowedPreviousVersions) {
-		$version = explode('.', $oldVersion);
-		$majorMinor = $version[0] . '.' . $version[1];
-
-		$currentVendor = $this->config->getAppValue('core', 'vendor', '');
-
-		// Vendor was not set correctly on install, so we have to white-list known versions
-		if ($currentVendor === '' && (
-			isset($allowedPreviousVersions['owncloud'][$oldVersion]) ||
-			isset($allowedPreviousVersions['owncloud'][$majorMinor])
-		)) {
-			$currentVendor = 'owncloud';
-			$this->config->setAppValue('core', 'vendor', $currentVendor);
-		}
-
-		if ($currentVendor === 'nextcloud') {
-			return isset($allowedPreviousVersions[$currentVendor][$majorMinor])
-				&& (version_compare($oldVersion, $newVersion, '<=') ||
-					$this->config->getSystemValue('debug', false));
-		}
-
-		// Check if the instance can be migrated
-		return isset($allowedPreviousVersions[$currentVendor][$majorMinor]) ||
-			isset($allowedPreviousVersions[$currentVendor][$oldVersion]);
-	}
-
-	/**
-	 * runs the update actions in maintenance mode, does not upgrade the source files
-	 * except the main .htaccess file
-	 *
-	 * @param string $currentVersion current version to upgrade to
-	 * @param string $installedVersion previous version from which to upgrade from
-	 *
-	 * @throws \Exception
-	 */
-	private function doUpgrade($currentVersion, $installedVersion) {
-		// Stop update if the update is over several major versions
-		$allowedPreviousVersions = $this->getAllowedPreviousVersions();
-		if (!$this->isUpgradePossible($installedVersion, $currentVersion, $allowedPreviousVersions)) {
-			throw new \Exception('Updates between multiple major versions and downgrades are unsupported.');
-		}
-
-		// Update .htaccess files
-		try {
-			Setup::updateHtaccess();
-			Setup::protectDataDirectory();
-		} catch (\Exception $e) {
-			throw new \Exception($e->getMessage());
-		}
-
-		// create empty file in data dir, so we can later find
-		// out that this is indeed an ownCloud data directory
-		// (in case it didn't exist before)
-		file_put_contents($this->config->getSystemValue('datadirectory', \OC::$SERVERROOT . '/data') . '/.ocdata', '');
-
-		// pre-upgrade repairs
-		$repair = new Repair(Repair::getBeforeUpgradeRepairSteps(), \OC::$server->getEventDispatcher());
-		$repair->run();
-
-		$this->doCoreUpgrade();
-
-		try {
-			// TODO: replace with the new repair step mechanism https://github.com/owncloud/core/pull/24378
-			Setup::installBackgroundJobs();
-		} catch (\Exception $e) {
-			throw new \Exception($e->getMessage());
-		}
-
-		// update all shipped apps
-		$this->checkAppsRequirements();
-		$this->doAppUpgrade();
-
-		// Update the appfetchers version so it downloads the correct list from the appstore
-		\OC::$server->getAppFetcher()->setVersion($currentVersion);
-
-		// upgrade appstore apps
-		$this->upgradeAppStoreApps(\OC::$server->getAppManager()->getInstalledApps());
-		$autoDisabledApps = \OC::$server->getAppManager()->getAutoDisabledApps();
-		$this->upgradeAppStoreApps($autoDisabledApps, true);
-
-		// install new shipped apps on upgrade
-		$errors = Installer::installShippedApps(true);
-		foreach ($errors as $appId => $exception) {
-			/** @var \Exception $exception */
-			$this->log->logException($exception, ['app' => $appId]);
-			$this->emit('\OC\Updater', 'failure', [$appId . ': ' . $exception->getMessage()]);
-		}
-
-		// post-upgrade repairs
-		$repair = new Repair(Repair::getRepairSteps(), \OC::$server->getEventDispatcher());
-		$repair->run();
-
-		//Invalidate update feed
-		$this->config->setAppValue('core', 'lastupdatedat', 0);
-
-		// Check for code integrity if not disabled
-		if (\OC::$server->getIntegrityCodeChecker()->isCodeCheckEnforced()) {
-			$this->emit('\OC\Updater', 'startCheckCodeIntegrity');
-			$this->checker->runInstanceVerification();
-			$this->emit('\OC\Updater', 'finishedCheckCodeIntegrity');
-		}
-
-		// only set the final version if everything went well
-		$this->config->setSystemValue('version', implode('.', Util::getVersion()));
-		$this->config->setAppValue('core', 'vendor', $this->getVendor());
-	}
-
-	protected function doCoreUpgrade() {
-		$this->emit('\OC\Updater', 'dbUpgradeBefore');
-
-		// execute core migrations
-		$ms = new MigrationService('core', \OC::$server->get(Connection::class));
-		$ms->migrate();
-
-		$this->emit('\OC\Updater', 'dbUpgrade');
-	}
-
-	/**
-	 * upgrades all apps within a major ownCloud upgrade. Also loads "priority"
-	 * (types authentication, filesystem, logging, in that order) afterwards.
-	 *
-	 * @throws NeedsUpdateException
-	 */
-	protected function doAppUpgrade() {
-		$apps = \OC_App::getEnabledApps();
-		$priorityTypes = ['authentication', 'filesystem', 'logging'];
-		$pseudoOtherType = 'other';
-		$stacks = [$pseudoOtherType => []];
-
-		foreach ($apps as $appId) {
-			$priorityType = false;
-			foreach ($priorityTypes as $type) {
-				if (!isset($stacks[$type])) {
-					$stacks[$type] = [];
-				}
-				if (\OC_App::isType($appId, [$type])) {
-					$stacks[$type][] = $appId;
-					$priorityType = true;
-					break;
-				}
-			}
-			if (!$priorityType) {
-				$stacks[$pseudoOtherType][] = $appId;
-			}
-		}
-		foreach (array_merge($priorityTypes, [$pseudoOtherType]) as $type) {
-			$stack = $stacks[$type];
-			foreach ($stack as $appId) {
-				if (\OC_App::shouldUpgrade($appId)) {
-					$this->emit('\OC\Updater', 'appUpgradeStarted', [$appId, \OC_App::getAppVersion($appId)]);
-					\OC_App::updateApp($appId);
-					$this->emit('\OC\Updater', 'appUpgrade', [$appId, \OC_App::getAppVersion($appId)]);
-				}
-				if ($type !== $pseudoOtherType) {
-					// load authentication, filesystem and logging apps after
-					// upgrading them. Other apps my need to rely on modifying
-					// user and/or filesystem aspects.
-					\OC_App::loadApp($appId);
-				}
-			}
-		}
-	}
-
-	/**
-	 * check if the current enabled apps are compatible with the current
-	 * ownCloud version. disable them if not.
-	 * This is important if you upgrade ownCloud and have non ported 3rd
-	 * party apps installed.
-	 *
-	 * @return array
-	 * @throws \Exception
-	 */
-	private function checkAppsRequirements() {
-		$isCoreUpgrade = $this->isCodeUpgrade();
-		$apps = OC_App::getEnabledApps();
-		$version = implode('.', Util::getVersion());
-		$disabledApps = [];
-		$appManager = \OC::$server->getAppManager();
-		foreach ($apps as $app) {
-			// check if the app is compatible with this version of Nextcloud
-			$info = OC_App::getAppInfo($app);
-			if ($info === null || !OC_App::isAppCompatible($version, $info)) {
-				if ($appManager->isShipped($app)) {
-					throw new \UnexpectedValueException('The files of the app "' . $app . '" were not correctly replaced before running the update');
-				}
-				\OC::$server->getAppManager()->disableApp($app, true);
-				$this->emit('\OC\Updater', 'incompatibleAppDisabled', [$app]);
-			}
-			// no need to disable any app in case this is a non-core upgrade
-			if (!$isCoreUpgrade) {
-				continue;
-			}
-			// shipped apps will remain enabled
-			if ($appManager->isShipped($app)) {
-				continue;
-			}
-			// authentication and session apps will remain enabled as well
-			if (OC_App::isType($app, ['session', 'authentication'])) {
-				continue;
-			}
-		}
-		return $disabledApps;
-	}
-
-	/**
-	 * @return bool
-	 */
-	private function isCodeUpgrade() {
-		$installedVersion = $this->config->getSystemValue('version', '0.0.0');
-		$currentVersion = implode('.', Util::getVersion());
-		if (version_compare($currentVersion, $installedVersion, '>')) {
-			return true;
-		}
-		return false;
-	}
-
-	/**
-	 * @param array $disabledApps
-	 * @param bool $reenable
-	 * @throws \Exception
-	 */
-	private function upgradeAppStoreApps(array $disabledApps, $reenable = false) {
-		foreach ($disabledApps as $app) {
-			try {
-				$this->emit('\OC\Updater', 'checkAppStoreAppBefore', [$app]);
-				if ($this->installer->isUpdateAvailable($app)) {
-					$this->emit('\OC\Updater', 'upgradeAppStoreApp', [$app]);
-					$this->installer->updateAppstoreApp($app);
-				}
-				$this->emit('\OC\Updater', 'checkAppStoreApp', [$app]);
-
-				if ($reenable) {
-					$ocApp = new \OC_App();
-					$ocApp->enable($app);
-				}
-			} catch (\Exception $ex) {
-				$this->log->logException($ex, ['app' => 'core']);
-			}
-		}
-	}
-
-	/**
-	 * Forward messages emitted by the repair routine
-	 */
-	private function emitRepairEvents() {
-		$dispatcher = \OC::$server->getEventDispatcher();
-		$dispatcher->addListener('\OC\Repair::warning', function ($event) {
-			if ($event instanceof GenericEvent) {
-				$this->emit('\OC\Updater', 'repairWarning', $event->getArguments());
-			}
-		});
-		$dispatcher->addListener('\OC\Repair::error', function ($event) {
-			if ($event instanceof GenericEvent) {
-				$this->emit('\OC\Updater', 'repairError', $event->getArguments());
-			}
-		});
-		$dispatcher->addListener('\OC\Repair::info', function ($event) {
-			if ($event instanceof GenericEvent) {
-				$this->emit('\OC\Updater', 'repairInfo', $event->getArguments());
-			}
-		});
-		$dispatcher->addListener('\OC\Repair::step', function ($event) {
-			if ($event instanceof GenericEvent) {
-				$this->emit('\OC\Updater', 'repairStep', $event->getArguments());
-			}
-		});
-	}
-
-	private function logAllEvents() {
-		$log = $this->log;
-
-		$dispatcher = \OC::$server->getEventDispatcher();
-		$dispatcher->addListener('\OC\DB\Migrator::executeSql', function ($event) use ($log) {
-			if (!$event instanceof GenericEvent) {
-				return;
-			}
-			$log->info('\OC\DB\Migrator::executeSql: ' . $event->getSubject() . ' (' . $event->getArgument(0) . ' of ' . $event->getArgument(1) . ')', ['app' => 'updater']);
-		});
-		$dispatcher->addListener('\OC\DB\Migrator::checkTable', function ($event) use ($log) {
-			if (!$event instanceof GenericEvent) {
-				return;
-			}
-			$log->info('\OC\DB\Migrator::checkTable: ' . $event->getSubject() . ' (' . $event->getArgument(0) . ' of ' . $event->getArgument(1) . ')', ['app' => 'updater']);
-		});
-
-		$repairListener = function ($event) use ($log) {
-			if (!$event instanceof GenericEvent) {
-				return;
-			}
-			switch ($event->getSubject()) {
-				case '\OC\Repair::startProgress':
-					$log->info('\OC\Repair::startProgress: Starting ... ' . $event->getArgument(1) .  ' (' . $event->getArgument(0) . ')', ['app' => 'updater']);
-					break;
-				case '\OC\Repair::advance':
-					$desc = $event->getArgument(1);
-					if (empty($desc)) {
-						$desc = '';
-					}
-					$log->info('\OC\Repair::advance: ' . $desc . ' (' . $event->getArgument(0) . ')', ['app' => 'updater']);
-
-					break;
-				case '\OC\Repair::finishProgress':
-					$log->info('\OC\Repair::finishProgress', ['app' => 'updater']);
-					break;
-				case '\OC\Repair::step':
-					$log->info('\OC\Repair::step: Repair step: ' . $event->getArgument(0), ['app' => 'updater']);
-					break;
-				case '\OC\Repair::info':
-					$log->info('\OC\Repair::info: Repair info: ' . $event->getArgument(0), ['app' => 'updater']);
-					break;
-				case '\OC\Repair::warning':
-					$log->warning('\OC\Repair::warning: Repair warning: ' . $event->getArgument(0), ['app' => 'updater']);
-					break;
-				case '\OC\Repair::error':
-					$log->error('\OC\Repair::error: Repair error: ' . $event->getArgument(0), ['app' => 'updater']);
-					break;
-			}
-		};
-
-		$dispatcher->addListener('\OC\Repair::startProgress', $repairListener);
-		$dispatcher->addListener('\OC\Repair::advance', $repairListener);
-		$dispatcher->addListener('\OC\Repair::finishProgress', $repairListener);
-		$dispatcher->addListener('\OC\Repair::step', $repairListener);
-		$dispatcher->addListener('\OC\Repair::info', $repairListener);
-		$dispatcher->addListener('\OC\Repair::warning', $repairListener);
-		$dispatcher->addListener('\OC\Repair::error', $repairListener);
-
-
-		$this->listen('\OC\Updater', 'maintenanceEnabled', function () use ($log) {
-			$log->info('\OC\Updater::maintenanceEnabled: Turned on maintenance mode', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'maintenanceDisabled', function () use ($log) {
-			$log->info('\OC\Updater::maintenanceDisabled: Turned off maintenance mode', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'maintenanceActive', function () use ($log) {
-			$log->info('\OC\Updater::maintenanceActive: Maintenance mode is kept active', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'updateEnd', function ($success) use ($log) {
-			if ($success) {
-				$log->info('\OC\Updater::updateEnd: Update successful', ['app' => 'updater']);
-			} else {
-				$log->error('\OC\Updater::updateEnd: Update failed', ['app' => 'updater']);
-			}
-		});
-		$this->listen('\OC\Updater', 'dbUpgradeBefore', function () use ($log) {
-			$log->info('\OC\Updater::dbUpgradeBefore: Updating database schema', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'dbUpgrade', function () use ($log) {
-			$log->info('\OC\Updater::dbUpgrade: Updated database', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'dbSimulateUpgradeBefore', function () use ($log) {
-			$log->info('\OC\Updater::dbSimulateUpgradeBefore: Checking whether the database schema can be updated (this can take a long time depending on the database size)', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'dbSimulateUpgrade', function () use ($log) {
-			$log->info('\OC\Updater::dbSimulateUpgrade: Checked database schema update', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'incompatibleAppDisabled', function ($app) use ($log) {
-			$log->info('\OC\Updater::incompatibleAppDisabled: Disabled incompatible app: ' . $app, ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'checkAppStoreAppBefore', function ($app) use ($log) {
-			$log->info('\OC\Updater::checkAppStoreAppBefore: Checking for update of app "' . $app . '" in appstore', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'upgradeAppStoreApp', function ($app) use ($log) {
-			$log->info('\OC\Updater::upgradeAppStoreApp: Update app "' . $app . '" from appstore', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'checkAppStoreApp', function ($app) use ($log) {
-			$log->info('\OC\Updater::checkAppStoreApp: Checked for update of app "' . $app . '" in appstore', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'appUpgradeCheckBefore', function () use ($log) {
-			$log->info('\OC\Updater::appUpgradeCheckBefore: Checking updates of apps', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'appSimulateUpdate', function ($app) use ($log) {
-			$log->info('\OC\Updater::appSimulateUpdate: Checking whether the database schema for <' . $app . '> can be updated (this can take a long time depending on the database size)', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'appUpgradeCheck', function () use ($log) {
-			$log->info('\OC\Updater::appUpgradeCheck: Checked database schema update for apps', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'appUpgradeStarted', function ($app) use ($log) {
-			$log->info('\OC\Updater::appUpgradeStarted: Updating <' . $app . '> ...', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'appUpgrade', function ($app, $version) use ($log) {
-			$log->info('\OC\Updater::appUpgrade: Updated <' . $app . '> to ' . $version, ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'failure', function ($message) use ($log) {
-			$log->error('\OC\Updater::failure: ' . $message, ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'setDebugLogLevel', function () use ($log) {
-			$log->info('\OC\Updater::setDebugLogLevel: Set log level to debug', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'resetLogLevel', function ($logLevel, $logLevelName) use ($log) {
-			$log->info('\OC\Updater::resetLogLevel: Reset log level to ' . $logLevelName . '(' . $logLevel . ')', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'startCheckCodeIntegrity', function () use ($log) {
-			$log->info('\OC\Updater::startCheckCodeIntegrity: Starting code integrity check...', ['app' => 'updater']);
-		});
-		$this->listen('\OC\Updater', 'finishedCheckCodeIntegrity', function () use ($log) {
-			$log->info('\OC\Updater::finishedCheckCodeIntegrity: Finished code integrity check', ['app' => 'updater']);
-		});
-	}
+    /** @var ILogger $log */
+    private $log;
+
+    /** @var IConfig */
+    private $config;
+
+    /** @var Checker */
+    private $checker;
+
+    /** @var Installer */
+    private $installer;
+
+    private $logLevelNames = [
+        0 => 'Debug',
+        1 => 'Info',
+        2 => 'Warning',
+        3 => 'Error',
+        4 => 'Fatal',
+    ];
+
+    /**
+     * @param IConfig $config
+     * @param Checker $checker
+     * @param ILogger $log
+     * @param Installer $installer
+     */
+    public function __construct(IConfig $config,
+                                Checker $checker,
+                                ILogger $log = null,
+                                Installer $installer) {
+        $this->log = $log;
+        $this->config = $config;
+        $this->checker = $checker;
+        $this->installer = $installer;
+    }
+
+    /**
+     * runs the update actions in maintenance mode, does not upgrade the source files
+     * except the main .htaccess file
+     *
+     * @return bool true if the operation succeeded, false otherwise
+     */
+    public function upgrade() {
+        $this->emitRepairEvents();
+        $this->logAllEvents();
+
+        $logLevel = $this->config->getSystemValue('loglevel', ILogger::WARN);
+        $this->emit('\OC\Updater', 'setDebugLogLevel', [ $logLevel, $this->logLevelNames[$logLevel] ]);
+        $this->config->setSystemValue('loglevel', ILogger::DEBUG);
+
+        $wasMaintenanceModeEnabled = $this->config->getSystemValueBool('maintenance');
+
+        if (!$wasMaintenanceModeEnabled) {
+            $this->config->setSystemValue('maintenance', true);
+            $this->emit('\OC\Updater', 'maintenanceEnabled');
+        }
+
+        // Clear CAN_INSTALL file if not on git
+        if (\OC_Util::getChannel() !== 'git' && is_file(\OC::$configDir.'/CAN_INSTALL')) {
+            if (!unlink(\OC::$configDir . '/CAN_INSTALL')) {
+                $this->log->error('Could not cleanup CAN_INSTALL from your config folder. Please remove this file manually.');
+            }
+        }
+
+        $installedVersion = $this->config->getSystemValue('version', '0.0.0');
+        $currentVersion = implode('.', \OCP\Util::getVersion());
+
+        $this->log->debug('starting upgrade from ' . $installedVersion . ' to ' . $currentVersion, ['app' => 'core']);
+
+        $success = true;
+        try {
+            $this->doUpgrade($currentVersion, $installedVersion);
+        } catch (HintException $exception) {
+            $this->log->logException($exception, ['app' => 'core']);
+            $this->emit('\OC\Updater', 'failure', [$exception->getMessage() . ': ' .$exception->getHint()]);
+            $success = false;
+        } catch (\Exception $exception) {
+            $this->log->logException($exception, ['app' => 'core']);
+            $this->emit('\OC\Updater', 'failure', [get_class($exception) . ': ' .$exception->getMessage()]);
+            $success = false;
+        }
+
+        $this->emit('\OC\Updater', 'updateEnd', [$success]);
+
+        if (!$wasMaintenanceModeEnabled && $success) {
+            $this->config->setSystemValue('maintenance', false);
+            $this->emit('\OC\Updater', 'maintenanceDisabled');
+        } else {
+            $this->emit('\OC\Updater', 'maintenanceActive');
+        }
+
+        $this->emit('\OC\Updater', 'resetLogLevel', [ $logLevel, $this->logLevelNames[$logLevel] ]);
+        $this->config->setSystemValue('loglevel', $logLevel);
+        $this->config->setSystemValue('installed', true);
+
+        return $success;
+    }
+
+    /**
+     * Return version from which this version is allowed to upgrade from
+     *
+     * @return array allowed previous versions per vendor
+     */
+    private function getAllowedPreviousVersions() {
+        // this should really be a JSON file
+        require \OC::$SERVERROOT . '/version.php';
+        /** @var array $OC_VersionCanBeUpgradedFrom */
+        return $OC_VersionCanBeUpgradedFrom;
+    }
+
+    /**
+     * Return vendor from which this version was published
+     *
+     * @return string Get the vendor
+     */
+    private function getVendor() {
+        // this should really be a JSON file
+        require \OC::$SERVERROOT . '/version.php';
+        /** @var string $vendor */
+        return (string) $vendor;
+    }
+
+    /**
+     * Whether an upgrade to a specified version is possible
+     * @param string $oldVersion
+     * @param string $newVersion
+     * @param array $allowedPreviousVersions
+     * @return bool
+     */
+    public function isUpgradePossible($oldVersion, $newVersion, array $allowedPreviousVersions) {
+        $version = explode('.', $oldVersion);
+        $majorMinor = $version[0] . '.' . $version[1];
+
+        $currentVendor = $this->config->getAppValue('core', 'vendor', '');
+
+        // Vendor was not set correctly on install, so we have to white-list known versions
+        if ($currentVendor === '' && (
+            isset($allowedPreviousVersions['owncloud'][$oldVersion]) ||
+            isset($allowedPreviousVersions['owncloud'][$majorMinor])
+        )) {
+            $currentVendor = 'owncloud';
+            $this->config->setAppValue('core', 'vendor', $currentVendor);
+        }
+
+        if ($currentVendor === 'nextcloud') {
+            return isset($allowedPreviousVersions[$currentVendor][$majorMinor])
+                && (version_compare($oldVersion, $newVersion, '<=') ||
+                    $this->config->getSystemValue('debug', false));
+        }
+
+        // Check if the instance can be migrated
+        return isset($allowedPreviousVersions[$currentVendor][$majorMinor]) ||
+            isset($allowedPreviousVersions[$currentVendor][$oldVersion]);
+    }
+
+    /**
+     * runs the update actions in maintenance mode, does not upgrade the source files
+     * except the main .htaccess file
+     *
+     * @param string $currentVersion current version to upgrade to
+     * @param string $installedVersion previous version from which to upgrade from
+     *
+     * @throws \Exception
+     */
+    private function doUpgrade($currentVersion, $installedVersion) {
+        // Stop update if the update is over several major versions
+        $allowedPreviousVersions = $this->getAllowedPreviousVersions();
+        if (!$this->isUpgradePossible($installedVersion, $currentVersion, $allowedPreviousVersions)) {
+            throw new \Exception('Updates between multiple major versions and downgrades are unsupported.');
+        }
+
+        // Update .htaccess files
+        try {
+            Setup::updateHtaccess();
+            Setup::protectDataDirectory();
+        } catch (\Exception $e) {
+            throw new \Exception($e->getMessage());
+        }
+
+        // create empty file in data dir, so we can later find
+        // out that this is indeed an ownCloud data directory
+        // (in case it didn't exist before)
+        file_put_contents($this->config->getSystemValue('datadirectory', \OC::$SERVERROOT . '/data') . '/.ocdata', '');
+
+        // pre-upgrade repairs
+        $repair = new Repair(Repair::getBeforeUpgradeRepairSteps(), \OC::$server->getEventDispatcher());
+        $repair->run();
+
+        $this->doCoreUpgrade();
+
+        try {
+            // TODO: replace with the new repair step mechanism https://github.com/owncloud/core/pull/24378
+            Setup::installBackgroundJobs();
+        } catch (\Exception $e) {
+            throw new \Exception($e->getMessage());
+        }
+
+        // update all shipped apps
+        $this->checkAppsRequirements();
+        $this->doAppUpgrade();
+
+        // Update the appfetchers version so it downloads the correct list from the appstore
+        \OC::$server->getAppFetcher()->setVersion($currentVersion);
+
+        // upgrade appstore apps
+        $this->upgradeAppStoreApps(\OC::$server->getAppManager()->getInstalledApps());
+        $autoDisabledApps = \OC::$server->getAppManager()->getAutoDisabledApps();
+        $this->upgradeAppStoreApps($autoDisabledApps, true);
+
+        // install new shipped apps on upgrade
+        $errors = Installer::installShippedApps(true);
+        foreach ($errors as $appId => $exception) {
+            /** @var \Exception $exception */
+            $this->log->logException($exception, ['app' => $appId]);
+            $this->emit('\OC\Updater', 'failure', [$appId . ': ' . $exception->getMessage()]);
+        }
+
+        // post-upgrade repairs
+        $repair = new Repair(Repair::getRepairSteps(), \OC::$server->getEventDispatcher());
+        $repair->run();
+
+        //Invalidate update feed
+        $this->config->setAppValue('core', 'lastupdatedat', 0);
+
+        // Check for code integrity if not disabled
+        if (\OC::$server->getIntegrityCodeChecker()->isCodeCheckEnforced()) {
+            $this->emit('\OC\Updater', 'startCheckCodeIntegrity');
+            $this->checker->runInstanceVerification();
+            $this->emit('\OC\Updater', 'finishedCheckCodeIntegrity');
+        }
+
+        // only set the final version if everything went well
+        $this->config->setSystemValue('version', implode('.', Util::getVersion()));
+        $this->config->setAppValue('core', 'vendor', $this->getVendor());
+    }
+
+    protected function doCoreUpgrade() {
+        $this->emit('\OC\Updater', 'dbUpgradeBefore');
+
+        // execute core migrations
+        $ms = new MigrationService('core', \OC::$server->get(Connection::class));
+        $ms->migrate();
+
+        $this->emit('\OC\Updater', 'dbUpgrade');
+    }
+
+    /**
+     * upgrades all apps within a major ownCloud upgrade. Also loads "priority"
+     * (types authentication, filesystem, logging, in that order) afterwards.
+     *
+     * @throws NeedsUpdateException
+     */
+    protected function doAppUpgrade() {
+        $apps = \OC_App::getEnabledApps();
+        $priorityTypes = ['authentication', 'filesystem', 'logging'];
+        $pseudoOtherType = 'other';
+        $stacks = [$pseudoOtherType => []];
+
+        foreach ($apps as $appId) {
+            $priorityType = false;
+            foreach ($priorityTypes as $type) {
+                if (!isset($stacks[$type])) {
+                    $stacks[$type] = [];
+                }
+                if (\OC_App::isType($appId, [$type])) {
+                    $stacks[$type][] = $appId;
+                    $priorityType = true;
+                    break;
+                }
+            }
+            if (!$priorityType) {
+                $stacks[$pseudoOtherType][] = $appId;
+            }
+        }
+        foreach (array_merge($priorityTypes, [$pseudoOtherType]) as $type) {
+            $stack = $stacks[$type];
+            foreach ($stack as $appId) {
+                if (\OC_App::shouldUpgrade($appId)) {
+                    $this->emit('\OC\Updater', 'appUpgradeStarted', [$appId, \OC_App::getAppVersion($appId)]);
+                    \OC_App::updateApp($appId);
+                    $this->emit('\OC\Updater', 'appUpgrade', [$appId, \OC_App::getAppVersion($appId)]);
+                }
+                if ($type !== $pseudoOtherType) {
+                    // load authentication, filesystem and logging apps after
+                    // upgrading them. Other apps my need to rely on modifying
+                    // user and/or filesystem aspects.
+                    \OC_App::loadApp($appId);
+                }
+            }
+        }
+    }
+
+    /**
+     * check if the current enabled apps are compatible with the current
+     * ownCloud version. disable them if not.
+     * This is important if you upgrade ownCloud and have non ported 3rd
+     * party apps installed.
+     *
+     * @return array
+     * @throws \Exception
+     */
+    private function checkAppsRequirements() {
+        $isCoreUpgrade = $this->isCodeUpgrade();
+        $apps = OC_App::getEnabledApps();
+        $version = implode('.', Util::getVersion());
+        $disabledApps = [];
+        $appManager = \OC::$server->getAppManager();
+        foreach ($apps as $app) {
+            // check if the app is compatible with this version of Nextcloud
+            $info = OC_App::getAppInfo($app);
+            if ($info === null || !OC_App::isAppCompatible($version, $info)) {
+                if ($appManager->isShipped($app)) {
+                    throw new \UnexpectedValueException('The files of the app "' . $app . '" were not correctly replaced before running the update');
+                }
+                \OC::$server->getAppManager()->disableApp($app, true);
+                $this->emit('\OC\Updater', 'incompatibleAppDisabled', [$app]);
+            }
+            // no need to disable any app in case this is a non-core upgrade
+            if (!$isCoreUpgrade) {
+                continue;
+            }
+            // shipped apps will remain enabled
+            if ($appManager->isShipped($app)) {
+                continue;
+            }
+            // authentication and session apps will remain enabled as well
+            if (OC_App::isType($app, ['session', 'authentication'])) {
+                continue;
+            }
+        }
+        return $disabledApps;
+    }
+
+    /**
+     * @return bool
+     */
+    private function isCodeUpgrade() {
+        $installedVersion = $this->config->getSystemValue('version', '0.0.0');
+        $currentVersion = implode('.', Util::getVersion());
+        if (version_compare($currentVersion, $installedVersion, '>')) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * @param array $disabledApps
+     * @param bool $reenable
+     * @throws \Exception
+     */
+    private function upgradeAppStoreApps(array $disabledApps, $reenable = false) {
+        foreach ($disabledApps as $app) {
+            try {
+                $this->emit('\OC\Updater', 'checkAppStoreAppBefore', [$app]);
+                if ($this->installer->isUpdateAvailable($app)) {
+                    $this->emit('\OC\Updater', 'upgradeAppStoreApp', [$app]);
+                    $this->installer->updateAppstoreApp($app);
+                }
+                $this->emit('\OC\Updater', 'checkAppStoreApp', [$app]);
+
+                if ($reenable) {
+                    $ocApp = new \OC_App();
+                    $ocApp->enable($app);
+                }
+            } catch (\Exception $ex) {
+                $this->log->logException($ex, ['app' => 'core']);
+            }
+        }
+    }
+
+    /**
+     * Forward messages emitted by the repair routine
+     */
+    private function emitRepairEvents() {
+        $dispatcher = \OC::$server->getEventDispatcher();
+        $dispatcher->addListener('\OC\Repair::warning', function ($event) {
+            if ($event instanceof GenericEvent) {
+                $this->emit('\OC\Updater', 'repairWarning', $event->getArguments());
+            }
+        });
+        $dispatcher->addListener('\OC\Repair::error', function ($event) {
+            if ($event instanceof GenericEvent) {
+                $this->emit('\OC\Updater', 'repairError', $event->getArguments());
+            }
+        });
+        $dispatcher->addListener('\OC\Repair::info', function ($event) {
+            if ($event instanceof GenericEvent) {
+                $this->emit('\OC\Updater', 'repairInfo', $event->getArguments());
+            }
+        });
+        $dispatcher->addListener('\OC\Repair::step', function ($event) {
+            if ($event instanceof GenericEvent) {
+                $this->emit('\OC\Updater', 'repairStep', $event->getArguments());
+            }
+        });
+    }
+
+    private function logAllEvents() {
+        $log = $this->log;
+
+        $dispatcher = \OC::$server->getEventDispatcher();
+        $dispatcher->addListener('\OC\DB\Migrator::executeSql', function ($event) use ($log) {
+            if (!$event instanceof GenericEvent) {
+                return;
+            }
+            $log->info('\OC\DB\Migrator::executeSql: ' . $event->getSubject() . ' (' . $event->getArgument(0) . ' of ' . $event->getArgument(1) . ')', ['app' => 'updater']);
+        });
+        $dispatcher->addListener('\OC\DB\Migrator::checkTable', function ($event) use ($log) {
+            if (!$event instanceof GenericEvent) {
+                return;
+            }
+            $log->info('\OC\DB\Migrator::checkTable: ' . $event->getSubject() . ' (' . $event->getArgument(0) . ' of ' . $event->getArgument(1) . ')', ['app' => 'updater']);
+        });
+
+        $repairListener = function ($event) use ($log) {
+            if (!$event instanceof GenericEvent) {
+                return;
+            }
+            switch ($event->getSubject()) {
+                case '\OC\Repair::startProgress':
+                    $log->info('\OC\Repair::startProgress: Starting ... ' . $event->getArgument(1) .  ' (' . $event->getArgument(0) . ')', ['app' => 'updater']);
+                    break;
+                case '\OC\Repair::advance':
+                    $desc = $event->getArgument(1);
+                    if (empty($desc)) {
+                        $desc = '';
+                    }
+                    $log->info('\OC\Repair::advance: ' . $desc . ' (' . $event->getArgument(0) . ')', ['app' => 'updater']);
+
+                    break;
+                case '\OC\Repair::finishProgress':
+                    $log->info('\OC\Repair::finishProgress', ['app' => 'updater']);
+                    break;
+                case '\OC\Repair::step':
+                    $log->info('\OC\Repair::step: Repair step: ' . $event->getArgument(0), ['app' => 'updater']);
+                    break;
+                case '\OC\Repair::info':
+                    $log->info('\OC\Repair::info: Repair info: ' . $event->getArgument(0), ['app' => 'updater']);
+                    break;
+                case '\OC\Repair::warning':
+                    $log->warning('\OC\Repair::warning: Repair warning: ' . $event->getArgument(0), ['app' => 'updater']);
+                    break;
+                case '\OC\Repair::error':
+                    $log->error('\OC\Repair::error: Repair error: ' . $event->getArgument(0), ['app' => 'updater']);
+                    break;
+            }
+        };
+
+        $dispatcher->addListener('\OC\Repair::startProgress', $repairListener);
+        $dispatcher->addListener('\OC\Repair::advance', $repairListener);
+        $dispatcher->addListener('\OC\Repair::finishProgress', $repairListener);
+        $dispatcher->addListener('\OC\Repair::step', $repairListener);
+        $dispatcher->addListener('\OC\Repair::info', $repairListener);
+        $dispatcher->addListener('\OC\Repair::warning', $repairListener);
+        $dispatcher->addListener('\OC\Repair::error', $repairListener);
+
+
+        $this->listen('\OC\Updater', 'maintenanceEnabled', function () use ($log) {
+            $log->info('\OC\Updater::maintenanceEnabled: Turned on maintenance mode', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'maintenanceDisabled', function () use ($log) {
+            $log->info('\OC\Updater::maintenanceDisabled: Turned off maintenance mode', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'maintenanceActive', function () use ($log) {
+            $log->info('\OC\Updater::maintenanceActive: Maintenance mode is kept active', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'updateEnd', function ($success) use ($log) {
+            if ($success) {
+                $log->info('\OC\Updater::updateEnd: Update successful', ['app' => 'updater']);
+            } else {
+                $log->error('\OC\Updater::updateEnd: Update failed', ['app' => 'updater']);
+            }
+        });
+        $this->listen('\OC\Updater', 'dbUpgradeBefore', function () use ($log) {
+            $log->info('\OC\Updater::dbUpgradeBefore: Updating database schema', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'dbUpgrade', function () use ($log) {
+            $log->info('\OC\Updater::dbUpgrade: Updated database', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'dbSimulateUpgradeBefore', function () use ($log) {
+            $log->info('\OC\Updater::dbSimulateUpgradeBefore: Checking whether the database schema can be updated (this can take a long time depending on the database size)', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'dbSimulateUpgrade', function () use ($log) {
+            $log->info('\OC\Updater::dbSimulateUpgrade: Checked database schema update', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'incompatibleAppDisabled', function ($app) use ($log) {
+            $log->info('\OC\Updater::incompatibleAppDisabled: Disabled incompatible app: ' . $app, ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'checkAppStoreAppBefore', function ($app) use ($log) {
+            $log->info('\OC\Updater::checkAppStoreAppBefore: Checking for update of app "' . $app . '" in appstore', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'upgradeAppStoreApp', function ($app) use ($log) {
+            $log->info('\OC\Updater::upgradeAppStoreApp: Update app "' . $app . '" from appstore', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'checkAppStoreApp', function ($app) use ($log) {
+            $log->info('\OC\Updater::checkAppStoreApp: Checked for update of app "' . $app . '" in appstore', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'appUpgradeCheckBefore', function () use ($log) {
+            $log->info('\OC\Updater::appUpgradeCheckBefore: Checking updates of apps', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'appSimulateUpdate', function ($app) use ($log) {
+            $log->info('\OC\Updater::appSimulateUpdate: Checking whether the database schema for <' . $app . '> can be updated (this can take a long time depending on the database size)', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'appUpgradeCheck', function () use ($log) {
+            $log->info('\OC\Updater::appUpgradeCheck: Checked database schema update for apps', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'appUpgradeStarted', function ($app) use ($log) {
+            $log->info('\OC\Updater::appUpgradeStarted: Updating <' . $app . '> ...', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'appUpgrade', function ($app, $version) use ($log) {
+            $log->info('\OC\Updater::appUpgrade: Updated <' . $app . '> to ' . $version, ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'failure', function ($message) use ($log) {
+            $log->error('\OC\Updater::failure: ' . $message, ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'setDebugLogLevel', function () use ($log) {
+            $log->info('\OC\Updater::setDebugLogLevel: Set log level to debug', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'resetLogLevel', function ($logLevel, $logLevelName) use ($log) {
+            $log->info('\OC\Updater::resetLogLevel: Reset log level to ' . $logLevelName . '(' . $logLevel . ')', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'startCheckCodeIntegrity', function () use ($log) {
+            $log->info('\OC\Updater::startCheckCodeIntegrity: Starting code integrity check...', ['app' => 'updater']);
+        });
+        $this->listen('\OC\Updater', 'finishedCheckCodeIntegrity', function () use ($log) {
+            $log->info('\OC\Updater::finishedCheckCodeIntegrity: Finished code integrity check', ['app' => 'updater']);
+        });
+    }
 }