Clear cached app config while waiting for the SCSSCache lock to return

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

lib/private/AllConfig.php

@@ -232,6 +232,16 @@ public function deleteAppValue($appName, $key) {
 		\OC::$server->query(\OC\AppConfig::class)->deleteKey($appName, $key);
 	}
 
+	/**
+	 * Clear all the cached app config values
+	 *
+	 * WARNING: do not use this - this is only for usage with the SCSSCacher to
+	 * clear the memory cache of the app config
+	 */
+	public function clearCachedAppConfig() {
+		\OC::$server->query(\OC\AppConfig::class)->clearCachedConfig();
+	}
+
 	/**
 	 * Removes all keys in appconfig belonging to the app
 	 *

lib/private/AppConfig.php

@@ -344,4 +344,14 @@ protected function loadConfigValues() {
 
 		$this->configLoaded = true;
 	}
+
+	/**
+	 * Clear all the cached app config values
+	 *
+	 * WARNING: do not use this - this is only for usage with the SCSSCacher to
+	 * clear the memory cache of the app config
+	 */
+	public function clearCachedConfig() {
+		$this->configLoaded = false;
+	}
 }

lib/private/Template/SCSSCacher.php

@@ -164,6 +164,7 @@ public function process(string $root, string $file, string $app): bool {
 			$retry = 0;
 			sleep(1);
 			while ($retry < 10) {
+				$this->config->clearCachedAppConfig();
 				if (!$this->variablesChanged() && $this->isCached($fileNameCSS, $app)) {
 					// Inject icons vars css if any
 					$this->lockingCache->remove($lockKey);

lib/public/IConfig.php

@@ -257,4 +257,17 @@ public function deleteAppFromAllUsers($appName);
 	 * @since 8.0.0
 	 */
 	public function getUsersForUserValue($appName, $key, $value);
+
+
+	/**
+	 * Clear all the cached app config values
+	 *
+	 * WARNING: do not use this - this is only for usage with the SCSSCacher to
+	 * clear the memory cache of the app config
+	 *
+	 * @internal
+	 * @since 21.0.0
+	 * @deprecated 21.0.0
+	 */
+	public function clearCachedAppConfig();
 }