Merge pull request #8210 from owncloud/enhance-assets-management-master

adding checks and log messages regarding the assets folder

lib/private/templatelayout.php

@@ -66,7 +66,7 @@ class OC_TemplateLayout extends OC_Template {
 		}
 
 		$versionParameter = '?v=' . md5(implode(OC_Util::getVersion()));
-		$useAssetPipeline = OC_Config::getValue('asset-pipeline.enabled', false);
+		$useAssetPipeline = $this->isAssetPipelineEnabled();
 		if ($useAssetPipeline) {
 
 			$this->append( 'jsfiles', OC_Helper::linkToRoute('js_config') . $versionParameter);
@@ -179,4 +179,33 @@ class OC_TemplateLayout extends OC_Template {
 		sort($files);
 		return hash('md5', implode('', $files));
 	}
+
+	/**
+	 * @return bool
+	 */
+	private function isAssetPipelineEnabled() {
+		// asset management enabled?
+		$useAssetPipeline = OC_Config::getValue('asset-pipeline.enabled', false);
+		if (!$useAssetPipeline) {
+			return false;
+		}
+
+		// assets folder exists?
+		$assetDir = \OC::$SERVERROOT . '/assets';
+		if (!is_dir($assetDir)) {
+			if (!mkdir($assetDir)) {
+				\OCP\Util::writeLog('assets',
+					"Folder <$assetDir> does not exist and/or could not be generated.", \OCP\Util::ERROR);
+				return false;
+			}
+		}
+
+		// assets folder can be accessed?
+		if (!touch($assetDir."/.oc")) {
+			\OCP\Util::writeLog('assets',
+				"Folder <$assetDir> could not be accessed.", \OCP\Util::ERROR);
+			return false;
+		}
+		return $useAssetPipeline;
+	}
 }