Making FileEngine emit errors when a path does not exist but is used …

…for caching. Should make cryptic errors coming from Cache easier to figure out. Removed useless private property.

Tests added.
Fixes #384

cake/libs/cache/file.php

@@ -19,6 +19,9 @@
  * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
  */
 
+if (!class_exists('File')) {
+	require LIBS . 'file.php';
+}
 /**
  * File Storage engine for cache
  *
@@ -50,14 +53,6 @@ class FileEngine extends CacheEngine {
  */
 	var $settings = array();
 
-/**
- * Set to true if FileEngine::init(); and FileEngine::__active(); do not fail.
- *
- * @var boolean
- * @access private
- */
-	var $__active = false;
-
 /**
  * True unless FileEngine::__active(); fails
  *
@@ -85,19 +80,16 @@ function init($settings = array()) {
 			$settings
 		));
 		if (!isset($this->__File)) {
-			if (!class_exists('File')) {
-				require LIBS . 'file.php';
-			}
 			$this->__File =& new File($this->settings['path'] . DS . 'cake');
 		}
 
 		if (DIRECTORY_SEPARATOR === '\\') {
 			$this->settings['isWindows'] = true;
 		}
 
-		$this->settings['path'] = $this->__File->Folder->cd($this->settings['path']);
-		if (empty($this->settings['path'])) {
-			return false;
+		$path = $this->__File->Folder->cd($this->settings['path']);
+		if ($path) {
+			$this->settings['path'] = $path;
 		}
 		return $this->__active();
 	}
@@ -266,11 +258,9 @@ function __setKey($key) {
  * @access private
  */
 	function __active() {
-		if (!$this->__active && $this->__init && !is_writable($this->settings['path'])) {
+		if ($this->__init && !is_writable($this->settings['path'])) {
 			$this->__init = false;
 			trigger_error(sprintf(__('%s is not writable', true), $this->settings['path']), E_USER_WARNING);
-		} else {
-			$this->__active = true;
 		}
 		return true;
 	}

cake/tests/cases/libs/cache/file.test.php

@@ -355,5 +355,23 @@ function testWriteQuotedString() {
 		Cache::write('App.singleQuoteTest', "'this is a quoted string'");
 		$this->assertIdentical(Cache::read('App.singleQuoteTest'), "'this is a quoted string'");
 	}
+
+/**
+ * check that FileEngine generates an error when a configured Path does not exist.
+ *
+ * @return void
+ */
+	function testErrorWhenPathDoesNotExist() {
+		if ($this->skipIf(is_dir(TMP . 'tests' . DS . 'file_failure'), 'Cannot run test directory exists. %s')) {
+			return;
+		}
+		$this->expectError();
+		Cache::config('failure', array(
+			'engine' => 'File',
+			'path' => TMP . 'tests' . DS . 'file_failure'
+		));
+
+		Cache::drop('failure');
+	}
 }
 ?>