X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FCore%2FSystem.php;h=f0ed08357359f5cc75f1d3a77652085e35ca657e;hb=f68b3c7c4ec9c7c98054035957db178d5071542c;hp=81c537169e2125f015dd9861ae25af0e5afb32b1;hpb=cb3f09ae4f344ff83fca9dc435f3cbad1972737f;p=friendica.git

diff --git a/src/Core/System.php b/src/Core/System.php
index 81c537169e..f0ed083573 100644
--- a/src/Core/System.php
+++ b/src/Core/System.php
@@ -59,7 +59,6 @@ class System extends BaseObject
 		array_shift($trace);
 
 		$callstack = [];
-		$counter = 0;
 		$previous = ['class' => '', 'function' => ''];
 
 		// The ignore list contains all functions that are only wrapper functions
@@ -287,6 +286,61 @@ class System extends BaseObject
 		exit();
 	}
 
+	/**
+	 * @brief Returns the system user that is executing the script
+	 *
+	 * This mostly returns something like "www-data".
+	 *
+	 * @return string system username
+	 */
+	public static function getUser()
+	{
+		if (!function_exists('posix_getpwuid') || !function_exists('posix_geteuid')) {
+			return '';
+		}
+
+		$processUser = posix_getpwuid(posix_geteuid());
+		return $processUser['name'];
+	}
+
+	/**
+	 * @brief Checks if a given directory is usable for the system
+	 *
+	 * @param      $directory
+	 * @param bool $check_writable
+	 *
+	 * @return boolean the directory is usable
+	 */
+	public static function isDirectoryUsable($directory, $check_writable = true)
+	{
+		if ($directory == '') {
+			Logger::log('Directory is empty. This shouldn\'t happen.', Logger::DEBUG);
+			return false;
+		}
+
+		if (!file_exists($directory)) {
+			Logger::log('Path "' . $directory . '" does not exist for user ' . static::getUser(), Logger::DEBUG);
+			return false;
+		}
+
+		if (is_file($directory)) {
+			Logger::log('Path "' . $directory . '" is a file for user ' . static::getUser(), Logger::DEBUG);
+			return false;
+		}
+
+		if (!is_dir($directory)) {
+			Logger::log('Path "' . $directory . '" is not a directory for user ' . static::getUser(), Logger::DEBUG);
+			return false;
+		}
+
+		if ($check_writable && !is_writable($directory)) {
+			Logger::log('Path "' . $directory . '" is not writable for user ' . static::getUser(), Logger::DEBUG);
+			return false;
+		}
+
+		return true;
+	}
+
 	/// @todo Move the following functions from boot.php
 	/*
 	function killme()