Revision: 1754
Author: olavmrk
Date: Fri Sep 11 04:59:08 2009
Log: SimpleSAML_Utilities: Add writeFile(), for atomically creating a file.
http://code.google.com/p/simplesamlphp/source/detail?r=1754
Modified:
/trunk/lib/SimpleSAML/Utilities.php
=======================================
--- /trunk/lib/SimpleSAML/Utilities.php Tue Sep 1 03:59:16 2009
+++ /trunk/lib/SimpleSAML/Utilities.php Fri Sep 11 04:59:08 2009
@@ -1995,6 +1995,38 @@
/* Set the timezone to the default. */
date_default_timezone_set($serverTimezone);
}
+
+
+ /**
+ * Atomically write a file.
+ *
+ * This is a helper function for safely writing file data atomically.
+ * It does this by writing the file data to a temporary file, and then
+ * renaming this to the correct name.
+ *
+ * @param string $filename The name of the file.
+ * @param string $data The data we should write to the file.
+ */
+ public static function writeFile($filename, $data) {
+ assert('is_string($filename)');
+ assert('is_string($data)');
+
+ $tmpFile = $filename . '.new.' . getmypid() . '.' .
php_uname('n');
+
+ $res = file_put_contents($tmpFile, $data);
+ if ($res === FALSE) {
+ throw new SimpleSAML_Error_Exception('Error saving file
' . $tmpFile .
+ ': ' . SimpleSAML_Utilities::getLastError());
+ }
+
+ $res = rename($tmpFile, $filename);
+ if ($res === FALSE) {
+ unlink($tmpFile);
+ throw new SimpleSAML_Error_Exception('Error renaming '
. $tmpFile . '
to ' .
+ $filename . ': ' .
SimpleSAML_Utilities::getLastError());
+ }
+ }
+
}
?>
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