From b7fce2493c3b980f1aa4ee4323626657d4596e5a Mon Sep 17 00:00:00 2001
From: Olav Morken <olav.morken@uninett.no>
Date: Fri, 11 Sep 2009 11:59:08 +0000
Subject: [PATCH] SimpleSAML_Utilities: Add writeFile(), for atomically
creating a file.
git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1754 44740490-163a-0410-bde0-09ae8108e29a
---
lib/SimpleSAML/Utilities.php | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/lib/SimpleSAML/Utilities.php b/lib/SimpleSAML/Utilities.php
index d2a0c1e07..95a9db9a1 100644
--- a/lib/SimpleSAML/Utilities.php
+++ b/lib/SimpleSAML/Utilities.php
@@ -1995,6 +1995,38 @@ class SimpleSAML_Utilities {
/* 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());
+ }
+ }
+
}
?>
\ No newline at end of file
--
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