#32160 [Csd->Opn]: Copying a file into itself leads to data loss

From: Date: Wed, 30 Mar 2005 08:23:03 +0000
Subject: #32160 [Csd->Opn]: Copying a file into itself leads to data loss
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-76042@lists.php.net to get a copy of this message 
 ID:               32160
 Updated by:       sniper@php.net
 Reported By:      chernyshevsky at hotmail dot com
-Status:           Closed
+Status:           Open
 Bug Type:         Filesystem function related
 Operating System: *
-PHP Version:      4CVS, 5CVS (2005-03-03)
+PHP Version:      4CVS, 5CVS (2005-03-29)
 New Comment:

The patch was reverted -> re-opened.



Previous Comments:
------------------------------------------------------------------------

[2005-03-03 04:32:05] iliaa@php.net

This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.



------------------------------------------------------------------------

[2005-03-02 03:20:26] chernyshevsky at hotmail dot com

Description:
------------
Copying a file into itself causes the source file to be truncate to 0
bytes.

copy("test", "test"); // test.txt -> 0

You can't avoid this problem just by comparing the filenames, since one
could be a symlink pointing to the other. The following would destroy
test1 if test2 is a link to test1:

copy("test1", "test2");



Reproduce code:
---------------
copy("test", "test");


Expected result:
----------------
Nothing happens or a file open error.

Actual result:
--------------
Contents in source file is lost.


------------------------------------------------------------------------


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