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

From: Date: Sun, 26 Jun 2005 23:19:11 +0000
Subject: #32160 [Opn->Asn]: Copying a file into itself leads to data loss
References: 1  Groups: php.bugs 
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 ID:               32160
 Updated by:       tony2001@php.net
 Reported By:      chernyshevsky at hotmail dot com
-Status:           Open
+Status:           Assigned
 Bug Type:         Filesystem function related
 Operating System: *
 PHP Version:      4CVS-2005-06-20
-Assigned To:      
+Assigned To:      ilia
 New Comment:

Assigned to Ilia so he won't forget to commit it after 4.4 release.


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

[2005-06-22 18:14:10] iliaa@php.net

Fixed in PHP5 CVS, will be applied to 4.X tree after 4.4 release.

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

[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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