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Bug #29257 breaking copy file to the same
Submitted: 2004-07-19 15:06 UTC Modified: 2004-08-01 01:00 UTC
Votes:4
Avg. Score:5.0 ± 0.0
Reproduced:4 of 4 (100.0%)
Same Version:2 (50.0%)
Same OS:2 (50.0%)
From: zet at male dot ru Assigned:
Status: No Feedback Package: *Directory/Filesystem functions
PHP Version: 4.3.7 OS: Windows XP SP1
Private report: No CVE-ID: None
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 [2004-07-19 15:06 UTC] zet at male dot ru 
Description:
------------
When i copy file with function copy, like this
copy("C:\file.gif", "C:\file.gif"), file was break. His size is 0. 

Reproduce code:
---------------
copy("C:\file.gif", "C:\file.gif");

Expected result:
----------------
IMHO file must stand without changes.

Actual result:
--------------
File changed. His size is 0.

Patches

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 [2004-07-20 02:47 UTC] iliaa@php.net 
what happens if you do: 
copy("C:\\file.gif", "C:\\file.gif")
 [2004-08-01 01:00 UTC] php-bugs at lists dot php dot net 
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2005-01-14 21:40 UTC] chernyshevsky at hotmail dot com 
How come no one is looking into this? It's reproducible on Linux as well. 

copy("test.txt", "test.txt") -> 0 bytes

You can't avoid this problem just by checking the filename, since one could be a symlink pointing to the other. It would introduce platform dependency as well (case-insensitivity on Windows).
 [2005-02-11 07:04 UTC] nasheet at hotmail dot com 
Reproducible with Windows and Linux, looks like platform independant:

copy("/tmp/sess_1151d8174614735db903faef81b4fae0","/tmp/sess_1151d8174614735db903faef81b4fae0");

Actual result:
--------------
File changed to 0 bytes.
 [2005-07-29 04:45 UTC] richard dot managh at gmail dot com 
Same behaviour here, on winxp with php4 and debian with php5, seems conceptually wrong, I would report the exact versions but it would seem this behaviour is constant on every version. Where is the sanity in truncating a file to 0 bytes if the code attempts to copy it over itself? Should preferably check for equivalent filepaths and not perform the copy function, or at least report a warning that the files were the same, both command line copy and cp (win and linux) do that.
 
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