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 Topic: Php reports Read-Only File System |
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cipocip
Joined: 06 Sep 2013
Posts: 3
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 Posted: Fri 06 Sep '13 20:02 Post subject: Php reports Read-Only File System |
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Hello
I am a user (not root) on a Red Hat Enterprise Linux server. I am unable to use PHP (Apache 2.0) to write files with fwrite to my public_html. Also, when I try something like shell_exec('rm some_file'), I get the error message: "Read-Only file system". To isolate the problem, I chmod the public_html to rwx for ugo, but that didn't solve the problem. It's only through PHP (web user nobody) that I can't write to my public_html directory.
What migh be causing this ?
Thanks. |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7371
Location: Germany, Next to Hamburg
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| Posted: Sat 07 Sep '13 18:37 Post subject: |
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shell_exec has nothing to do with the permission of the folger. shell_exec tries to execute the file. SO that file needs to bee 0777.
from the docs
| Code: |
shell_exec — Execute command via shell and return the complete output as a string
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What are you trying to do? just cerate a text file content in it? |
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cipocip
Joined: 06 Sep 2013
Posts: 3
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| Posted: Sat 07 Sep '13 19:51 Post subject: |
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Hello James,
In a nutshell, I am unable to write (or delete) any file in public_html through PHP.
I did set the permissions of "some_file" to o+rwx in my example - shell_exec('rm some_file'). When I redirect stderr to stdout, I get the important message/clue: "Read-Only file system". I am very puzzled by that, because all the permissions of the folder and files in it are set to 777, and public_html is obviously not read-only. If it was a permission problem, it should warn me: "Permission denied".
Another attempt of writing anything at all using fwrite failed as well.
I must add that I have tested all my scripts on a separate Apache/Ubuntu installation on my home computer, and they work as they should, no syntax errors. |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7371
Location: Germany, Next to Hamburg
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| Posted: Sat 07 Sep '13 22:11 Post subject: |
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Can you please post a snippet? I need to try that out  |
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cipocip
Joined: 06 Sep 2013
Posts: 3
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| Posted: Sat 07 Sep '13 23:10 Post subject: |
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Sure, but you won't be able to learn much from it since you don't have access to the actual Red Hat server. Here is one test file:
| Code: | <?php
$myFile = "testFile.txt";
$fh = fopen($myFile, 'w') or die("can't open file");
$stringData = "This is a test\n";
fwrite($fh, $stringData);
fclose($fh);
?> |
Here is another one:
| Code: | <?php
$output=shell_exec('rm file.txt 2>&1');
echo "<pre>$output</pre>";
?> |
The output of the first test file is: can't open file (not very helpful), and for the second file: | Code: | | rm: cannot remove `file.txt': Read-only file system |
The permissions of public_html are: drwxrwxrwx. And of course, file.txt exists, and I can remove it as a regular user.
If you have any diagnostic tests that I could try, I am really curious to find the explanation for this. Somehow the filesystem appears as read-only to the outside world (user nobody). |
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