PHP exec on a Windows with IIS configuration - php

Question

so I have read about 10 answers and everyone seems to suggest ideas which for some reason don't work.
i am trying to execute a simple command line which is "svn update" but it is not working and it returns NULL
so i have tried trial and error the way and for now this is what i can say;
i have tried several commands like
<?php
exec ("cmd /c ping 127.0.0.1 -n 1 > results.txt ");
?>
and
<?php
exec ("cmd /c chdir > results.txt ");
?>
and both work.. infact chdir says the exact position where the php file executing the line is stored on the pc..
so the problem now is, why do some commands like this:
<?php
exec ("cmd /c dir > results.txt ");
?>
don't work? this results and empty value even though inside the folder i have several files and directories.
and why if i use the command prompt to move into the folder where the php file is store and type svn update it works and doing
<?php
exec ("cmd /c svn update > results.txt ");
?>
return a NULL?
any help is really appreciated.
it feels like i have some restrictions dued to the configuration setup because when i try in local using apache i can get most of the commands to work (shell_exec, system, exec, even without the cmd /c)

Answer 1

Ok.
i have managed to solve the issue..
this is what i did:
first check exactly what username is running for the specific website.. to do so do:
<?php
$out = array();
exec('cmd /c whoami 2>&1',$out,$exitcode);
echo "<br />EXEC: ( exitcode : $exitcode )";
echo "<hr /><pre>";
print_r($out);
echo "</pre>";
?>
this will return the computername followed by the username..
now on the computer running the webserver run
control userpasswords2
and give administrator powers to the username whoami said
this will allow you to finally run any command you want using exec or system_exec
on the other hand continuing with my SVN command i found out that I had another problem which is that when you run it, it will look for the config file which is under the administrator account and will give an error saying:
svn: E125001: Can't determine the user's config path
to solve this issue you simply have to specify in the command the config_dir by doing this:
exec('cmd /c svn update --config-dir C:\Users\Administrator\AppData\Roaming\Subversion C:\\inetpub\\vhosts\\websitename\\httpdocs\\folder 2>&1',$out,$exitcode);
hope this helps others which are having problems like the ones i had!

Answer 2

This is likely a system user permissions issue. I tried your example:
<?php exec ("cmd /c dir > results.txt "); ?>
On my Windows7 with Xampp installed and it worked perfectly fine. However with IIS the "user" may not have permissions to the directory, off the top of my head I think it may be the system user IIS-IUSR or something like that.
Here is a link that might help with user permissions for IIS: http://www.iis.net/learn/get-started/planning-for-security/understanding-built-in-user-and-group-accounts-in-iis

Answer 3

Okay, based on your answers, I think you should try this:
Execute your command using the 'svn.exe' executable (replace the [[reposity location]]).
It is possible that your client has another svn.exe location, but you will have to figure that out yourself :)
exec('cmd /c "c:\\Program Files\\TortoiseSVN\\bin\\svn.exe" up "[[repository location]]"');
What happends now?
There is also a second parameter in exec, maybe you should also take a look at that one.

Answer 4

The only thing that helped me was, complete routes:
$template_file = "C:/archivos/archivos.tex"
$cmd = sprintf("C:/texlive/2020/bin/win32/pdflatex.exe " .$template_file );
$result = exec($cmd, $output, $a);