php upload give me some problems

tanoatlq · 04-28-2008, 09:26 AM

Hello,
I make a simple php upload approach that launches shell
scripts on the server with the a file provided by the client.
On the client machine, the progress bar that should shows the
reloading status of the page never reaches the end.
However, the commands launched by php works.

I try to set these commands to work in the background as

system("/usr/bin/sudo -u myuser script.sh &");

but the problem persists. I am new of php language, and I would
like to know what sort of things could make this solution defects.
I try with flush(), but no way.
What could be that cannot make me sleep?

Guttorm · 04-29-2008, 03:05 AM

Hi

I've had similar problems - and I remember I played with nohup and redirecting output. I got it to work somehow, but it was not stable. I think it's because the command's output is supposed to go to the browser, and that can be tricky when the browser is gone.

But I found one solution in the end. Instead of outputting progress to stdout, I just output the progress to a text file. To get the process to run independent of the web-server (so you can even restart the webserver while the script is running), I used the at command.

PHP Code:



$cmd = "/usr/bin/sudo -u myuser script.sh &>/dev/null"; 
$cmd = "echo ".EscapeShellArg($cmd)." | at now"; 
exec($cmd);

Then I just read the progress file and output it to the browser. The client can then reload the page to see how it's going, or you could make it auto-reload with a meta tag every now and then.

You probably have to add www-data to /etc/at.allow or remove it from /etc/at.deny for it to work.

tanoatlq · 04-29-2008, 06:28 AM

In my case the script.sh launch openoffice that should run in loop.
I will try the at tip. However I would like to know if less tricky solutions exists.
It seems a terrible hack! How could you think it? :-)

tanoatlq · 04-30-2008, 08:15 AM

Hey, it appears to work fine!
I am testing the robustiness of my php code, and I would
like to know what could I do when the user upload a file
that does not exist in the local machine..
move_uploaded_file() does not handle this case correctly..

graemef · 04-30-2008, 04:28 PM

I can't exactly remember but doesn't that just give you a new file of size zero? In which case look at the size of the file.

tanoatlq · 05-01-2008, 04:38 AM

It could be. However I though that any function that does this work more specifically
should exists.