Script help to restart ktorrent on crash!

[thyscorpion]

hi,
i am a novice at linux but not in programming.

Ktorrent crashes very often in teh new release of kubuntu. hence, i have to check if it has crashed every half an hour or so. :-)

Please advise if i can write a script that will periodically check if ktorrent has crashed, and if it has it will invoke it again?

thank you

[penguin.ch]

Re: Script help to restart ktorrent on crash!

Depending on your definition of "crash" the following may or may not work:

Create an executable shell script similar to the following:

#!/bin/bash
if [ ! "`ps -e | grep 'torrent'`" ]
then
 /usr/bin/ktorrent
fi

Add an according entry to the user's cron job table, e.g.:

* * * * *  ~/torrentRevival

[javierrivera]

Re: Script help to restart ktorrent on crash!

Quick dirt python one:

#! /usr/bin/python

import os

for repeat in range(0,10):
   os.system("ktorrent")

This will just start ktorrent until it finish 10 times. If it crashes it will be detected as finished and run again. Of course you can change that 10.

Oh, yes,... a smal bug... you won't be able to close Ktorrent from the gui, the script will start it again .

Javier.

[javierrivera]

Re: Script help to restart ktorrent on crash!

#! /bin/bash

pfff... this unicorn is too old fashioned .

Javier.

[penguin.ch]

Re: Script help to restart ktorrent on crash!

pfff... this unicorn is too old fashioned

Nope - I just love bashing (whom or what ever ...) as well as to keep real python(s) for critters

[thyscorpion]

Re: Script help to restart ktorrent on crash!

@ Unicorn

by crash i mean.. it just crashes and terminates and the KDE crash assistant comes up. (rather annoying buggy ktorrent!)

ok
in the bash file i am about to make:
can u explain what the line
" if [ ! "`ps -e | grep 'torrent'`" ] "
does? (want to learn it also :-P )

And how do i add an according entry to the user's cron job table? {Sorry if i am being too much of a novice}

[thyscorpion]

Re: Script help to restart ktorrent on crash!

@ javierrivera

the pithon code is damn small and sweet.

As i have never coded in python, where do i go about writing it and how do i start it. :-)

thanks

[penguin.ch]

Re: Script help to restart ktorrent on crash!

by crash i mean ... it terminate

Excellent

if [ ! "`ps -e | grep 'torrent'`" ]

"If (K)torrent does not show up in the list of running (!) processes, ..."

how do i add an entry to the user's cron job table

[Alt][F2] kcron

[javierrivera]

Re: Script help to restart ktorrent on crash!

As i have never coded in python, where do i go about writing it and how do i start it. :-)

In any text editor, just as a shell script.

Make it executable and run it. Either from the terminal or double clicking it. Again, just as a shell script.

Or you can use the python command. ie. python scriptname.py

BTW.

#! /usr/bin/python
 
import os
 
exit=1
while exit<>0 :
	exit=os.system("ktorrent")

This will only restart ktorrent if it crashed (exit status different from 0), but will let you close it from the GUI (exit status 0).

Javier.

[SheeEttin]

Re: Script help to restart ktorrent on crash!

Ah, that'll come in handy for Firefox's segfaults.
I'm pretty new to scripting, and I haven't figured out how to do this kind of operation.

On scripting itself, I like to stick to (ba)sh, because you're pretty much guaranteed it'll run anywhere (though the same is true for Python nowadays). It's also easier to perform tasks and lower-level communication, because you've got all your commands right there.

[penguin.ch]

Re: Script help to restart ktorrent on crash!

On scripting itself, I like to stick to (ba)sh, because you're pretty much guaranteed it'll run anywhere

... except for (K)Ubuntu which is favouring the Dash shell (unless manually "dis-improved", that is) :P

[thyscorpion]

Re: Script help to restart ktorrent on crash!

As i have never coded in python, where do i go about writing it and how do i start it. :-)

In any text editor, just as a shell script.

Make it executable and run it. Either from the terminal or double clicking it. Again, just as a shell script.

Or you can use the python command. ie. python scriptname.py

BTW.

#! /usr/bin/python
 
import os
 
exit=1
while exit<>0 :
	exit=os.system("ktorrent")

This will only restart ktorrent if it crashed (exit status different from 0), but will let you close it from the GUI (exit status 0).

Javier.

Hi i tried what you indicated...
got a problem. i ran my .py file and it loaded ktorrent on its own. and i was pleased. but then when ktorrent crashed, it did not revive it.
to show u what how the terminal window looked like, i have attached a snapshot of the terminal.

[M@GO LoBEL]

Re: Script help to restart ktorrent on crash!

Ktorrent crash because a bug with DHT. Disable DHT and the crash will stop.

[thyscorpion]

Re: Script help to restart ktorrent on crash!

@Mago Lobel

OK. but dosn't DHT help a lot in speeding up the downloads? (just asking)

[M@GO LoBEL]

Re: Script help to restart ktorrent on crash!

Not to me. I dont miss it.