Azureus restart script?

[Frank Murphy]

F18 Azureus crashes out at times.
Usually during middle of the night,
an openjdk problem (already bz'd)

Is there a simple way to restart an app,
auto-magically.

Without overkill like monit?

[Mark LaPierre]

On 06/02/2013 03:43 AM, Frank Murphy wrote:
> F18 Azureus crashes out at times.
> Usually during middle of the night,
> an openjdk problem (already bz'd)
>
> Is there a simple way to restart an app,
> auto-magically.
>
> Without overkill like monit?

You could write a shell script that will check to see if Azureus is 
running and restart it if it isn't.  Call that script every 5 minutes, 
or whatever interval seems appropriate, from a cron job.

[Frank Murphy]

Does this look ok,
#######
crontab -e # as logged in user
*/10 * * * * /home/frank/Scripts/checkazureus.sh
#
cat /home/frank/Scripts/checkazureus.sh
#!/bin/bash
if [-z "$(pgrep azureus)"]
    then
        /usr/bin/azureus
    else
fi
###########

azureus normally starts with xfce session,
but it can exit dues to openjdk bug.

[Jason Stelzer]

If that's an X11 program, you're going to want to set DISPLAY before you
invoke the command.

On Mon, Jun 3, 2013 at 5:10 AM, Frank Murphy  wrote:
> Does this look ok,
> #######
> crontab -e # as logged in user
> */10 * * * * /home/frank/Scripts/checkazureus.sh
> #
> cat /home/frank/Scripts/checkazureus.sh
> #!/bin/bash
> if [-z "$(pgrep azureus)"]
>     then
>         /usr/bin/azureus
>     else
> fi
> ###########
>
> azureus normally starts with xfce session,
> but it can exit dues to openjdk bug.
>
> --
> Regards,
> Frank - I check for new mail app. 20min
> www.frankly3d.com
> --
> users mailing list
> [e-mail]
> To unsubscribe or change subscription options:
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> Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
> Have a question? Ask away: http://ask.fedoraproject.org

[Frank Murphy]

On Mon, 3 Jun 2013 11:00:57 -0400
Jason Stelzer  wrote:
> If that's an X11 program, you're going to want to set DISPLAY
> before you invoke the command.
>
> On Mon, Jun 3, 2013 at 5:10 AM, Frank Murphy 
> wrote:
> > Does this look ok,
> > #######
> > crontab -e # as logged in user
> > */10 * * * * /home/frank/Scripts/checkazureus.sh
> > #
> > cat /home/frank/Scripts/checkazureus.sh
> > #!/bin/bash
> > if [-z "$(pgrep azureus)"]
> >     then
> >         /usr/bin/azureus
> >     else
> > fi
> > ###########
> >
> > azureus normally starts with xfce session,
> > but it can exit dues to openjdk bug.
> >
> > --
> > Regards,
> > Frank - I check for new mail app. 20min
> > www.frankly3d.com
> > --
> > users mailing list
> > [e-mail]
> > To unsubscribe or change subscription options:
> > https://admin.fedoraproject.org/mailman/listinfo/users
> > Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
> > Have a question? Ask away: http://ask.fedoraproject.org

[Frank Murphy]

On Mon, 3 Jun 2013 11:00:57 -0400
Jason Stelzer  wrote:
> If that's an X11 program, you're going to want to set DISPLAY
> before you invoke the command.

export DISPLAY=:0.0 ?

It can be run as gui\cli with a few extra bits:
http://wiki.vuze.com/w/Console_UI
(amend paths to suit fedora installed azureus)

[Jason Stelzer]

On Mon, Jun 3, 2013 at 11:17 AM, Frank Murphy  wrote:
> export DISPLAY=:0.0 ?

Depends on how many monitors you have and how X is setup, but yeah.. that's
the general default. If you're unsure you can echo $DISPLAY in an terminal
in x to see it.

[Cameron Simpson]

On 03Jun2013 10:10, Frank Murphy  wrote:
| 
| Does this look ok,
| #######
| crontab -e # as logged in user
| */10 * * * * /home/frank/Scripts/checkazureus.sh
| #
| cat /home/frank/Scripts/checkazureus.sh
| #!/bin/bash
| if [-z "$(pgrep azureus)"]
|     then
|         /usr/bin/azureus
|     else
| fi
| ###########
| 
| azureus normally starts with xfce session,
| but it can exit dues to openjdk bug.

I am concerned that you _clearly_ have not bothered to even run
this script before posting to the list.

There are several problems:

Cron's environment is _very_ small. So you have no $DISPLAY setting
  and nothing in the script sets it; azureus will not be able to
  display on your screen

Test is a command, and so like any command it needs spaces around
  its name:

if [ -z "$(pgrep azureus)" ]

You have a dangling "else"; syntacticly invalid. Get rid of it.

If azureus is restarted, the script never exits. Background azureus and put its output into a log file:

/usr/bin/azureus >$HOME/azureus.out 2>&1 &

In fact, the argument to "if" is a command-list. So test pgrep directly and invert the "if":

if pgrep -q azureus
    then
      echo "azureus running!"
    else
      echo "restarting azureus"
      /usr/bin/azureus >$HOME/azureus.out 2>&1 &
    fi

But next time? Test drive the script yourself from the command line;
half of this would have been found immediately.

Better than this script would be to run azureus in a loop to start with:

while :
  do  azureus
  done

which will restart it if it quits anyway. No cron jobs playing guessing games.

Cheers,

[Frank Murphy]

On Tue, 4 Jun 2013 08:09:28 +1000
Cameron Simpson  wrote:
> But next time? Test drive the script yourself from the command line;
> half of this would have been found immediately.

It was, hence the question,
and no output to c&p.

Unfortunately, an empty else,
was taught to us as a Java primitive.