[K12OSN] Screen Pop - Howto?

[Julius Szelagiewicz]

grrr. substitute $user for $1 in script

On Tue, 1 Sep 2009, Julius Szelagiewicz wrote:

> On Tue, 1 Sep 2009, C. Duncan Hudson wrote:
>
> > Currently the cameras just write an image to a directory on the ltsp
> > server when a customer is detected (IR beam broken).  I could do
> > something else with the image...  whatever makes things easiest.
> >
> > Dunc
> >
> > Julius Szelagiewicz wrote:
> > > there are several ways to "pop" a picture on the user's screen.
> > > You can have an user app waiting for picture showing up in a preset place
> > > - that can be run from .bash_profile. You can have a single app waiting
> > > and displaying the pic on all terminals - for that you need a list of
> > > current DISPLAY variables (I use the single app approach). It is
> > > surprisingly easy. How does the picture appear on the system? How would an
> > > app know about it?
> > > julius
> OK, from the top of my head:
> 0. make file /var/tmp/users , permissions 666
> 1. add this to .bash_profile:
> echo $USER      $DISPLAY        $HOSTNAME >> /var/tmp/users
> xhost +
> 2. make a script checking for new picture, say, every 3 seconds
> #!/bin/sh
> #lookforpicture.sh
> while [ 1 -gt 0 ]
> available=$(ls PICDEIRECTORY|wc -l)
> if [ $available -gt 0 ]
> then
> rm -f whereiwanthemdirectory/*
> mv PICDIRECTORY/* whereiwantthemdirectory
> users=$(who|cut -d " " -f1)
> for user in $users
> do
> display=`grep ^"$1 " /var/tmp/users | tail -1 | cut -d " " -f 2`
> gthumb --display=$display whereiwantthemdirectory/*
> done
> else
> sleep 3
> fi
> repeat
> 3. have a well deserved beer
>
> There are nicer ways to script, but this should work fine. The good - one
> process waiting, the bad - xhost +
>
> Off the top of my head, ymmv.
> julius
>
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