[Xastir] Saving serial snapshots

[Gerry Creager]

Carl Makin wrote:
> 
> 
> On Wed, 15 Apr 2009, Gerry Creager wrote:
> 
>> Personally, I think you ought to use the MD5 of the image as a seed 
>> for a RAND, and use that as the filename.  A similar approach could be 
>> used for the extension.
> 
> Ahhh, a challenge.  Well, a bit of one. <grin>
> 
> while [ 1 ]; do
>         kill -SIGUSR1 `cat ~/.xastir/xastir.pid`
>         if [ -f ~/.xastir/tmp/snapshot.png ]; then
>                 md5sum ~/.xastir/tmp/snapshot.png > /tmp/gerrysseed
>                 NEWFILENAME=`openssl rand -rand /tmp/gerrysseed -base64 30`
>                 NEWEXT=`cat /proc/sys/kernel/random/uuid`
>                 mv ~/.xastir/tmp/snapshot.png archive/$NEWFILENAME.$NEWEXT
>                 rm /tmp/gerrysseed
>         fi
>         sleep 300
> done

That'll certainly work and will at least keep the honest ones guessing 
as to the origins of the file.  I'll have to see if we can make 
ImageMagick still detect the correct image type without an extension, or 
if that'll take code.

I just knew that, if given a challenge, the interested student could 
find a solution.

> Um, the uuid thing only works on linux with /proc enabled.

Correct.

> It's obviously a slow day at work today...

Mine was meetings, teleconferences and debugging Fortran code (someone 
else's).  I'm pretty fried right now!

gerry
-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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