CentOS - Jul 2013 - Understanding RPM trigger scripts?

I'm trying to get my head around RPM trigger scripts - but currently 
getting very confused ...

I have a custom RPM which has in its spec file a '%triggerin' script for
the 'kernel' RPM - i.e. a script that I want to run when the kernel RPM 
is upgraded/installed

This works OK - once my custom RPM is installed, if the kernel is 
subsequently upgraded/installed, my trigger script is run

However, the same trigger script is also run when I upgrade my custom 
RPM - which I don't want - and so far, I can't find a reliable way of 
making sure it isn't run in this case. The more I search for an answer, 
the more I get confused :-)

I know this is a bit off-topic and obscure, but does anyone know how to 
make sure such a trigger script is only run when the RPM that triggers 
it is upgraded/installed - and not when the RPM that contains the 
trigger script is upgraded?

Thanks

James Pearson

> -----Original Message-----
> From: James Pearson [mailto:james-p at moving-picture.com]
> Sent: Monday, July 08, 2013 11:45
> To: CentOS mailing list
> Subject: [CentOS] Understanding RPM trigger scripts?
> 
> I'm trying to get my head around RPM trigger scripts - but currently
> getting very confused ...
> 
> I have a custom RPM which has in its spec file a '%triggerin'
script
> for
> the 'kernel' RPM - i.e. a script that I want to run when the kernel
RPM
> is upgraded/installed
> 
> This works OK - once my custom RPM is installed, if the kernel is
> subsequently upgraded/installed, my trigger script is run
> 
> However, the same trigger script is also run when I upgrade my custom
> RPM - which I don't want - and so far, I can't find a reliable way
of
> making sure it isn't run in this case. The more I search for an
answer,
> the more I get confused :-)
> 
> I know this is a bit off-topic and obscure, but does anyone know how
to
> make sure such a trigger script is only run when the RPM that triggers
> it is upgraded/installed - and not when the RPM that contains the
> trigger script is upgraded?
> 
> Thanks
> 
> James Pearson
While looking into doing similar things a few years ago I ran across the
following PDF.
It has several pages on doing triggers, and looked promising to help my
understanding, I just got pulled onto a different project before getting
to test out the ideas.
I think page 25 would be of interest to you.

http://www.redhat.com/promo/summit/2010/presentations/summit/opensource-
for-it-leaders/thurs/pwaterma-2-rpm/RPM-ifying-System-Configurations.pdf


I hope this pointer to info helps.

Even when this disclaimer is not here:
I am not a contracting officer. I do not have authority to make or
modify the terms of any contract.