how to get version of package 'x' when installing package 'y'

[Fulko Hew]

On Wed, Nov 18, 2009 at 4:06 PM, Jos Vos <jos at xos.nl> wrote:

> On Wed, Nov 18, 2009 at 03:52:59PM -0500, Fulko Hew wrote:
>
> > Here's my dilemma (maybe I'm taking the wrong approach)...
> >
> > In the spec file for 'mypackage', I want to have a shell script as part
> of
> > the %post
> > that does something based on the version of _another_ of my (already
> > installed) packages
> >
> > in pseudo code:
> >
> > %post
> >
> > VER=`rpm -q other_package --queryformat'%{VERSION}'
> > if VER > 1.2 then
> >    do something
> > else
> >    do something different
> > fi
>
> Use %trigger scripts.  In your mypackage spec file, add:
>
>
> %triggerin -- other_package > 1.2
> do something
>
> %triggerin -- other_package <= 1.2
> do something different
>
>
> This will execute the scripts every time other_package is installed/updated
> and also when your package is installed/upgraded and other_package was
> already installed.


Thanks!
That was exactly what I was looking for.

My trouble was that the feature wasn't described in 'Maximum RPM' and so
I didn't know it existed and, fortunately, the version of RPM on my target
has
this feature.
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