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

[Fulko Hew <fulko.hew@xxxxxxxxx>]

On Wed, Nov 18, 2009 at 4:06 PM, Jos Vos <jos@xxxxxx> 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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