Possible to check version of package in %pre/%prerun -> -> changes outcome of install ?

[Morgan Cox]

Hi

I am trying to build an RPM that when installed/upgraded checks the present
version of the package and depending on if the present version is a certain
version or higher -> do something if lower -> do something else.

i.e if present version is 1.0 or higher -> do something

else

if present present version is < 1.0 -> do something else.

I have been told that I shouldn't use rpm command (i.e 'rpm-qa')  in the
inside the %pre or %prerun  scriptlet as this can cause an RPM - how can I
query the existing version in the rpmbuild/spec file?

Any pointers would be great.

regards
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