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

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On 10/07/2014 11:00 AM, Morgan Cox wrote:

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

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


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?

Doing rpm queries from inside rpmbuild isn't any more recommended than install-time scriptlets, for similar reasons, and it wouldn't help anyway if you need to do such decisions at install-time.

What you can do from rpm scriptlets is try figuring out the version by other means, such as testing existence/naming of files of the other package, or executing some test-commands (lot of software has some means of outputting its version via --version or such cli switch)

	- Panu -

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