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writing rpm spec handle conditional actions

Posted on 2009-05-01
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I'm trying to write an rpm spec file to handle upgrades of a package, currently rpm --erase followed by rpm --install is necessary whereas I want to just do rpm --upgrade.

This is on fedora core 8 and it's a customer package I'm involved with.

The problem I'm having is that there is a database involved where I need to run, possibly several, upgrade scripts. so I need logic that goes something like the code snippet attached
say current version is 2.3.0 and the new one is 2.3.6, ?how to do this within the rpm spec file
 
apply, in order, with error checking, each update script that exists between 2.3.0 and 2.3.6

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Question by:NickUpson
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m1tk4 earned 750 total points
ID: 24325347
Mark a file as a configuration file in the spec, then in afterinstall write the current version to it. When you will next upgrade, this file will not be deleted during uninstall of a previous package, and will not be overwritten by the new version. Then, in afterinstall you can examine its contents, run all required updates and set it to the new version again.
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by:mayank13
mayank13 earned 750 total points
ID: 24708910
I believe this link can help you, here they have explained how to use you %pre, %post, %preun and %postun scripts for install, uninstall and upgrade.

http://fedoraproject.org/wiki/Packaging/ScriptletSnippets#Scriptlet_Ordering

In %pre, %post, %preun and %postun sciplet of your spec file, you can define actions to be performed only for install or upgrade or uninstall.
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