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Description of problem:
In order to be able to call dracut only once per transaction in case of removal, we need some trigger/script which is executed once per transaction even if we remove packages. So far, there are at least two approaches available:
 * Backport file triggers from RPM 4.13. I have some working prototype (meintioned in https://bugzilla.redhat.com/show_bug.cgi?id=1434128#c32 ) for that which includes patched kmod package that has a %transfiletriggerpostun script for the /lib/modules directory, and looks like this is working.
 * Implement %postuntrans script feature, as suggested in https://bugzilla.redhat.com/show_bug.cgi?id=1434128#c26

Version-Release number of selected component (if applicable):
4.11.3-25.el7