RPM scriptlets are passed in $1 ( the number of packages of this name which will be left on the system when the action completes ) so they can determine whether a package upgrade or removal is occurring. For reasons outside my control, I believe the next version of the package may have a different package name than the first version. I tried to create a new package that "obsoletes" the old one and upgraded using it. However, the old package postun scriptlet still got $1 == 0 and my postun cleanup script ran.
This is a bit of an edge case, because technically there are 0 packages with that name remaining, but I thought the obsoletes case might pretend that there's still a package with that name during the upgrade. Is there a way to test for the situation when a package is being obsoleted so that the scriptlet can determine an upgrade is occurring instead of a package removal?
Can you try this command to check the rpm packages in the OS
rpm -qa | grep -i "(RPMNAME)"
来源：https://stackoverflow.com/questions/48070042/how-to-detect-upgrade-when-an-rpm-that-obsoletes-another-rpm-is-being-installed