migrate2rocky-retained-packages.sh

#!/bin/bash

# migrate2rocky, when migrating from CentOS Stream, will retain packages
# that are newer than those in the target version of Rocky. This script
# attempts to show which packages are retained from Stream by checking
# whether each of them is available in active repos.

dnf makecache
rpm -qa | while read installed_package
do
    repo_package=$(dnf --cacheonly --quiet repoquery "${installed_package}")
    if [ -z "${repo_package}" ]
    then
        echo "${installed_package}"
    fi
done