EL8-to-EL9 package remediation

#!/bin/bash

function debug() {
        if [[ "${DEBUG}" == "1" ]]; then
                echo -e "DEBUG:  ${*}"
        fi
}

# If you want debugging, invoke this script as "DEBUG=1 /path/to/this/script"

ARCH=`uname -i`
SWAPPED=(); SKIPPED=(); ERASED=(); NOTERASED=()

echo -e "Initial packages to process: \e[1m`rpm -qa | egrep "el8" | wc -l`\e[0m"
echo -e "Looking for 'el8' packages with \e[1;4m${ARCH}\e[0m and \e[1;4mnoarch\e[0m architectures" && sleep 4 && echo

for i in `rpm -qa | egrep "el8" | sed "s/\.${ARCH}//; s/\.noarch//"`; do
   readarray -t aPkg < <(dnf info ${i} | egrep "^Name|^Version|^Release" | awk '{print $3}')
   pkgBase="${aPkg[0]}" && echo "Processing ${pkgBase}..."
   pCount=`dnf list "${pkgBase}*el9*" | grep -c ${pkgBase}`
   debug "    Found ${pCount} el9 packages for ${pkgBase}"

   if [[ "${pCount}" == "0" ]]; then
        echo "    Did not find an el9 package for ${pkgBase}, erasing..."
        dnf erase -y -q --comment="${0}" ${pkgBase}
        opcode=$?
        if [[ "${opcode}" != "0" ]]; then
                echo "    Erase exited with ${opcode}, saving ${pkgBase} for reporting..."
                NOTERASED+=("${pkgBase}")
        fi
        ERASED+=("${pkgBase}")
   elif [[ "${pCount}" > "1" ]]; then
        echo "    Too many el9 packages for ${pkgBase} (${pCount}), recording for output later"
        dnf list "${pkgBase}*el9*" | grep el9 | sed 's/^/        /'
        SKIPPED+=("${pkgBase}")
   else
        pkgOld="${aPkg[0]}-${aPkg[1]}-${aPkg[2]}"
        echo "    Base Name:      ${pkgBase}"
        echo "    Old Install:    ${pkgOld}"

        newVer=`yum list "${pkgBase}*el9*" | grep \.el9 | awk '{print $2}' | head -1`
        pkgNew=${pkgBase}-${newVer}
        echo "    New Install:    ${pkgNew}"
        dnf swap -y -q --comment="${0}" ${pkgOld} ${pkgNew} --allowerasing --nobest 2>&1 | egrep -v "Already downloaded"

        readarray CHANGED < <( dnf history info last| grep -A99999 "^Packages Altered" | grep -v "Packages Altered" | awk '{printf "%s %s\n", $1, $2}')
        for aChange in "${CHANGED[@]}"; do
                cParse=(${aChange}); action=${cParse[0]}; pkg=${cParse[1]}
                case ${cParse[0]} in
                        "Upgraded") SWAPPED+=("${pkg}") ;;
                        "Downgraded") SWAPPED+=("${pkg}") ;;
                        "Installed") SWAPPED+=("${pkg}") ;;
                        "Reinstalled") SWAPPED+=("${pkg}") ;;
                        "Skipped") SKIPPED+=("${pkg}") ;;
                        "Removed") ERASED+=("${pkg}") ;;
                        "Failed") NOTERASED+=("${pkg}") ;;
                esac
        done
   fi
   echo; echo
done


echo "Packages swapped: "
for pkgSwap in "${SWAPPED[@]}"; do
        echo "${pkgSwap}"
done | column -x
echo

echo "Packages erased: "
for pkgErase in "${ERASED[@]}"; do
        echo "${pkgErase}"
done | column -x
echo

echo "Skipped packages: "
for pkgSkip in "${SKIPPED[@]}"; do
        echo "${pkgSkip}"
done | column -x
echo

echo "Packages not erased: "
for pkgSkip in "${NOTERASED[@]}"; do
                echo "${pkgSkip}"
done | column -x
echo


debug -e "Remaining packages to process: \e[1m`rpm -qa | egrep "el8|noarch" | wc -l`\e[0m"