first release - trivial but working
This commit is contained in:
bisco
@@ -0,0 +1,422 @@
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#!/bin/bash
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# PLONK - PLONK Leaves Only Needed Kernels
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#
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# This script removes old Debian kernels
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# It also purges old kernel packages left in "rc" state
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#
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# In short: old kernels go plonk.
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#
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# Author: bisco <bisco__AT__younerd__DOT_org>
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# Script inspired by the following cyberciti post:
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# https://www.cyberciti.biz/faq/debian-ubuntu-linux-delete-old-kernel-images-command/
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set -euo pipefail
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### Variables
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APT_GET="$(command -v apt-get || true)"
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DPKG_QUERY="$(command -v dpkg-query || true)"
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KERNELVER="$(uname -r)"
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KEEP_KERNELS="2"
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ACTION=""
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ASSUME_YES="no"
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KERNELS_TO_KEEP=()
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ABIS_TO_KEEP=()
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OLD_KERNELS=()
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RC_KERNELS=()
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PKGS_TO_PURGE=()
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### End Variables
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### Code.
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### Please don't edit below unless if you know what you're doing.
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### Check if something went wrong
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check_error(){
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echo "====> ERROR!"
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echo "====> Script failed on line ${BASH_LINENO[0]}"
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exit 1
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}
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### Run check_error function on errors
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trap check_error ERR
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### Show help and exits
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usage(){
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echo "PLONK - PLONK Leaves Only Needed Kernels"
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echo ""
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echo "Old kernels go plonk."
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echo ""
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echo "Usage: $0 [option]"
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echo ""
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echo "-l | --list : list old kernel packages"
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echo "-n | --dry-run : simulate old kernel packages removal"
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echo "-r | --remove : remove old kernel packages"
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echo "-k | --keep NUM : number of kernels to keep. Default: ${KEEP_KERNELS}"
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echo "-y | --yes : assume yes when removing packages"
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echo "-h | --help : show this help and exits"
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echo ""
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echo "Examples:"
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echo "$0 --list"
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echo "$0 --dry-run"
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echo "sudo $0 --remove"
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echo "sudo $0 --remove --keep 3"
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echo ""
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}
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### Check if all binaries are properly installed on target system
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check_binary(){
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if [ "${APT_GET}" == "" ] || [ "${DPKG_QUERY}" == "" ]; then
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echo "[FAIL] Some binaries not found."
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echo "[INFO] Please make sure you have: apt-get, dpkg-query"
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exit 1
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else
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echo "[OK] All binaries are properly installed. Let's go on!"
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fi
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}
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### Check if the script has been run by root when removing packages
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check_root(){
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if [ "${ACTION}" != "remove" ]; then
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return
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fi
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if [ "$(id -u)" == "0" ]; then
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echo "[OK] Check root permissions"
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else
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echo "[FAIL] Check root permissions"
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echo "[INFO] Run this script as root or sudo"
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exit 1
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fi
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}
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### Extract kernel version from package name
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pkg_to_kernel_version(){
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local PKG="${1%%:*}"
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case "${PKG}" in
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linux-image-unsigned-*)
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echo "${PKG#linux-image-unsigned-}"
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;;
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linux-image-*)
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echo "${PKG#linux-image-}"
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;;
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linux-headers-*)
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echo "${PKG#linux-headers-}"
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;;
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*)
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return 1
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;;
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esac
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}
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### Extract Debian kernel ABI from kernel package version
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kernel_abi_from_version(){
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local VERSION="$1"
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case "${VERSION}" in
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*-cloud-amd64)
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echo "${VERSION%-cloud-amd64}"
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;;
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*-rt-amd64)
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echo "${VERSION%-rt-amd64}"
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;;
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*-amd64)
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echo "${VERSION%-amd64}"
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;;
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*-686-pae)
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echo "${VERSION%-686-pae}"
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;;
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*-686)
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echo "${VERSION%-686}"
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;;
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*-cloud-arm64)
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echo "${VERSION%-cloud-arm64}"
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;;
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*-rt-arm64)
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echo "${VERSION%-rt-arm64}"
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;;
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*-arm64)
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echo "${VERSION%-arm64}"
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;;
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*-common)
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echo "${VERSION%-common}"
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;;
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*)
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echo "${VERSION%-*}"
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;;
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esac
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}
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### List installed Debian kernel packages
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list_installed_kernel_packages(){
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{
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"${DPKG_QUERY}" -W -f='${db:Status-Abbrev}\t${binary:Package}\n' \
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'linux-image-[0-9]*' \
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'linux-image-unsigned-[0-9]*' \
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'linux-headers-[0-9]*' \
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2>/dev/null || true
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} | awk '$1 == "ii" { print $2 }' | sort -u
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}
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### List residual Debian kernel packages in rc state
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list_rc_kernel_packages(){
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{
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"${DPKG_QUERY}" -W -f='${db:Status-Abbrev}\t${binary:Package}\n' \
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'linux-image-[0-9]*' \
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'linux-image-unsigned-[0-9]*' \
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'linux-headers-[0-9]*' \
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2>/dev/null || true
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} | awk '$1 == "rc" { print $2 }' | sort -u
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}
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### List installed Debian kernel image versions
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list_installed_kernel_versions(){
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{
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"${DPKG_QUERY}" -W -f='${db:Status-Abbrev}\t${binary:Package}\n' \
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'linux-image-[0-9]*' \
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'linux-image-unsigned-[0-9]*' \
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2>/dev/null || true
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} | awk '$1 == "ii" { print $2 }' \
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| while read -r PKG; do
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pkg_to_kernel_version "${PKG}"
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done \
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| sort -V -u
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}
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### Build the list of kernels that should be kept
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build_keep_list(){
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local INSTALLED_KERNELS=()
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local VERSION=""
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local ABI=""
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local I=""
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mapfile -t INSTALLED_KERNELS < <(list_installed_kernel_versions)
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KERNELS_TO_KEEP=("${KERNELVER}")
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for (( I=${#INSTALLED_KERNELS[@]}-1; I>=0 && ${#KERNELS_TO_KEEP[@]}<KEEP_KERNELS; I-- )); do
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VERSION="${INSTALLED_KERNELS[$I]}"
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if [ "${VERSION}" == "${KERNELVER}" ]; then
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continue
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fi
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KERNELS_TO_KEEP+=("${VERSION}")
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done
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ABIS_TO_KEEP=()
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for VERSION in "${KERNELS_TO_KEEP[@]}"; do
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ABI="$(kernel_abi_from_version "${VERSION}")"
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ABIS_TO_KEEP+=("${ABI}")
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done
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}
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### Check if a package belongs to a kernel that should be kept
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is_kernel_to_keep(){
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local PKG="$1"
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local VERSION=""
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local ABI=""
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local KEEP=""
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VERSION="$(pkg_to_kernel_version "${PKG}")"
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ABI="$(kernel_abi_from_version "${VERSION}")"
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for KEEP in "${KERNELS_TO_KEEP[@]}"; do
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if [ "${VERSION}" == "${KEEP}" ]; then
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return 0
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fi
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done
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for KEEP in "${ABIS_TO_KEEP[@]}"; do
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if [ "${ABI}" == "${KEEP}" ]; then
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return 0
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fi
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done
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return 1
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}
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### List old installed kernel packages
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list_old_installed_kernels(){
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local PKG=""
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while read -r PKG; do
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if [ "${PKG}" == "" ]; then
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continue
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fi
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if ! is_kernel_to_keep "${PKG}"; then
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echo "${PKG}"
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fi
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done < <(list_installed_kernel_packages) | sort -u
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}
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### Build final package list
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build_purge_list(){
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mapfile -t OLD_KERNELS < <(list_old_installed_kernels)
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mapfile -t RC_KERNELS < <(list_rc_kernel_packages)
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PKGS_TO_PURGE=("${OLD_KERNELS[@]}" "${RC_KERNELS[@]}")
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}
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### Print script summary
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print_summary(){
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echo ""
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echo "Running kernel : ${KERNELVER}"
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echo "Keeping kernels: ${KERNELS_TO_KEEP[*]}"
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echo "Keeping ABI : ${ABIS_TO_KEEP[*]}"
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echo ""
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if [ "${#OLD_KERNELS[@]}" -gt 0 ]; then
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echo "Old installed kernel packages:"
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printf ' %s\n' "${OLD_KERNELS[@]}"
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else
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echo "[OK] No old installed kernel packages found."
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fi
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echo ""
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if [ "${#RC_KERNELS[@]}" -gt 0 ]; then
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echo "Residual rc kernel packages:"
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printf ' %s\n' "${RC_KERNELS[@]}"
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else
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echo "[OK] No residual rc kernel packages found."
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fi
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echo ""
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}
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### Simulate package purge
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dry_run(){
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if [ "${#PKGS_TO_PURGE[@]}" -eq 0 ]; then
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echo "[OK] Nothing to purge."
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exit 0
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fi
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"${APT_GET}" -s purge "${PKGS_TO_PURGE[@]}"
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}
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### Remove old kernel packages
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remove_kernels(){
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local ANSWER=""
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if [ "${#PKGS_TO_PURGE[@]}" -eq 0 ]; then
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echo "[OK] Nothing to purge."
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exit 0
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fi
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if [ "${ASSUME_YES}" != "yes" ]; then
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read -r -p "Proceed with apt-get purge? [y/N] " ANSWER
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case "${ANSWER}" in
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y|Y|yes|YES)
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;;
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*)
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echo "Aborted."
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exit 0
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;;
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esac
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fi
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if [ "${ASSUME_YES}" == "yes" ]; then
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"${APT_GET}" -y purge "${PKGS_TO_PURGE[@]}"
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else
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"${APT_GET}" purge "${PKGS_TO_PURGE[@]}"
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fi
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echo ""
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echo "Old kernels have been successfully plonked."
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}
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### Parse options
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while [ "$#" -gt 0 ]; do
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case "$1" in
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-l | --list)
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ACTION="list"
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;;
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-n | --dry-run)
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ACTION="dry-run"
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;;
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-r | --remove)
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ACTION="remove"
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;;
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-k | --keep)
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shift
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if ! [[ "${1:-}" =~ ^[0-9]+$ ]]; then
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echo "[FAIL] --keep requires a number"
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exit 1
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fi
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if [ "$1" -lt 1 ]; then
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echo "[FAIL] --keep requires a number greater than zero"
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exit 1
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fi
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KEEP_KERNELS="$1"
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;;
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-y | --yes)
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ASSUME_YES="yes"
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;;
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-h | --help)
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usage
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exit 0
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;;
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*)
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usage
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exit 1
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;;
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esac
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shift
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done
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### Main
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if [ "${ACTION}" == "" ]; then
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usage
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exit 1
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fi
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check_binary
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check_root
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build_keep_list
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build_purge_list
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print_summary
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case "${ACTION}" in
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list)
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exit 0
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;;
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dry-run)
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dry_run
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;;
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remove)
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remove_kernels
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;;
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esac
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Reference in New Issue
Block a user