#!/bin/sh set -e # Author: Steve Langasek <steve.langasek@canonical.com> # # Mark as not-for-autoremoval those kernel packages that are: # - the currently booted version # - the kernel version we've been called for # - the latest kernel version (determined using rules copied from the grub # package for deciding which kernel to boot) # - the second-latest kernel version, if the booted kernel version is # already the latest and this script is called for that same version, # to ensure a fallback remains available in the event the newly-installed # kernel at this ABI fails to boot # In the common case, this results in exactly two kernels saved, but it can # result in three kernels being saved. It's better to err on the side of # saving too many kernels than saving too few. # # We generate this list and save it to /etc/apt/apt.conf.d instead of marking # packages in the database because this runs from a postinst script, and apt # will overwrite the db when it exits. eval $(apt-config shell APT_CONF_D Dir::Etc::parts/d) test -n "${APT_CONF_D}" || APT_CONF_D="/etc/apt/apt.conf.d" config_file=${APT_CONF_D}/01autoremove-kernels eval $(apt-config shell DPKG Dir::bin::dpkg/f) test -n "$DPKG" || DPKG="/usr/bin/dpkg" installed_version="$1" running_version="$(uname -r)" version_test_gt () { local version_test_gt_sedexp="s/[._-]\(pre\|rc\|test\|git\|old\|trunk\)/~\1/g" local version_a="`echo "$1" | sed -e "$version_test_gt_sedexp"`" local version_b="`echo "$2" | sed -e "$version_test_gt_sedexp"`" $DPKG --compare-versions "$version_a" gt "$version_b" return "$?" } list="$(${DPKG} -l | awk '/^ii[ ]+(linux|kfreebsd|gnumach)-image-[0-9]+\./ && $2 !~ /-dbg$/ { print $2 }' | sed -e 's#\(linux\|kfreebsd\|gnumach\)-image-##')" latest_version="" previous_version="" for i in $list; do if version_test_gt "$i" "$latest_version"; then previous_version="$latest_version" latest_version="$i" elif version_test_gt "$i" "$previous_version"; then previous_version="$i" fi done if [ "$latest_version" != "$installed_version" ] \ || [ "$latest_version" != "$running_version" ] \ || [ "$installed_version" != "$running_version" ] then # We have at least two kernels that we have reason to think the # user wants, so don't save the second-newest version. previous_version= fi kernels="$(echo "$latest_version $installed_version $running_version $previous_version" | sort -u | sed -e 's#\.#\\.#g' )" generateconfig() { cat <<EOF // DO NOT EDIT! File autogenerated by $0 APT::NeverAutoRemove { EOF apt-config dump --no-empty --format '%v%n' 'APT::VersionedKernelPackages' | while read package; do for kernel in $kernels; do echo " \"^${package}-${kernel}$\";" done done echo '};' } generateconfig > "${config_file}.dpkg-new" mv "${config_file}.dpkg-new" "$config_file"