| 1 | #!/bin/sh |
| 2 | set -e |
| 3 | |
| 4 | # Author: Steve Langasek <steve.langasek@canonical.com> |
| 5 | # |
| 6 | # Mark as not-for-autoremoval those kernel packages that are: |
| 7 | # - the currently booted version |
| 8 | # - the kernel version we've been called for |
| 9 | # - the latest kernel version (determined using rules copied from the grub |
| 10 | # package for deciding which kernel to boot) |
| 11 | # - the second-latest kernel version, if the booted kernel version is |
| 12 | # already the latest and this script is called for that same version, |
| 13 | # to ensure a fallback remains available in the event the newly-installed |
| 14 | # kernel at this ABI fails to boot |
| 15 | # In the common case, this results in exactly two kernels saved, but it can |
| 16 | # result in three kernels being saved. It's better to err on the side of |
| 17 | # saving too many kernels than saving too few. |
| 18 | # |
| 19 | # We generate this list and save it to /etc/apt/apt.conf.d instead of marking |
| 20 | # packages in the database because this runs from a postinst script, and apt |
| 21 | # will overwrite the db when it exits. |
| 22 | |
| 23 | |
| 24 | eval $(apt-config shell APT_CONF_D Dir::Etc::parts/d) |
| 25 | test -n "${APT_CONF_D}" || APT_CONF_D="/etc/apt/apt.conf.d" |
| 26 | config_file=${APT_CONF_D}/01autoremove-kernels |
| 27 | |
| 28 | eval $(apt-config shell DPKG Dir::bin::dpkg/f) |
| 29 | test -n "$DPKG" || DPKG="/usr/bin/dpkg" |
| 30 | |
| 31 | installed_version="$1" |
| 32 | running_version="$(uname -r)" |
| 33 | |
| 34 | |
| 35 | version_test_gt () |
| 36 | { |
| 37 | local version_test_gt_sedexp="s/[._-]\(pre\|rc\|test\|git\|old\|trunk\)/~\1/g" |
| 38 | local version_a="`echo "$1" | sed -e "$version_test_gt_sedexp"`" |
| 39 | local version_b="`echo "$2" | sed -e "$version_test_gt_sedexp"`" |
| 40 | $DPKG --compare-versions "$version_a" gt "$version_b" |
| 41 | return "$?" |
| 42 | } |
| 43 | |
| 44 | list="$(${DPKG} -l | awk '/^ii[ ]+(linux|kfreebsd|gnumach)-image-[0-9]/ && $2 !~ /-dbg$/ { print $2 }' | sed -e 's#\(linux\|kfreebsd\|gnumach\)-image-##')" |
| 45 | |
| 46 | latest_version="" |
| 47 | previous_version="" |
| 48 | for i in $list; do |
| 49 | if version_test_gt "$i" "$latest_version"; then |
| 50 | previous_version="$latest_version" |
| 51 | latest_version="$i" |
| 52 | elif version_test_gt "$i" "$previous_version"; then |
| 53 | previous_version="$i" |
| 54 | fi |
| 55 | done |
| 56 | |
| 57 | if [ "$latest_version" != "$installed_version" ] \ |
| 58 | || [ "$latest_version" != "$running_version" ] \ |
| 59 | || [ "$installed_version" != "$running_version" ] |
| 60 | then |
| 61 | # We have at least two kernels that we have reason to think the |
| 62 | # user wants, so don't save the second-newest version. |
| 63 | previous_version= |
| 64 | fi |
| 65 | |
| 66 | kernels="$(echo "$latest_version |
| 67 | $installed_version |
| 68 | $running_version |
| 69 | $previous_version" | sort -u | sed -e 's#\.#\\.#g' )" |
| 70 | |
| 71 | generateconfig() { |
| 72 | cat <<EOF |
| 73 | // DO NOT EDIT! File autogenerated by $0 |
| 74 | APT::NeverAutoRemove |
| 75 | { |
| 76 | EOF |
| 77 | apt-config dump --no-empty --format '%v%n' 'APT::VersionedKernelPackages' | while read package; do |
| 78 | for kernel in $kernels; do |
| 79 | echo " \"^${package}-${kernel}$\";" |
| 80 | done |
| 81 | done |
| 82 | echo '};' |
| 83 | } |
| 84 | generateconfig > "${config_file}.dpkg-new" |
| 85 | mv "${config_file}.dpkg-new" "$config_file" |