diff options
| -rw-r--r-- | debian/apt.auto-removal.sh | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/debian/apt.auto-removal.sh b/debian/apt.auto-removal.sh index 8f6fc2efc..598aee1a3 100644 --- a/debian/apt.auto-removal.sh +++ b/debian/apt.auto-removal.sh @@ -9,6 +9,10 @@ set -e # - 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. @@ -35,16 +39,30 @@ version_test_gt () list=$(dpkg -l 'linux-image-[0-9]*'|awk '/^ii/ { print $2 }' | sed -e's/linux-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=$(sort -u <<EOF $latest_version $installed_version $running_version +$previous_version EOF ) |