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@@ -0,0 +1,67 @@
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+#!/bin/sh
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+
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+set -e
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+
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+# Author: Steve Langasek <steve.langasek@canonical.com>
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+#
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+# Mark as not-for-autoremoval those kernel packages that are:
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+# - the currently booted version
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+# - the kernel version we've been called for
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+# - the latest kernel version (determined using rules copied from the grub
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+# package for deciding which kernel to boot)
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+# In the common case, this results in exactly two kernels saved, but it can
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+# result in three kernels being saved. It's better to err on the side of
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+# saving too many kernels than saving too few.
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+#
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+# We generate this list and save it to /etc/apt/apt.conf.d instead of marking
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+# packages in the database because this runs from a postinst script, and apt
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+# will overwrite the db when it exits.
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+
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+config_file=/etc/apt/apt.conf.d/01autoremove-kernels
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+
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+installed_version="$1"
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+running_version="$(uname -r)"
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+
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+
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+version_test_gt ()
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+{
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+ local version_test_gt_sedexp="s/[._-]\(pre\|rc\|test\|git\|old\|trunk\)/~\1/g"
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+ local version_a="`echo "$1" | sed -e "$version_test_gt_sedexp"`"
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+ local version_b="`echo "$2" | sed -e "$version_test_gt_sedexp"`"
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+ dpkg --compare-versions "$version_a" gt "$version_b"
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+ return "$?"
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+}
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+
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+list=$(dpkg -l 'linux-image-[0-9]*'|awk '/^ii/ { print $2 }' | sed -e's/linux-image-//')
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+
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+latest_version=""
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+for i in $list; do
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+ if version_test_gt "$i" "$latest_version"; then
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+ latest_version="$i"
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+ fi
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+done
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+
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+kernels=$(sort -u <<EOF
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+$latest_version
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+$installed_version
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+$running_version
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+EOF
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+)
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+
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+cat > "$config_file".dpkg-new <<EOF
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+# File autogenerated by $0, do not edit
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+APT
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+{
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+ NeverAutoRemove
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+ {
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+EOF
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+for kernel in $kernels; do
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+ echo " \"^linux-image-$kernel.*\";" >> "$config_file".dpkg-new
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+ echo " \"^linux-image-extra-$kernel.*\";" >> "$config_file".dpkg-new
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+ echo " \"^linux-signed-image-$kernel.*\";" >> "$config_file".dpkg-new
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+done
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+cat >> "$config_file".dpkg-new <<EOF
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+ };
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+};
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+EOF
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+mv "$config_file".dpkg-new "$config_file"
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Steve Langasek