From a86f851619f720b8c4a74d01274c5e2bf012d451 Mon Sep 17 00:00:00 2001
From: Steve Langasek <steve.langasek@canonical.com>
Date: Sat, 3 Nov 2012 00:39:19 +0100
Subject: cherry pick 39a07ec8f2c612a5af234c7713571362f7ca90b4

---
 debian/apt.auto-removal.sh | 67 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 debian/apt.auto-removal.sh

(limited to 'debian/apt.auto-removal.sh')

diff --git a/debian/apt.auto-removal.sh b/debian/apt.auto-removal.sh
new file mode 100644
index 000000000..8f6fc2efc
--- /dev/null
+++ b/debian/apt.auto-removal.sh
@@ -0,0 +1,67 @@
+#!/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)
+# 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.
+
+config_file=/etc/apt/apt.conf.d/01autoremove-kernels
+
+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 'linux-image-[0-9]*'|awk '/^ii/ { print $2 }' | sed -e's/linux-image-//')
+
+latest_version=""
+for i in $list; do
+	if version_test_gt "$i" "$latest_version"; then
+		latest_version="$i"
+	fi
+done
+
+kernels=$(sort -u <<EOF
+$latest_version
+$installed_version
+$running_version
+EOF
+)
+
+cat > "$config_file".dpkg-new <<EOF
+# File autogenerated by $0, do not edit
+APT
+{
+  NeverAutoRemove
+  {
+EOF
+for kernel in $kernels; do
+	echo "    \"^linux-image-$kernel.*\";" >> "$config_file".dpkg-new
+	echo "    \"^linux-image-extra-$kernel.*\";" >> "$config_file".dpkg-new
+	echo "    \"^linux-signed-image-$kernel.*\";" >> "$config_file".dpkg-new
+done
+cat >> "$config_file".dpkg-new <<EOF
+  };
+};
+EOF
+mv "$config_file".dpkg-new "$config_file"
-- 
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