debian/apt.auto-removal.sh

   1 #!/bin/sh
   2
   3 set -e
   4
   5 # Author: Steve Langasek <steve.langasek@canonical.com>
   6 #
   7 # Mark as not-for-autoremoval those kernel packages that are:
   8 #  - the currently booted version
   9 #  - the kernel version we've been called for
  10 #  - the latest kernel version (determined using rules copied from the grub
  11 #    package for deciding which kernel to boot)
  12 # In the common case, this results in exactly two kernels saved, but it can
  13 # result in three kernels being saved.  It's better to err on the side of
  14 # saving too many kernels than saving too few.
  15 #
  16 # We generate this list and save it to /etc/apt/apt.conf.d instead of marking
  17 # packages in the database because this runs from a postinst script, and apt
  18 # will overwrite the db when it exits.
  19
  20 config_file=/etc/apt/apt.conf.d/01autoremove-kernels
  21
  22 installed_version="$1"
  23 running_version="$(uname -r)"
  24
  25
  26 version_test_gt ()
  27 {
  28         local version_test_gt_sedexp="s/[._-]\(pre\|rc\|test\|git\|old\|trunk\)/~\1/g"
  29         local version_a="`echo "$1" | sed -e "$version_test_gt_sedexp"`"
  30         local version_b="`echo "$2" | sed -e "$version_test_gt_sedexp"`"
  31         dpkg --compare-versions "$version_a" gt "$version_b"
  32         return "$?"
  33 }
  34
  35 list=$(dpkg -l 'linux-image-[0-9]*'|awk '/^ii/ { print $2 }' | sed -e's/linux-image-//')
  36
  37 latest_version=""
  38 for i in $list; do
  39         if version_test_gt "$i" "$latest_version"; then
  40                 latest_version="$i"
  41         fi
  42 done
  43
  44 kernels=$(sort -u <<EOF
  45 $latest_version
  46 $installed_version
  47 $running_version
  48 EOF
  49 )
  50
  51 cat > "$config_file".dpkg-new <<EOF
  52 # File autogenerated by $0, do not edit
  53 APT
  54 {
  55   NeverAutoRemove
  56   {
  57 EOF
  58 for kernel in $kernels; do
  59         echo "    \"^linux-image-$kernel.*\";" >> "$config_file".dpkg-new
  60         echo "    \"^linux-image-extra-$kernel.*\";" >> "$config_file".dpkg-new
  61         echo "    \"^linux-signed-image-$kernel.*\";" >> "$config_file".dpkg-new
  62 done
  63 cat >> "$config_file".dpkg-new <<EOF
  64   };
  65 };
  66 EOF
  67 mv "$config_file".dpkg-new "$config_file"