debian/apt.auto-removal.sh

   1 #!/bin/sh
   2 set -e
   3 # Mark as not-for-autoremoval those kernel packages that are:
   4 #  - the currently booted version
   5 #  - the kernel version we've been called for
   6 #  - the latest kernel version (as determined by debian version number)
   7 #  - the second-latest kernel version
   8 #
   9 # In the common case this results in two kernels saved (booted into the
  10 # second-latest kernel, we install the latest kernel in an upgrade), but
  11 # can save up to four. Kernel refers here to a distinct release, which can
  12 # potentially be installed in multiple flavours counting as one kernel.
  13
  14 eval $(apt-config shell APT_CONF_D Dir::Etc::parts/d)
  15 test -n "${APT_CONF_D}" || APT_CONF_D="/etc/apt/apt.conf.d"
  16 config_file="${APT_CONF_D}/01autoremove-kernels"
  17
  18 eval $(apt-config shell DPKG Dir::bin::dpkg/f)
  19 test -n "$DPKG" || DPKG="/usr/bin/dpkg"
  20
  21
  22 list="$(${DPKG} -l | awk '/^[ih][^nc][ ]+(linux|kfreebsd|gnumach)-image-[0-9]+\./ && $2 !~ /-dbg$/ && $2 !~ /-dbgsym$/ { print $2,$3; }' \
  23    | sed -e 's#^\(linux\|kfreebsd\|gnumach\)-image-##' -e 's#:[^:]\+ # #')"
  24 debverlist="$(echo "$list" | cut -d' ' -f 2 | sort --unique --reverse --version-sort)"
  25
  26 if [ -n "$1" ]; then
  27         installed_version="$(echo "$list" | awk "\$1 == \"$1\" { print \$2;exit; }")"
  28 fi
  29 unamer="$(uname -r)"
  30 if [ -n "$unamer" ]; then
  31         running_version="$(echo "$list" | awk "\$1 == \"$unamer\" { print \$2;exit; }")"
  32 fi
  33 latest_version="$(echo "$debverlist" | sed -n 1p)"
  34 previous_version="$(echo "$debverlist" | sed -n 2p)"
  35
  36 debkernels="$(echo "$latest_version
  37 $installed_version
  38 $running_version
  39 $previous_version" | sort -u | sed -e '/^$/ d')"
  40 kernels="$( (echo "$1
  41 $unamer"; for deb in $debkernels; do echo "$list" | awk "\$2 == \"$deb\" { print \$1; }"; done; ) \
  42    | sed -e 's#\.#\\.#g' -e '/^$/ d' | sort -u)"
  43
  44 generateconfig() {
  45         cat <<EOF
  46 // DO NOT EDIT! File autogenerated by $0
  47 APT::NeverAutoRemove
  48 {
  49 EOF
  50         apt-config dump --no-empty --format '%v%n' 'APT::VersionedKernelPackages' | while read package; do
  51                 for kernel in $kernels; do
  52                         echo "   \"^${package}-${kernel}$\";"
  53                 done
  54         done
  55         echo '};'
  56 }
  57 generateconfig > "${config_file}.dpkg-new"
  58 mv "${config_file}.dpkg-new" "$config_file"
  59 chmod 444 "$config_file"