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 list="$("${DPKG}" -l | awk '/^[ih][^nc][ ]+(linux|kfreebsd|gnumach)-image-[0-9]+\./ && $2 !~ /-dbg(:.*)?$/ && $2 !~ /-dbgsym(:.*)?$/ { print $2,$3; }' \
  22    | sed -e 's#^\(linux\|kfreebsd\|gnumach\)-image-##' -e 's#:[^:]\+ # #')"
  23 debverlist="$(echo "$list" | cut -d' ' -f 2 | sort --unique --reverse --version-sort)"
  24
  25 if [ -n "$1" ]; then
  26         installed_version="$(echo "$list" | awk "\$1 == \"$1\" { print \$2;exit; }")"
  27 fi
  28 unamer="$(uname -r)"
  29 if [ -n "$unamer" ]; then
  30         running_version="$(echo "$list" | awk "\$1 == \"$unamer\" { print \$2;exit; }")"
  31 fi
  32 latest_version="$(echo "$debverlist" | sed -n 1p)"
  33 previous_version="$(echo "$debverlist" | sed -n 2p)"
  34
  35 debkernels="$(echo "$latest_version
  36 $installed_version
  37 $running_version
  38 $previous_version" | sort -u | sed -e '/^$/ d')"
  39 kernels="$( (echo "$1
  40 $unamer"; for deb in $debkernels; do echo "$list" | awk "\$2 == \"$deb\" { print \$1; }"; done; ) \
  41    | sed -e 's#\.#\\.#g' -e '/^$/ d' | sort -u)"
  42
  43 generateconfig() {
  44         cat <<EOF
  45 // DO NOT EDIT! File autogenerated by $0
  46 APT::NeverAutoRemove
  47 {
  48 EOF
  49         for package in $(apt-config dump --no-empty --format '%v%n' 'APT::VersionedKernelPackages'); do
  50                 for kernel in $kernels; do
  51                         echo "   \"^${package}-${kernel}$\";"
  52                 done
  53         done
  54         echo '};'
  55         if [ "${APT_AUTO_REMOVAL_KERNELS_DEBUG:-true}" = 'true' ]; then
  56                 cat <<EOF
  57 /* Debug information:
  58 # dpkg list:
  59 $(dpkg -l | grep '\(linux\|kfreebsd\|gnumach\)-image-')
  60 # list of installed kernel packages:
  61 $list
  62 # list of different kernel versions:
  63 $debverlist
  64 # Installing kernel: $installed_version ($1)
  65 # Running kernel: $running_version ($unamer)
  66 # Last kernel: $latest_version
  67 # Previous kernel: $previous_version
  68 # Kernel versions list to keep:
  69 $debkernels
  70 # Kernel packages (version part) to protect:
  71 $kernels
  72 */
  73 EOF
  74         fi
  75 }
  76 generateconfig "$@" > "${config_file}.dpkg-new"
  77 mv -f "${config_file}.dpkg-new" "$config_file"
  78 chmod 444 "$config_file"