51-dracut-rescue.install

   1 #!/bin/bash
   2
   3 export LANG=C
   4
   5 COMMAND="$1"
   6 KERNEL_VERSION="$2"
   7 BOOT_DIR_ABS="${3%/*}/0-rescue"
   8 KERNEL_IMAGE="$4"
   9
  10
  11 dropindirs_sort()
  12 {
  13     suffix=$1; shift
  14     args=("$@")
  15     files=$(
  16         while (( $# > 0 )); do
  17             for i in ${1}/*${suffix}; do
  18                 [[ -f $i ]] && echo ${i##*/}
  19             done
  20             shift
  21         done | sort -Vu
  22     )
  23
  24     for f in $files; do
  25         for d in "${args[@]}"; do
  26             if [[ -f "$d/$f" ]]; then
  27                 echo "$d/$f"
  28                 continue 2
  29             fi
  30         done
  31     done
  32 }
  33
  34 [[ -f /etc/os-release ]] && . /etc/os-release
  35
  36 if [[ ${KERNEL_INSTALL_MACHINE_ID+x} ]]; then
  37     MACHINE_ID=$KERNEL_INSTALL_MACHINE_ID
  38 elif [[ -f /etc/machine-id ]] ; then
  39     read MACHINE_ID < /etc/machine-id
  40 fi
  41
  42 if ! [[ $MACHINE_ID ]]; then
  43     exit 0
  44 fi
  45
  46 if [[ -f /etc/kernel/cmdline ]]; then
  47     read -r -d '' -a BOOT_OPTIONS < /etc/kernel/cmdline
  48 elif [[ -f /usr/lib/kernel/cmdline ]]; then
  49     read -r -d '' -a BOOT_OPTIONS < /usr/lib/kernel/cmdline
  50 fi
  51
  52 if ! [[ "${BOOT_OPTIONS[@]}" ]]; then
  53     read -r -d '' -a line < /proc/cmdline
  54     for i in "${line[@]}"; do
  55         [[ "${i#initrd=*}" != "$i" ]] && continue
  56         BOOT_OPTIONS+=("$i")
  57     done
  58 fi
  59
  60 if ! [[ ${BOOT_OPTIONS[*]} ]]; then
  61     echo "Could not determine the kernel command line parameters." >&2
  62     echo "Please specify the kernel command line in /etc/kernel/cmdline!" >&2
  63     exit 1
  64 fi
  65
  66 BOOT_DIR="/${MACHINE_ID}/0-rescue"
  67 BOOT_ROOT=${BOOT_DIR_ABS%$BOOT_DIR}
  68 LOADER_ENTRY="$BOOT_ROOT/loader/entries/${MACHINE_ID}-0-rescue.conf"
  69
  70 ret=0
  71
  72 case "$COMMAND" in
  73     add)
  74         [[ -f "$LOADER_ENTRY" ]] && exit 0
  75
  76         # source our config dir
  77         for f in $(dropindirs_sort ".conf" "/etc/dracut.conf.d" "/usr/lib/dracut/dracut.conf.d"); do
  78             [[ -e $f ]] && . "$f"
  79         done
  80
  81         [[ $dracut_rescue_image != "yes" ]] && exit 0
  82
  83         [[ -d "$BOOT_DIR_ABS" ]] || mkdir -p "$BOOT_DIR_ABS"
  84
  85         if ! cp --reflink=auto "$KERNEL_IMAGE" "$BOOT_DIR_ABS"/linux; then
  86             echo "Can't copy '$KERNEL_IMAGE to '$BOOT_DIR_ABS/linux'!" >&2
  87         fi
  88
  89         dracut --no-hostonly -a "rescue" "$BOOT_DIR_ABS"/initrd "$KERNEL_VERSION"
  90         ((ret+=$?))
  91
  92         {
  93             echo "title      $PRETTY_NAME - Rescue Image"
  94             echo "version    $KERNEL_VERSION"
  95             echo "machine-id $MACHINE_ID"
  96             echo "options    ${BOOT_OPTIONS[@]} rd.auto=1"
  97             echo "linux      $BOOT_DIR/linux"
  98             echo "initrd     $BOOT_DIR/initrd"
  99         } > $LOADER_ENTRY
 100         ((ret+=$?))
 101         ;;
 102
 103     remove)
 104         exit 0
 105         ;;
 106
 107     *)
 108         usage
 109         ret=1;;
 110 esac
 111
 112 ((ret+=$?))
 113
 114 exit $ret