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 [[ ! -f /etc/machine-id ]] || [[ ! -s /etc/machine-id ]]; then
  37     systemd-machine-id-setup
  38 fi
  39
  40 [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  41
  42 if [[ -f /etc/kernel/cmdline ]]; then
  43     read -r -d '' -a BOOT_OPTIONS < /etc/kernel/cmdline
  44 elif [[ -f /usr/lib/kernel/cmdline ]]; then
  45     read -r -d '' -a BOOT_OPTIONS < /usr/lib/kernel/cmdline
  46 fi
  47
  48 if ! [[ "${BOOT_OPTIONS[@]}" ]]; then
  49     read -r -d '' -a line < /proc/cmdline
  50     for i in "${line[@]}"; do
  51         [[ "${i#initrd=*}" != "$i" ]] && continue
  52         BOOT_OPTIONS+=("$i")
  53     done
  54 fi
  55
  56 if ! [[ ${BOOT_OPTIONS[*]} ]]; then
  57     echo "Could not determine the kernel command line parameters." >&2
  58     echo "Please specify the kernel command line in /etc/kernel/cmdline!" >&2
  59     exit 1
  60 fi
  61
  62 LOADER_ENTRY="/boot/loader/entries/${MACHINE_ID}-0-rescue.conf"
  63 BOOT_DIR="/${MACHINE_ID}/0-rescue"
  64
  65 ret=0
  66
  67 case "$COMMAND" in
  68     add)
  69         for i in "/boot/loader/entries/${MACHINE_ID}-0-rescue.conf"; do
  70             [[ -f $i ]] && exit 0
  71         done
  72
  73         # source our config dir
  74         for f in $(dropindirs_sort ".conf" "/etc/dracut.conf.d" "/usr/lib/dracut/dracut.conf.d"); do
  75             [[ -e $f ]] && . "$f"
  76         done
  77
  78         [[ $dracut_rescue_image != "yes" ]] && exit 0
  79
  80         [[ -d "$BOOT_DIR_ABS" ]] || mkdir -p "$BOOT_DIR_ABS"
  81
  82         if ! cp --reflink=auto "$KERNEL_IMAGE" "$BOOT_DIR_ABS"/linux; then
  83             echo "Can't copy '$KERNEL_IMAGE to '$BOOT_DIR_ABS/linux'!" >&2
  84         fi
  85
  86         dracut --no-hostonly -a "rescue" "$BOOT_DIR_ABS"/initrd "$KERNEL_VERSION"
  87         ((ret+=$?))
  88
  89         {
  90             echo "title      $PRETTY_NAME - Rescue Image"
  91             echo "version    $KERNEL_VERSION"
  92             echo "machine-id $MACHINE_ID"
  93             echo "options    ${BOOT_OPTIONS[@]} rd.auto=1"
  94             echo "linux      $BOOT_DIR/linux"
  95             echo "initrd     $BOOT_DIR/initrd"
  96         } > $LOADER_ENTRY
  97         ((ret+=$?))
  98         ;;
  99
 100     remove)
 101         exit 0
 102         ;;
 103
 104     *)
 105         usage
 106         ret=1;;
 107 esac
 108
 109 ((ret+=$?))
 110
 111 exit $ret