debian/local/extlinux-install

   1 #!/bin/sh
   2
   3 ## Copyright (C) 2006-2013 Daniel Baumann <mail@daniel-baumann.ch>
   4 ##
   5 ## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
   6 ## This is free software, and you are welcome to redistribute it
   7 ## under certain conditions; see COPYING for details.
   8
   9
  10 set -e
  11
  12 _DEVICE="${1}"
  13
  14 # Exit if user has not specified a device to install
  15 if [ -z "${_DEVICE}" ]
  16 then
  17         echo "E: Usage: ${0} DEVICE"
  18         exit 1
  19 else
  20         shift
  21 fi
  22
  23 _DIRECTORY="/boot/extlinux"
  24
  25 # Exit if user is unprivileged
  26 if [ "$(id -u)" -ne 0 ]
  27 then
  28         echo "E: need root privileges"
  29         exit 1
  30 fi
  31
  32 # Exit if user has specified a non-existing device
  33 if [ ! -e "${_DEVICE}" ]
  34 then
  35         echo "E: cannot access \"${_DEVICE}\": No such device"
  36         exit 1
  37 fi
  38
  39 # Exit if user has specified an invalid device
  40 if [ ! -b "${_DEVICE}" ]
  41 then
  42         echo "E: cannot access \"${_DEVICE}\": No valid device"
  43         exit 1
  44 fi
  45
  46 # Checking extlinux directory
  47 echo -n "P: Checking for EXTLINUX directory..."
  48
  49 # Creating extlinux directory
  50 if [ ! -e "${_DIRECTORY}" ]
  51 then
  52         echo " not found."
  53
  54         echo -n "P: Creating EXTLINUX directory..."
  55         mkdir -p "${_DIRECTORY}"
  56         echo " done: ${_DIRECTORY}"
  57 else
  58         echo " found."
  59 fi
  60
  61 _MBR="$(/sbin/blkid -s PART_ENTRY_SCHEME -p -o value ${_DEVICE})"
  62
  63 case "${_MBR}" in
  64         gpt)
  65                 _MBR="gptmbr"
  66                 ;;
  67
  68         *)
  69                 _MBR="mbr"
  70                 ;;
  71 esac
  72
  73 # Searching syslinux MBR
  74 if [ ! -e /usr/lib/EXTLINUX/${_MBR}.bin ]
  75 then
  76         echo "E: /usr/lib/EXTLINUX/${_MBR}.bin: No such file"
  77         exit 1
  78 fi
  79
  80 # Saving old MBR
  81 echo -n "P: Saving old ${_MBR}..."
  82 dd if="${_DEVICE}" of=/boot/${_MBR}-$(basename "${_DEVICE}").old bs=440 count=1 conv=notrunc 2> /dev/null
  83 echo " done: /boot/${_MBR}-$(basename "${_DEVICE}").old"
  84
  85 # Writing syslinux MBR
  86 echo -n "P: Writing new ${_MBR}..."
  87 dd if=/usr/lib/EXTLINUX/${_MBR}.bin of="${_DEVICE}" bs=440 count=1 conv=notrunc 2> /dev/null
  88 echo " done: ${_DEVICE}"
  89
  90 # Writing extlinux loader
  91 echo "P: Installing EXTLINUX..."
  92 extlinux --install "${_DIRECTORY}" ${@}