debian/local/extlinux-install

   1 #!/bin/sh
   2
   3 set -e
   4
   5 _DEVICE="${1}"
   6
   7 # Exit if user has not specified a device to install
   8 if [ -z "${_DEVICE}" ]
   9 then
  10         echo "E: Usage: ${0} DEVICE"
  11         exit 1
  12 else
  13         shift
  14 fi
  15
  16 _DIRECTORY="/boot/extlinux"
  17
  18 # Exit if user is unprivileged
  19 if [ "$(id -u)" -ne 0 ]
  20 then
  21         echo "E: need root privileges"
  22         exit 1
  23 fi
  24
  25 # Exit if user has specified a non-existing device
  26 if [ ! -e "${_DEVICE}" ]
  27 then
  28         echo "E: cannot access \"${_DEVICE}\": No such device"
  29         exit 1
  30 fi
  31
  32 # Exit if user has specified an invalid device
  33 if [ ! -b "${_DEVICE}" ]
  34 then
  35         echo "E: cannot access \"${_DEVICE}\": No valid device"
  36         exit 1
  37 fi
  38
  39 # Checking extlinux directory
  40 echo -n "P: Checking for EXTLINUX directory..."
  41
  42 # Creating extlinux directory
  43 if [ ! -e "${_DIRECTORY}" ]
  44 then
  45         echo " not found."
  46
  47         echo -n "P: Creating EXTLINUX directory..."
  48         mkdir -p "${_DIRECTORY}"
  49         echo " done: ${_DIRECTORY}"
  50 else
  51         echo " found."
  52 fi
  53
  54 # Searching syslinux MBR
  55 if [ ! -e /usr/lib/extlinux/mbr.bin ]
  56 then
  57         echo "E: /usr/lib/extlinux/mbr.bin: No such file"
  58         exit 1
  59 fi
  60
  61 # Saving old MBR
  62 echo -n "P: Saving old MBR..."
  63 dd if="${_DEVICE}" of=/boot/mbr-$(basename "${_DEVICE}").old bs=440 count=1 2> /dev/null
  64 echo " done: /boot/mbr-$(basename "${_DEVICE}").old"
  65
  66 # Writing syslinux MBR
  67 echo -n "P: Writing new MBR..."
  68 dd if=/usr/lib/extlinux/mbr.bin of="${_DEVICE}" bs=440 count=1 2> /dev/null
  69 echo " done: ${_DEVICE}"
  70
  71 # Writing extlinux loader
  72 echo "P: Installing EXTLINUX..."
  73 extlinux --install "${_DIRECTORY}" ${@}