scripts/boot/0120-read-only

   1 #!/bin/sh
   2
   3 #set -e
   4
   5 Read_only ()
   6 {
   7         for _PARAMETER in ${_CMDLINE}
   8         do
   9                 case "${_PARAMETER}" in
  10                         live-boot.read-only|read-only)
  11                                 LIVE_READ_ONLY="true"
  12                                 ;;
  13                 esac
  14         done
  15
  16         if [ "${LIVE_READ_ONLY}" != "true" ]
  17         then
  18                 return 0
  19         fi
  20
  21         # Marking some block devices as read-only to ensure that nothing
  22         # gets written as linux still writes to 'only' read-only mounted filesystems.
  23         _DEVICES="/dev/sd* /dev/vd*"
  24
  25         for _DEVICE in ${_DEVICES}
  26         do
  27                 if [ ! -b "${_DEVICE}" ]
  28                 then
  29                         continue
  30                 fi
  31
  32                 echo -n "live-boot: Setting ${_DEVICE} read-only..." > /dev/console
  33
  34                 blockdev --setro ${_DEVICE}
  35                 _RETURN="${?}"
  36
  37                 case "${_RETURN}" in
  38                         0)
  39                                 echo " done, use 'blockdev --setrw ${_DEVICE}' to set read-write." > /dev/console
  40                                 ;;
  41
  42                         *)
  43                                 echo " failed." > /dev/console
  44                                 ;;
  45                 esac
  46         done
  47 }