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                                 LIVE_READ_ONLY_DEVICES="${_PARAMETER#*read-only=}"
  13                                 ;;
  14
  15                         live-boot.read-only|read-only)
  16                                 LIVE_READ_ONLY="true"
  17                                 ;;
  18                 esac
  19         done
  20
  21         if [ "${LIVE_READ_ONLY}" != "true" ]
  22         then
  23                 return 0
  24         fi
  25
  26         # Marking some block devices as read-only to ensure that nothing
  27         # gets written as linux still writes to 'only' read-only mounted filesystems.
  28         LIVE_READ_ONLY_DEVICES="${LIVE_READ_ONLY_DEVICES:-/dev/sd* /dev/vd*}"
  29
  30         for _DEVICE in $(echo ${LIVE_READ_ONLY_DEVICES} | sed -e 's|,| |g')
  31         do
  32                 if [ ! -b "${_DEVICE}" ]
  33                 then
  34                         continue
  35                 fi
  36
  37                 echo -n "live-boot: Setting ${_DEVICE} read-only..." > /dev/console
  38
  39                 blockdev --setro ${_DEVICE}
  40                 _RETURN="${?}"
  41
  42                 case "${_RETURN}" in
  43                         0)
  44                                 echo " done, use 'blockdev --setrw ${_DEVICE}' to set read-write." > /dev/console
  45                                 ;;
  46
  47                         *)
  48                                 echo " failed." > /dev/console
  49                                 ;;
  50                 esac
  51         done
  52 }