bin/boot-init.sh

   1 #!/bin/sh
   2
   3 ## live-config(7) - System Configuration Scripts
   4 ## Copyright (C) 2006-2012 Daniel Baumann <daniel@debian.org>
   5 ##
   6 ## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
   7 ## This is free software, and you are welcome to redistribute it
   8 ## under certain conditions; see COPYING for details.
   9
  10
  11 set -e
  12
  13 # Exit if system is not a live system
  14 if ! grep -qs "boot=live" /proc/cmdline || \
  15 # Exit if system is netboot
  16    grep -qs "netboot" /proc/cmdline || \
  17    grep -qs "root=/dev/nfs" /proc/cmdline || \
  18    grep -qs "root=/dev/cifs" /proc/cmdline || \
  19 # Exit if system is toram
  20    grep -qs "toram" /proc/cmdline
  21 then
  22         exit 0
  23 fi
  24
  25
  26
  27 # Try to cache everything we're likely to need after ejecting.  This
  28 # is fragile and simple-minded, but our options are limited.
  29 cache_path()
  30 {
  31         path="${1}"
  32
  33         if [ -d "${path}" ]
  34         then
  35                 find "${path}" -type f | xargs cat > /dev/null 2>&1
  36         elif [ -f "${path}" ]
  37         then
  38                 if file -L "${path}" | grep -q 'dynamically linked'
  39                 then
  40                         # ldd output can be of three forms:
  41                         # 1. linux-vdso.so.1 =>  (0x00007fffe3fb4000)
  42                         #    This is a virtual, kernel shared library and we want to skip it
  43                         # 2. libc.so.6 => /lib/libc.so.6 (0x00007f5e9dc0c000)
  44                         #    We want to cache the third word.
  45                         # 3. /lib64/ld-linux-x86-64.so.2 (0x00007f5e9df8b000)
  46                         #    We want to cache the first word.
  47                         ldd "${path}" | while read line
  48                         do
  49                                 if echo "$line" | grep -qs ' =>  '
  50                                 then
  51                                         continue
  52                                 elif echo "$line" | grep -qs ' => '
  53                                 then
  54                                         lib=$(echo "${line}" | awk '{ print $3 }')
  55                                 else
  56                                         lib=$(echo "${line}" | awk '{ print $1 }')
  57                                 fi
  58                                 cache_path "${lib}"
  59                         done
  60                 fi
  61
  62                 cat "${path}" >/dev/null 2>&1
  63         fi
  64 }
  65
  66 get_boot_device()
  67 {
  68         # search in /proc/mounts for the device that is mounted at /lib/live/mount/medium
  69         while read DEVICE MOUNT REST
  70         do
  71                 if [ "${MOUNT}" = "/lib/live/mount/medium" ]
  72                 then
  73                         echo "${DEVICE}"
  74                         exit 0
  75                 fi
  76         done < /proc/mounts
  77 }
  78
  79 device_is_USB_flash_drive()
  80 {
  81         # remove leading "/dev/" and all trailing numbers from input
  82         DEVICE=$(expr substr ${1} 6 3)
  83
  84         # check that device starts with "sd"
  85         [ "$(expr substr ${DEVICE} 1 2)" != "sd" ] && return 1
  86
  87         # check that the device is an USB device
  88         if readlink /sys/block/${DEVICE} | grep -q usb
  89         then
  90                 return 0
  91         fi
  92
  93         return 1
  94 }
  95
  96 Eject ()
  97 {
  98         # TODO: i18n
  99         BOOT_DEVICE="$(get_boot_device)"
 100
 101         if device_is_USB_flash_drive ${BOOT_DEVICE}
 102         then
 103                 # do NOT eject USB flash drives!
 104                 # otherwise rebooting with most USB flash drives
 105                 # failes because they actually remember the
 106                 # "ejected" state even after reboot
 107                 MESSAGE="Please remove the USB flash drive"
 108
 109                 if [ "${NOPROMPT}" = "usb" ]
 110                 then
 111                         prompt=
 112                 fi
 113
 114         else
 115                 # ejecting is a very good idea here
 116                 MESSAGE="Please remove the disc, close the tray (if any)"
 117
 118                 if [ -x /usr/bin/eject ]
 119                 then
 120                         eject -p -m /lib/live/mount/medium >/dev/null 2>&1
 121                 fi
 122
 123                 if [ "${NOPROMPT}" = "cd" ]
 124                 then
 125                         prompt=
 126                 fi
 127         fi
 128
 129         [ "$prompt" ] || return 0
 130
 131         if [ -x /bin/plymouth ] && plymouth --ping
 132         then
 133                 plymouth message --text="${MESSAGE} and press ENTER to continue:"
 134                 plymouth watch-keystroke > /dev/null
 135         else
 136                 stty sane < /dev/console
 137
 138                 printf "\n\n${MESSAGE} and press ENTER to continue:" > /dev/console
 139
 140                 read x < /dev/console
 141         fi
 142 }
 143
 144 echo "live-boot: caching reboot files..."
 145
 146 prompt=1
 147 if [ "${NOPROMPT}" = "Yes" ]
 148 then
 149         prompt=
 150 fi
 151
 152 for path in $(which halt) $(which reboot) /etc/rc?.d /etc/default $(which stty) /bin/plymouth
 153 do
 154         cache_path "${path}"
 155 done
 156
 157 mount -o remount,ro /lib/live/mount/overlay > /dev/null 2>&1
 158
 159 # Remounting any persistence devices read-only
 160 for _MOUNT in $(awk '/\/lib\/live\/mount\/persistence/ { print $2 }' /proc/mounts)
 161 do
 162         mount -o remount,ro ${_MOUNT} > /dev/null 2>&1
 163 done
 164
 165 # Flush filesystem buffers
 166 sync
 167
 168 # Check if we need to eject the drive
 169 if grep -qs "cdrom-detect/eject=false" /proc/cmdline || \
 170    grep -qs "noeject" /proc/cmdline || \
 171    grep -qs "find_iso" /proc/cmdline
 172 then
 173         return
 174 else
 175         Eject
 176 fi