bin/boot.sh

   1 #!/bin/sh
   2
   3 PATH=/usr/sbin:/usr/bin:/sbin:/bin
   4 NAME=live-boot
   5 SCRIPTNAME=/etc/init.d/${NAME}
   6 DO_SNAPSHOT=/sbin/live-snapshot
   7 SNAPSHOT_CONF="/etc/live/boot.d/snapshot.conf"
   8
   9 # Exit if system was not booted by live-boot
  10 grep -qs boot=live /proc/cmdline || exit 0
  11
  12 # Read snapshot configuration variables
  13 [ -r ${SNAPSHOT_CONF} ] && . ${SNAPSHOT_CONF}
  14
  15 # Load the VERBOSE setting and other rcS variables
  16 [ -f /etc/default/rcS ] && . /etc/default/rcS
  17
  18 # Define LSB log_* functions.
  19 # Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
  20 . /lib/lsb/init-functions
  21
  22 # Try to cache everything we're likely to need after ejecting.  This
  23 # is fragile and simple-minded, but our options are limited.
  24 cache_path()
  25 {
  26         path="${1}"
  27
  28         if [ -d "${path}" ]
  29         then
  30                 find "${path}" -type f | xargs cat > /dev/null 2>&1
  31         elif [ -f "${path}" ]
  32         then
  33                 if file -L "${path}" | grep -q 'dynamically linked'
  34                 then
  35                         # ldd output can be of three forms:
  36                         # 1. linux-vdso.so.1 =>  (0x00007fffe3fb4000)
  37                         #    This is a virtual, kernel shared library and we want to skip it
  38                         # 2. libc.so.6 => /lib/libc.so.6 (0x00007f5e9dc0c000)
  39                         #    We want to cache the third word.
  40                         # 3. /lib64/ld-linux-x86-64.so.2 (0x00007f5e9df8b000)
  41                         #    We want to cache the first word.
  42                         ldd "${path}" | while read line
  43                         do
  44                                 if echo "$line" | grep -qs ' =>  '
  45                                 then
  46                                         continue
  47                                 elif echo "$line" | grep -qs ' => '
  48                                 then
  49                                         lib=$(echo "${line}" | awk '{ print $3 }')
  50                                 else
  51                                         lib=$(echo "${line}" | awk '{ print $1 }')
  52                                 fi
  53                                 cache_path "${lib}"
  54                         done
  55                 fi
  56
  57                 cat "${path}" >/dev/null 2>&1
  58         fi
  59 }
  60
  61 get_boot_device()
  62 {
  63         # search in /proc/mounts for the device that is mounted at /live/image
  64         while read DEVICE MOUNT REST
  65         do
  66                 if [ "${MOUNT}" = "/live/image" ]
  67                 then
  68                         echo "${DEVICE}"
  69                         exit 0
  70                 fi
  71         done < /proc/mounts
  72 }
  73
  74 device_is_USB_flash_drive()
  75 {
  76         # remove leading "/dev/" and all trailing numbers from input
  77         DEVICE=$(expr substr ${1} 6 3)
  78
  79         # check that device starts with "sd"
  80         [ "$(expr substr ${DEVICE} 1 2)" != "sd" ] && return 1
  81
  82         # check that the device is an USB device
  83         if readlink /sys/block/${DEVICE} | grep -q usb
  84         then
  85                 return 0
  86         fi
  87
  88         return 1
  89 }
  90
  91 do_stop ()
  92 {
  93         if ! grep -qs nopersistent /proc/cmdline && grep -qs persistent /proc/cmdline
  94         then
  95                 # ROOTSNAP and HOMESNAP are defined in ${SNAPSHOT_CONF} file
  96                 if [ ! -z "${ROOTSNAP}" ]
  97                 then
  98                         ${DO_SNAPSHOT} --resync-string="${ROOTSNAP}"
  99                 fi
 100
 101                 if [ ! -z "${HOMESNAP}" ]
 102                 then
 103                         ${DO_SNAPSHOT} --resync-string="${HOMESNAP}"
 104                 fi
 105         fi
 106
 107         # check for netboot
 108         if [ ! -z "${NETBOOT}" ] || grep -qs netboot /proc/cmdline || grep -qsi root=/dev/nfs /proc/cmdline  || grep -qsi root=/dev/cifs /proc/cmdline
 109         then
 110                 return 0
 111         fi
 112
 113         # check for toram
 114         if grep -qs toram /proc/cmdline
 115         then
 116                 return 0
 117         fi
 118
 119         # Don't prompt to eject the SD card on Babbage board, where we reuse it
 120         # as a quasi-boot-floppy. Technically this uses a bit of ubiquity
 121         # (archdetect), but since this is mostly only relevant for
 122         # installations, who cares ...
 123         if type archdetect >/dev/null 2>&1
 124         then
 125                 subarch="$(archdetect)"
 126
 127                 case $subarch in
 128                         arm*/imx51)
 129                                 return 0
 130                                 ;;
 131                 esac
 132         fi
 133
 134         prompt=1
 135         if [ "${NOPROMPT}" = "Yes" ]
 136         then
 137                 prompt=
 138         fi
 139
 140         for path in $(which halt) $(which reboot) /etc/rc?.d /etc/default $(which stty) /bin/plymouth
 141         do
 142                 cache_path "${path}"
 143         done
 144
 145         for x in $(cat /proc/cmdline)
 146         do
 147                 case ${x} in
 148                         quickreboot)
 149                                 QUICKREBOOT="Yes"
 150                                 ;;
 151                 esac
 152         done
 153
 154         mount -o remount,ro /live/cow
 155
 156         if [ -z ${QUICKREBOOT} ]
 157         then
 158
 159                 # Exit if the system was booted from an ISO image rather than a physical CD
 160                 grep -qs find_iso= /proc/cmdline && return 0
 161                 # TODO: i18n
 162                 BOOT_DEVICE="$(get_boot_device)"
 163
 164                 if device_is_USB_flash_drive ${BOOT_DEVICE}
 165                 then
 166                         # do NOT eject USB flash drives!
 167                         # otherwise rebooting with most USB flash drives
 168                         # failes because they actually remember the
 169                         # "ejected" state even after reboot
 170                         MESSAGE="Please remove the USB flash drive"
 171
 172                         if [ "${NOPROMPT}" = "usb" ]
 173                         then
 174                                 prompt=
 175                         fi
 176
 177                 else
 178                         # ejecting is a very good idea here
 179                         MESSAGE="Please remove the disc, close the tray (if any)"
 180
 181                         if [ -x /usr/bin/eject ]
 182                         then
 183                                 eject -p -m /live/image >/dev/null 2>&1
 184                         fi
 185
 186                         if [ "${NOPROMPT}" = "cd" ]
 187                         then
 188                                 prompt=
 189                         fi
 190
 191                 fi
 192
 193                 [ "$prompt" ] || return 0
 194
 195                 if [ -x /bin/plymouth ] && plymouth --ping
 196                 then
 197                         plymouth message --text="${MESSAGE} and press ENTER to continue:"
 198                         plymouth watch-keystroke > /dev/null
 199                 else
 200                         stty sane < /dev/console
 201
 202                         printf "\n\n${MESSAGE} and press ENTER to continue:" > /dev/console
 203
 204                         read x < /dev/console
 205                 fi
 206         fi
 207 }
 208
 209 case "${1}" in
 210         start|restart|reload|force-reload|status)
 211                 [ "${VERBOSE}" != no ] && log_end_msg 0 || exit 0
 212                 ;;
 213
 214         stop)
 215                 log_begin_msg "${NAME} is resyncing snapshots and caching reboot files..."
 216                 do_stop
 217
 218                 case "${?}" in
 219                         0|1)
 220                                 [ "${VERBOSE}" != no ] && log_end_msg 0 || exit 0
 221                                 ;;
 222
 223                         2)
 224                                 [ "${VERBOSE}" != no ] && log_end_msg 1 || exit 1
 225                                 ;;
 226                 esac
 227                 ;;
 228
 229         *)
 230                 log_success_msg "Usage: ${SCRIPTNAME} {start|stop|restart|force-reload}" >&2
 231                 exit 3
 232                 ;;
 233 esac