debian/live-boot.init

   1 #!/bin/sh
   2
   3 ### BEGIN INIT INFO
   4 # Provides:             live-boot
   5 # Required-Start:       $syslog bootmisc
   6 # Required-Stop:
   7 # Should-Start:         $local_fs
   8 # Should-Stop:          halt reboot
   9 # X-Stop-After:         umountroot
  10 # Default-Start:        S
  11 # Default-Stop:         0 6
  12 # Short-Description:    live-boot init script
  13 # Description:          Resyncs snapshots, evantually caches files in order to
  14 #                       let remove the media.
  15 ### END INIT INFO
  16
  17 # Authors: Tollef Fog Heen <tfheen@canonical.com>
  18 #          Marco Amadori <marco.amadori@gmail.com>
  19
  20 PATH=/usr/sbin:/usr/bin:/sbin:/bin
  21 NAME=live-boot
  22 SCRIPTNAME=/etc/init.d/${NAME}
  23 DO_SNAPSHOT=/sbin/live-snapshot
  24 SNAPSHOT_CONF="/etc/live/boot.d/snapshot.conf"
  25
  26 # Exit if system was not booted by live-boot
  27 grep -qs boot=live /proc/cmdline || exit 0
  28
  29 # Read snapshot configuration variables
  30 [ -r ${SNAPSHOT_CONF} ] && . ${SNAPSHOT_CONF}
  31
  32 # Load the VERBOSE setting and other rcS variables
  33 [ -f /etc/default/rcS ] && . /etc/default/rcS
  34
  35 # Define LSB log_* functions.
  36 # Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
  37 . /lib/lsb/init-functions
  38
  39 # Try to cache everything we're likely to need after ejecting.  This
  40 # is fragile and simple-minded, but our options are limited.
  41 cache_path()
  42 {
  43         path="${1}"
  44
  45         if [ -d "${path}" ]
  46         then
  47                 find "${path}" -type f | xargs cat > /dev/null 2>&1
  48         elif [ -f "${path}" ]
  49         then
  50                 if [ -x "${path}" ]
  51                 then
  52                         if file -L "${path}" | grep -q 'dynamically linked'
  53                         then
  54                                 for lib in $(ldd "${path}" | awk '{ print $3 }')
  55                                 do
  56                                         cache_path "${lib}"
  57                                 done
  58                         fi
  59                 fi
  60
  61                 cat "${path}" >/dev/null 2>&1
  62         fi
  63 }
  64
  65 get_boot_device()
  66 {
  67         # search in /proc/mounts for the device that is mounted at /live/image
  68         while read DEVICE MOUNT REST
  69         do
  70                 if [ "${MOUNT}" = "/live/image" ]
  71                 then
  72                         echo "${DEVICE}"
  73                         exit 0
  74                 fi
  75         done < /proc/mounts
  76 }
  77
  78 device_is_USB_flash_drive()
  79 {
  80         # remove leading "/dev/" and all trailing numbers from input
  81         DEVICE=$(expr substr ${1} 6 3)
  82
  83         # check that device starts with "sd"
  84         [ "$(expr substr ${DEVICE} 1 2)" != "sd" ] && return 1
  85
  86         # check that the device is an USB device
  87         if readlink /sys/block/${DEVICE} | grep -q usb ||
  88            readlink /sys/block/${DEVICE}/device | grep -q usb # linux < 2.6.29
  89         then
  90                 return 0
  91         fi
  92
  93         return 1
  94 }
  95
  96 do_stop ()
  97 {
  98         if ! grep -qs nopersistent /proc/cmdline && grep -qs persistent /proc/cmdline
  99         then
 100                 # ROOTSNAP and HOMESNAP are defined in ${SNAPSHOT_CONF} file
 101                 if [ ! -z "${ROOTSNAP}" ]
 102                 then
 103                         ${DO_SNAPSHOT} --resync-string="${ROOTSNAP}"
 104                 fi
 105
 106                 if [ ! -z "${HOMESNAP}" ]
 107                 then
 108                         ${DO_SNAPSHOT} --resync-string="${HOMESNAP}"
 109                 fi
 110         fi
 111
 112         # check for netboot
 113         if [ ! -z "${NETBOOT}" ] || grep -qs netboot /proc/cmdline || grep -qsi root=/dev/nfs /proc/cmdline  || grep -qsi root=/dev/cifs /proc/cmdline
 114         then
 115                 return 0
 116         fi
 117
 118         # check for toram
 119         if grep -qs toram /proc/cmdline
 120         then
 121                 return 0
 122         fi
 123
 124         # Don't prompt to eject the SD card on Babbage board, where we reuse it
 125         # as a quasi-boot-floppy. Technically this uses a bit of ubiquity
 126         # (archdetect), but since this is mostly only relevant for
 127         # installations, who cares ...
 128         if type archdetect >/dev/null 2>&1
 129         then
 130                 subarch="$(archdetect)"
 131
 132                 case $subarch in
 133                         arm*/imx51)
 134                                 return 0
 135                                 ;;
 136                 esac
 137         fi
 138
 139         prompt=1
 140         if grep -qs noprompt /proc/cmdline
 141         then
 142                 prompt=
 143         fi
 144
 145         for path in $(which halt) $(which reboot) /etc/rc?.d /etc/default $(which stty) /bin/plymouth
 146         do
 147                 cache_path "${path}"
 148         done
 149
 150         for x in $(cat /proc/cmdline)
 151         do
 152                 case ${x} in
 153                         quickreboot)
 154                                 QUICKREBOOT="Yes"
 155                                 ;;
 156                 esac
 157         done
 158
 159         mount -o remount,ro /live/cow
 160
 161         if [ -z ${QUICKREBOOT} ]
 162         then
 163
 164                 # Exit if the system was booted from an ISO image rather than a physical CD
 165                 grep -qs find_iso= /proc/cmdline && return 0
 166                 # TODO: i18n
 167                 BOOT_DEVICE="$(get_boot_device)"
 168
 169                 if device_is_USB_flash_drive ${BOOT_DEVICE}
 170                 then
 171                         # do NOT eject USB flash drives!
 172                         # otherwise rebooting with most USB flash drives
 173                         # failes because they actually remember the
 174                         # "ejected" state even after reboot
 175                         MESSAGE="Please remove the USB flash drive"
 176                 else
 177                         # ejecting is a very good idea here
 178                         MESSAGE="Please remove the disc, close the tray (if any)"
 179
 180                         if [ -x /usr/bin/eject ]
 181                         then
 182                                 eject -p -m /live/image >/dev/null 2>&1
 183                         fi
 184
 185                 fi
 186
 187                 [ "$prompt" ] || return 0
 188
 189                 if [ -x /bin/plymouth ] && plymouth --ping
 190                 then
 191                         plymouth message --text="${MESSAGE} and press ENTER to continue:"
 192                         plymouth watch-keystroke > /dev/null
 193                 else
 194                         stty sane < /dev/console
 195
 196                         printf "\n\n${MESSAGE} and press ENTER to continue:" > /dev/console
 197
 198                         read x < /dev/console
 199                 fi
 200         fi
 201 }
 202
 203 case "${1}" in
 204         restart|reload|force-reload|status)
 205                 [ "${VERBOSE}" != no ] && log_end_msg 0
 206                 ;;
 207         start)
 208                 log_begin_msg "${NAME} is configuring sendsigs..."
 209                 if [ -f /live/root.pid ] ; then
 210                         cat /live/root.pid >> /var/run/sendsigs.omit
 211                 fi
 212                 log_end_msg 0
 213                 ;;
 214
 215         stop)
 216                 log_begin_msg "${NAME} is resyncing snapshots and caching reboot files..."
 217                 do_stop
 218
 219                 case "${?}" in
 220                         0|1)
 221                                 [ "${VERBOSE}" != no ] && log_end_msg 0
 222                                 ;;
 223
 224                         2)
 225                                 [ "${VERBOSE}" != no ] && log_end_msg 1
 226                                 ;;
 227                 esac
 228                 ;;
 229
 230         *)
 231                 log_success_msg "Usage: ${SCRIPTNAME} {start|stop|restart|force-reload}" >&2
 232                 exit 3
 233                 ;;
 234 esac