debian/live-initramfs.init

   1 #!/bin/sh
   2
   3 ### BEGIN INIT INFO
   4 # Provides:             live-initramfs
   5 # Required-Start:       $syslog
   6 # Required-Stop:        $syslog
   7 # Should-Start:         $local_fs
   8 # Should-Stop:          $local_fs
   9 # Default-Start:        1 2 3 4 5
  10 # Default-Stop:         0 6
  11 # Short-Description:    live-initramfs init script
  12 # Description:          Resyncs snapshots, evantually caches files in order to
  13 #                       let remove the media.
  14 ### END INIT INFO
  15
  16 # Authors: Tollef Fog Heen <tfheen@canonical.com>
  17 #          Marco Amadori <marco.amadori@gmail.com>
  18
  19 PATH=/usr/sbin:/usr/bin:/sbin:/bin
  20 NAME=live-initramfs
  21 SCRIPTNAME=/etc/init.d/${NAME}
  22 DO_SNAPSHOT=/sbin/live-snapshot
  23
  24 # Exit if system was not booted by live-initramfs
  25 grep -qs boot=live /proc/cmdline || exit 0
  26
  27 # Exit if the system was booted from an ISO image rather than a physical CD
  28 grep -qs find_iso= /proc/cmdline && exit 0
  29
  30 # Read configuration variable file if it is present
  31 [ -r /etc/live.conf ] && . /etc/live.conf
  32
  33 # Load the VERBOSE setting and other rcS variables
  34 [ -f /etc/default/rcS ] && . /etc/default/rcS
  35
  36 # Define LSB log_* functions.
  37 # Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
  38 . /lib/lsb/init-functions
  39
  40 # Try to cache everything we're likely to need after ejecting.  This
  41 # is fragile and simple-minded, but our options are limited.
  42 cache_path()
  43 {
  44         path="${1}"
  45
  46         if [ -d "${path}" ]
  47         then
  48                 find "${path}" -type f | xargs cat > /dev/null 2>&1
  49         elif [ -f "${path}" ]
  50         then
  51                 if [ -x "${path}" ]
  52                 then
  53                         if file "${path}" | grep -q 'dynamically linked'
  54                         then
  55                                 for lib in $(ldd "${path}" | awk '{ print $3 }')
  56                                 do
  57                                         cache_path "${lib}"
  58                                 done
  59                         fi
  60                 fi
  61
  62                 cat "${path}" >/dev/null 2>&1
  63         fi
  64 }
  65
  66 get_boot_device()
  67 {
  68         # search in /proc/mounts for the device that is mounted at /live/image
  69         while read DEVICE MOUNT REST
  70         do
  71                 if [ "${MOUNT}" = "/live/image" ]
  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}/device | grep -q usb
  89         then
  90                 return 0
  91         fi
  92
  93         return 1
  94 }
  95
  96 do_stop ()
  97 {
  98         if [ ! -z "${ROOTSNAP}" ]
  99         then
 100                 ${DO_SNAPSHOT} --resync-string="${ROOTSNAP}"
 101         fi
 102
 103         if [ ! -z "${HOMESNAP}" ]
 104         then
 105                 ${DO_SNAPSHOT} --resync-string="${HOMESNAP}"
 106         fi
 107
 108         # check for netboot
 109         if [ ! -z "${NETBOOT}" ] || grep -qs netboot /proc/cmdline || grep -qsi root=/dev/nfs /proc/cmdline  || grep -qsi root=/dev/cifs /proc/cmdline
 110         then
 111                 return 0
 112         fi
 113
 114         prompt=1
 115         if grep -qs noprompt /proc/cmdline
 116         then
 117                 prompt=
 118         fi
 119
 120         for path in $(which halt) $(which reboot) /etc/rc?.d /etc/default $(which stty)
 121         do
 122                 cache_path "${path}"
 123         done
 124
 125         for x in $(cat /proc/cmdline)
 126         do
 127                 case ${x} in
 128                         quickreboot)
 129                                 QUICKREBOOT="Yes"
 130                                 ;;
 131                 esac
 132         done
 133
 134         if [ -z ${QUICKREBOOT} ]
 135         then
 136                 # TODO: i18n
 137                 if [ -x /usr/bin/eject ]
 138                 then
 139                         BOOT_DEVICE="$(get_boot_device)"
 140
 141                         if device_is_USB_flash_drive ${BOOT_DEVICE}
 142                         then
 143                                 # do NOT eject USB flash drives!
 144                                 # otherwise rebooting with most USB flash drives
 145                                 # failes because they actually remember the
 146                                 # "ejected" state even after reboot
 147                                 MESSAGE="Please remove the USB flash drive"
 148                         else
 149                                 # ejecting is a very good idea here
 150                                 MESSAGE="Please remove the disc, close the the tray (if any)"
 151
 152                                 eject -p -m /live/image >/dev/null 2>&1
 153                         fi
 154
 155                         [ "$prompt" ] || return 0
 156                 fi
 157
 158                 stty sane < /dev/console
 159
 160                 echo -n -e "\n\n${MESSAGE} and press ENTER to continue:" > /dev/console
 161
 162                 if [ -x /sbin/usplash_write ]
 163                 then
 164                         /sbin/usplash_write "TIMEOUT 86400"
 165                         /sbin/usplash_write "TEXT-URGENT ${MESSAGE}"
 166                         /sbin/usplash_write "TEXT-URGENT and press ENTER to continue"
 167                 fi
 168
 169                 read x < /dev/console
 170         fi
 171 }
 172
 173 case "${1}" in
 174         start|restart|reload|force-reload|status)
 175                 [ "${VERBOSE}" != no ] && log_end_msg 0
 176                 ;;
 177
 178         stop)
 179                 log_begin_msg "${NAME} is resyncing snapshots and caching reboot files..."
 180                 do_stop
 181
 182                 case "${?}" in
 183                         0|1)
 184                                 [ "${VERBOSE}" != no ] && log_end_msg 0
 185                                 ;;
 186
 187                         2)
 188                                 [ "${VERBOSE}" != no ] && log_end_msg 1
 189                                 ;;
 190                 esac
 191                 ;;
 192
 193         *)
 194                 log_success_msg "Usage: ${SCRIPTNAME} {start|stop|restart|force-reload}" >&2
 195                 exit 3
 196                 ;;
 197 esac