debian/live-initramfs.init

   1 #!/bin/sh
   2
   3 ### BEGIN INIT INFO
   4 # Provides:             live-initramfs
   5 # Required-Start:       $syslog
   6 # Required-Stop:
   7 # Should-Start:         $local_fs
   8 # Should-Stop:          halt reboot
   9 # X-Stop-After:         umountroot
  10 # Default-Start:
  11 # Default-Stop:         0 6
  12 # Short-Description:    live-initramfs init script
  13 # Description:          Resyncs snapshots, evantually caches files in order to
  14 #                       let remove the media.
  15 ### END INIT INFO
  16
  17 # Authors: Tollef Fog Heen <tfheen@canonical.com>
  18 #          Marco Amadori <marco.amadori@gmail.com>
  19
  20 PATH=/usr/sbin:/usr/bin:/sbin:/bin
  21 NAME=live-initramfs
  22 SCRIPTNAME=/etc/init.d/${NAME}
  23 DO_SNAPSHOT=/sbin/live-snapshot
  24
  25 # Exit if system was not booted by live-initramfs
  26 grep -qs boot=live /proc/cmdline || exit 0
  27
  28 # Exit if the system was booted from an ISO image rather than a physical CD
  29 grep -qs find_iso= /proc/cmdline && exit 0
  30
  31 # Read configuration variable file if it is present
  32 [ -r /etc/live.conf ] && . /etc/live.conf
  33
  34 # Load the VERBOSE setting and other rcS variables
  35 [ -f /etc/default/rcS ] && . /etc/default/rcS
  36
  37 # Define LSB log_* functions.
  38 # Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
  39 . /lib/lsb/init-functions
  40
  41 # Try to cache everything we're likely to need after ejecting.  This
  42 # is fragile and simple-minded, but our options are limited.
  43 cache_path()
  44 {
  45         path="${1}"
  46
  47         if [ -d "${path}" ]
  48         then
  49                 find "${path}" -type f | xargs cat > /dev/null 2>&1
  50         elif [ -f "${path}" ]
  51         then
  52                 if [ -x "${path}" ]
  53                 then
  54                         if file "${path}" | grep -q 'dynamically linked'
  55                         then
  56                                 for lib in $(ldd "${path}" | awk '{ print $3 }')
  57                                 do
  58                                         cache_path "${lib}"
  59                                 done
  60                         fi
  61                 fi
  62
  63                 cat "${path}" >/dev/null 2>&1
  64         fi
  65 }
  66
  67 get_boot_device()
  68 {
  69         # search in /proc/mounts for the device that is mounted at /live/image
  70         while read DEVICE MOUNT REST
  71         do
  72                 if [ "${MOUNT}" = "/live/image" ]
  73                 then
  74                         echo "${DEVICE}"
  75                         exit 0
  76                 fi
  77         done < /proc/mounts
  78 }
  79
  80 device_is_USB_flash_drive()
  81 {
  82         # remove leading "/dev/" and all trailing numbers from input
  83         DEVICE=$(expr substr ${1} 6 3)
  84
  85         # check that device starts with "sd"
  86         [ "$(expr substr ${DEVICE} 1 2)" != "sd" ] && return 1
  87
  88         # check that the device is an USB device
  89         if readlink /sys/block/${DEVICE} | grep -q usb ||
  90            readlink /sys/block/${DEVICE}/device | grep -q usb # linux < 2.6.29
  91         then
  92                 return 0
  93         fi
  94
  95         return 1
  96 }
  97
  98 do_stop ()
  99 {
 100         if ! grep -qs nopersistent /proc/cmdline && grep -qs persistent /proc/cmdline
 101         then
 102                 if [ ! -z "${ROOTSNAP}" ]
 103                 then
 104                         ${DO_SNAPSHOT} --resync-string="${ROOTSNAP}"
 105                 fi
 106
 107                 if [ ! -z "${HOMESNAP}" ]
 108                 then
 109                         ${DO_SNAPSHOT} --resync-string="${HOMESNAP}"
 110                 fi
 111         fi
 112
 113         # check for netboot
 114         if [ ! -z "${NETBOOT}" ] || grep -qs netboot /proc/cmdline || grep -qsi root=/dev/nfs /proc/cmdline  || grep -qsi root=/dev/cifs /proc/cmdline
 115         then
 116                 return 0
 117         fi
 118
 119         prompt=1
 120         if grep -qs noprompt /proc/cmdline
 121         then
 122                 prompt=
 123         fi
 124
 125         for path in $(which halt) $(which reboot) /etc/rc?.d /etc/default $(which stty)
 126         do
 127                 cache_path "${path}"
 128         done
 129
 130         for x in $(cat /proc/cmdline)
 131         do
 132                 case ${x} in
 133                         quickreboot)
 134                                 QUICKREBOOT="Yes"
 135                                 ;;
 136                 esac
 137         done
 138
 139         if [ -z ${QUICKREBOOT} ]
 140         then
 141                 # TODO: i18n
 142                 BOOT_DEVICE="$(get_boot_device)"
 143
 144                 if device_is_USB_flash_drive ${BOOT_DEVICE}
 145                 then
 146                         # do NOT eject USB flash drives!
 147                         # otherwise rebooting with most USB flash drives
 148                         # failes because they actually remember the
 149                         # "ejected" state even after reboot
 150                         MESSAGE="Please remove the USB flash drive"
 151                 else
 152                         # ejecting is a very good idea here
 153                         MESSAGE="Please remove the disc, close the the tray (if any)"
 154
 155                         if [ -x /usr/bin/eject ]
 156                         then
 157                                 eject -p -m /live/image >/dev/null 2>&1
 158                         fi
 159
 160                 fi
 161
 162                 [ "$prompt" ] || return 0
 163
 164                 stty sane < /dev/console
 165
 166                 printf "\n\n${MESSAGE} and press ENTER to continue:" > /dev/console
 167
 168                 if [ -x /sbin/usplash_write ]
 169                 then
 170                         /sbin/usplash_write "TIMEOUT 86400"
 171                         /sbin/usplash_write "TEXT-URGENT ${MESSAGE}"
 172                         /sbin/usplash_write "TEXT-URGENT and press ENTER to continue"
 173                 fi
 174
 175                 read x < /dev/console
 176         fi
 177 }
 178
 179 case "${1}" in
 180         restart|reload|force-reload|status)
 181                 [ "${VERBOSE}" != no ] && log_end_msg 0
 182                 ;;
 183
 184         start|stop)
 185                 log_begin_msg "${NAME} is resyncing snapshots and caching reboot files..."
 186                 do_stop
 187
 188                 case "${?}" in
 189                         0|1)
 190                                 [ "${VERBOSE}" != no ] && log_end_msg 0
 191                                 ;;
 192
 193                         2)
 194                                 [ "${VERBOSE}" != no ] && log_end_msg 1
 195                                 ;;
 196                 esac
 197
 198                 mount -o remount,ro /live/cow
 199                 ;;
 200
 201         *)
 202                 log_success_msg "Usage: ${SCRIPTNAME} {start|stop|restart|force-reload}" >&2
 203                 exit 3
 204                 ;;
 205 esac