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|
#!/bin/sh
# Exit if system was not booted by live-boot
grep -qs boot=live /proc/cmdline || exit 0
DO_SNAPSHOT=/sbin/live-snapshot
SNAPSHOT_CONF="/etc/live/boot.d/snapshot.conf"
# Read snapshot configuration variables
[ -r ${SNAPSHOT_CONF} ] && . ${SNAPSHOT_CONF}
# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions
# Try to cache everything we're likely to need after ejecting. This
# is fragile and simple-minded, but our options are limited.
cache_path()
{
path="${1}"
if [ -d "${path}" ]
then
find "${path}" -type f | xargs cat > /dev/null 2>&1
elif [ -f "${path}" ]
then
if file -L "${path}" | grep -q 'dynamically linked'
then
# ldd output can be of three forms:
# 1. linux-vdso.so.1 => (0x00007fffe3fb4000)
# This is a virtual, kernel shared library and we want to skip it
# 2. libc.so.6 => /lib/libc.so.6 (0x00007f5e9dc0c000)
# We want to cache the third word.
# 3. /lib64/ld-linux-x86-64.so.2 (0x00007f5e9df8b000)
# We want to cache the first word.
ldd "${path}" | while read line
do
if echo "$line" | grep -qs ' => '
then
continue
elif echo "$line" | grep -qs ' => '
then
lib=$(echo "${line}" | awk '{ print $3 }')
else
lib=$(echo "${line}" | awk '{ print $1 }')
fi
cache_path "${lib}"
done
fi
cat "${path}" >/dev/null 2>&1
fi
}
get_boot_device()
{
# search in /proc/mounts for the device that is mounted at /live/image
while read DEVICE MOUNT REST
do
if [ "${MOUNT}" = "/live/image" ]
then
echo "${DEVICE}"
exit 0
fi
done < /proc/mounts
}
device_is_USB_flash_drive()
{
# remove leading "/dev/" and all trailing numbers from input
DEVICE=$(expr substr ${1} 6 3)
# check that device starts with "sd"
[ "$(expr substr ${DEVICE} 1 2)" != "sd" ] && return 1
# check that the device is an USB device
if readlink /sys/block/${DEVICE} | grep -q usb
then
return 0
fi
return 1
}
log_begin_msg "live-boot: resyncing snapshots and caching reboot files..."
if ! grep -qs nopersistent /proc/cmdline && grep -qs persistent /proc/cmdline
then
# ROOTSNAP and HOMESNAP are defined in ${SNAPSHOT_CONF} file
if [ ! -z "${ROOTSNAP}" ]
then
${DO_SNAPSHOT} --resync-string="${ROOTSNAP}"
fi
if [ ! -z "${HOMESNAP}" ]
then
${DO_SNAPSHOT} --resync-string="${HOMESNAP}"
fi
fi
# check for netboot
if [ ! -z "${NETBOOT}" ] || grep -qs netboot /proc/cmdline || grep -qsi root=/dev/nfs /proc/cmdline || grep -qsi root=/dev/cifs /proc/cmdline
then
return 0
fi
# check for toram
if grep -qs toram /proc/cmdline
then
return 0
fi
# Don't prompt to eject the SD card on Babbage board, where we reuse it
# as a quasi-boot-floppy. Technically this uses a bit of ubiquity
# (archdetect), but since this is mostly only relevant for
# installations, who cares ...
if type archdetect >/dev/null 2>&1
then
subarch="$(archdetect)"
case $subarch in
arm*/imx51)
return 0
;;
esac
fi
prompt=1
if [ "${NOPROMPT}" = "Yes" ]
then
prompt=
fi
for path in $(which halt) $(which reboot) /etc/rc?.d /etc/default $(which stty) /bin/plymouth
do
cache_path "${path}"
done
for x in $(cat /proc/cmdline)
do
case ${x} in
quickreboot)
QUICKREBOOT="Yes"
;;
esac
done
mount -o remount,ro /live/cow
if [ -z ${QUICKREBOOT} ]
then
# Exit if the system was booted from an ISO image rather than a physical CD
grep -qs find_iso= /proc/cmdline && return 0
# TODO: i18n
BOOT_DEVICE="$(get_boot_device)"
if device_is_USB_flash_drive ${BOOT_DEVICE}
then
# do NOT eject USB flash drives!
# otherwise rebooting with most USB flash drives
# failes because they actually remember the
# "ejected" state even after reboot
MESSAGE="Please remove the USB flash drive"
if [ "${NOPROMPT}" = "usb" ]
then
prompt=
fi
else
# ejecting is a very good idea here
MESSAGE="Please remove the disc, close the tray (if any)"
if [ -x /usr/bin/eject ]
then
eject -p -m /live/image >/dev/null 2>&1
fi
if [ "${NOPROMPT}" = "cd" ]
then
prompt=
fi
fi
[ "$prompt" ] || return 0
if [ -x /bin/plymouth ] && plymouth --ping
then
plymouth message --text="${MESSAGE} and press ENTER to continue:"
plymouth watch-keystroke > /dev/null
else
stty sane < /dev/console
printf "\n\n${MESSAGE} and press ENTER to continue:" > /dev/console
read x < /dev/console
fi
fi
|
