~ubuntu-installer/lupin/hardy

#! /bin/sh

# /etc/init.d/mounthost: Remount /host folder read write

#

# Written by Agostino Russo <agostino.russo@gmail.com> based on checkroot.sh

#

### BEGIN INIT INFO

# Provides:        mounthost

# Required-Start:    mountdevsubfs

# Required-Stop:

# Default-Start:    S

# Default-Stop:

# Short-Description:    Remount /host folder read write.

### END INIT INFO

PATH=/sbin:/bin

. /lib/init/vars.sh

. /lib/lsb/init-functions

do_start() {

    [ "$VERBOSE" = no ] || log_action_begin_msg "Mounting host filesystem read-write"

    hosttype=none

    hostopts=defaults

    hostmode=rw

    hostcheck=no

    host_mountpoint=

    host_device=

    loop_file=

    ES=$?

    #Find loopmounted root in fstab

    while read DEV MTPT FSTYPE OPTS DUMP PASS JUNK;do

        [ -z "${DEV%%#*}" ] || [ ! "$MTPT" = "/" ] && continue

        [ "${OPTS#*loop}" = "$OPTS" ] && continue

        case "$OPTS" in

            ro|ro,*|*,ro|*,ro,*) hostmode=ro;;

        esac

        host_mountpoint="$DEV"

        loop_file="$DEV"

        break

    done < /etc/fstab

    [ "$loop_file" ] || exit 0 

    #Find host device

	host_device=

	while [ -n "$host_mountpoint" ]; do

		while read DEV MTPT FSTYPE OPTS REST; do

			if [ "$MTPT" = "$host_mountpoint" ]; then

				host_device=$DEV

				break

			fi

		done < /proc/mounts

		host_mountpoint="${host_mountpoint%/*}"

		[ -z "$host_device" ] || break

    done

    #Remount hostdevice

    if [ -n "$host_device" ]; then

        if [ "$hostcheck" = yes ]; then

            if \

                ! mount    -n -o remount,ro              "$host_device" /host             \

                && ! mount -n -o remount,ro -t dummytype "$host_device" /host 2>/dev/null \

                && ! mount -n -o remount,ro            "$host_device"  /host 2>/dev/null

            then

                log_failure_msg "Cannot check host file system because it is not mounted read-only."

                rootcheck=no

            fi

            #TBD add fs checking

            #skipping since not supported by ntfs-3g

        fi

        mount -n -o remount,$hostopts,$hostmode "$host_device" /host

        ES=$?

        #make sure that the loopdevice is also set rw/ro

        if [ -f "$loop_file" ]; then

            loop_device=$(losetup -a | grep "($loop_file)")

            loop_device=${loop_device%%:*}

            if [ -b "$loop_device" ]; then

                blockdev --set$hostmode "$loop_device" || true

            fi

        fi

    fi

    [ "$VERBOSE" = no ] || log_action_end_msg "$ES"

}

case "$1" in

  start)

    do_start

    ;;

  restart|reload|force-reload)

    echo "Error: argument '$1' not supported" >&2

    exit 3

    ;;

  stop)

    # No-op

    ;;

  *)

    echo "Usage: $0 start|stop" >&2

    exit 3

    ;;

esac

exit 0