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#
# checkroot.sh  Check to root filesystem.
#
# Version:      @(#)checkroot.sh  2.84  25-Jan-2002  miquels@cistron.nl
#

ROOTDEV=/dev/mmcblk0p2
if [ ! -b $ROOTDEV ]; then
    echo "$ROOTDEV not found or not a device file"
    exit 0
fi
ROOTTYPE_AUTO=ext3


# Shortcut to do nothing (workaround for NOV-10897)
# (but only if the rootfs is already rw, as per kernel cmdline)
# (qemu still needs checkroot.sh to remount root as rw)
if grep -qs rw /proc/cmdline ; then
    # rootfs already rw as per kernel cmdline; skip checkroot
    exit 0
fi

# rw NOT detected in kernel cmdline
# Run checkroot to remount rootfs rw...

. /etc/default/rcS

#
# Read /etc/fstab.
#
exec 9>&0 </etc/fstab
rootmode=rw
rootopts=rw
# Set rootcheck without bothering with /etc/default/rcS
rootcheck="yes"
swap_on_md=no
devfs=
while read fs mnt type opts dump pass junk
do
        case "$fs" in
                ""|\#*)
                        continue;
                        ;;
                /dev/md*)
                        # Swap on md device.
                        test "$type" = swap && swap_on_md=yes
                        ;;
                /dev/*)
                        ;;
                *)
                        # Might be a swapfile.
                        test "$type" = swap && swap_on_md=yes
                        ;;
        esac

        test "$type" = devfs && devfs="$fs"

        # Currently we do not care about the other entries
        if test "$mnt" = "/"
        then
                #echo "[$fs] [$mnt] [$type] [$opts] [$dump] [$pass] [$junk]"

                rootopts="$opts"
                roottype="$type"

                #The "spinner" is broken on busybox sh
                TERM=dumb

                test "$pass" = 0 -o "$pass" = "" && rootcheck=no

                # Enable fsck for ext2 and ext3 rootfs, disable for everything else
        # Allow auto as well -- a hack
                case "$type" in
            auto)
                roottype=$ROOTTYPE_AUTO
                rootcheck=yes
                ;;
                    ext2|ext3)
                rootcheck=yes
                ;;
                    *)
                    rootcheck=no
                ;;
                esac

                if test "$rootcheck" = yes
                then
                        if ! test -x "/sbin/fsck.${roottype}"
                        then
                                echo -e "\n * * * WARNING: /sbin/fsck.${roottype} is missing! * * *\n"
                                rootcheck=no
                        fi
                fi

                case "$opts" in
                        ro|ro,*|*,ro|*,ro,*)
                                rootmode=ro
                                ;;
                esac
        fi
done
exec 0>&9 9>&-

#
# Check the root filesystem.
#
if test -f /fastboot || test $rootcheck = no
then
  test $rootcheck = yes && echo "Fast boot, no filesystem check"
else
  #
  # Ensure that root is quiescent and read-only before fsck'ing.
  #
  mount -n -o remount,ro /
  if test $? = 0
  then
    if test -f /forcefsck
    then
            force="-f"
    else
            force=""
    fi
    if test "$FSCKFIX" = yes
    then
            fix="-y"
    else
            fix="-a"                # mapped to -p for ext2
    fi
    spinner="-C"
    case "$TERM" in
        dumb|network|unknown|"") spinner="" ;;
    esac
    test `uname -m` = s390 && spinner="" # This should go away
    test "$VERBOSE" != no && echo "Checking root filesystem..."
    fsck $spinner $force $fix $ROOTDEV
    RTC=$?
    #
    # If there was a failure, drop into single-user mode.
    #
    # NOTE: "failure" is defined as exiting with a return code of
    # 2 or larger.  A return code of 1 indicates that filesystem
    # errors were corrected but that the boot may proceed.
    #

    echo "RETURNCODE: [$RTC]"

    if test "$RTC" -gt 3
    then

      # Since this script is run very early in the boot-process, it should be safe to assume that the
      # output is printed to VT1. However, some distributions use a bootsplash to hide the "ugly" boot
      # messages and having the bootsplash "hang" due to a waiting fsck prompt is less than ideal
      chvt 1

      # Surprise! Re-directing from a HERE document (as in
      # "cat << EOF") won't work, because the root is read-only.
      echo
      echo "fsck failed.  Please repair manually and reboot. "
      echo "Please note that the root filesystem is currently "
      echo "mounted read-only.  To remount it read-write:"
      echo
      echo "   # mount -n -o remount,rw /"
      echo
      echo "CONTROL-D will exit from this shell"
      echo "and REBOOT the system."
      echo
      # Start a single user shell on the console
      test -x /sbin/sulogin && /sbin/sulogin $CONSOLE
      reboot -f
    fi
  else
    echo "*** ERROR!  Cannot fsck root fs because it is not mounted read-only!"
    echo
  fi
fi

#
#       If the root filesystem was not marked as read-only in /etc/fstab,
#       remount the rootfs rw but do not try to change mtab because it
#       is on a ro fs until the remount succeeded. Then clean up old mtabs
#       and finally write the new mtab.
#       This part is only needed if the rootfs was mounted ro.
#
ROOTFSDEV="/dev/root"
if ! grep -q "^$ROOTFSDEV " /proc/mounts; then
  ROOTFSDEV="rootfs"
fi
if [ $(grep "^$ROOTFSDEV .*static" /proc/mounts | awk '{print $4}' | sed 's/,.*$//') = rw ]; then
        echo "Root filesystem already read-write, not remounting"
        exit 0
fi

echo "Remounting root file system..."
mount -n -o remount,$rootmode /
if test "$rootmode" = rw
then
        if test ! -L /etc/mtab
        then
                rm -f /etc/mtab~ /etc/nologin
                : > /etc/mtab
        fi
        mount -f -o remount /
        mount -f /proc
        test "$devfs" && grep -q '^devfs /dev' /proc/mounts && mount -f "$devfs"
fi

: exit 0