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#! /bin/sh
### BEGIN INIT INFO
# Provides:          mtab
# Required-Start:    checkroot
# Required-Stop:
# Default-Start:     S
# Default-Stop:
# Short-Description: Update mtab file.
# Description:       Update the mount program's mtab file after
#                    all local filesystems have been mounted.
### END INIT INFO

#
# The main purpose of this script is to update the mtab file to reflect
# the fact that virtual filesystems were mounted early on, before mtab
# was writable.
#

PATH=/lib/init:/sbin:/bin
. /lib/init/vars.sh

TTYGRP=5
TTYMODE=620
[ -f /etc/default/devpts ] && . /etc/default/devpts

TMPFS_SIZE=
[ -f /etc/default/tmpfs ] && . /etc/default/tmpfs

KERNEL="$(uname -s)"

. /lib/lsb/init-functions
. /lib/init/mount-functions.sh

# $1 - fstype
# $2 - mount point
# $3 - mount name/device
# $4 - mount options
domtab ()
{
        # Directory present?
        if [ ! -d $2 ]
        then
                return
        fi

        # Not mounted?
        if ! mountpoint -q $2 < /dev/null
        then
                return
        fi

        if [ -n "$3" ]
        then
                NAME="$3"
        else
                NAME="$1"
        fi

        # Already recorded?
        if ! grep -E -sq "^([^ ]+) +$2 +" /etc/mtab < /dev/null
        then
                mount -f -t $1 $OPTS $4 $NAME $2 < /dev/null
        fi
}

do_start () {
        DO_MTAB=""
        MTAB_PATH="$(readlink -f /etc/mtab || :)"
        case "$MTAB_PATH" in
          /proc/*)
                # Assume that /proc/ is not writable
                ;;
          /*)
                # Only update mtab if it is known to be writable
                # Note that the touch program is in /usr/bin
                #if ! touch "$MTAB_PATH" >/dev/null 2>&1
                #then
                #       return
                #fi
                ;;
          "")
                [ -L /etc/mtab ] && MTAB_PATH="$(readlink /etc/mtab)"
                if [ "$MTAB_PATH" ]
                then
                        log_failure_msg "Cannot initialize ${MTAB_PATH}."
                else
                        log_failure_msg "Cannot initialize /etc/mtab."
                fi
                ;;
          *)
                log_failure_msg "Illegal mtab location '${MTAB_PATH}'."
                ;;
        esac

        #
        # Initialize mtab file if necessary
        #
        if [ ! -f /etc/mtab ]
        then
                :> /etc/mtab
                chmod 644 /etc/mtab
        fi
        if selinux_enabled && which restorecon >/dev/null 2>&1 && [ -r /etc/mtab ]
        then
                restorecon /etc/mtab
        fi

        # S02mountkernfs.sh
        RW_OPT=
        [ "${RW_SIZE:=$TMPFS_SIZE}" ] && RW_OPT=",size=$RW_SIZE"
        domtab tmpfs /lib/init/rw tmpfs -omode=0755,nosuid$RW_OPT

        domtab proc /proc "proc" -onodev,noexec,nosuid
        if grep -E -qs "sysfs\$" /proc/filesystems
        then
                domtab sysfs /sys sysfs -onodev,noexec,nosuid
        fi
        if [ yes = "$RAMRUN" ] ; then
                RUN_OPT=
                [ "${RUN_SIZE:=$TMPFS_SIZE}" ] && RUN_OPT=",size=$RUN_SIZE"
                domtab tmpfs /var/run "varrun" -omode=0755,nosuid$RUN_OPT
        fi
        if [ yes = "$RAMLOCK" ] ; then
                LOCK_OPT=
                [ "${LOCK_SIZE:=$TMPFS_SIZE}" ] && LOCK_OPT=",size=$LOCK_SIZE"
                domtab tmpfs /var/lock "varlock" -omode=1777,nodev,noexec,nosuid$LOCK_OPT
        fi
        if [ -d /proc/bus/usb ]
        then
                domtab usbfs /proc/bus/usb "procbususb"
        fi

        # S03udev
        domtab tmpfs /dev "udev" -omode=0755

        # S04mountdevsubfs
        SHM_OPT=
        [ "${SHM_SIZE:=$TMPFS_SIZE}" ] && SHM_OPT=",size=$SHM_SIZE"
        domtab tmpfs /dev/shm tmpfs -onosuid,nodev$SHM_OPT
        domtab devpts /dev/pts "devpts" -onoexec,nosuid,gid=$TTYGRP,mode=$TTYMODE

        # Add everything else in /proc/mounts into /etc/mtab, with
        # special exceptions.
        exec 9<&0 0</proc/mounts
        while read FDEV FDIR FTYPE FOPTS REST
        do
                case "$FDIR" in
                        /lib/modules/*/volatile)
                                FDEV="lrm"
                                ;;
                        /dev/.static/dev)
                                # Not really useful to show in 'df',
                                # and it isn't accessible for non-root
                                # users.
                                continue
                                ;;
                esac
                domtab "$FTYPE" "$FDIR" "$FDEV" "-o$FOPTS"
        done
        exec 0<&9 9<&-
}

case "$1" in
  start|"")
        do_start
        ;;
  restart|reload|force-reload)
        echo "Error: argument '$1' not supported" >&2
        exit 3
        ;;
  stop)
        # No-op
        ;;
  *)
        echo "Usage: mountall-mtab.sh [start|stop]" >&2
        exit 3
        ;;
esac

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