debian/src/initscripts/etc/init.d/mtab.sh

   1 #! /bin/sh
   2 ### BEGIN INIT INFO
   3 # Provides:          mtab
   4 # Required-Start:    checkroot
   5 # Required-Stop:
   6 # Default-Start:     S
   7 # Default-Stop:
   8 # Short-Description: Update mtab file.
   9 # Description:       Update the mount program's mtab file after
  10 #                    all local filesystems have been mounted.
  11 ### END INIT INFO
  12
  13 #
  14 # The main purpose of this script is to update the mtab file to reflect
  15 # the fact that virtual filesystems were mounted early on, before mtab
  16 # was writable.
  17 #
  18
  19 ## We don't need this on SLP platform
  20 [ -e /etc/init.d/.slp ] && exit 0
  21
  22 PATH=/sbin:/bin
  23 . /lib/init/vars.sh
  24
  25 TTYGRP=5
  26 TTYMODE=620
  27 [ -f /etc/default/devpts ] && . /etc/default/devpts
  28
  29 TMPFS_SIZE=
  30 [ -f /etc/default/tmpfs ] && . /etc/default/tmpfs
  31
  32 KERNEL="$(uname -s)"
  33
  34 . /lib/lsb/init-functions
  35 . /lib/init/mount-functions.sh
  36
  37 # $1 - fstype
  38 # $2 - mount point
  39 # $3 - mount name/device
  40 # $4 - mount options
  41 domtab ()
  42 {
  43         # Directory present?
  44         if [ ! -d $2 ]
  45         then
  46                 return
  47         fi
  48
  49         # Not mounted?
  50         if ! mountpoint -q $2 < /dev/null
  51         then
  52                 return
  53         fi
  54
  55         if [ -n "$3" ]
  56         then
  57                 NAME="$3"
  58         else
  59                 NAME="$1"
  60         fi
  61
  62         # Already recorded?
  63         if ! grep -E -sq "^([^ ]+) +$2 +" /etc/mtab < /dev/null
  64         then
  65                 mount -f -t $1 $OPTS $4 $NAME $2 < /dev/null
  66         fi
  67 }
  68
  69 do_start () {
  70         DO_MTAB=""
  71         MTAB_PATH="$(readlink -f /etc/mtab || :)"
  72         case "$MTAB_PATH" in
  73           /proc/*)
  74                 # Assume that /proc/ is not writable
  75                 ;;
  76           /*)
  77                 # Only update mtab if it is known to be writable
  78                 # Note that the touch program is in /usr/bin
  79                 #if ! touch "$MTAB_PATH" >/dev/null 2>&1
  80                 #then
  81                 #       return
  82                 #fi
  83                 ;;
  84           "")
  85                 [ -L /etc/mtab ] && MTAB_PATH="$(readlink /etc/mtab)"
  86                 if [ "$MTAB_PATH" ]
  87                 then
  88                         log_failure_msg "Cannot initialize ${MTAB_PATH}."
  89                 else
  90                         log_failure_msg "Cannot initialize /etc/mtab."
  91                 fi
  92                 ;;
  93           *)
  94                 log_failure_msg "Illegal mtab location '${MTAB_PATH}'."
  95                 ;;
  96         esac
  97
  98         #
  99         # Initialize mtab file if necessary
 100         #
 101         if [ ! -f /etc/mtab ]
 102         then
 103                 :> /etc/mtab
 104                 chmod 644 /etc/mtab
 105         fi
 106         if selinux_enabled && [ -x /sbin/restorecon ] && [ -r /etc/mtab ]
 107         then
 108                 restorecon /etc/mtab
 109         fi
 110
 111         # S02mountkernfs.sh
 112         RW_OPT=
 113         [ "${RW_SIZE:=$TMPFS_SIZE}" ] && RW_OPT=",size=$RW_SIZE"
 114         domtab tmpfs /lib/init/rw tmpfs -omode=0755,nosuid$RW_OPT
 115
 116         domtab proc /proc "proc" -onodev,noexec,nosuid
 117         if grep -E -qs "sysfs\$" /proc/filesystems
 118         then
 119                 domtab sysfs /sys sysfs -onodev,noexec,nosuid
 120         fi
 121         if [ yes = "$RAMRUN" ] ; then
 122                 RUN_OPT=
 123                 [ "${RUN_SIZE:=$TMPFS_SIZE}" ] && RUN_OPT=",size=$RUN_SIZE"
 124                 domtab tmpfs /var/run "varrun" -omode=0755,nosuid$RUN_OPT
 125         fi
 126         if [ yes = "$RAMLOCK" ] ; then
 127                 LOCK_OPT=
 128                 [ "${LOCK_SIZE:=$TMPFS_SIZE}" ] && LOCK_OPT=",size=$LOCK_SIZE"
 129                 domtab tmpfs /var/lock "varlock" -omode=1777,nodev,noexec,nosuid$LOCK_OPT
 130         fi
 131         if [ -d /proc/bus/usb ]
 132         then
 133                 domtab usbfs /proc/bus/usb "procbususb"
 134         fi
 135
 136         # S03udev
 137         domtab tmpfs /dev "udev" -omode=0755
 138
 139         # S04mountdevsubfs
 140         SHM_OPT=
 141         [ "${SHM_SIZE:=$TMPFS_SIZE}" ] && SHM_OPT=",size=$SHM_SIZE"
 142         domtab tmpfs /dev/shm tmpfs -onosuid,nodev$SHM_OPT
 143         domtab devpts /dev/pts "devpts" -onoexec,nosuid,gid=$TTYGRP,mode=$TTYMODE
 144
 145         # Add everything else in /proc/mounts into /etc/mtab, with
 146         # special exceptions.
 147         exec 9<&0 0</proc/mounts
 148         while read FDEV FDIR FTYPE FOPTS REST
 149         do
 150                 case "$FDIR" in
 151                         /lib/modules/*/volatile)
 152                                 FDEV="lrm"
 153                                 ;;
 154                         /dev/.static/dev)
 155                                 # Not really useful to show in 'df',
 156                                 # and it isn't accessible for non-root
 157                                 # users.
 158                                 continue
 159                                 ;;
 160                 esac
 161                 domtab "$FTYPE" "$FDIR" "$FDEV" "-o$FOPTS"
 162         done
 163         exec 0<&9 9<&-
 164 }
 165
 166 case "$1" in
 167   start|"")
 168         do_start
 169         ;;
 170   restart|reload|force-reload)
 171         echo "Error: argument '$1' not supported" >&2
 172         exit 3
 173         ;;
 174   stop)
 175         # No-op
 176         ;;
 177   *)
 178         echo "Usage: mountall-mtab.sh [start|stop]" >&2
 179         exit 3
 180         ;;
 181 esac
 182
 183 :