#!/bin/sh
#mount or umount filesystems of the specified type
#and start logging to a file via nfs if /var/log is mounted
#default is to mount all nfs entries
#this can be overridden.  For example:
##  fstype=vfat service nfsmount start
#one can also select mounts of the specified type:
##  mount="#mbari" service nfsmount start
#mounts all (nfs) entries containing the string #mbari


[ -s /etc/resolv.conf ] || {
  echo "Missing Network -- skipping NFS mounts"
  exit 1
}

op=$1;shift
: ${fstype:=nfs}
: ${mount:="$@"}
mntpts=`grep "$mount" /etc/fstab | 
    while read device mntpt fs rest; do
      [ "$device" = "#END" ] && break
      [ "$fs" = "$fstype" ] && echo $mntpt
    done`
    
[ -z "$mntpts" ] && {
  echo "/etc/fstab contains no $fstype entries marked \"$mount\"!"
  exit 1
}

mounted() {
#returns true if $1 is mounted, false if not, 2 if it does not exist
  realmnt=`realpath $1` || return 2
  cat /proc/mounts | 
    while read device mntpt rest; do
      [ "$realmnt" = "$mntpt" ] && return
    done
}

chklog() {
#stop logging monentarily of mntpt is /var or /var/log
  act=$1
  mntpt=$2
  echo "  ${act}ing $mntpt " 
    case $mntpt in
      /var|/var/log)
        pidof syslogd >/dev/null && /etc/init.d/syslog stop >/dev/null
          $act $mntpt
        /etc/init.d/syslog start >/dev/null
      ;;
      *)  
        $act $mntpt
    esac
}

mnt() {
  echo "Mounting network filesystems ..."
  set $mntpts
  for mntpt; do
    mounted $mntpt
    [ $? = 1 ] && chklog mount $mntpt
  done
}

umnt() {
  echo "Unmounting network filesystems ..."
  set $mntpts
  for mntpt; do
    mounted $mntpt && chklog umount $mntpt
  done
}

case "$op" in
    start)
       mnt
       ;;
                         
    restart)
       umnt
       mnt
       ;;
       
    stop)
       umnt
       ;;
       
    *)
       echo "usage: start|restart|stop"
       ;;
esac