Call in launchd plist to run at user login to automatically mount a disk. Example usage iTunes Library stored on NAS.

mount.sh

#!/usr/bin/env bash
# call with `mount.sh true` for debug messages

version="1.0"
dbg=false
home_vols=( "/Volumes/iTunes" "/Volumes/Drobo" )  # order is important
webdav_vols=( "/Volumes/user1" "/Volumes/user2" "/Volumes/user3" )
home_router_mac="mac-address-here"
# how to grab drobo_ip based upon drobo mac address using `netstat -rnf inet`
drobo_mac="mac-address-here"
drobo_ip=`netstat -rnf inet | grep $drobo_mac | awk {'print$1'}`
crashplan_server="mini-server"
media_server="mini-server"
mounts=( `mount | grep /Volumes | awk {'print$3'}` )
router_ip=`netstat -rnf inet | grep default | awk {'print$2'}`
router_mac=`netstat -rnf inet | grep -v link | grep -w ^$router_ip | awk {'print$2'}`

#test for any parameter, true if debugging
#test -n "$1" && dbg=$1 || dbg=false #;dbg=true
case "$1" in
  "" ) ;; #if no parameter then run script
  -v|--version ) echo $0" "v$version && exit 0 ;;
  -d|--debug ) dbg=true ;;
  *) echo -e "-v or --version for version number\n-d or --debug for debug info" ;;
esac
  
function debug {
  [ $dbg == true ] && echo $1 
}

function on_error {
  echo "errno $1"
  echo "rmdir $vol"
  rmdir $vol
  isMounted=false
}

function un_mount {
  for mount in ${mounts[@]}; do
    for vol in ${home_vols[@]}; do
      [ $mount == $vol ] && mount | grep afp | grep $mount | awk {'print$3'} | xargs -t umount -f
    done
    for vol in ${webdav_vols[@]}; do
      [ $mount == $vol ] && mount | grep http | grep $mount | awk {'print$3'} | xargs -t umount -f
    done
  done
  run_iTunes
  exit $?
}

function mount_disk {
  run_iTunes
  echo "trying to mount $vol as $1"
  mkdir $vol
  case "$1" in
    "afp_rw" ) mount_afp afp://$drobo_ip/Drobo/$2 $vol ;;
    "afp_ro" ) mount_afp -o rdonly afp://$drobo_ip/Drobo/$2 $vol ;;
    #"webdav" ) mount_webdav http://host.com/webdav/$2 $vol ;;
    *) echo "Usage: mount_disk [afp_rw|afp_ro|webdav] ['iTunes|webdav_disk']" ;;
  esac
  test $? != 0 && on_error $?
}

function run_iTunes {
  [[ `mount | grep /Volumes | awk {'print$3'} | grep -Ec "(/Volumes/DroboShare)"` -ge 0 ]] && isMounted=false
  [[ `mount | grep /Volumes | awk {'print$3'} | grep -Ec "(/Volumes/iTunes|/Volumes/Drobo$)"` -gt 0 ]] && isMounted=true
  # startup iTunes on media_server
  if ! $isMounted; then
    killall -c iTunes
  fi
  [[ (`scutil --get ComputerName` == $media_server) && $isMounted ]] && /usr/local/etc/load_myProcess.sh
}

# if nothing mounted need $vols not empty to try when at home
[ -z $mounts ] && mounts=( "zero_mounts" )

debug "Running $0"
debug "router: ${router_ip} -- ${router_mac} -- drobo ip: ${drobo_ip}"
debug "volumes: `ls /Volumes*`"
debug "mounted volumes: `echo ${mounts[@]}`"

if [ "$router_mac" == "" ]; then
  debug "not connected"
  un_mount
fi
if ! [ "$router_mac" == $home_router_mac ]; then 
  debug "not at home"
  un_mount
fi
if [ $router_mac == $home_router_mac ]; then
  debug "at home"
  run_iTunes
  for mount in ${mounts[@]}; do
    for vol in ${home_vols[@]}; do
      if [ ! $mount == $vol ] && [ ! -d $vol ]; then
        case $vol in
          "/Volumes/Drobo" ) [ `scutil --get ComputerName` == $crashplan_server ] && mount_disk afp_rw ;;          
          "/Volumes/iTunes" ) [ `scutil --get ComputerName` != $crashplan_server ] && mount_disk afp_rw "iTunes" ;;
        esac
      fi
    done
    for vol in ${webdav_vols[@]}; do
      if [ ! $mount == $vol ] && [ ! -d $vol ]; then
        webdav=`echo $vol | awk -F/ '{print$3}'`
        
        [ `scutil --get ComputerName` == $media_server ] && mount_disk webdav $webdav
        
        case $vol in
          "/Volumes/user1" ) [ $USER == "user1" ] && mount_disk webdav "user1" ;;
          "/Volumes/user2" ) [ $USER == "user2" ] && mount_disk webdav "user2" ;;
          "/Volumes/user3" ) [ $USER == "user3" ] && mount_disk webdav "user3" ;;
        esac
      fi
    done
  done
fi

run_iTunes

debug "isMounted: "$isMounted
debug "volumes: `ls /Volumes*`"
debug "mounted volumes: `mount | grep /Volumes | awk {'print$3'}`"