#!/bin/sh

disk_label=$1
file_system=$2
mount_point=$3
interval=$4

disk_exist=0
up=0

while [ true ]; do
    # １０秒毎にディスク有無のチェック
   if [ -e "/dev/disk/by-label/$disk_label" ]; then
      if [ $disk_exist = 0 ]; then
         disk=`findfs LABEL=$disk_label | sed -e "s@/dev/@@"`
         state=`grep " $disk " /proc/diskstats`

         disk_exist=1
         up=1
         count=$interval

         mount -t $file_system -o defaults,noatime /dev/$disk $mount_point
         echo "$disk_label ($disk) detected and mounted ($mount_point) " `date`
      fi
   else
      if [ $disk_exist = 1 ]; then
         disk_exist=0
         up=0
         echo "$disk_label ($disk) removed  " `date`
      fi
   fi

   sleep 10

   # ディスクがある場合のみ
   if [ $disk_exist = 1 ]; then
      count=$(($count-10))
      newstate=`grep " $disk " /proc/diskstats`
      if [ "$state" = "$newstate" ]; then
         if [ $count -lt 0 ]; then
            count=$interval
            if [ $up = 1 ]; then
               echo "$disk is spin-down  " `date`
               sync
               state=`grep " $disk " /proc/diskstats`
               sdparm --command=stop -r /dev/$disk 2>&1
               up=0
            fi
         fi
      else
         if [ $up = 0 ]; then
           echo "$disk is up  " `date`
         fi
         count=$interval
         state="$newstate"
         up=1
      fi
   fi
done