USB-Festplatten automatisch schlafen legen/Spindown

#!/bin/bash
# Author: Mace Moneta
# Description: Spin down the drive when it goes idle


PARAM=$1
OPTION=${PARAM%%=*}
VALUE=${PARAM##*=}
LOCK_FILE="/dev/shm/idle-drive-${VALUE}.lock"
STATE_FILE="/dev/shm/idle-drive-${VALUE}.state"
DOWN_FILE="/dev/shm/idle-drive-${VALUE}.down"
FIX="/dev/shm/idle-drive.fixed"


idle_drive_log() {
   local PREFIX="idle-drive.info"
   local PREFIXLEN=${#PREFIX}
   local PREFIXLEN=$((10#$PREFIXLEN+2))
   local MSG=$1
   local MSGLEN=${#MSG}
   local MSGLEN=$((10#$MSGLEN+$PREFIXLEN))
   logger -s -t $PREFIX "$MSG"
}


idle_drive_cleanup() {
   rm -f $LOCK_FILE
   idle_drive_log "Exiting on interrupt."
   exit
}


trap idle_drive_cleanup INT
trap idle_drive_cleanup HUP
trap idle_drive_cleanup QUIT
trap idle_drive_cleanup USR1
trap idle_drive_cleanup TERM


DRIVE=`ls -l --full-time /dev/disk/by-label/ | grep "$VALUE" | awk '{print $11}' | sed s_\.\.\/\.\.\/__`
DRIVE=${DRIVE##*/}
DISK=${DRIVE:0:3}
DRIVE="/dev/${DISK:0:3}"
echo $DRIVE
echo $DISK


if [ "$DISK" == "" ]; then
   idle_drive_log 'Disk not found.'
   exit 1
fi


if [ -f $LOCK_FILE ]; then
   idle_drive_log "Already in progress for $DRIVE ($VALUE)."
   exit 1
fi


touch $LOCK_FILE


# Check I/O stats to see if the drive has been idle
STATE=`grep " $DISK " /proc/diskstats`
if [ -f $STATE_FILE ]; then
   STATE_PREVIOUS=`/bin/cat $STATE_FILE`
else
   idle_drive_log "Initializing state for $DRIVE ($VALUE)."
   echo "$STATE" > $STATE_FILE
   rm -f $LOCK_FILE
   exit 0
fi


# If the I/O stats haven't changed, the drive is idle
if [ "$STATE" == "$STATE_PREVIOUS" ] && [ ! -f $DOWN_FILE ]; then
   idle_drive_log "Disk state unchanged and disk spinning. Spin down drive $DRIVE ($VALUE)"
   sync
   sdparm --flexible --command=sync $DRIVE &>/dev/null
   sdparm --flexible --command=stop $DRIVE &>/dev/null
   [ ! -f $FIX ] && sleep 5 && touch $FIX && sdparm --flexible --command=stop $DRIVE &>/dev/null
   STATE=`grep " $DISK " /proc/diskstats`
   echo "$STATE" > $STATE_FILE
   touch $DOWN_FILE
else
   if [ "$STATE" != "$STATE_PREVIOUS" ]; then
      idle_drive_log "Disk state changed. Deleting $DOWN_FILE and refreshing state."
      rm -f $DOWN_FILE
      echo "$STATE" > $STATE_FILE
   fi
fi


# Done
rm -f $LOCK_FILE
exit 0