#!/bin/sh

# Crude method of read-testing a hard drive
# with percentage-based progress reporting.

VER="0.1"

DEV="$1"
if [[ ! -e "/sys/block/$DEV" || "$DEV" = "" ]]
	then echo "Specify device..." ; exit 1
fi

SZ=$(cat /sys/block/$DEV/size)
PCNT=$(expr $SZ / 100)
# Figure out if there will be a lone final block or not
PCNT2=$(expr $PCNT \* 100)
LB=0
# Lone blocks after 100 percent?
if [ "$SZ" -gt "$PCNT2" ]; then LB=1 ; fi
# Percentage coutner
CNT=0
CTIME=$(date +%s)

while [ $CNT -lt 101 ]
	do echo -en "\rTesting $DEV: ${CNT}%"
	SKIP=$(expr $PCNT \* $CNT)
	if ! dd if=/dev/$DEV of=/dev/null bs=512 skip=$SKIP count=$PCNT 2>/dev/null
		then echo -e "\rTesting $DEV: FAILED!"
		exit 2
	fi
	CNT=$((CNT + 1))
done

T=$(date +%s)
T2=$(expr $T - $CTIME)
MINS=$(expr $T2 / 60)
SECS=$(expr $MINS \* 60)
SECS=$(expr $T2 - $SECS)
MB=$(expr $SZ / 2048)
RATE=$(expr $MB / $T2)
echo -e "\rTesting $DEV: PASSED. Took ${MINS}m${SECS}s at ${RATE} MB/sec."