initdisk.sh

#!/bin/bash

# by atalntis@wisetodd.com

# Description :
# 1. sd로 시작되는 disk 정보에 대해서만 dd를 한다. 
# 2. 만일 sda1, sda2식으로 이루어진 subpartition은 skip한다. 
# 3. 아래의 disk 초기화는 sda ~ sdz까지로 제한한다. 

#INPUTFILE=/proc/diskstats
INPUTFILE=/proc/partitions
TMPFILE=/tmp/diskinfo.tmp
BSSIZE=1M
COUNT=256



#:docstring strcmp:
# Usage: strcmp $s1 $s2
#
# Strcmp compares its arguments and returns an integer less than, equal to,
# or greater than zero, depending on whether string s1 is lexicographically
# less than, equal to, or greater than string s2.
#:end docstring:

###;;;autoload
function strcmp ()
{
    [ "$1" = "$2" ] && return 0

    [ "${1}" '<' "${2}" ] > /dev/null && return 2

    return 1
}


#:docstring strncmp:
# Usage: strncmp $s1 $s2 $n
# 
# Like strcmp, but makes the comparison by examining a maximum of n
# characters (n less than or equal to zero yields equality).
#:end docstring:
function strncmp ()
{
    if [ -z "${3}" ] || [ "${3}" -le "0" ] 
	then
       return 0
    fi
   
    if [ ${3} -ge ${#1} ] && [ ${3} -ge ${#2} ] 
	then
       strcmp "$1" "$2"
       return $?
    else
       s1=${1:0:$3}
       s2=${2:0:$3}
       strcmp $s1 $s2
       return $?
    fi
}

lownumber=048
highnumber=057

function isnumber()
{
    result=$(printf "%03d\n" \'${1})
    if [ "${result}" -le "$lownumber" ] ; then
        return 1
    fi
    if [ "${result}" -ge "$highnumber" ] ; then
        return 1
    fi
    return 0
}

function isexistnumber()
{
    strextra=${1}

    while [ ${strextra} ]
    do
        strextra_tmp=${strextra:1}
        strextra=$strextra_tmp
        isnumber $strextra_tmp
        if [ $? -eq 0 ] ; then
            return 0
        fi
    done

    return 1
}


cat $INPUTFILE > $TMPFILE

while read -r f1 f2 f3 f4
do

	#
	# Skip main block-device for test
	#
	strncmp $f4 "sda" 3
	if [ $? -eq 0 ] ; then
		continue
	fi

	strncmp $f4 "sd" 2
	if [ $? -eq 0 ] ; then
		isexistnumber $f4
		if [ $? -eq 0 ] ; then
			continue;
		fi
		COUNT=$f3
		dd if=/dev/zero of=/dev/$f4 bs=$BSSIZE count=$COUNT
		echo "w" | fdisk /dev/$f4 
		echo "dd if=/dev/zero of=/dev/$f4 bs=$BSSIZE count=$COUNT"
	fi
done < $TMPFILE