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#!/bin/bash
# Create a bootable harddisk (or compact flash) image from
# a partition definition given from command line
#
# (C) 2006, 2011 Pengutronix
#
Usage() {
cat <<-EOF
Usage: `basename "$0"` OPTIONS <svn rep>
-h this help
-o <hdimg file> resulting hd image
-i <img file> filesystem image
-p <def> partition definition (can be given multiple times)
A partition definition has the form
start_sector:end_sector:partition_type:[imagefile]
EOF
}
part_opts() {
pstart=$(( $(echo ${PART[$1]} | awk -F: '{print $1}') ))
pend=$(( $(echo ${PART[$1]} | awk -F: '{print $2}') ))
ptype=$(( $(echo ${PART[$1]} | awk -F: '{print $3}') ))
pimage=$(echo ${PART[$1]} | awk -F: '{print $4}')
psize=$(($pend - $pstart + 1))
}
partcount=0
while getopts "hm:n:o:p:" OPT
do
case "$OPT" in
h) Usage
exit 1
;;
o) IMAGEFILE="$OPTARG"
;;
p) partcount=$(($partcount + 1))
PART[$partcount]="$OPTARG"
;;
esac
done
if [ "$partcount" == 0 ]; then
echo "need at least one partition definition"
exit 1
fi
if [ "$partcount" -gt 4 ]; then
echo "a maximum of four partitions is allowed"
exit 1
fi
if [ -z "$IMAGEFILE" ]; then
echo "no output image file given"
exit 1
fi
echo "------------------------"
echo "Creating hard disk's MBR"
echo "------------------------"
# create the first 512 byte sector (MBR)
# fill it up to offset 446
dd if=/dev/zero bs=446 count=1 > $IMAGEFILE 2>/dev/null
# append the partitions
# mark the first partition bootable
extraarg="-c"
echo "------------------------------------"
echo "Creating hard disk's partition table"
echo "------------------------------------"
for i in 1 2 3 4; do
part_opts "$i"
if [ $i -gt $partcount ]; then
psize=0
fi
if [ ${psize} -ne 0 ]; then
echo "Partition $i (start=$pstart, size=$psize type=$ptype)"
fi
# add 0x55aa magic to last partition in table
if [ $i == 4 ]; then
extraarg="-m"
fi
genpart $extraarg -b $pstart -s $psize -t $ptype >> $IMAGEFILE
extraarg=""
done
for i in 1 2 3 4; do
part_opts "$i"
if [ -z "${pimage}" ]; then
continue
fi
echo " Initializing partition $i with '$(basename $pimage)'"
dd if="$pimage" of="$IMAGEFILE" bs=512 count="$psize" seek="$pstart" conv=notrunc 2>/dev/null
done
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