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#!/bin/bash
# Create a bootable harddisk (or compact flash) image from
# a partition definition given from command line
#
# (C) 2006 Pengutronix
#
Usage() {
cat <<-EOF
Usage: `basename "$0"` OPTIONS <svn rep>
-h this help
-m <stage1> path to grub stage1
-n <stafe2> path to grub stage2
-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
}
# usage: pad from to blocks
# cat $from to $to and pad the output to $blocks * 512 bytes
pad() {
from="$1"
to="$2"
blocks="$3"
if [ ! -f "$from" ]; then
echo "$from does not exist"
exit 1
fi
fromsize=$(stat -c "%s" "$from")
if [ $(($fromsize)) -gt $(($blocks * 512)) ]; then
echo "warning: $from truncated. Need $fromsize bytes, but have only $(($blocks * 512))!"
fi
cat $from /dev/zero | dd bs=512 count=$(($blocks)) >> "$to" 2>/dev/null
}
partcount=0
while getopts "hm:n:o:p:" OPT
do
case "$OPT" in
h) Usage
exit 1
;;
m) STAGE1="$OPTARG"
;;
n) STAGE2="$OPTARG"
;;
o) IMAGEFILE="$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 "$IMAGEFILE" ]; then
echo "no output image file given"
exit 1
fi
IMAGETMP=$(mktemp)
# get the first 446 bytes of grub stage1 or from /dev/zero
if [ -n "$STAGE1" ]; then
echo "using stage1 file $STAGE1"
if [ ! -r "$STAGE1" ]; then
echo "cannot open stage1 file $STAGE1"
exit 1
fi
dd if="$STAGE1" bs=446 count=1 > $IMAGEFILE 2>/dev/null
else
dd if=/dev/zero bs=446 count=1 > $IMAGEFILE 2>/dev/null
fi
# add offset to first partition and fill it with grub stage2 if given
offset=$(( $(echo ${PART[1]} | awk -F: '{print $1}') - 1))
if [ -n "$STAGE2" ]; then
echo "using stage2 file $STAGE2"
if [ ! -r "$STAGE2" ]; then
echo "cannot open stage2 file $STAGE2"
exit 1
fi
pad "$STAGE2" "$IMAGETMP" $(($offset))
else
cat /dev/zero | dd bs=512 count=$offset > "$IMAGETMP" 2>/dev/null
fi
# append the partitions
# mark the first partition bootable
extraarg="-c"
for i in $(seq 4); do
pstart=$(( $(echo ${PART[$i]} | awk -F: '{print $1}') ))
pend=$(( $(echo ${PART[$i]} | awk -F: '{print $2}') ))
ptype=$(( $(echo ${PART[$i]} | awk -F: '{print $3}') ))
pimage=$(echo ${PART[$i]} | awk -F: '{print $4}')
psize=$(($pend - $pstart + 1))
if [ $i -gt $partcount ]; then
psize=0
fi
echo "Generating partition $i (start=$pstart, size=$psize type=$ptype)"
# add 0x55aa magic to last partition in table
if [ $i == 4 ]; then
extraarg="-m"
fi
genpart $extraarg -b $pstart -s $psize -t $ptype >> $IMAGEFILE
if [ -n "$pimage" ]; then
echo "Initializing partition $i with $pimage"
pad "$pimage" "$IMAGETMP" $(($psize))
fi
extraarg=""
done
cat $IMAGETMP >> $IMAGEFILE
rm -f $IMAGETMP
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