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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
}
# usage: pad from to blocks
# cat $from to $to and pad the output to $blocks * 512 bytes
pad() {
from="$1"
to="$2"
blocks="$3"
if [ ! -e "$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
tosize=$(stat -c "%s" "$to")
toblocks_before=$(( $tosize / 512 ))
dd if="$from" bs=512 count=$blocks conv=sync >> "$to" 2> /dev/null
tosize=$(stat -c "%s" "$to")
toblocks=$(( $tosize / 512 ))
blocksleft=$(( $blocks - $toblocks + $toblocks_before ))
if [ $blocksleft -gt 0 ]; then
dd if=/dev/zero bs=512 count=$blocksleft >> "$to" 2>/dev/null
fi
}
partcount=0
while getopts "hm:n:o:p:" OPT
do
case "$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
IMAGETMP1=$(mktemp -p ${PTXDIST_TEMPDIR})
IMAGETMP2=$(mktemp -p ${PTXDIST_TEMPDIR})
IMAGETMP3=$(mktemp -p ${PTXDIST_TEMPDIR})
IMAGETMP4=$(mktemp -p ${PTXDIST_TEMPDIR})
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 $(seq 4); do
pstart=$(( $(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
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 >> $IMAGEFILE
if [ -z "${pimage}" ]; then
pimage=/dev/zero
fi
echo " Initializing partition $i with '$(basename $pimage)'"
eval TMPFILE=\$IMAGETMP${i}
pad "$pimage" "${TMPFILE}" $psize
extraarg=""
done
# add offset to first partition
offset=$(( $(echo ${PART[1]} | awk -F: '{print $1}') - 1))
if [ ${offset} -gt 1 ]; then
echo
echo "-------------------------------------------"
echo "Creating hard disk's first partition offset"
echo "-------------------------------------------"
echo -n "padding ${offset} empty sectors..."
dd if=/dev/zero bs=512 count=$offset >> $IMAGEFILE 2>/dev/null
echo "done"
fi
echo
echo "----------------------------"
echo "Appending partitions content"
echo "----------------------------"
if [ -s ${IMAGETMP1} ]; then
echo -n "adding content for partition 1..."
cat ${IMAGETMP1} >> ${IMAGEFILE}
echo "done"
fi
# FIXME padding sectors?
if [ -s ${IMAGETMP2} ]; then
echo -n "adding content for partition 2..."
cat ${IMAGETMP2} >> ${IMAGEFILE}
echo "done"
fi
# FIXME padding sectors?
if [ -s ${IMAGETMP3} ]; then
echo -n "adding content for partition 3..."
cat ${IMAGETMP3} >> ${IMAGEFILE}
echo "done"
fi
# FIXME padding sectors?
if [ -s ${IMAGETMP4} ]; then
echo -n "adding content for partition 4..."
cat ${IMAGETMP4} >> ${IMAGEFILE}
echo "done"
fi
rm -f ${IMAGETMP1} ${IMAGETMP2} ${IMAGETMP3} ${IMAGETMP4}
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