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#!/usr/bin/env bash
# Copyright (C) 2006 OpenWrt.org
[ $# == 5 ] || {
echo "SYNTAX: $0 <file> <kernel size> <kernel directory> <rootfs size> <rootfs image>"
exit 1
}
file="$1"
part1s="$2"
part1d="$3"
part2s="$4"
part2f="$5"
head=16
sect=63
cyl=$(( ($part1s + $part2s) * 1024 * 1024 / ($head * $sect * 512)))
dd if=/dev/zero of="$file" bs=1M count=$(($part1s + $part2s)) 2>/dev/null || exit
fdisk -u -C $cyl -H $head -S $sect "$file" > /dev/null 2>/dev/null <<EOF
n
p
1
+${part1s}M
n
p
2
+${part2s}M
w
q
EOF
block() {
echo -e 'p\nq' | fdisk -u -C $cyl -H $head -S $sect "$file" | awk -v file="$file$1" -v n="$(($2 + 2))" '
$1 == file {
print $n * 512
}'
}
start="$(block 1 0)"
end="$(block 1 1)"
blocks="$(( ($end - $start) / 1024 ))"
genext2fs -d "$part1d" -b "$blocks" "$file.kernel"
dd if="$file.kernel" of="$file" bs=512 seek="$(($start / 512))" conv=notrunc
rm -f "$file.kernel"
start="$(block 2 0)"
dd if="$part2f" of="$file" bs=512 seek="$(($start / 512))" conv=notrunc
which chpax >/dev/null && chpax -zp $(which grub)
grub --device-map=/dev/null <<EOF
device (hd0) $file
geometry (hd0) $cyl $head $sect
root (hd0,0)
setup (hd0)
EOF
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