package/openssl: refresh patches
[openwrt.git] / scripts / combined-image.sh
1 #!/bin/sh
2
3 BLKSZ=65536
4
5 [ -f "$1" -a -f "$2" ] || {
6 echo "Usage: $0 <kernel image> <rootfs image> [output file]"
7 exit 1
8 }
9
10 IMAGE=${3:-openwrt-combined.img}
11
12 # Make sure provided images are 64k aligned.
13 kern="${IMAGE}.kernel"
14 root="${IMAGE}.rootfs"
15 dd if="$1" of="$kern" bs=$BLKSZ conv=sync 2>/dev/null
16 dd if="$2" of="$root" bs=$BLKSZ conv=sync 2>/dev/null
17
18 # Calculate md5sum over combined kernel and rootfs image.
19 md5=$(cat "$kern" "$root" | md5sum -)
20
21 # Write image header followed by kernel and rootfs image.
22 # The header is padded to 64k, format is:
23 # CI magic word ("Combined Image")
24 # <kernel length> length of kernel encoded as zero padded 8 digit hex
25 # <rootfs length> length of rootfs encoded as zero padded 8 digit hex
26 # <md5sum> checksum of the combined kernel and rootfs image
27 ( printf "CI%08x%08x%32s" \
28 $(stat -c "%s" "$kern") $(stat -c "%s" "$root") "${md5%% *}" | \
29 dd bs=$BLKSZ conv=sync;
30 cat "$kern" "$root"
31 ) > ${IMAGE} 2>/dev/null
32
33 # Clean up.
34 rm -f "$kern" "$root"
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