Root/
Source at commit 85ea640 created 13 years 10 months ago. By Mirko Vogt, kernel image name changed since the profile is now part of the image name(s) | |
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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" |
35 |