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1 #!/bin/bash | |
2 | |
3 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved. | |
4 # Use of this source code is governed by a BSD-style license that can be | |
5 # found in the LICENSE file. | |
6 | |
7 # This script takes a path to a rootfs.ext2 which was generated by | |
8 # build_image.sh and generates an image that can be used for auto | |
9 # update. | |
10 | |
11 set -e | |
12 | |
13 if [ -z "$2" -o -z "$1" ]; then | |
14 echo "usage: $0 path/to/kernel_partition_img path/to/rootfs_partition_img" | |
15 exit 1 | |
16 fi | |
17 | |
18 if [ "$CROS_GENERATE_UPDATE_PAYLOAD_CALLED" != "1" ]; then | |
19 echo "WARNING:" | |
20 echo "This script should only be called from cros_generate_update_payload" | |
21 echo "Please run that script with --help to see how to use it." | |
22 fi | |
23 | |
24 if [ $(whoami) = "root" ]; then | |
25 echo "running $0 as root which is unneccessary" | |
26 fi | |
27 | |
28 KPART="$1" | |
29 ROOT_PART="$2" | |
30 | |
31 KPART_SIZE=$(stat -c%s "$KPART") | |
32 | |
33 # Sanity check size. | |
34 if [ "$KPART_SIZE" -gt $((16 * 1024 * 1024)) ]; then | |
35 echo "Kernel partition size ($KPART_SIZE bytes) greater than 16 MiB." | |
36 echo "That's too big." | |
37 exit 1 | |
38 fi | |
39 | |
40 FINAL_OUT_FILE=$(dirname "$1")/update.gz | |
41 UNCOMPRESSED_OUT_FILE="$FINAL_OUT_FILE.uncompressed" | |
42 | |
43 # First, write size of kernel partition in big endian as uint64 to out file | |
44 # printf converts it to a number like 00000000003d0900. sed converts it to: | |
45 # \\x00\\x00\\x00\\x00\\x00\\x3d\\x09\\x00, then xargs converts it to binary | |
46 # with echo. | |
47 printf %016x "$KPART_SIZE" | \ | |
48 sed 's/\([0-9a-f][0-9a-f]\)/\\\\x\1/g' | \ | |
49 xargs echo -ne > "$UNCOMPRESSED_OUT_FILE" | |
50 | |
51 # Next, write kernel partition to the out file | |
52 cat "$KPART" >> "$UNCOMPRESSED_OUT_FILE" | |
53 | |
54 # Sanity check size of output file now | |
55 if [ $(stat -c%s "$UNCOMPRESSED_OUT_FILE") -ne $((8 + $KPART_SIZE)) ]; then | |
56 echo "Kernel partition changed size during image generation. Aborting." | |
57 exit 1 | |
58 fi | |
59 | |
60 # Put rootfs into the out file | |
61 cat "$ROOT_PART" >> "$UNCOMPRESSED_OUT_FILE" | |
62 | |
63 # compress and hash | |
64 CS_AND_RET_CODES=$(gzip -c "$UNCOMPRESSED_OUT_FILE" | \ | |
65 tee "$FINAL_OUT_FILE" | openssl sha1 -binary | \ | |
66 openssl base64 | tr '\n' ' '; \ | |
67 echo ${PIPESTATUS[*]}) | |
68 EXPECTED_RET_CODES="0 0 0 0 0" | |
69 set -- $CS_AND_RET_CODES | |
70 CALC_CS="$1" | |
71 shift | |
72 RET_CODES="$@" | |
73 if [ "$RET_CODES" != "$EXPECTED_RET_CODES" ]; then | |
74 echo compression/hash failed. $RET_CODES | |
75 exit 1 | |
76 fi | |
77 | |
78 rm "$UNCOMPRESSED_OUT_FILE" | |
79 | |
80 echo Success. hash is "$CALC_CS" | |
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