treewide: replace nbd@openwrt.org with nbd@nbd.name
[openwrt/openwrt.git] / scripts / combined-ext-image.sh
1 #!/bin/sh
2 #
3 # Copyright (C) 2011 OpenWrt.org
4 #
5 # This is free software, licensed under the GNU General Public License v2.
6 # See /LICENSE for more information.
7 #
8
9 # Write image header followed by all specified files
10 # The header is padded to 64k, format is:
11 # CE magic word ("Combined Extended Image") (2 bytes)
12 # <CE_VERSION> file format version field (2 bytes)
13 # <TYPE> short description of the target device (32 bytes)
14 # <NUM FILES> number of files following the header (2 byte)
15 # <file1_name> name of the first file (32 bytes)
16 # <file1_length> length of the first file encoded as zero padded 8 digit hex (8 bytes)
17 # <file1_md5> md5 checksum of the first file (32 bytes)
18 # <fileN_name> name of the Nth file (32 bytes)
19 # <fileN_length> length of the Nth file encoded as zero padded 8 digit hex (8 bytes)
20 # <fileN_md5> md5 checksum of the Nth file (32 bytes)
21
22 ## version history
23 # * version 1: initial file format with num files / name / length / md5 checksum
24
25 ME="${0##*/}"
26
27 usage() {
28 echo "Usage: $ME <type> <ext filename> <file1> <filename1> [<file2> <filename2> <fileN> <filenameN>]"
29 [ "$IMG_OUT" ] && rm -f "$IMG_OUT"
30 exit 1
31 }
32
33 [ "$#" -lt 4 ] && usage
34
35 CE_VERSION=1
36 IMG_TYPE=$1; shift
37 IMG_OUT=$1; shift
38 FILE_NUM=$(($# / 2))
39 FILES=""
40
41 printf "CE%02x%-32s%02x" $CE_VERSION "$IMG_TYPE" $FILE_NUM > $IMG_OUT
42
43 while [ "$#" -gt 1 ]
44 do
45 file=$1
46 filename=$2
47
48 [ ! -f "$file" ] && echo "$ME: Not a valid file: $file" && usage
49 FILES="$FILES $file"
50 md5=$(cat "$file" | md5sum -)
51 printf "%-32s%08x%32s" "$filename" $(stat -c "%s" "$file") "${md5%% *}" >> $IMG_OUT
52 shift 2
53 done
54
55 [ "$#" -eq 1 ] && echo "$ME: Filename not specified: $1" && usage
56
57 mv $IMG_OUT $IMG_OUT.tmp
58 dd if="$IMG_OUT.tmp" of="$IMG_OUT" bs=65536 conv=sync 2>/dev/null
59 rm $IMG_OUT.tmp
60
61 cat $FILES >> $IMG_OUT