blob: 5799b39edac9afe35b65ee038a0e4ca6b55b799f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
#!/bin/bash
#
# lsinitcpio - dump the contents of an initramfs image
#
shopt -s extglob
die() {
local mesg=$1; shift
printf "error: $mesg\n" "$@"
exit 1
}
usage() {
cat<<USAGE
lsinitramfs %VERSION%
usage: ${0##*/} [options] <initramfs>
Options:
-a analyze contents
-h display this help
-v more verbose output
-x extract image to disk
USAGE
exit 1
}
in_array() {
local item needle=$1; shift
for item; do
[[ "$item" == $needle ]] && return 0 # Found
done
return 1 # Not Found
}
decomp() {
${compress:-cat} ${compress:+-cd} "$@"
}
declare verbose=
declare list='--list'
while getopts ':ahvx' flag; do
case $flag in
a) analyze=1 ;;
h) usage ;;
v) verbose='--verbose' ;;
x) unset list ;;
\?) die "invalid option -- '$OPTARG'" ;;
esac
done
shift $(( OPTIND - 1 ))
declare image=$1
[[ $image ]] || usage
[[ -f $image ]] || die "$image: No such file"
# read compression type
case "$(file -b "$image")" in
data|LZMA*) compress=lzma ;;
gzip*) compress=gzip ;;
bzip2*) compress=bzip2 ;;
lzop*) compress=lzop ;;
XZ*) compress=xz ;;
esac
if (( analyze )); then
declare -a binaries explicitmod modules foundhooks hooks
declare kernver ratio
# calculate compression ratio
if [[ $compress ]]; then
TIMEFORMAT=%R decomptime=$({ time decomp "$image" >/dev/null; } 2>&1 )
ratio=.$(( $(stat -c %s "$image") * 1000 /
$(decomp "$image" | bsdtar xOf - | wc -c) % 1000 ))
fi
# read contents of image
while read -r line; do
if [[ $line = *.ko?(.gz) ]]; then # module
if [[ -z $kernver ]]; then
[[ $line =~ /lib/modules/([^/]+)/ ]] && kernver=${BASH_REMATCH[1]}
fi
line=${line##*/}
modules+=("${line%.ko?(.gz)}")
continue
elif [[ $line = ./hooks/* ]]; then
foundhooks+=("${line##*/}")
elif [[ $line = *@(/bin/|/sbin/)* ]]; then
binaries+=("${line#.}")
fi
done < <(decomp "$image" | bsdtar tf -)
# source and read config
. <(decomp "$image" | bsdtar xOf - config)
explicitmod=($MODULES)
for hook in $HOOKS; do
in_array "$hook" "${foundhooks[@]}" && hooks+=("$hook")
done
# print results
printf '==> Image: %s\n' "$(readlink -e "$image")"
printf '==> Kernel: %s\n' "${kernver:-unknown}"
if [[ $compress ]]; then
printf '==> Compressed with: %s\n' "$compress"
printf ' -> Compression ratio: %s\n' "$ratio"
printf ' -> Estimated decompression time: %ss\n' "$decomptime"
fi
printf '\n'
if (( ${#modules[*]} )); then
printf '==> Included modules:\n'
for mod in "${modules[@]}"; do
printf ' %s' "$mod"
in_array "${mod//_/-}" "${explicitmod[@]//_/-}" && printf ' [explicit]'
printf '\n'
done | sort | column -c$(tput cols)
printf '\n'
fi
printf '==> Included binaries:\n'
printf ' %s\n' "${binaries[@]}"
printf '\n'
if (( ${#hooks[*]} )); then
printf '==> Hook run order:\n'
printf ' %s\n' "${hooks[@]}"
printf '\n'
fi
else
decomp "$image" | bsdcpio -i --quiet $verbose $list
fi
# vim: set ft=sh ts=4 sw=4 et:
|
