summaryrefslogtreecommitdiffstats
path: root/lsinitcpio
blob: 95c05001fdbebc238a619cfdecc4febd77b1efe1 (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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
#!/bin/bash
#
# lsinitcpio - dump the contents of an initramfs image
#

shopt -s extglob

declare verbose=
declare list='--list'
declare -i color=1
declare NC= BOLD= BLUE= GREEN= RED= YELLOW=
declare FUNCTIONS=functions

usage() {
    cat<<USAGE
lsinitramfs %VERSION%
usage: ${0##*/} [options] <initramfs>

  Options:
   -a             analyze contents
   -h             display this help
   -n             disable colorized output
   -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} ${compress:+-cd} "$@"
}

. "$FUNCTIONS"

# override the die method from functions
die() {
    error "$@"
    exit 1
}

while getopts ':ahnvx' flag; do
    case $flag in
        a) analyze=1 ;;
        h) usage ;;
        n) color=0 ;;
        v) verbose='--verbose'  ;;
        x) unset list ;;
        \?) die "invalid option -- '$OPTARG'" ;;
    esac
done
shift $(( OPTIND - 1 ))

declare image=$1

if [[ -t 1 ]] && (( color )); then
    # prefer terminal safe colored and bold text when tput is supported
    if tput setaf 0 &>/dev/null; then
        NC="$(tput sgr0)"
        BOLD="$(tput bold)"
        BLUE="$BOLD$(tput setaf 4)"
        GREEN="$BOLD$(tput setaf 2)"
        RED="$BOLD$(tput setaf 1)"
        YELLOW="$BOLD$(tput setaf 3)"
    else
        NC="\e[1;0m"
        BOLD="\e[1;1m"
        BLUE="$BOLD\e[1;34m"
        GREEN="$BOLD\e[1;32m"
        RED="$BOLD\e[1;31m"
        YELLOW="$BOLD\e[1;33m"
    fi
fi
readonly NC BOLD BLUE GREEN RED YELLOW

[[ $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
    msg 'Image: %s' "$(readlink -e "$image")"
    msg 'Kernel: %s' "${kernver:-unknown}"

    if [[ $compress ]]; then
        msg 'Compressed with: %s' "$compress"
        msg2 'Compression ratio: %s' "$ratio"
        msg2 'Estimated decompression time: %ss' "$decomptime"
    fi
    printf '\n'

    if (( ${#modules[*]} )); then
        msg 'Included modules:'
        for mod in "${modules[@]}"; do
            printf '  %s' "$mod"
            in_array "${mod//_/-}" "${explicitmod[@]//_/-}" && printf ' [explicit]'
            printf '\n'
        done | sort | column -c$(tput cols)
        printf '\n'
    fi

    msg 'Included binaries:'
    printf '  %s\n' "${binaries[@]}"
    printf '\n'

    if (( ${#hooks[*]} )); then
        msg 'Hook run order:'
        printf '  %s\n' "${hooks[@]}"
        printf '\n'
    fi
else
    decomp "$image" | bsdcpio -i --quiet $verbose $list
fi

# vim: set ft=sh ts=4 sw=4 et: