summaryrefslogtreecommitdiffstats
path: root/lsinitcpio
blob: 1d4a343274345f38163e6ebb70866214ed1bf169 (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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
#!/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
lsinitcpio %VERSION%
usage: ${0##*/} [options] <initramfs>

  Options:
   -a, --analyze        analyze contents of image
   -c, --config         show configuration file image was built with
   -h, --help           display this help
   -n, --nocolor        disable colorized output
   -v, --verbose        more verbose output
   -x, --extract        extract image to disk

USAGE
}

decomp() {
    ${compress:-cat} ${compress:+-cd} "$@"
}

. "$FUNCTIONS"

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

size_to_human() {
    awk -v size="$1" '
    BEGIN {
        suffix[1] = "B"
        suffix[2] = "KiB"
        suffix[3] = "MiB"
        suffix[4] = "GiB"
        suffix[5] = "TiB"
        count = 1

        while (size > 1024) {
            size /= 1024
            count++
        }

        sizestr = sprintf("%.2f", size)
        sub(/\.?0+$/, "", sizestr)
        printf("%s %s", sizestr, suffix[count])
    }'
}

analyze_image() {
    local -a binaries explicitmod modules foundhooks hooks
    local kernver ratio columns=$(tput cols) image=$1

    workdir=$(mktemp -d --tmpdir="$TMPDIR" lsinitcpio.XXXXXX)
    trap 'rm -rf "$workdir"' EXIT

    # fallback in case tput failed us
    columns=${columns:-80}

    zsize=$(stat -c %s "$image")

    # calculate compression ratio
    TIMEFORMAT=%R decomptime=$({ time decomp "$image" >/dev/null; } 2>&1 )
    if [[ $compress ]]; then
        fullsize=$(decomp "$image" | bsdtar xOf - | wc -c)
        ratio=.$(( zsize * 1000 / fullsize % 1000 ))
    fi

    # decompress the image since we need to read from it multiple times. we
    # have to pass this through decomp() since the image might be lzop which
    # bsdtar can't read.
    decomp "$image" | bsdtar -C "$workdir" -xf -

    # collect stats
    kernver=("$workdir"/usr/lib/modules/*/)
    kernver=${kernver%/}
    kernver=${kernver##*/}

    modules=("$workdir/usr/lib/modules/$kernver"/kernel/*.ko*)
    if [[ -f ${modules[0]} ]]; then
        modules=("${modules[@]##*/}")
        modules=("${modules[@]%.ko*}")
    else
        unset modules
    fi

    foundhooks=("$workdir"/hooks/*)
    [[ -f ${foundhooks[0]} ]] && foundhooks=("${foundhooks[@]##*/}") || unset foundhooks

    mapfile -t binaries < <(find "$workdir/usr/bin" -type f -printf %f\\n)

    read -r version < "$workdir/VERSION"

    # source and read config
    . "$workdir/config"

    explicitmod=($MODULES)

    # print results
    imagename=$image
    [[ -L $image ]] && imagename+=" -> $(readlink -e "$image")"
    msg 'Image: %s %s' "$imagename"
    [[ $version ]] && msg 'Created with mkinitcpio %s' "$version"
    msg 'Kernel: %s' "${kernver:-unknown}"
    msg 'Size: %s' "$(size_to_human "$zsize")"

    if [[ $compress ]]; then
        msg 'Compressed with: %s' "$compress"
        msg2 'Uncompressed size: %s (%s ratio)' "$(size_to_human "$fullsize")" "$ratio"
    fi
    msg2 'Estimated extraction time: %ss' "$decomptime"
    printf '\n'

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

    msg 'Included binaries:'
    printf '  %s\n' "${binaries[@]}" | sort | column -c$columns
    printf '\n'

    if [[ $EARLYHOOKS ]]; then
        msg 'Early hook run order:'
        printf '  %s\n' $EARLYHOOKS
        printf '\n'
    fi

    if [[ $HOOKS ]]; then
        msg 'Hook run order:'
        printf '  %s\n' $HOOKS
        printf '\n'
    fi

    if [[ $LATEHOOKS ]]; then
        msg 'Late hook run order:'
        printf '  %s\n' $LATEHOOKS
        printf '\n'
    fi

    if [[ $CLEANUPHOOKS ]]; then
        msg 'Cleanup hook run order:'
        printf '  %s\n' $CLEANUPHOOKS
        printf '\n'
    fi
}

OPT_SHORT='achnvx'
OPT_LONG=('analyze' 'help' 'nocolor' 'showconfig' 'verbose' 'extract')

if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then
    exit 1
fi
set -- "${OPTRET[@]}"
unset OPT_SHORT OPT_LONG OPTRET

while :; do
    case $1 in
        -a|--analyze)
            analyze=1 ;;
        -c|--config)
            showconfig=1 ;;
        -h|--help)
            usage
            exit 0 ;;
        -n|--nocolor)
            color=0 ;;
        -v|--verbose)
            verbose='--verbose' ;;
        -x|--extract)
            unset list ;;
        --)
            shift
            break 2 ;;
    esac
    shift
done

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 ]] || die "No image specified (use -h for help)"
[[ -f $image ]] || die "No such file: $image"

# read compression type
case "$(file -Lb "$image")" in
    @(data|LZMA)*) compress=lzma ;;
    gzip*) compress=gzip ;;
    bzip2*) compress=bzip2 ;;
    lzop*) compress=lzop ;;
    XZ*) compress=xz ;;
esac

if (( analyze )); then
    analyze_image "$image"
elif (( showconfig )); then
    decomp "$1" | bsdtar xOf - buildconfig 2>/dev/null ||
        die 'Failed to extract config from image (mkinitcpio too old?)'
else
    decomp "$image" | bsdcpio -i --quiet $verbose $list
fi

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