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#!/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
-h, --help display this help
-n, --nocolor disable colorized output
-v, --verbose more verbose output
-x, --extract extract image to disk
USAGE
exit 1
}
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])
}'
}
OPT_SHORT='ahnvx'
OPT_LONG=('analyze' 'help' 'nocolor' '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 ;;
-h|--help)
usage ;;
-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 ]] || usage
[[ -f $image ]] || die "$image: No such file"
# 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
declare -a binaries explicitmod modules foundhooks hooks
declare kernver ratio columns=$(tput cols)
zsize=$(stat -c %s "$image")
# calculate compression ratio
if [[ $compress ]]; then
TIMEFORMAT=%R decomptime=$({ time decomp "$image" >/dev/null; } 2>&1 )
fullsize=$(decomp "$image" | bsdtar xOf - | wc -c)
ratio=.$(( zsize * 1000 / fullsize % 1000 ))
fi
# read contents of image
while read -r line; do
if [[ $line = *.ko?(.?z) ]]; then
line=${line##*/}
modules+=("${line%.ko?(.?z)}")
elif [[ -z $kernver && $line =~ /lib/modules/([^/]+)/ ]]; then
kernver=${BASH_REMATCH[1]}
elif [[ $line = ./hooks/* ]]; then
foundhooks+=("${line##*/}")
elif [[ $line = *@(/?(s)bin/)* ]]; then
binaries+=("${line##*/}")
fi
done < <(decomp "$image" | bsdtar tf -)
read -r version < <(decomp "$image" | bsdtar xOf - VERSION 2>/dev/null)
# 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
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")" "$ratio"
msg2 'Estimated decompression time: %ss' "$decomptime"
fi
printf '\n'
if (( ${#modules[*]} )); then
msg 'Included modules:'
for mod in "${modules[@]}"; do
printf ' %s' "$mod"
in_array "${mod//_/-}" "${explicitmod[@]//_/-}" && printf ' [explicit]'
printf '\n'
done | sort | column -c$columns
printf '\n'
fi
msg 'Included binaries:'
printf ' %s\n' "${binaries[@]}" | sort | column -c$columns
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:
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