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|
#!/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:
|
