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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
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=$1
if [[ -t 2 ]] && (( color )); then
# prefer terminal safe colored and bold text when tput is supported
if tput setaf 0 &>/dev/null; then
NC="$(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:
|
