Mini Shell
#!/bin/bash
#
# Copyright 2005-2010 Harald Hoyer <harald@redhat.com>
# Copyright 2005-2010 Red Hat, Inc. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
usage()
{
{
echo "Usage: ${0##*/} [options] [<initramfs file> [<filename> [<filename> [...] ]]]"
echo "Usage: ${0##*/} [options] -k <kernel version>"
echo
echo "-h, --help print a help message and exit."
echo "-s, --size sort the contents of the initramfs by size."
echo "-m, --mod list modules."
echo "-f, --file <filename> print the contents of <filename>."
echo "--unpack unpack the initramfs, instead of displaying the contents."
echo " If optional filenames are given, will only unpack specified files,"
echo " else the whole image will be unpacked. Won't unpack anything from early cpio part."
echo "--unpackearly unpack the early microcode part of the initramfs."
echo " Same as --unpack, but only unpack files from early cpio part."
echo "-v, --verbose unpack verbosely."
echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
echo
} >&2
}
[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
sorted=0
modules=0
unset verbose
declare -A filenames
unset POSIXLY_CORRECT
TEMP=$(getopt \
-o "vshmf:k:" \
--long kver: \
--long file: \
--long mod \
--long help \
--long size \
--long unpack \
--long unpackearly \
--long verbose \
-- "$@")
if (( $? != 0 )); then
usage
exit 1
fi
eval set -- "$TEMP"
while (($# > 0)); do
case $1 in
-k|--kver) KERNEL_VERSION="$2"; shift;;
-f|--file) filenames[${2#/}]=1; shift;;
-s|--size) sorted=1;;
-h|--help) usage; exit 0;;
-m|--mod) modules=1;;
-v|--verbose) verbose="--verbose";;
--unpack) unpack=1;;
--unpackearly) unpackearly=1;;
--) shift;break;;
*) usage; exit 1;;
esac
shift
done
[[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
if [[ $1 ]]; then
image="$1"
if ! [[ -f "$image" ]]; then
{
echo "$image does not exist"
echo
} >&2
usage
exit 1
fi
else
[[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
if [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
&& [[ $MACHINE_ID ]] \
&& [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
else
image="/boot/initramfs-${KERNEL_VERSION}.img"
fi
fi
shift
while (($# > 0)); do
filenames[${1#/}]=1;
shift
done
if ! [[ -f "$image" ]]; then
{
echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
echo
} >&2
usage
exit 1
fi
dracutlibdirs() {
for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
echo "$d/$1"
done
}
extract_files()
{
(( ${#filenames[@]} == 1 )) && nofileinfo=1
for f in "${!filenames[@]}"; do
[[ $nofileinfo ]] || echo "initramfs:/$f"
[[ $nofileinfo ]] || echo "========================================================================"
$CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout "$f" 2>/dev/null
((ret+=$?))
[[ $nofileinfo ]] || echo "========================================================================"
[[ $nofileinfo ]] || echo
done
}
list_modules()
{
echo "dracut modules:"
$CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
$(dracutlibdirs modules.txt) 2>/dev/null
((ret+=$?))
}
list_files()
{
echo "========================================================================"
if [ "$sorted" -eq 1 ]; then
$CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --list | sort -n -k5
else
$CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --list | sort -k9
fi
((ret+=$?))
echo "========================================================================"
}
list_squash_content()
{
SQUASH_IMG="squash-root.img"
SQUASH_TMPFILE="$(mktemp -t --suffix=.root.sqsh lsinitrd.XXXXXX)"
trap "rm -f '$SQUASH_TMPFILE'" EXIT
$CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout -- \
$SQUASH_IMG > "$SQUASH_TMPFILE" 2>/dev/null
if [[ -s $SQUASH_TMPFILE ]]; then
echo "Squashed content ($SQUASH_IMG):"
echo "========================================================================"
unsquashfs -ll "$SQUASH_TMPFILE" | tail -n +4
echo "========================================================================"
fi
}
unpack_files()
{
if (( ${#filenames[@]} > 0 )); then
for f in "${!filenames[@]}"; do
$CAT "$image" 2>/dev/null | cpio -id --quiet $verbose $f
((ret+=$?))
done
else
$CAT "$image" 2>/dev/null | cpio -id --quiet $verbose
((ret+=$?))
fi
}
if (( ${#filenames[@]} <= 0 )) && [[ -z "$unpack" ]] && [[ -z "$unpackearly" ]]; then
echo "Image: $image: $(du -h $image | while read a b || [ -n "$a" ]; do echo $a;done)"
echo "========================================================================"
fi
read -N 6 bin < "$image"
case $bin in
$'\x71\xc7'*|070701)
CAT="cat --"
is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
if [[ "$is_early" ]]; then
if [[ -n "$unpack" ]]; then
# should use --unpackearly for early CPIO
:
elif [[ -n "$unpackearly" ]]; then
unpack_files
elif (( ${#filenames[@]} > 0 )); then
extract_files
else
echo "Early CPIO image"
list_files
fi
if [[ -d "$dracutbasedir/skipcpio" ]]; then
SKIP="$dracutbasedir/skipcpio/skipcpio"
else
SKIP="$dracutbasedir/skipcpio"
fi
if ! [[ -x $SKIP ]]; then
echo
echo "'$SKIP' not found, cannot display remaining contents!" >&2
echo
exit 0
fi
fi
;;
esac
if [[ $SKIP ]] ; then
bin="$($SKIP "$image" | { read -N 6 bin && echo "$bin" ; })"
else
read -N 6 bin < "$image"
fi
case $bin in
$'\x1f\x8b'*)
CAT="zcat --"
;;
BZh*)
CAT="bzcat --"
;;
$'\x71\xc7'*|070701)
CAT="cat --"
;;
$'\x02\x21'*)
CAT="lz4 -d -c"
;;
$'\x89'LZO$'\0'*)
CAT="lzop -d -c"
;;
$'\x28\xB5\x2F\xFD'*)
CAT="zstd -d -c"
;;
*)
if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
CAT="xzcat --single-stream --"
else
CAT="xzcat --"
fi
;;
esac
skipcpio()
{
$SKIP "$@" | $ORIG_CAT
}
if [[ $SKIP ]]; then
ORIG_CAT="$CAT"
CAT=skipcpio
fi
if (( ${#filenames[@]} > 1 )); then
TMPFILE="$(mktemp -t --suffix=.cpio lsinitrd.XXXXXX)"
$CAT "$image" 2>/dev/null > $TMPFILE
trap "rm -f '$TMPFILE'" EXIT
pre_decompress()
{
cat $TMPFILE
}
CAT=pre_decompress
fi
ret=0
if [[ -n "$unpack" ]]; then
unpack_files
elif (( ${#filenames[@]} > 0 )); then
extract_files
else
version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
$(dracutlibdirs 'dracut-*') 2>/dev/null)
((ret+=$?))
echo "Version: $version"
echo
if [ "$modules" -eq 1 ]; then
list_modules
echo "========================================================================"
else
echo -n "Arguments: "
$CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
$(dracutlibdirs build-parameter.txt) 2>/dev/null
echo
list_modules
list_files
list_squash_content
fi
fi
exit $ret
Zerion Mini Shell 1.0