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#!/bin/bash
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
#
# 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 "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
echo
} >&2
}
[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
sorted=0
modules=0
declare -A filenames
unset POSIXLY_CORRECT
TEMP=$(getopt \
-o "shmf:k:" \
--long kver: \
--long file: \
--long mod \
--long help \
--long size \
-- "$@")
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;;
--) 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
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" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/modules.txt' 'usr/lib/dracut/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 "========================================================================"
}
if (( ${#filenames[@]} <= 0 )); then
echo "Image: $image: $(du -h $image | while read a b; 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 (( ${#filenames[@]} > 0 )); then
extract_files
else
echo "Early CPIO image"
list_files
fi
SKIP="$dracutbasedir/skipcpio"
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"
;;
*)
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
ret=0
if (( ${#filenames[@]} > 0 )); then
extract_files
else
version=$($CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/dracut-*' 'usr/lib/dracut/dracut-*' 2>/dev/null)
((ret+=$?))
echo "Version: $version"
echo
if [ "$modules" -eq 1 ]; then
list_modules
echo "========================================================================"
else
echo -n "Arguments: "
$CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/build-parameter.txt' 'usr/lib/dracut/build-parameter.txt' 2>/dev/null
echo
list_modules
list_files
fi
fi
exit $ret
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