lsinitrd.sh

   1 #!/bin/bash
   2 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
   3 # ex: ts=8 sw=4 sts=4 et filetype=sh
   4 #
   5 # Copyright 2005-2010 Harald Hoyer <harald@redhat.com>
   6 # Copyright 2005-2010 Red Hat, Inc.  All rights reserved.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 usage()
  23 {
  24     {
  25         echo "Usage: ${0##*/} [options] [<initramfs file> [<filename> [<filename> [...] ]]]"
  26         echo "Usage: ${0##*/} [options] -k <kernel version>"
  27         echo
  28         echo "-h, --help                  print a help message and exit."
  29         echo "-s, --size                  sort the contents of the initramfs by size."
  30         echo "-f, --file <filename>       print the contents of <filename>."
  31         echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
  32         echo
  33     } >&2
  34 }
  35
  36
  37 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  38
  39 sorted=0
  40 declare -A filenames
  41
  42 unset POSIXLY_CORRECT
  43 TEMP=$(getopt \
  44     -o "shf:k:" \
  45     --long kver: \
  46     --long file: \
  47     --long help \
  48     --long size \
  49     -- "$@")
  50
  51 if (( $? != 0 )); then
  52     usage
  53     exit 1
  54 fi
  55
  56 eval set -- "$TEMP"
  57
  58 while (($# > 0)); do
  59     case $1 in
  60         -k|--kver)  KERNEL_VERSION="$2"; shift;;
  61         -f|--file)  filenames[${2#/}]=1; shift;;
  62         -s|--size)  sorted=1;;
  63         -h|--help)  usage; exit 0;;
  64         --)         shift;break;;
  65         *)          usage; exit 1;;
  66     esac
  67     shift
  68 done
  69
  70 [[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
  71
  72 if [[ $1 ]]; then
  73     image="$1"
  74     if ! [[ -f "$image" ]]; then
  75         {
  76             echo "$image does not exist"
  77             echo
  78         } >&2
  79         usage
  80         exit 1
  81     fi
  82 else
  83     [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  84
  85     if [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
  86         && [[ $MACHINE_ID ]] \
  87         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
  88         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  89     else
  90         image="/boot/initramfs-${KERNEL_VERSION}.img"
  91     fi
  92 fi
  93
  94 shift
  95 while (($# > 0)); do
  96     filenames[${1#/}]=1;
  97     shift
  98 done
  99
 100 if ! [[ -f "$image" ]]; then
 101     {
 102         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 103         echo
 104     } >&2
 105     usage
 106     exit 1
 107 fi
 108
 109 extract_files()
 110 {
 111     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 112     for f in ${!filenames[@]}; do
 113         [[ $nofileinfo ]] || echo "initramfs:/$f"
 114         [[ $nofileinfo ]] || echo "========================================================================"
 115         $CAT $image | cpio --extract --verbose --quiet --to-stdout $f 2>/dev/null
 116         ((ret+=$?))
 117         [[ $nofileinfo ]] || echo "========================================================================"
 118         [[ $nofileinfo ]] || echo
 119     done
 120 }
 121
 122 list_files()
 123 {
 124     echo "========================================================================"
 125     if [ "$sorted" -eq 1 ]; then
 126         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -n -k5
 127     else
 128         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -k9
 129     fi
 130     ((ret+=$?))
 131     echo "========================================================================"
 132 }
 133
 134
 135 if (( ${#filenames[@]} <= 0 )); then
 136     echo "Image: $image: $(du -h $image | while read a b; do echo $a;done)"
 137     echo "========================================================================"
 138 fi
 139
 140 read -N 6 bin < "$image"
 141 case $bin in
 142     $'\x71\xc7'*|070701)
 143         CAT="cat --"
 144         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
 145         if [[ "$is_early" ]]; then
 146             if (( ${#filenames[@]} > 0 )); then
 147                 extract_files
 148             else
 149                 echo "Early CPIO image"
 150                 list_files
 151             fi
 152             SKIP="$dracutbasedir/skipcpio"
 153             if ! [[ -x $SKIP ]]; then
 154                 echo
 155                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 156                 echo
 157                 exit 0
 158             fi
 159         fi
 160         ;;
 161 esac
 162
 163 CAT=$({
 164         if [[ $SKIP ]]; then
 165             $SKIP "$image"
 166         else
 167             cat "$image"
 168         fi } | {
 169         read -N 6 bin
 170         case $bin in
 171             $'\x1f\x8b'*)
 172                 echo "zcat --"
 173                 ;;
 174             BZh*)
 175                 echo "bzcat --"
 176                 ;;
 177             $'\x71\xc7'*|070701)
 178                 echo "cat --"
 179                 ;;
 180             $'\x02\x21'*)
 181                 echo "lz4 -d -c"
 182                 ;;
 183             *)
 184                 if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 185                     echo "xzcat --single-stream --"
 186                 else
 187                     echo "xzcat --"
 188                 fi
 189                 ;;
 190         esac
 191     })
 192
 193 skipcpio()
 194 {
 195     $SKIP "$@" | $ORIG_CAT
 196 }
 197
 198 if [[ $SKIP ]]; then
 199     ORIG_CAT="$CAT"
 200     CAT=skipcpio
 201 fi
 202
 203 ret=0
 204
 205 if (( ${#filenames[@]} > 0 )); then
 206     extract_files
 207 else
 208     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/dracut-*' 'usr/lib/dracut/dracut-*' 2>/dev/null)
 209     ((ret+=$?))
 210     echo "Version: $version"
 211     echo
 212     echo -n "Arguments: "
 213     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/build-parameter.txt' 'usr/lib/dracut/build-parameter.txt' 2>/dev/null
 214     echo
 215     echo "dracut modules:"
 216     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/modules.txt' 'usr/lib/dracut/modules.txt' 2>/dev/null
 217     ((ret+=$?))
 218     list_files
 219 fi
 220
 221 exit $ret