lsinitrd.sh

   1 #!/bin/bash
   2 #
   3 # Copyright 2005-2010 Harald Hoyer <harald@redhat.com>
   4 # Copyright 2005-2010 Red Hat, Inc.  All rights reserved.
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 #
  19
  20 usage()
  21 {
  22     {
  23         echo "Usage: ${0##*/} [options] [<initramfs file> [<filename> [<filename> [...] ]]]"
  24         echo "Usage: ${0##*/} [options] -k <kernel version>"
  25         echo
  26         echo "-h, --help                  print a help message and exit."
  27         echo "-s, --size                  sort the contents of the initramfs by size."
  28         echo "-m, --mod                   list modules."
  29         echo "-f, --file <filename>       print the contents of <filename>."
  30         echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
  31         echo
  32     } >&2
  33 }
  34
  35
  36 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  37
  38 sorted=0
  39 modules=0
  40 declare -A filenames
  41
  42 unset POSIXLY_CORRECT
  43 TEMP=$(getopt \
  44     -o "shmf:k:" \
  45     --long kver: \
  46     --long file: \
  47     --long mod \
  48     --long help \
  49     --long size \
  50     -- "$@")
  51
  52 if (( $? != 0 )); then
  53     usage
  54     exit 1
  55 fi
  56
  57 eval set -- "$TEMP"
  58
  59 while (($# > 0)); do
  60     case $1 in
  61         -k|--kver)  KERNEL_VERSION="$2"; shift;;
  62         -f|--file)  filenames[${2#/}]=1; shift;;
  63         -s|--size)  sorted=1;;
  64         -h|--help)  usage; exit 0;;
  65         -m|--mod)   modules=1;;
  66         --)         shift;break;;
  67         *)          usage; exit 1;;
  68     esac
  69     shift
  70 done
  71
  72 [[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
  73
  74 if [[ $1 ]]; then
  75     image="$1"
  76     if ! [[ -f "$image" ]]; then
  77         {
  78             echo "$image does not exist"
  79             echo
  80         } >&2
  81         usage
  82         exit 1
  83     fi
  84 else
  85     [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  86
  87     if [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
  88         && [[ $MACHINE_ID ]] \
  89         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
  90         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  91     else
  92         image="/boot/initramfs-${KERNEL_VERSION}.img"
  93     fi
  94 fi
  95
  96 shift
  97 while (($# > 0)); do
  98     filenames[${1#/}]=1;
  99     shift
 100 done
 101
 102 if ! [[ -f "$image" ]]; then
 103     {
 104         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 105         echo
 106     } >&2
 107     usage
 108     exit 1
 109 fi
 110
 111 extract_files()
 112 {
 113     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 114     for f in ${!filenames[@]}; do
 115         [[ $nofileinfo ]] || echo "initramfs:/$f"
 116         [[ $nofileinfo ]] || echo "========================================================================"
 117         $CAT $image | cpio --extract --verbose --quiet --to-stdout $f 2>/dev/null
 118         ((ret+=$?))
 119         [[ $nofileinfo ]] || echo "========================================================================"
 120         [[ $nofileinfo ]] || echo
 121     done
 122 }
 123
 124 list_modules()
 125 {
 126     echo "dracut modules:"
 127     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/modules.txt' 'usr/lib/dracut/modules.txt' 2>/dev/null
 128     ((ret+=$?))
 129 }
 130
 131 list_files()
 132 {
 133     echo "========================================================================"
 134     if [ "$sorted" -eq 1 ]; then
 135         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -n -k5
 136     else
 137         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -k9
 138     fi
 139     ((ret+=$?))
 140     echo "========================================================================"
 141 }
 142
 143
 144 if (( ${#filenames[@]} <= 0 )); then
 145     echo "Image: $image: $(du -h $image | while read a b; do echo $a;done)"
 146     echo "========================================================================"
 147 fi
 148
 149 read -N 6 bin < "$image"
 150 case $bin in
 151     $'\x71\xc7'*|070701)
 152         CAT="cat --"
 153         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
 154         if [[ "$is_early" ]]; then
 155             if (( ${#filenames[@]} > 0 )); then
 156                 extract_files
 157             else
 158                 echo "Early CPIO image"
 159                 list_files
 160             fi
 161             SKIP="$dracutbasedir/skipcpio"
 162             if ! [[ -x $SKIP ]]; then
 163                 echo
 164                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 165                 echo
 166                 exit 0
 167             fi
 168         fi
 169         ;;
 170 esac
 171
 172 CAT=$({
 173         if [[ $SKIP ]]; then
 174             $SKIP "$image"
 175         else
 176             cat "$image"
 177         fi } | {
 178         read -N 6 bin
 179         case $bin in
 180             $'\x1f\x8b'*)
 181                 echo "zcat --"
 182                 ;;
 183             BZh*)
 184                 echo "bzcat --"
 185                 ;;
 186             $'\x71\xc7'*|070701)
 187                 echo "cat --"
 188                 ;;
 189             $'\x02\x21'*)
 190                 echo "lz4 -d -c"
 191                 ;;
 192             $'\x89'LZO$'\0'*)
 193                 echo "lzop -d -c"
 194                 ;;
 195             *)
 196                 if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 197                     echo "xzcat --single-stream --"
 198                 else
 199                     echo "xzcat --"
 200                 fi
 201                 ;;
 202         esac
 203     })
 204
 205 skipcpio()
 206 {
 207     $SKIP "$@" | $ORIG_CAT
 208 }
 209
 210 if [[ $SKIP ]]; then
 211     ORIG_CAT="$CAT"
 212     CAT=skipcpio
 213 fi
 214
 215 ret=0
 216
 217 if (( ${#filenames[@]} > 0 )); then
 218     extract_files
 219 else
 220     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/dracut-*' 'usr/lib/dracut/dracut-*' 2>/dev/null)
 221     ((ret+=$?))
 222     echo "Version: $version"
 223     echo
 224     if [ "$modules" -eq 1 ]; then
 225         list_modules
 226         echo "========================================================================"
 227     else
 228         echo -n "Arguments: "
 229         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/build-parameter.txt' 'usr/lib/dracut/build-parameter.txt' 2>/dev/null
 230         echo
 231         list_modules
 232         list_files
 233     fi
 234 fi
 235
 236 exit $ret