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 dracutlibdirs() {
 112     for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
 113         echo "$d/$1"
 114     done
 115 }
 116
 117 extract_files()
 118 {
 119     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 120     for f in ${!filenames[@]}; do
 121         [[ $nofileinfo ]] || echo "initramfs:/$f"
 122         [[ $nofileinfo ]] || echo "========================================================================"
 123         $CAT $image | cpio --extract --verbose --quiet --to-stdout $f 2>/dev/null
 124         ((ret+=$?))
 125         [[ $nofileinfo ]] || echo "========================================================================"
 126         [[ $nofileinfo ]] || echo
 127     done
 128 }
 129
 130 list_modules()
 131 {
 132     echo "dracut modules:"
 133     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 134         $(dracutlibdirs modules.txt) 2>/dev/null
 135     ((ret+=$?))
 136 }
 137
 138 list_files()
 139 {
 140     echo "========================================================================"
 141     if [ "$sorted" -eq 1 ]; then
 142         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -n -k5
 143     else
 144         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -k9
 145     fi
 146     ((ret+=$?))
 147     echo "========================================================================"
 148 }
 149
 150
 151 if (( ${#filenames[@]} <= 0 )); then
 152     echo "Image: $image: $(du -h $image | while read a b || [ -n "$a" ]; do echo $a;done)"
 153     echo "========================================================================"
 154 fi
 155
 156 read -N 6 bin < "$image"
 157 case $bin in
 158     $'\x71\xc7'*|070701)
 159         CAT="cat --"
 160         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
 161         if [[ "$is_early" ]]; then
 162             if (( ${#filenames[@]} > 0 )); then
 163                 extract_files
 164             else
 165                 echo "Early CPIO image"
 166                 list_files
 167             fi
 168             SKIP="$dracutbasedir/skipcpio"
 169             if ! [[ -x $SKIP ]]; then
 170                 echo
 171                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 172                 echo
 173                 exit 0
 174             fi
 175         fi
 176         ;;
 177 esac
 178
 179 CAT=$({
 180         if [[ $SKIP ]]; then
 181             $SKIP "$image"
 182         else
 183             cat "$image"
 184         fi } | {
 185         read -N 6 bin
 186         case $bin in
 187             $'\x1f\x8b'*)
 188                 echo "zcat --"
 189                 ;;
 190             BZh*)
 191                 echo "bzcat --"
 192                 ;;
 193             $'\x71\xc7'*|070701)
 194                 echo "cat --"
 195                 ;;
 196             $'\x02\x21'*)
 197                 echo "lz4 -d -c"
 198                 ;;
 199             $'\x89'LZO$'\0'*)
 200                 echo "lzop -d -c"
 201                 ;;
 202             *)
 203                 if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 204                     echo "xzcat --single-stream --"
 205                 else
 206                     echo "xzcat --"
 207                 fi
 208                 ;;
 209         esac
 210     })
 211
 212 skipcpio()
 213 {
 214     $SKIP "$@" | $ORIG_CAT
 215 }
 216
 217 if [[ $SKIP ]]; then
 218     ORIG_CAT="$CAT"
 219     CAT=skipcpio
 220 fi
 221
 222 ret=0
 223
 224 if (( ${#filenames[@]} > 0 )); then
 225     extract_files
 226 else
 227     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 228         $(dracutlibdirs 'dracut-*') 2>/dev/null)
 229     ((ret+=$?))
 230     echo "Version: $version"
 231     echo
 232     if [ "$modules" -eq 1 ]; then
 233         list_modules
 234         echo "========================================================================"
 235     else
 236         echo -n "Arguments: "
 237         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 238             $(dracutlibdirs build-parameter.txt) 2>/dev/null
 239         echo
 240         list_modules
 241         list_files
 242     fi
 243 fi
 244
 245 exit $ret