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 "-m, --mod                   list modules."
  31         echo "-f, --file <filename>       print the contents of <filename>."
  32         echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
  33         echo
  34     } >&2
  35 }
  36
  37
  38 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  39
  40 sorted=0
  41 modules=0
  42 declare -A filenames
  43
  44 unset POSIXLY_CORRECT
  45 TEMP=$(getopt \
  46     -o "shmf:k:" \
  47     --long kver: \
  48     --long file: \
  49     --long mod \
  50     --long help \
  51     --long size \
  52     -- "$@")
  53
  54 if (( $? != 0 )); then
  55     usage
  56     exit 1
  57 fi
  58
  59 eval set -- "$TEMP"
  60
  61 while (($# > 0)); do
  62     case $1 in
  63         -k|--kver)  KERNEL_VERSION="$2"; shift;;
  64         -f|--file)  filenames[${2#/}]=1; shift;;
  65         -s|--size)  sorted=1;;
  66         -h|--help)  usage; exit 0;;
  67         -m|--mod)   modules=1;;
  68         --)         shift;break;;
  69         *)          usage; exit 1;;
  70     esac
  71     shift
  72 done
  73
  74 [[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
  75
  76 if [[ $1 ]]; then
  77     image="$1"
  78     if ! [[ -f "$image" ]]; then
  79         {
  80             echo "$image does not exist"
  81             echo
  82         } >&2
  83         usage
  84         exit 1
  85     fi
  86 else
  87     [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  88
  89     if [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
  90         && [[ $MACHINE_ID ]] \
  91         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
  92         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  93     else
  94         image="/boot/initramfs-${KERNEL_VERSION}.img"
  95     fi
  96 fi
  97
  98 shift
  99 while (($# > 0)); do
 100     filenames[${1#/}]=1;
 101     shift
 102 done
 103
 104 if ! [[ -f "$image" ]]; then
 105     {
 106         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 107         echo
 108     } >&2
 109     usage
 110     exit 1
 111 fi
 112
 113 extract_files()
 114 {
 115     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 116     for f in ${!filenames[@]}; do
 117         [[ $nofileinfo ]] || echo "initramfs:/$f"
 118         [[ $nofileinfo ]] || echo "========================================================================"
 119         $CAT $image | cpio --extract --verbose --quiet --to-stdout $f 2>/dev/null
 120         ((ret+=$?))
 121         [[ $nofileinfo ]] || echo "========================================================================"
 122         [[ $nofileinfo ]] || echo
 123     done
 124 }
 125
 126 list_modules()
 127 {
 128     echo "dracut modules:"
 129     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/modules.txt' 'usr/lib/dracut/modules.txt' 2>/dev/null
 130     ((ret+=$?))
 131 }
 132
 133 list_files()
 134 {
 135     echo "========================================================================"
 136     if [ "$sorted" -eq 1 ]; then
 137         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -n -k5
 138     else
 139         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -k9
 140     fi
 141     ((ret+=$?))
 142     echo "========================================================================"
 143 }
 144
 145
 146 if (( ${#filenames[@]} <= 0 )); then
 147     echo "Image: $image: $(du -h $image | while read a b; do echo $a;done)"
 148     echo "========================================================================"
 149 fi
 150
 151 read -N 6 bin < "$image"
 152 case $bin in
 153     $'\x71\xc7'*|070701)
 154         CAT="cat --"
 155         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
 156         if [[ "$is_early" ]]; then
 157             if (( ${#filenames[@]} > 0 )); then
 158                 extract_files
 159             else
 160                 echo "Early CPIO image"
 161                 list_files
 162             fi
 163             SKIP="$dracutbasedir/skipcpio"
 164             if ! [[ -x $SKIP ]]; then
 165                 echo
 166                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 167                 echo
 168                 exit 0
 169             fi
 170         fi
 171         ;;
 172 esac
 173
 174 CAT=$({
 175         if [[ $SKIP ]]; then
 176             $SKIP "$image"
 177         else
 178             cat "$image"
 179         fi } | {
 180         read -N 6 bin
 181         case $bin in
 182             $'\x1f\x8b'*)
 183                 echo "zcat --"
 184                 ;;
 185             BZh*)
 186                 echo "bzcat --"
 187                 ;;
 188             $'\x71\xc7'*|070701)
 189                 echo "cat --"
 190                 ;;
 191             $'\x02\x21'*)
 192                 echo "lz4 -d -c"
 193                 ;;
 194             $'\x89'LZO$'\0'*)
 195                 echo "lzop -d -c"
 196                 ;;
 197             *)
 198                 if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 199                     echo "xzcat --single-stream --"
 200                 else
 201                     echo "xzcat --"
 202                 fi
 203                 ;;
 204         esac
 205     })
 206
 207 skipcpio()
 208 {
 209     $SKIP "$@" | $ORIG_CAT
 210 }
 211
 212 if [[ $SKIP ]]; then
 213     ORIG_CAT="$CAT"
 214     CAT=skipcpio
 215 fi
 216
 217 ret=0
 218
 219 if (( ${#filenames[@]} > 0 )); then
 220     extract_files
 221 else
 222     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/dracut-*' 'usr/lib/dracut/dracut-*' 2>/dev/null)
 223     ((ret+=$?))
 224     echo "Version: $version"
 225     echo
 226     if [ "$modules" -eq 1 ]; then
 227         list_modules
 228         echo "========================================================================"
 229     else
 230         echo -n "Arguments: "
 231         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- 'lib/dracut/build-parameter.txt' 'usr/lib/dracut/build-parameter.txt' 2>/dev/null
 232         echo
 233         list_modules
 234         list_files
 235     fi
 236 fi
 237
 238 exit $ret