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 "--unpack                    unpack the initramfs, instead of displaying the contents."
  31         echo "--unpackearly               unpack the early microcode part of the initramfs."
  32         echo "-v, --verbose               unpack verbosely."
  33         echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
  34         echo
  35     } >&2
  36 }
  37
  38
  39 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  40
  41 sorted=0
  42 modules=0
  43 unpack=0
  44 unset verbose
  45 declare -A filenames
  46
  47 unset POSIXLY_CORRECT
  48 TEMP=$(getopt \
  49     -o "vshmf:k:" \
  50     --long kver: \
  51     --long file: \
  52     --long mod \
  53     --long help \
  54     --long size \
  55     --long unpack \
  56     --long unpackearly \
  57     --long verbose \
  58     -- "$@")
  59
  60 if (( $? != 0 )); then
  61     usage
  62     exit 1
  63 fi
  64
  65 eval set -- "$TEMP"
  66
  67 while (($# > 0)); do
  68     case $1 in
  69         -k|--kver)     KERNEL_VERSION="$2"; shift;;
  70         -f|--file)     filenames[${2#/}]=1; shift;;
  71         -s|--size)     sorted=1;;
  72         -h|--help)     usage; exit 0;;
  73         -m|--mod)      modules=1;;
  74         -v|--verbose)  verbose="--verbose";;
  75         --unpack)      unpack=1;;
  76         --unpackearly) unpackearly=1;;
  77         --)            shift;break;;
  78         *)             usage; exit 1;;
  79     esac
  80     shift
  81 done
  82
  83 [[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
  84
  85 if [[ $1 ]]; then
  86     image="$1"
  87     if ! [[ -f "$image" ]]; then
  88         {
  89             echo "$image does not exist"
  90             echo
  91         } >&2
  92         usage
  93         exit 1
  94     fi
  95 else
  96     [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  97
  98     if [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
  99         && [[ $MACHINE_ID ]] \
 100         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
 101         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 102     else
 103         image="/boot/initramfs-${KERNEL_VERSION}.img"
 104     fi
 105 fi
 106
 107 shift
 108 while (($# > 0)); do
 109     filenames[${1#/}]=1;
 110     shift
 111 done
 112
 113 if ! [[ -f "$image" ]]; then
 114     {
 115         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 116         echo
 117     } >&2
 118     usage
 119     exit 1
 120 fi
 121
 122 dracutlibdirs() {
 123     for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
 124         echo "$d/$1"
 125     done
 126 }
 127
 128 extract_files()
 129 {
 130     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 131     for f in "${!filenames[@]}"; do
 132         [[ $nofileinfo ]] || echo "initramfs:/$f"
 133         [[ $nofileinfo ]] || echo "========================================================================"
 134         $CAT $image | cpio --extract --verbose --quiet --to-stdout $f 2>/dev/null
 135         ((ret+=$?))
 136         [[ $nofileinfo ]] || echo "========================================================================"
 137         [[ $nofileinfo ]] || echo
 138     done
 139 }
 140
 141 list_modules()
 142 {
 143     echo "dracut modules:"
 144     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 145         $(dracutlibdirs modules.txt) 2>/dev/null
 146     ((ret+=$?))
 147 }
 148
 149 list_files()
 150 {
 151     echo "========================================================================"
 152     if [ "$sorted" -eq 1 ]; then
 153         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -n -k5
 154     else
 155         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -k9
 156     fi
 157     ((ret+=$?))
 158     echo "========================================================================"
 159 }
 160
 161 unpack_files()
 162 {
 163     $CAT "$image" | cpio -id --quiet $verbose
 164     ((ret+=$?))
 165 }
 166
 167
 168 if (( ${#filenames[@]} <= 0 )) && [[ -z "$unpack" ]] && [[ -z "$unpackearly" ]]; then
 169     echo "Image: $image: $(du -h $image | while read a b || [ -n "$a" ]; do echo $a;done)"
 170     echo "========================================================================"
 171 fi
 172
 173 read -N 6 bin < "$image"
 174 case $bin in
 175     $'\x71\xc7'*|070701)
 176         CAT="cat --"
 177         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
 178         if [[ "$is_early" ]]; then
 179             if [[ -n "$unpackearly" ]]; then
 180                 unpack_files
 181             elif (( ${#filenames[@]} > 0 )); then
 182                 extract_files
 183             else
 184                 echo "Early CPIO image"
 185                 list_files
 186             fi
 187             SKIP="$dracutbasedir/skipcpio"
 188             if ! [[ -x $SKIP ]]; then
 189                 echo
 190                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 191                 echo
 192                 exit 0
 193             fi
 194         fi
 195         ;;
 196 esac
 197
 198 if [[ $SKIP ]] ; then
 199     bin="$($SKIP "$image" | { read -N 6 bin && echo "$bin" ; })"
 200 else
 201     read -N 6 bin < "$image"
 202 fi
 203 case $bin in
 204     $'\x1f\x8b'*)
 205         CAT="zcat --"
 206         ;;
 207     BZh*)
 208         CAT="bzcat --"
 209         ;;
 210     $'\x71\xc7'*|070701)
 211         CAT="cat --"
 212         ;;
 213     $'\x02\x21'*)
 214         CAT="lz4 -d -c"
 215         ;;
 216     $'\x89'LZO$'\0'*)
 217         CAT="lzop -d -c"
 218         ;;
 219     *)
 220         if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 221             CAT="xzcat --single-stream --"
 222         else
 223             CAT="xzcat --"
 224         fi
 225         ;;
 226 esac
 227
 228 skipcpio()
 229 {
 230     $SKIP "$@" | $ORIG_CAT
 231 }
 232
 233 if [[ $SKIP ]]; then
 234     ORIG_CAT="$CAT"
 235     CAT=skipcpio
 236 fi
 237
 238 ret=0
 239
 240 if [[ -n "$unpack" ]]; then
 241     unpack_files
 242 elif (( ${#filenames[@]} > 0 )); then
 243     extract_files
 244 else
 245     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 246         $(dracutlibdirs 'dracut-*') 2>/dev/null)
 247     ((ret+=$?))
 248     echo "Version: $version"
 249     echo
 250     if [ "$modules" -eq 1 ]; then
 251         list_modules
 252         echo "========================================================================"
 253     else
 254         echo -n "Arguments: "
 255         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 256             $(dracutlibdirs build-parameter.txt) 2>/dev/null
 257         echo
 258         list_modules
 259         list_files
 260     fi
 261 fi
 262
 263 exit $ret