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 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  40
  41 sorted=0
  42 modules=0
  43 unset verbose
  44 declare -A filenames
  45
  46 unset POSIXLY_CORRECT
  47 TEMP=$(getopt \
  48     -o "vshmf:k:" \
  49     --long kver: \
  50     --long file: \
  51     --long mod \
  52     --long help \
  53     --long size \
  54     --long unpack \
  55     --long unpackearly \
  56     --long verbose \
  57     -- "$@")
  58
  59 if (( $? != 0 )); then
  60     usage
  61     exit 1
  62 fi
  63
  64 eval set -- "$TEMP"
  65
  66 while (($# > 0)); do
  67     case $1 in
  68         -k|--kver)     KERNEL_VERSION="$2"; shift;;
  69         -f|--file)     filenames[${2#/}]=1; shift;;
  70         -s|--size)     sorted=1;;
  71         -h|--help)     usage; exit 0;;
  72         -m|--mod)      modules=1;;
  73         -v|--verbose)  verbose="--verbose";;
  74         --unpack)      unpack=1;;
  75         --unpackearly) unpackearly=1;;
  76         --)            shift;break;;
  77         *)             usage; exit 1;;
  78     esac
  79     shift
  80 done
  81
  82 [[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
  83
  84 if [[ $1 ]]; then
  85     image="$1"
  86     if ! [[ -f "$image" ]]; then
  87         {
  88             echo "$image does not exist"
  89             echo
  90         } >&2
  91         usage
  92         exit 1
  93     fi
  94 else
  95     [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  96
  97     if [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
  98         && [[ $MACHINE_ID ]] \
  99         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
 100         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 101     else
 102         image="/boot/initramfs-${KERNEL_VERSION}.img"
 103     fi
 104 fi
 105
 106 shift
 107 while (($# > 0)); do
 108     filenames[${1#/}]=1;
 109     shift
 110 done
 111
 112 if ! [[ -f "$image" ]]; then
 113     {
 114         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 115         echo
 116     } >&2
 117     usage
 118     exit 1
 119 fi
 120
 121 dracutlibdirs() {
 122     for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
 123         echo "$d/$1"
 124     done
 125 }
 126
 127 extract_files()
 128 {
 129     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 130     for f in "${!filenames[@]}"; do
 131         [[ $nofileinfo ]] || echo "initramfs:/$f"
 132         [[ $nofileinfo ]] || echo "========================================================================"
 133         $CAT $image | cpio --extract --verbose --quiet --to-stdout $f 2>/dev/null
 134         ((ret+=$?))
 135         [[ $nofileinfo ]] || echo "========================================================================"
 136         [[ $nofileinfo ]] || echo
 137     done
 138 }
 139
 140 list_modules()
 141 {
 142     echo "dracut modules:"
 143     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 144         $(dracutlibdirs modules.txt) 2>/dev/null
 145     ((ret+=$?))
 146 }
 147
 148 list_files()
 149 {
 150     echo "========================================================================"
 151     if [ "$sorted" -eq 1 ]; then
 152         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -n -k5
 153     else
 154         $CAT "$image" | cpio --extract --verbose --quiet --list | sort -k9
 155     fi
 156     ((ret+=$?))
 157     echo "========================================================================"
 158 }
 159
 160 unpack_files()
 161 {
 162     $CAT "$image" | cpio -id --quiet $verbose
 163     ((ret+=$?))
 164 }
 165
 166
 167 if (( ${#filenames[@]} <= 0 )) && [[ -z "$unpack" ]] && [[ -z "$unpackearly" ]]; then
 168     echo "Image: $image: $(du -h $image | while read a b || [ -n "$a" ]; do echo $a;done)"
 169     echo "========================================================================"
 170 fi
 171
 172 read -N 6 bin < "$image"
 173 case $bin in
 174     $'\x71\xc7'*|070701)
 175         CAT="cat --"
 176         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
 177         if [[ "$is_early" ]]; then
 178             if [[ -n "$unpackearly" ]]; then
 179                 unpack_files
 180             elif (( ${#filenames[@]} > 0 )); then
 181                 extract_files
 182             else
 183                 echo "Early CPIO image"
 184                 list_files
 185             fi
 186             if [[ -d "$dracutbasedir/skipcpio" ]]; then
 187                 SKIP="$dracutbasedir/skipcpio/skipcpio"
 188             else
 189                 SKIP="$dracutbasedir/skipcpio"
 190             fi
 191             if ! [[ -x $SKIP ]]; then
 192                 echo
 193                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 194                 echo
 195                 exit 0
 196             fi
 197         fi
 198         ;;
 199 esac
 200
 201 if [[ $SKIP ]] ; then
 202     bin="$($SKIP "$image" | { read -N 6 bin && echo "$bin" ; })"
 203 else
 204     read -N 6 bin < "$image"
 205 fi
 206 case $bin in
 207     $'\x1f\x8b'*)
 208         CAT="zcat --"
 209         ;;
 210     BZh*)
 211         CAT="bzcat --"
 212         ;;
 213     $'\x71\xc7'*|070701)
 214         CAT="cat --"
 215         ;;
 216     $'\x02\x21'*)
 217         CAT="lz4 -d -c"
 218         ;;
 219     $'\x89'LZO$'\0'*)
 220         CAT="lzop -d -c"
 221         ;;
 222     $'0xFD2FB528'*)
 223         CAT="zstd -d -c"
 224         ;;
 225     *)
 226         if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 227             CAT="xzcat --single-stream --"
 228         else
 229             CAT="xzcat --"
 230         fi
 231         ;;
 232 esac
 233
 234 skipcpio()
 235 {
 236     $SKIP "$@" | $ORIG_CAT
 237 }
 238
 239 if [[ $SKIP ]]; then
 240     ORIG_CAT="$CAT"
 241     CAT=skipcpio
 242 fi
 243
 244 ret=0
 245
 246 if [[ -n "$unpack" ]]; then
 247     unpack_files
 248 elif (( ${#filenames[@]} > 0 )); then
 249     extract_files
 250 else
 251     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 252         $(dracutlibdirs 'dracut-*') 2>/dev/null)
 253     ((ret+=$?))
 254     echo "Version: $version"
 255     echo
 256     if [ "$modules" -eq 1 ]; then
 257         list_modules
 258         echo "========================================================================"
 259     else
 260         echo -n "Arguments: "
 261         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 262             $(dracutlibdirs build-parameter.txt) 2>/dev/null
 263         echo
 264         list_modules
 265         list_files
 266     fi
 267 fi
 268
 269 exit $ret