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 "                            If optional filenames are given, will only unpack specified files,"
  32         echo "                            else the whole image will be unpacked. Won't unpack anything from early cpio part."
  33         echo "--unpackearly               unpack the early microcode part of the initramfs."
  34         echo "                            Same as --unpack, but only unpack files from early cpio part."
  35         echo "-v, --verbose               unpack verbosely."
  36         echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
  37         echo
  38     } >&2
  39 }
  40
  41
  42 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  43
  44 sorted=0
  45 modules=0
  46 unset verbose
  47 declare -A filenames
  48
  49 unset POSIXLY_CORRECT
  50 TEMP=$(getopt \
  51     -o "vshmf:k:" \
  52     --long kver: \
  53     --long file: \
  54     --long mod \
  55     --long help \
  56     --long size \
  57     --long unpack \
  58     --long unpackearly \
  59     --long verbose \
  60     -- "$@")
  61
  62 if (( $? != 0 )); then
  63     usage
  64     exit 1
  65 fi
  66
  67 eval set -- "$TEMP"
  68
  69 while (($# > 0)); do
  70     case $1 in
  71         -k|--kver)     KERNEL_VERSION="$2"; shift;;
  72         -f|--file)     filenames[${2#/}]=1; shift;;
  73         -s|--size)     sorted=1;;
  74         -h|--help)     usage; exit 0;;
  75         -m|--mod)      modules=1;;
  76         -v|--verbose)  verbose="--verbose";;
  77         --unpack)      unpack=1;;
  78         --unpackearly) unpackearly=1;;
  79         --)            shift;break;;
  80         *)             usage; exit 1;;
  81     esac
  82     shift
  83 done
  84
  85 [[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
  86
  87 if [[ $1 ]]; then
  88     image="$1"
  89     if ! [[ -f "$image" ]]; then
  90         {
  91             echo "$image does not exist"
  92             echo
  93         } >&2
  94         usage
  95         exit 1
  96     fi
  97 else
  98     [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  99
 100     if [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
 101         && [[ $MACHINE_ID ]] \
 102         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
 103         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 104     else
 105         image="/boot/initramfs-${KERNEL_VERSION}.img"
 106     fi
 107 fi
 108
 109 shift
 110 while (($# > 0)); do
 111     filenames[${1#/}]=1;
 112     shift
 113 done
 114
 115 if ! [[ -f "$image" ]]; then
 116     {
 117         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 118         echo
 119     } >&2
 120     usage
 121     exit 1
 122 fi
 123
 124 dracutlibdirs() {
 125     for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
 126         echo "$d/$1"
 127     done
 128 }
 129
 130 extract_files()
 131 {
 132     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 133     for f in "${!filenames[@]}"; do
 134         [[ $nofileinfo ]] || echo "initramfs:/$f"
 135         [[ $nofileinfo ]] || echo "========================================================================"
 136         $CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout "$f" 2>/dev/null
 137         ((ret+=$?))
 138         [[ $nofileinfo ]] || echo "========================================================================"
 139         [[ $nofileinfo ]] || echo
 140     done
 141 }
 142
 143 list_modules()
 144 {
 145     echo "dracut modules:"
 146     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 147         $(dracutlibdirs modules.txt) 2>/dev/null
 148     ((ret+=$?))
 149 }
 150
 151 list_files()
 152 {
 153     echo "========================================================================"
 154     if [ "$sorted" -eq 1 ]; then
 155         $CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --list | sort -n -k5
 156     else
 157         $CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --list | sort -k9
 158     fi
 159     ((ret+=$?))
 160     echo "========================================================================"
 161 }
 162
 163 unpack_files()
 164 {
 165     if (( ${#filenames[@]} > 0 )); then
 166         for f in "${!filenames[@]}"; do
 167             $CAT "$image" 2>/dev/null | cpio -id --quiet $verbose $f
 168             ((ret+=$?))
 169         done
 170     else
 171         $CAT "$image" 2>/dev/null | cpio -id --quiet $verbose
 172         ((ret+=$?))
 173     fi
 174 }
 175
 176
 177 if (( ${#filenames[@]} <= 0 )) && [[ -z "$unpack" ]] && [[ -z "$unpackearly" ]]; then
 178     echo "Image: $image: $(du -h $image | while read a b || [ -n "$a" ]; do echo $a;done)"
 179     echo "========================================================================"
 180 fi
 181
 182 read -N 6 bin < "$image"
 183 case $bin in
 184     $'\x71\xc7'*|070701)
 185         CAT="cat --"
 186         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
 187         if [[ "$is_early" ]]; then
 188             if [[ -n "$unpack" ]]; then
 189                 # should use --unpackearly for early CPIO
 190                 :
 191             elif [[ -n "$unpackearly" ]]; then
 192                 unpack_files
 193             elif (( ${#filenames[@]} > 0 )); then
 194                 extract_files
 195             else
 196                 echo "Early CPIO image"
 197                 list_files
 198             fi
 199             if [[ -d "$dracutbasedir/skipcpio" ]]; then
 200                 SKIP="$dracutbasedir/skipcpio/skipcpio"
 201             else
 202                 SKIP="$dracutbasedir/skipcpio"
 203             fi
 204             if ! [[ -x $SKIP ]]; then
 205                 echo
 206                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 207                 echo
 208                 exit 0
 209             fi
 210         fi
 211         ;;
 212 esac
 213
 214 if [[ $SKIP ]] ; then
 215     bin="$($SKIP "$image" | { read -N 6 bin && echo "$bin" ; })"
 216 else
 217     read -N 6 bin < "$image"
 218 fi
 219 case $bin in
 220     $'\x1f\x8b'*)
 221         CAT="zcat --"
 222         ;;
 223     BZh*)
 224         CAT="bzcat --"
 225         ;;
 226     $'\x71\xc7'*|070701)
 227         CAT="cat --"
 228         ;;
 229     $'\x02\x21'*)
 230         CAT="lz4 -d -c"
 231         ;;
 232     $'\x89'LZO$'\0'*)
 233         CAT="lzop -d -c"
 234         ;;
 235     $'\x28\xB5\x2F\xFD'*)
 236         CAT="zstd -d -c"
 237         ;;
 238     *)
 239         if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 240             CAT="xzcat --single-stream --"
 241         else
 242             CAT="xzcat --"
 243         fi
 244         ;;
 245 esac
 246
 247 skipcpio()
 248 {
 249     $SKIP "$@" | $ORIG_CAT
 250 }
 251
 252 if [[ $SKIP ]]; then
 253     ORIG_CAT="$CAT"
 254     CAT=skipcpio
 255 fi
 256
 257 if (( ${#filenames[@]} > 1 )); then
 258     TMPFILE="$(mktemp -t --suffix=.cpio lsinitrd.XXXXXX)"
 259     $CAT "$image" 2>/dev/null > $TMPFILE
 260     trap "rm -f '$TMPFILE'" EXIT
 261     pre_decompress()
 262     {
 263         cat $TMPFILE
 264     }
 265     CAT=pre_decompress
 266 fi
 267
 268 ret=0
 269
 270 if [[ -n "$unpack" ]]; then
 271     unpack_files
 272 elif (( ${#filenames[@]} > 0 )); then
 273     extract_files
 274 else
 275     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 276         $(dracutlibdirs 'dracut-*') 2>/dev/null)
 277     ((ret+=$?))
 278     echo "Version: $version"
 279     echo
 280     if [ "$modules" -eq 1 ]; then
 281         list_modules
 282         echo "========================================================================"
 283     else
 284         echo -n "Arguments: "
 285         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 286             $(dracutlibdirs build-parameter.txt) 2>/dev/null
 287         echo
 288         list_modules
 289         list_files
 290     fi
 291 fi
 292
 293 exit $ret