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 TMPDIR="$(mktemp -d -t lsinitrd.XXXXXX)"
 125 trap "rm -rf '$TMPDIR'" EXIT
 126
 127 dracutlibdirs() {
 128     for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
 129         echo "$d/$1"
 130     done
 131 }
 132
 133 extract_files()
 134 {
 135     (( ${#filenames[@]} == 1 )) && nofileinfo=1
 136     for f in "${!filenames[@]}"; do
 137         [[ $nofileinfo ]] || echo "initramfs:/$f"
 138         [[ $nofileinfo ]] || echo "========================================================================"
 139         $CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout "$f" 2>/dev/null
 140         ((ret+=$?))
 141         [[ $nofileinfo ]] || echo "========================================================================"
 142         [[ $nofileinfo ]] || echo
 143     done
 144 }
 145
 146 list_modules()
 147 {
 148     echo "dracut modules:"
 149     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 150         $(dracutlibdirs modules.txt) 2>/dev/null
 151     ((ret+=$?))
 152 }
 153
 154 list_files()
 155 {
 156     echo "========================================================================"
 157     if [ "$sorted" -eq 1 ]; then
 158         $CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --list | sort -n -k5
 159     else
 160         $CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --list | sort -k9
 161     fi
 162     ((ret+=$?))
 163     echo "========================================================================"
 164 }
 165
 166 list_squash_content()
 167 {
 168     SQUASH_IMG="squash/root.img"
 169     SQUASH_TMPFILE="$TMPDIR/initrd.root.sqsh"
 170
 171     $CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout -- \
 172         $SQUASH_IMG > "$SQUASH_TMPFILE" 2>/dev/null
 173     if [[ -s $SQUASH_TMPFILE ]]; then
 174         echo "Squashed content ($SQUASH_IMG):"
 175         echo "========================================================================"
 176         unsquashfs -ll "$SQUASH_TMPFILE" | tail -n +4
 177         echo "========================================================================"
 178     fi
 179 }
 180
 181 unpack_files()
 182 {
 183     if (( ${#filenames[@]} > 0 )); then
 184         for f in "${!filenames[@]}"; do
 185             $CAT "$image" 2>/dev/null | cpio -id --quiet $verbose $f
 186             ((ret+=$?))
 187         done
 188     else
 189         $CAT "$image" 2>/dev/null | cpio -id --quiet $verbose
 190         ((ret+=$?))
 191     fi
 192 }
 193
 194 read -N 2 bin < "$image"
 195 if [ "$bin" = "MZ" ]; then
 196     command -v objcopy > /dev/null || { echo "Need 'objcopy' to unpack an UEFI executable."; exit 1; }
 197     objcopy \
 198         --dump-section .linux="$TMPDIR/vmlinuz" \
 199         --dump-section .initrd="$TMPDIR/initrd.img" \
 200         --dump-section .cmdline="$TMPDIR/cmdline.txt" \
 201         --dump-section .osrel="$TMPDIR/osrel.txt" \
 202         "$image" /dev/null
 203     uefi="$image"
 204     image="$TMPDIR/initrd.img"
 205     [ -f "$image" ] || exit 1
 206 fi
 207
 208 if (( ${#filenames[@]} <= 0 )) && [[ -z "$unpack" ]] && [[ -z "$unpackearly" ]]; then
 209     if [ -n $uefi ]; then
 210         echo -n "initrd in UEFI: $uefi: "
 211         du -h $image | while read a b || [ -n "$a" ]; do echo $a;done
 212         if [ -f "$TMPDIR/osrel.txt" ]; then
 213             name=$(sed -En '/^PRETTY_NAME/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 214             id=$(sed -En '/^ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 215             build=$(sed -En '/^BUILD_ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 216             echo "OS Release: $name (${id}-${build})"
 217         fi
 218         if [ -f "$TMPDIR/vmlinuz" ]; then
 219             version=$(strings -n 20 "$TMPDIR/vmlinuz" | sed -En '/[0-9]+\.[0-9]+\.[0-9]+/ { p; q 0 }')
 220             echo "Kernel Version: $version"
 221         fi
 222         if [ -f "$TMPDIR/cmdline.txt" ]; then
 223             echo "Command line:"
 224             sed -En 's/\s+/\n/g; s/\x00/\n/; p' "$TMPDIR/cmdline.txt"
 225         fi
 226     else
 227         echo -n "Image: $image: "
 228         du -h $image | while read a b || [ -n "$a" ]; do echo $a;done
 229     fi
 230
 231     echo "========================================================================"
 232 fi
 233
 234 read -N 6 bin < "$image"
 235 case $bin in
 236     $'\x71\xc7'*|070701)
 237         CAT="cat --"
 238         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2>/dev/null)
 239         if [[ "$is_early" ]]; then
 240             if [[ -n "$unpack" ]]; then
 241                 # should use --unpackearly for early CPIO
 242                 :
 243             elif [[ -n "$unpackearly" ]]; then
 244                 unpack_files
 245             elif (( ${#filenames[@]} > 0 )); then
 246                 extract_files
 247             else
 248                 echo "Early CPIO image"
 249                 list_files
 250             fi
 251             if [[ -d "$dracutbasedir/skipcpio" ]]; then
 252                 SKIP="$dracutbasedir/skipcpio/skipcpio"
 253             else
 254                 SKIP="$dracutbasedir/skipcpio"
 255             fi
 256             if ! [[ -x $SKIP ]]; then
 257                 echo
 258                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 259                 echo
 260                 exit 0
 261             fi
 262         fi
 263         ;;
 264 esac
 265
 266 if [[ $SKIP ]] ; then
 267     bin="$($SKIP "$image" | { read -N 6 bin && echo "$bin" ; })"
 268 else
 269     read -N 6 bin < "$image"
 270 fi
 271 case $bin in
 272     $'\x1f\x8b'*)
 273         CAT="zcat --"
 274         ;;
 275     BZh*)
 276         CAT="bzcat --"
 277         ;;
 278     $'\x71\xc7'*|070701)
 279         CAT="cat --"
 280         ;;
 281     $'\x02\x21'*)
 282         CAT="lz4 -d -c"
 283         ;;
 284     $'\x89'LZO$'\0'*)
 285         CAT="lzop -d -c"
 286         ;;
 287     $'\x28\xB5\x2F\xFD'*)
 288         CAT="zstd -d -c"
 289         ;;
 290     *)
 291         if echo "test"|xz|xzcat --single-stream >/dev/null 2>&1; then
 292             CAT="xzcat --single-stream --"
 293         else
 294             CAT="xzcat --"
 295         fi
 296         ;;
 297 esac
 298
 299 skipcpio()
 300 {
 301     $SKIP "$@" | $ORIG_CAT
 302 }
 303
 304 if [[ $SKIP ]]; then
 305     ORIG_CAT="$CAT"
 306     CAT=skipcpio
 307 fi
 308
 309 if (( ${#filenames[@]} > 1 )); then
 310     TMPFILE="$TMPDIR/initrd.cpio"
 311     $CAT "$image" 2>/dev/null > $TMPFILE
 312     pre_decompress()
 313     {
 314         cat $TMPFILE
 315     }
 316     CAT=pre_decompress
 317 fi
 318
 319 ret=0
 320
 321 if [[ -n "$unpack" ]]; then
 322     unpack_files
 323 elif (( ${#filenames[@]} > 0 )); then
 324     extract_files
 325 else
 326     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 327         $(dracutlibdirs 'dracut-*') 2>/dev/null)
 328     ((ret+=$?))
 329     echo "Version: $version"
 330     echo
 331     if [ "$modules" -eq 1 ]; then
 332         list_modules
 333         echo "========================================================================"
 334     else
 335         echo -n "Arguments: "
 336         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 337             $(dracutlibdirs build-parameter.txt) 2>/dev/null
 338         echo
 339         list_modules
 340         list_files
 341         list_squash_content
 342     fi
 343 fi
 344
 345 exit $ret