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         echo "Usage: ${0##*/} [options] [<initramfs file> [<filename> [<filename> [...] ]]]"
  23         echo "Usage: ${0##*/} [options] -k <kernel version>"
  24         echo
  25         echo "-h, --help                  print a help message and exit."
  26         echo "-s, --size                  sort the contents of the initramfs by size."
  27         echo "-m, --mod                   list modules."
  28         echo "-f, --file <filename>       print the contents of <filename>."
  29         echo "--unpack                    unpack the initramfs, instead of displaying the contents."
  30         echo "                            If optional filenames are given, will only unpack specified files,"
  31         echo "                            else the whole image will be unpacked. Won't unpack anything from early cpio part."
  32         echo "--unpackearly               unpack the early microcode part of the initramfs."
  33         echo "                            Same as --unpack, but only unpack files from early cpio part."
  34         echo "-v, --verbose               unpack verbosely."
  35         echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>."
  36         echo
  37     } >&2
  38 }
  39
  40 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  41
  42 sorted=0
  43 modules=0
  44 unset verbose
  45 declare -A filenames
  46
  47 unset POSIXLY_CORRECT
  48 TEMP=$(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     -- "$@")
  59
  60 # shellcheck disable=SC2181
  61 if (($? != 0)); then
  62     usage
  63     exit 1
  64 fi
  65
  66 eval set -- "$TEMP"
  67
  68 while (($# > 0)); do
  69     case $1 in
  70         -k | --kver)
  71             KERNEL_VERSION="$2"
  72             shift
  73             ;;
  74         -f | --file)
  75             filenames[${2#/}]=1
  76             shift
  77             ;;
  78         -s | --size) sorted=1 ;;
  79         -h | --help)
  80             usage
  81             exit 0
  82             ;;
  83         -m | --mod) modules=1 ;;
  84         -v | --verbose) verbose="--verbose" ;;
  85         --unpack) unpack=1 ;;
  86         --unpackearly) unpackearly=1 ;;
  87         --)
  88             shift
  89             break
  90             ;;
  91         *)
  92             usage
  93             exit 1
  94             ;;
  95     esac
  96     shift
  97 done
  98
  99 [[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)"
 100
 101 if [[ $1 ]]; then
 102     image="$1"
 103     if ! [[ -f $image ]]; then
 104         {
 105             echo "$image does not exist"
 106             echo
 107         } >&2
 108         usage
 109         exit 1
 110     fi
 111 else
 112     [[ -f /etc/machine-id ]] && read -r MACHINE_ID < /etc/machine-id
 113
 114     if [[ -d /efi/loader/entries || -L /efi/loader/entries ]] \
 115         && [[ $MACHINE_ID ]] \
 116         && [[ -d /efi/${MACHINE_ID} || -L /efi/${MACHINE_ID} ]]; then
 117         image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 118     elif [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
 119         && [[ $MACHINE_ID ]] \
 120         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]]; then
 121         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 122     else
 123         image="/boot/initramfs-${KERNEL_VERSION}.img"
 124     fi
 125 fi
 126
 127 shift
 128 while (($# > 0)); do
 129     filenames[${1#/}]=1
 130     shift
 131 done
 132
 133 if ! [[ -f $image ]]; then
 134     {
 135         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 136         echo
 137     } >&2
 138     usage
 139     exit 1
 140 fi
 141
 142 TMPDIR="$(mktemp -d -t lsinitrd.XXXXXX)"
 143 # shellcheck disable=SC2064
 144 trap "rm -rf '$TMPDIR'" EXIT
 145
 146 dracutlibdirs() {
 147     for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
 148         echo "$d/$1"
 149     done
 150 }
 151
 152 extract_files() {
 153     ((${#filenames[@]} == 1)) && nofileinfo=1
 154     for f in "${!filenames[@]}"; do
 155         [[ $nofileinfo ]] || echo "initramfs:/$f"
 156         [[ $nofileinfo ]] || echo "========================================================================"
 157         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --to-stdout "$f" 2> /dev/null
 158         ((ret += $?))
 159         [[ $nofileinfo ]] || echo "========================================================================"
 160         [[ $nofileinfo ]] || echo
 161     done
 162 }
 163
 164 list_modules() {
 165     echo "dracut modules:"
 166     # shellcheck disable=SC2046
 167     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 168         $(dracutlibdirs modules.txt) 2> /dev/null
 169     ((ret += $?))
 170 }
 171
 172 list_files() {
 173     echo "========================================================================"
 174     if [ "$sorted" -eq 1 ]; then
 175         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --list | sort -n -k5
 176     else
 177         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --list | sort -k9
 178     fi
 179     ((ret += $?))
 180     echo "========================================================================"
 181 }
 182
 183 list_squash_content() {
 184     SQUASH_IMG="squash-root.img"
 185     SQUASH_TMPFILE="$TMPDIR/initrd.root.sqsh"
 186
 187     $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --to-stdout -- \
 188         $SQUASH_IMG > "$SQUASH_TMPFILE" 2> /dev/null
 189     if [[ -s $SQUASH_TMPFILE ]]; then
 190         echo "Squashed content ($SQUASH_IMG):"
 191         echo "========================================================================"
 192         unsquashfs -ll "$SQUASH_TMPFILE" | tail -n +4
 193         echo "========================================================================"
 194     fi
 195 }
 196
 197 unpack_files() {
 198     if ((${#filenames[@]} > 0)); then
 199         for f in "${!filenames[@]}"; do
 200             $CAT "$image" 2> /dev/null | cpio -id --quiet $verbose $f
 201             ((ret += $?))
 202         done
 203     else
 204         $CAT "$image" 2> /dev/null | cpio -id --quiet $verbose
 205         ((ret += $?))
 206     fi
 207 }
 208
 209 read -r -N 2 bin < "$image"
 210 if [ "$bin" = "MZ" ]; then
 211     command -v objcopy > /dev/null || {
 212         echo "Need 'objcopy' to unpack an UEFI executable."
 213         exit 1
 214     }
 215     objcopy \
 216         --dump-section .linux="$TMPDIR/vmlinuz" \
 217         --dump-section .initrd="$TMPDIR/initrd.img" \
 218         --dump-section .cmdline="$TMPDIR/cmdline.txt" \
 219         --dump-section .osrel="$TMPDIR/osrel.txt" \
 220         "$image" /dev/null
 221     uefi="$image"
 222     image="$TMPDIR/initrd.img"
 223     [ -f "$image" ] || exit 1
 224 fi
 225
 226 if ((${#filenames[@]} <= 0)) && [[ -z $unpack ]] && [[ -z $unpackearly ]]; then
 227     if [ -n "$uefi" ]; then
 228         echo -n "initrd in UEFI: $uefi: "
 229         du -h "$image" | while read -r a _ || [ -n "$a" ]; do echo "$a"; done
 230         if [ -f "$TMPDIR/osrel.txt" ]; then
 231             name=$(sed -En '/^PRETTY_NAME/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 232             id=$(sed -En '/^ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 233             build=$(sed -En '/^BUILD_ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 234             echo "OS Release: $name (${id}-${build})"
 235         fi
 236         if [ -f "$TMPDIR/vmlinuz" ]; then
 237             version=$(strings -n 20 "$TMPDIR/vmlinuz" | sed -En '/[0-9]+\.[0-9]+\.[0-9]+/ { p; q 0 }')
 238             echo "Kernel Version: $version"
 239         fi
 240         if [ -f "$TMPDIR/cmdline.txt" ]; then
 241             echo "Command line:"
 242             sed -En 's/\s+/\n/g; s/\x00/\n/; p' "$TMPDIR/cmdline.txt"
 243         fi
 244     else
 245         echo -n "Image: $image: "
 246         du -h "$image" | while read -r a _ || [ -n "$a" ]; do echo "$a"; done
 247     fi
 248
 249     echo "========================================================================"
 250 fi
 251
 252 read -r -N 6 bin < "$image"
 253 case $bin in
 254     $'\x71\xc7'* | 070701)
 255         CAT="cat --"
 256         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2> /dev/null)
 257         # Debian mkinitramfs does not create the file 'early_cpio', so let's check if firmware files exist
 258         [[ "$is_early" ]] || is_early=$(cpio --list --verbose --quiet --to-stdout -- 'kernel/*/microcode/*.bin' < "$image" 2> /dev/null)
 259         if [[ "$is_early" ]]; then
 260             if [[ -n $unpack ]]; then
 261                 # should use --unpackearly for early CPIO
 262                 :
 263             elif [[ -n $unpackearly ]]; then
 264                 unpack_files
 265             elif ((${#filenames[@]} > 0)); then
 266                 extract_files
 267             else
 268                 echo "Early CPIO image"
 269                 list_files
 270             fi
 271             if [[ -d "$dracutbasedir/skipcpio" ]]; then
 272                 SKIP="$dracutbasedir/skipcpio/skipcpio"
 273             else
 274                 SKIP="$dracutbasedir/skipcpio"
 275             fi
 276             if ! [[ -x $SKIP ]]; then
 277                 echo
 278                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 279                 echo
 280                 exit 0
 281             fi
 282         fi
 283         ;;
 284 esac
 285
 286 if [[ $SKIP ]]; then
 287     bin="$($SKIP "$image" | { read -r -N 6 bin && echo "$bin"; })"
 288 else
 289     read -r -N 6 bin < "$image"
 290 fi
 291 case $bin in
 292     $'\x1f\x8b'*)
 293         CAT="zcat --"
 294         ;;
 295     BZh*)
 296         CAT="bzcat --"
 297         ;;
 298     $'\x71\xc7'* | 070701)
 299         CAT="cat --"
 300         ;;
 301     $'\x02\x21'*)
 302         CAT="lz4 -d -c"
 303         ;;
 304     $'\x89'LZO$'\0'*)
 305         CAT="lzop -d -c"
 306         ;;
 307     $'\x28\xB5\x2F\xFD'*)
 308         CAT="zstd -d -c"
 309         ;;
 310     *)
 311         if echo "test" | xz | xzcat --single-stream > /dev/null 2>&1; then
 312             CAT="xzcat --single-stream --"
 313         else
 314             CAT="xzcat --"
 315         fi
 316         ;;
 317 esac
 318
 319 skipcpio() {
 320     $SKIP "$@" | $ORIG_CAT
 321 }
 322
 323 if [[ $SKIP ]]; then
 324     ORIG_CAT="$CAT"
 325     CAT=skipcpio
 326 fi
 327
 328 if ((${#filenames[@]} > 1)); then
 329     TMPFILE="$TMPDIR/initrd.cpio"
 330     $CAT "$image" 2> /dev/null > "$TMPFILE"
 331     pre_decompress() {
 332         cat "$TMPFILE"
 333     }
 334     CAT=pre_decompress
 335 fi
 336
 337 ret=0
 338
 339 if [[ -n $unpack ]]; then
 340     unpack_files
 341 elif ((${#filenames[@]} > 0)); then
 342     extract_files
 343 else
 344     # shellcheck disable=SC2046
 345     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 346         $(dracutlibdirs 'dracut-*') 2> /dev/null)
 347     ((ret += $?))
 348     echo "Version: $version"
 349     echo
 350     if [ "$modules" -eq 1 ]; then
 351         list_modules
 352         echo "========================================================================"
 353     else
 354         echo -n "Arguments: "
 355         # shellcheck disable=SC2046
 356         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 357             $(dracutlibdirs build-parameter.txt) 2> /dev/null
 358         echo
 359         list_modules
 360         list_files
 361         list_squash_content
 362     fi
 363 fi
 364
 365 exit "$ret"