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     if [[ -d /efi/Default ]] || [[ -d /boot/Default ]] || [[ -d /boot/efi/Default ]]; then
 113         MACHINE_ID="Default"
 114     elif [[ -f /etc/machine-id ]]; then
 115         read -r MACHINE_ID < /etc/machine-id
 116     else
 117         MACHINE_ID="Default"
 118     fi
 119
 120     if [[ -d /efi/loader/entries || -L /efi/loader/entries ]] \
 121         && [[ $MACHINE_ID ]] \
 122         && [[ -d /efi/${MACHINE_ID} || -L /efi/${MACHINE_ID} ]]; then
 123         image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 124     elif [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
 125         && [[ $MACHINE_ID ]] \
 126         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]]; then
 127         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 128     elif [[ -d /boot/efi/loader/entries || -L /boot/efi/loader/entries ]] \
 129         && [[ $MACHINE_ID ]] \
 130         && [[ -d /boot/efi/${MACHINE_ID} || -L /boot/efi/${MACHINE_ID} ]]; then
 131         image="/boot/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 132     elif [[ -f /lib/modules/${KERNEL_VERSION}/initrd ]]; then
 133         image="/lib/modules/${KERNEL_VERSION}/initrd"
 134     elif [[ -f /lib/modules/${KERNEL_VERSION}/initramfs.img ]]; then
 135         image="/lib/modules/${KERNEL_VERSION}/initramfs.img"
 136     elif [[ -f /boot/initramfs-${KERNEL_VERSION}.img ]]; then
 137         image="/boot/initramfs-${KERNEL_VERSION}.img"
 138     elif [[ $MACHINE_ID ]] \
 139         && mountpoint -q /efi; then
 140         image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 141     elif [[ $MACHINE_ID ]] \
 142         && mountpoint -q /boot/efi; then
 143         image="/boot/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 144     else
 145         image=""
 146     fi
 147 fi
 148
 149 shift
 150 while (($# > 0)); do
 151     filenames[${1#/}]=1
 152     shift
 153 done
 154
 155 if ! [[ -f $image ]]; then
 156     {
 157         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 158         echo
 159     } >&2
 160     usage
 161     exit 1
 162 fi
 163
 164 TMPDIR="$(mktemp -d -t lsinitrd.XXXXXX)"
 165 # shellcheck disable=SC2064
 166 trap "rm -rf '$TMPDIR'" EXIT
 167
 168 dracutlibdirs() {
 169     for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
 170         echo "$d/$1"
 171     done
 172 }
 173
 174 extract_files() {
 175     ((${#filenames[@]} == 1)) && nofileinfo=1
 176     for f in "${!filenames[@]}"; do
 177         [[ $nofileinfo ]] || echo "initramfs:/$f"
 178         [[ $nofileinfo ]] || echo "========================================================================"
 179         # shellcheck disable=SC2001
 180         [[ $f == *"\\x"* ]] && f=$(echo "$f" | sed 's/\\x.\{2\}/????/g')
 181         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --to-stdout "$f" 2> /dev/null
 182         ((ret += $?))
 183         [[ $nofileinfo ]] || echo "========================================================================"
 184         [[ $nofileinfo ]] || echo
 185     done
 186 }
 187
 188 list_modules() {
 189     echo "dracut modules:"
 190     # shellcheck disable=SC2046
 191     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 192         $(dracutlibdirs modules.txt) 2> /dev/null
 193     ((ret += $?))
 194 }
 195
 196 list_files() {
 197     echo "========================================================================"
 198     if [ "$sorted" -eq 1 ]; then
 199         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --list | sort -n -k5
 200     else
 201         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --list | sort -k9
 202     fi
 203     ((ret += $?))
 204     echo "========================================================================"
 205 }
 206
 207 list_squash_content() {
 208     SQUASH_IMG="squash-root.img"
 209     SQUASH_TMPFILE="$TMPDIR/initrd.root.sqsh"
 210
 211     $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --to-stdout -- \
 212         $SQUASH_IMG > "$SQUASH_TMPFILE" 2> /dev/null
 213     if [[ -s $SQUASH_TMPFILE ]]; then
 214         echo "Squashed content ($SQUASH_IMG):"
 215         echo "========================================================================"
 216         unsquashfs -ll "$SQUASH_TMPFILE" | tail -n +4
 217         echo "========================================================================"
 218     fi
 219 }
 220
 221 unpack_files() {
 222     if ((${#filenames[@]} > 0)); then
 223         for f in "${!filenames[@]}"; do
 224             # shellcheck disable=SC2001
 225             [[ $f == *"\\x"* ]] && f=$(echo "$f" | sed 's/\\x.\{2\}/????/g')
 226             $CAT "$image" 2> /dev/null | cpio -id --quiet $verbose "$f"
 227             ((ret += $?))
 228         done
 229     else
 230         $CAT "$image" 2> /dev/null | cpio -id --quiet $verbose
 231         ((ret += $?))
 232     fi
 233 }
 234
 235 read -r -N 2 bin < "$image"
 236 if [ "$bin" = "MZ" ]; then
 237     command -v objcopy > /dev/null || {
 238         echo "Need 'objcopy' to unpack an UEFI executable."
 239         exit 1
 240     }
 241     objcopy \
 242         --dump-section .linux="$TMPDIR/vmlinuz" \
 243         --dump-section .initrd="$TMPDIR/initrd.img" \
 244         --dump-section .cmdline="$TMPDIR/cmdline.txt" \
 245         --dump-section .osrel="$TMPDIR/osrel.txt" \
 246         "$image" /dev/null
 247     uefi="$image"
 248     image="$TMPDIR/initrd.img"
 249     [ -f "$image" ] || exit 1
 250 fi
 251
 252 if ((${#filenames[@]} <= 0)) && [[ -z $unpack ]] && [[ -z $unpackearly ]]; then
 253     if [ -n "$uefi" ]; then
 254         echo -n "initrd in UEFI: $uefi: "
 255         du -h "$image" | while read -r a _ || [ -n "$a" ]; do echo "$a"; done
 256         if [ -f "$TMPDIR/osrel.txt" ]; then
 257             name=$(sed -En '/^PRETTY_NAME/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 258             id=$(sed -En '/^ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 259             build=$(sed -En '/^BUILD_ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 260             echo "OS Release: $name (${id}-${build})"
 261         fi
 262         if [ -f "$TMPDIR/vmlinuz" ]; then
 263             version=$(strings -n 20 "$TMPDIR/vmlinuz" | sed -En '/[0-9]+\.[0-9]+\.[0-9]+/ { p; q 0 }')
 264             echo "Kernel Version: $version"
 265         fi
 266         if [ -f "$TMPDIR/cmdline.txt" ]; then
 267             echo "Command line:"
 268             sed -En 's/\s+/\n/g; s/\x00/\n/; p' "$TMPDIR/cmdline.txt"
 269         fi
 270     else
 271         echo -n "Image: $image: "
 272         du -h "$image" | while read -r a _ || [ -n "$a" ]; do echo "$a"; done
 273     fi
 274
 275     echo "========================================================================"
 276 fi
 277
 278 read -r -N 6 bin < "$image"
 279 case $bin in
 280     $'\x71\xc7'* | 070701)
 281         CAT="cat --"
 282         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2> /dev/null)
 283         # Debian mkinitramfs does not create the file 'early_cpio', so let's check if firmware files exist
 284         [[ "$is_early" ]] || is_early=$(cpio --list --verbose --quiet --to-stdout -- 'kernel/*/microcode/*.bin' < "$image" 2> /dev/null)
 285         if [[ "$is_early" ]]; then
 286             if [[ -n $unpack ]]; then
 287                 # should use --unpackearly for early CPIO
 288                 :
 289             elif [[ -n $unpackearly ]]; then
 290                 unpack_files
 291             elif ((${#filenames[@]} > 0)); then
 292                 extract_files
 293             else
 294                 echo "Early CPIO image"
 295                 list_files
 296             fi
 297             if [[ -d "$dracutbasedir/src/skipcpio" ]]; then
 298                 SKIP="$dracutbasedir/src/skipcpio/skipcpio"
 299             else
 300                 SKIP="$dracutbasedir/skipcpio"
 301             fi
 302             if ! [[ -x $SKIP ]]; then
 303                 echo
 304                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 305                 echo
 306                 exit 0
 307             fi
 308         fi
 309         ;;
 310 esac
 311
 312 if [[ $SKIP ]]; then
 313     bin="$($SKIP "$image" | { read -r -N 6 bin && echo "$bin"; })"
 314 else
 315     read -r -N 6 bin < "$image"
 316 fi
 317 case $bin in
 318     $'\x1f\x8b'*)
 319         CAT="zcat --"
 320         ;;
 321     BZh*)
 322         CAT="bzcat --"
 323         ;;
 324     $'\x71\xc7'* | 070701)
 325         CAT="cat --"
 326         ;;
 327     $'\x02\x21'*)
 328         CAT="lz4 -d -c"
 329         ;;
 330     $'\x89'LZO$'\0'*)
 331         CAT="lzop -d -c"
 332         ;;
 333     $'\x28\xB5\x2F\xFD'*)
 334         CAT="zstd -d -c"
 335         ;;
 336     *)
 337         if echo "test" | xz | xzcat --single-stream > /dev/null 2>&1; then
 338             CAT="xzcat --single-stream --"
 339         else
 340             CAT="xzcat --"
 341         fi
 342         ;;
 343 esac
 344
 345 skipcpio() {
 346     $SKIP "$@" | $ORIG_CAT
 347 }
 348
 349 if [[ $SKIP ]]; then
 350     ORIG_CAT="$CAT"
 351     CAT=skipcpio
 352 fi
 353
 354 if ((${#filenames[@]} > 1)); then
 355     TMPFILE="$TMPDIR/initrd.cpio"
 356     $CAT "$image" 2> /dev/null > "$TMPFILE"
 357     pre_decompress() {
 358         cat "$TMPFILE"
 359     }
 360     CAT=pre_decompress
 361 fi
 362
 363 ret=0
 364
 365 if [[ -n $unpack ]]; then
 366     unpack_files
 367 elif ((${#filenames[@]} > 0)); then
 368     extract_files
 369 else
 370     # shellcheck disable=SC2046
 371     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 372         $(dracutlibdirs 'dracut-*') 2> /dev/null)
 373     ((ret += $?))
 374     echo "Version: $version"
 375     echo
 376     if [ "$modules" -eq 1 ]; then
 377         list_modules
 378         echo "========================================================================"
 379     else
 380         echo -n "Arguments: "
 381         # shellcheck disable=SC2046
 382         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 383             $(dracutlibdirs build-parameter.txt) 2> /dev/null
 384         echo
 385         list_modules
 386         list_files
 387         list_squash_content
 388     fi
 389 fi
 390
 391 exit "$ret"