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 [[ -s /etc/machine-id ]]; then
 115         read -r MACHINE_ID < /etc/machine-id
 116         [[ $MACHINE_ID == "uninitialized" ]] && MACHINE_ID="Default"
 117     else
 118         MACHINE_ID="Default"
 119     fi
 120
 121     if [[ -d /efi/loader/entries || -L /efi/loader/entries ]] \
 122         && [[ $MACHINE_ID ]] \
 123         && [[ -d /efi/${MACHINE_ID} || -L /efi/${MACHINE_ID} ]]; then
 124         image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 125     elif [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
 126         && [[ $MACHINE_ID ]] \
 127         && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]]; then
 128         image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 129     elif [[ -d /boot/efi/loader/entries || -L /boot/efi/loader/entries ]] \
 130         && [[ $MACHINE_ID ]] \
 131         && [[ -d /boot/efi/${MACHINE_ID} || -L /boot/efi/${MACHINE_ID} ]]; then
 132         image="/boot/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 133     elif [[ -f /lib/modules/${KERNEL_VERSION}/initrd ]]; then
 134         image="/lib/modules/${KERNEL_VERSION}/initrd"
 135     elif [[ -f /lib/modules/${KERNEL_VERSION}/initramfs.img ]]; then
 136         image="/lib/modules/${KERNEL_VERSION}/initramfs.img"
 137     elif [[ -f /boot/initramfs-${KERNEL_VERSION}.img ]]; then
 138         image="/boot/initramfs-${KERNEL_VERSION}.img"
 139     elif [[ $MACHINE_ID ]] \
 140         && mountpoint -q /efi; then
 141         image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 142     elif [[ $MACHINE_ID ]] \
 143         && mountpoint -q /boot/efi; then
 144         image="/boot/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
 145     else
 146         image=""
 147     fi
 148 fi
 149
 150 shift
 151 while (($# > 0)); do
 152     filenames[${1#/}]=1
 153     shift
 154 done
 155
 156 if ! [[ -f $image ]]; then
 157     {
 158         echo "No <initramfs file> specified and the default image '$image' cannot be accessed!"
 159         echo
 160     } >&2
 161     usage
 162     exit 1
 163 fi
 164
 165 TMPDIR="$(mktemp -d -t lsinitrd.XXXXXX)"
 166 # shellcheck disable=SC2064
 167 trap "rm -rf '$TMPDIR'" EXIT
 168
 169 dracutlibdirs() {
 170     for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do
 171         echo "$d/$1"
 172     done
 173 }
 174
 175 extract_files() {
 176     ((${#filenames[@]} == 1)) && nofileinfo=1
 177     for f in "${!filenames[@]}"; do
 178         [[ $nofileinfo ]] || echo "initramfs:/$f"
 179         [[ $nofileinfo ]] || echo "========================================================================"
 180         # shellcheck disable=SC2001
 181         [[ $f == *"\\x"* ]] && f=$(echo "$f" | sed 's/\\x.\{2\}/????/g')
 182         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --to-stdout "$f" 2> /dev/null
 183         ((ret += $?))
 184         [[ $nofileinfo ]] || echo "========================================================================"
 185         [[ $nofileinfo ]] || echo
 186     done
 187 }
 188
 189 list_modules() {
 190     echo "dracut modules:"
 191     # shellcheck disable=SC2046
 192     $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 193         $(dracutlibdirs modules.txt) 2> /dev/null
 194     ((ret += $?))
 195 }
 196
 197 list_files() {
 198     echo "========================================================================"
 199     if [ "$sorted" -eq 1 ]; then
 200         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --list | sort -n -k5
 201     else
 202         $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --list | sort -k9
 203     fi
 204     ((ret += $?))
 205     echo "========================================================================"
 206 }
 207
 208 list_squash_content() {
 209     SQUASH_IMG="squash-root.img"
 210     SQUASH_TMPFILE="$TMPDIR/initrd.root.sqsh"
 211
 212     $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --to-stdout -- \
 213         $SQUASH_IMG > "$SQUASH_TMPFILE" 2> /dev/null
 214     if [[ -s $SQUASH_TMPFILE ]]; then
 215         echo "Squashed content ($SQUASH_IMG):"
 216         echo "========================================================================"
 217         unsquashfs -ll "$SQUASH_TMPFILE" | tail -n +4
 218         echo "========================================================================"
 219     fi
 220 }
 221
 222 unpack_files() {
 223     if ((${#filenames[@]} > 0)); then
 224         for f in "${!filenames[@]}"; do
 225             # shellcheck disable=SC2001
 226             [[ $f == *"\\x"* ]] && f=$(echo "$f" | sed 's/\\x.\{2\}/????/g')
 227             $CAT "$image" 2> /dev/null | cpio -id --quiet $verbose "$f"
 228             ((ret += $?))
 229         done
 230     else
 231         $CAT "$image" 2> /dev/null | cpio -id --quiet $verbose
 232         ((ret += $?))
 233     fi
 234 }
 235
 236 read -r -N 2 bin < "$image"
 237 if [ "$bin" = "MZ" ]; then
 238     command -v objcopy > /dev/null || {
 239         echo "Need 'objcopy' to unpack an UEFI executable."
 240         exit 1
 241     }
 242     objcopy \
 243         --dump-section .linux="$TMPDIR/vmlinuz" \
 244         --dump-section .initrd="$TMPDIR/initrd.img" \
 245         --dump-section .cmdline="$TMPDIR/cmdline.txt" \
 246         --dump-section .osrel="$TMPDIR/osrel.txt" \
 247         "$image" /dev/null
 248     uefi="$image"
 249     image="$TMPDIR/initrd.img"
 250     [ -f "$image" ] || exit 1
 251 fi
 252
 253 if ((${#filenames[@]} <= 0)) && [[ -z $unpack ]] && [[ -z $unpackearly ]]; then
 254     if [ -n "$uefi" ]; then
 255         echo -n "initrd in UEFI: $uefi: "
 256         du -h "$image" | while read -r a _ || [ -n "$a" ]; do echo "$a"; done
 257         if [ -f "$TMPDIR/osrel.txt" ]; then
 258             name=$(sed -En '/^PRETTY_NAME/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 259             id=$(sed -En '/^ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 260             build=$(sed -En '/^BUILD_ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt")
 261             echo "OS Release: $name (${id}-${build})"
 262         fi
 263         if [ -f "$TMPDIR/vmlinuz" ]; then
 264             version=$(strings -n 20 "$TMPDIR/vmlinuz" | sed -En '/[0-9]+\.[0-9]+\.[0-9]+/ { p; q 0 }')
 265             echo "Kernel Version: $version"
 266         fi
 267         if [ -f "$TMPDIR/cmdline.txt" ]; then
 268             echo "Command line:"
 269             sed -En 's/\s+/\n/g; s/\x00/\n/; p' "$TMPDIR/cmdline.txt"
 270         fi
 271     else
 272         echo -n "Image: $image: "
 273         du -h "$image" | while read -r a _ || [ -n "$a" ]; do echo "$a"; done
 274     fi
 275
 276     echo "========================================================================"
 277 fi
 278
 279 read -r -N 6 bin < "$image"
 280 case $bin in
 281     $'\x71\xc7'* | 070701)
 282         CAT="cat --"
 283         is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2> /dev/null)
 284         # Debian mkinitramfs does not create the file 'early_cpio', so let's check if firmware files exist
 285         [[ "$is_early" ]] || is_early=$(cpio --list --verbose --quiet --to-stdout -- 'kernel/*/microcode/*.bin' < "$image" 2> /dev/null)
 286         if [[ "$is_early" ]]; then
 287             if [[ -n $unpack ]]; then
 288                 # should use --unpackearly for early CPIO
 289                 :
 290             elif [[ -n $unpackearly ]]; then
 291                 unpack_files
 292             elif ((${#filenames[@]} > 0)); then
 293                 extract_files
 294             else
 295                 echo "Early CPIO image"
 296                 list_files
 297             fi
 298             if [[ -d "$dracutbasedir/src/skipcpio" ]]; then
 299                 SKIP="$dracutbasedir/src/skipcpio/skipcpio"
 300             else
 301                 SKIP="$dracutbasedir/skipcpio"
 302             fi
 303             if ! [[ -x $SKIP ]]; then
 304                 echo
 305                 echo "'$SKIP' not found, cannot display remaining contents!" >&2
 306                 echo
 307                 exit 0
 308             fi
 309         fi
 310         ;;
 311 esac
 312
 313 if [[ $SKIP ]]; then
 314     bin="$($SKIP "$image" | { read -r -N 6 bin && echo "$bin"; })"
 315 else
 316     read -r -N 6 bin < "$image"
 317 fi
 318 case $bin in
 319     $'\x1f\x8b'*)
 320         CAT="zcat --"
 321         ;;
 322     BZh*)
 323         CAT="bzcat --"
 324         ;;
 325     $'\x71\xc7'* | 070701)
 326         CAT="cat --"
 327         ;;
 328     $'\x02\x21'*)
 329         CAT="lz4 -d -c"
 330         ;;
 331     $'\x89'LZO$'\0'*)
 332         CAT="lzop -d -c"
 333         ;;
 334     $'\x28\xB5\x2F\xFD'*)
 335         CAT="zstd -d -c"
 336         ;;
 337     *)
 338         if echo "test" | xz | xzcat --single-stream > /dev/null 2>&1; then
 339             CAT="xzcat --single-stream --"
 340         else
 341             CAT="xzcat --"
 342         fi
 343         ;;
 344 esac
 345
 346 type "${CAT%% *}" > /dev/null 2>&1 || {
 347     echo "Need '${CAT%% *}' to unpack the initramfs."
 348     exit 1
 349 }
 350
 351 skipcpio() {
 352     $SKIP "$@" | $ORIG_CAT
 353 }
 354
 355 if [[ $SKIP ]]; then
 356     ORIG_CAT="$CAT"
 357     CAT=skipcpio
 358 fi
 359
 360 if ((${#filenames[@]} > 1)); then
 361     TMPFILE="$TMPDIR/initrd.cpio"
 362     $CAT "$image" 2> /dev/null > "$TMPFILE"
 363     pre_decompress() {
 364         cat "$TMPFILE"
 365     }
 366     CAT=pre_decompress
 367 fi
 368
 369 ret=0
 370
 371 if [[ -n $unpack ]]; then
 372     unpack_files
 373 elif ((${#filenames[@]} > 0)); then
 374     extract_files
 375 else
 376     # shellcheck disable=SC2046
 377     version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 378         $(dracutlibdirs 'dracut-*') 2> /dev/null)
 379     ((ret += $?))
 380     echo "Version: $version"
 381     echo
 382     if [ "$modules" -eq 1 ]; then
 383         list_modules
 384         echo "========================================================================"
 385     else
 386         echo -n "Arguments: "
 387         # shellcheck disable=SC2046
 388         $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \
 389             $(dracutlibdirs build-parameter.txt) 2> /dev/null
 390         echo
 391         list_modules
 392         list_files
 393         list_squash_content
 394     fi
 395 fi
 396
 397 exit "$ret"