diff options
Diffstat (limited to 'lsinitrd.sh')
| -rwxr-xr-x | lsinitrd.sh | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/lsinitrd.sh b/lsinitrd.sh new file mode 100755 index 0000000..ada6cf5 --- /dev/null +++ b/lsinitrd.sh @@ -0,0 +1,397 @@ +#!/bin/bash +# +# Copyright 2005-2010 Harald Hoyer <harald@redhat.com> +# Copyright 2005-2010 Red Hat, Inc. All rights reserved. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +# + +usage() { + { + echo "Usage: ${0##*/} [options] [<initramfs file> [<filename> [<filename> [...] ]]]" + echo "Usage: ${0##*/} [options] -k <kernel version>" + echo + echo "-h, --help print a help message and exit." + echo "-s, --size sort the contents of the initramfs by size." + echo "-m, --mod list modules." + echo "-f, --file <filename> print the contents of <filename>." + echo "--unpack unpack the initramfs, instead of displaying the contents." + echo " If optional filenames are given, will only unpack specified files," + echo " else the whole image will be unpacked. Won't unpack anything from early cpio part." + echo "--unpackearly unpack the early microcode part of the initramfs." + echo " Same as --unpack, but only unpack files from early cpio part." + echo "-v, --verbose unpack verbosely." + echo "-k, --kver <kernel version> inspect the initramfs of <kernel version>." + echo + } >&2 +} + +[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut + +sorted=0 +modules=0 +unset verbose +declare -A filenames + +unset POSIXLY_CORRECT +TEMP=$(getopt \ + -o "vshmf:k:" \ + --long kver: \ + --long file: \ + --long mod \ + --long help \ + --long size \ + --long unpack \ + --long unpackearly \ + --long verbose \ + -- "$@") + +# shellcheck disable=SC2181 +if (($? != 0)); then + usage + exit 1 +fi + +eval set -- "$TEMP" + +while (($# > 0)); do + case $1 in + -k | --kver) + KERNEL_VERSION="$2" + shift + ;; + -f | --file) + filenames[${2#/}]=1 + shift + ;; + -s | --size) sorted=1 ;; + -h | --help) + usage + exit 0 + ;; + -m | --mod) modules=1 ;; + -v | --verbose) verbose="--verbose" ;; + --unpack) unpack=1 ;; + --unpackearly) unpackearly=1 ;; + --) + shift + break + ;; + *) + usage + exit 1 + ;; + esac + shift +done + +[[ $KERNEL_VERSION ]] || KERNEL_VERSION="$(uname -r)" + +if [[ $1 ]]; then + image="$1" + if ! [[ -f $image ]]; then + { + echo "$image does not exist" + echo + } >&2 + usage + exit 1 + fi +else + if [[ -d /efi/Default ]] || [[ -d /boot/Default ]] || [[ -d /boot/efi/Default ]]; then + MACHINE_ID="Default" + elif [[ -s /etc/machine-id ]]; then + read -r MACHINE_ID < /etc/machine-id + [[ $MACHINE_ID == "uninitialized" ]] && MACHINE_ID="Default" + else + MACHINE_ID="Default" + fi + + if [[ -d /efi/loader/entries || -L /efi/loader/entries ]] \ + && [[ $MACHINE_ID ]] \ + && [[ -d /efi/${MACHINE_ID} || -L /efi/${MACHINE_ID} ]]; then + image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd" + elif [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \ + && [[ $MACHINE_ID ]] \ + && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]]; then + image="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd" + elif [[ -d /boot/efi/loader/entries || -L /boot/efi/loader/entries ]] \ + && [[ $MACHINE_ID ]] \ + && [[ -d /boot/efi/${MACHINE_ID} || -L /boot/efi/${MACHINE_ID} ]]; then + image="/boot/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd" + elif [[ -f /lib/modules/${KERNEL_VERSION}/initrd ]]; then + image="/lib/modules/${KERNEL_VERSION}/initrd" + elif [[ -f /lib/modules/${KERNEL_VERSION}/initramfs.img ]]; then + image="/lib/modules/${KERNEL_VERSION}/initramfs.img" + elif [[ -f /boot/initramfs-${KERNEL_VERSION}.img ]]; then + image="/boot/initramfs-${KERNEL_VERSION}.img" + elif [[ $MACHINE_ID ]] \ + && mountpoint -q /efi; then + image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd" + elif [[ $MACHINE_ID ]] \ + && mountpoint -q /boot/efi; then + image="/boot/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd" + else + image="" + fi +fi + +shift +while (($# > 0)); do + filenames[${1#/}]=1 + shift +done + +if ! [[ -f $image ]]; then + { + echo "No <initramfs file> specified and the default image '$image' cannot be accessed!" + echo + } >&2 + usage + exit 1 +fi + +TMPDIR="$(mktemp -d -t lsinitrd.XXXXXX)" +# shellcheck disable=SC2064 +trap "rm -rf '$TMPDIR'" EXIT + +dracutlibdirs() { + for d in lib64/dracut lib/dracut usr/lib64/dracut usr/lib/dracut; do + echo "$d/$1" + done +} + +extract_files() { + ((${#filenames[@]} == 1)) && nofileinfo=1 + for f in "${!filenames[@]}"; do + [[ $nofileinfo ]] || echo "initramfs:/$f" + [[ $nofileinfo ]] || echo "========================================================================" + # shellcheck disable=SC2001 + [[ $f == *"\\x"* ]] && f=$(echo "$f" | sed 's/\\x.\{2\}/????/g') + $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --to-stdout "$f" 2> /dev/null + ((ret += $?)) + [[ $nofileinfo ]] || echo "========================================================================" + [[ $nofileinfo ]] || echo + done +} + +list_modules() { + echo "dracut modules:" + # shellcheck disable=SC2046 + $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \ + $(dracutlibdirs modules.txt) 2> /dev/null + ((ret += $?)) +} + +list_files() { + echo "========================================================================" + if [ "$sorted" -eq 1 ]; then + $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --list | sort -n -k5 + else + $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --list | sort -k9 + fi + ((ret += $?)) + echo "========================================================================" +} + +list_squash_content() { + SQUASH_IMG="squash-root.img" + SQUASH_TMPFILE="$TMPDIR/initrd.root.sqsh" + + $CAT "$image" 2> /dev/null | cpio --extract --verbose --quiet --to-stdout -- \ + $SQUASH_IMG > "$SQUASH_TMPFILE" 2> /dev/null + if [[ -s $SQUASH_TMPFILE ]]; then + echo "Squashed content ($SQUASH_IMG):" + echo "========================================================================" + unsquashfs -ll "$SQUASH_TMPFILE" | tail -n +4 + echo "========================================================================" + fi +} + +unpack_files() { + if ((${#filenames[@]} > 0)); then + for f in "${!filenames[@]}"; do + # shellcheck disable=SC2001 + [[ $f == *"\\x"* ]] && f=$(echo "$f" | sed 's/\\x.\{2\}/????/g') + $CAT "$image" 2> /dev/null | cpio -id --quiet $verbose "$f" + ((ret += $?)) + done + else + $CAT "$image" 2> /dev/null | cpio -id --quiet $verbose + ((ret += $?)) + fi +} + +read -r -N 2 bin < "$image" +if [ "$bin" = "MZ" ]; then + command -v objcopy > /dev/null || { + echo "Need 'objcopy' to unpack an UEFI executable." + exit 1 + } + objcopy \ + --dump-section .linux="$TMPDIR/vmlinuz" \ + --dump-section .initrd="$TMPDIR/initrd.img" \ + --dump-section .cmdline="$TMPDIR/cmdline.txt" \ + --dump-section .osrel="$TMPDIR/osrel.txt" \ + "$image" /dev/null + uefi="$image" + image="$TMPDIR/initrd.img" + [ -f "$image" ] || exit 1 +fi + +if ((${#filenames[@]} <= 0)) && [[ -z $unpack ]] && [[ -z $unpackearly ]]; then + if [ -n "$uefi" ]; then + echo -n "initrd in UEFI: $uefi: " + du -h "$image" | while read -r a _ || [ -n "$a" ]; do echo "$a"; done + if [ -f "$TMPDIR/osrel.txt" ]; then + name=$(sed -En '/^PRETTY_NAME/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt") + id=$(sed -En '/^ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt") + build=$(sed -En '/^BUILD_ID/ s/^\w+=["'"'"']?([^"'"'"'$]*)["'"'"']?/\1/p' "$TMPDIR/osrel.txt") + echo "OS Release: $name (${id}-${build})" + fi + if [ -f "$TMPDIR/vmlinuz" ]; then + version=$(strings -n 20 "$TMPDIR/vmlinuz" | sed -En '/[0-9]+\.[0-9]+\.[0-9]+/ { p; q 0 }') + echo "Kernel Version: $version" + fi + if [ -f "$TMPDIR/cmdline.txt" ]; then + echo "Command line:" + sed -En 's/\s+/\n/g; s/\x00/\n/; p' "$TMPDIR/cmdline.txt" + fi + else + echo -n "Image: $image: " + du -h "$image" | while read -r a _ || [ -n "$a" ]; do echo "$a"; done + fi + + echo "========================================================================" +fi + +read -r -N 6 bin < "$image" +case $bin in + $'\x71\xc7'* | 070701) + CAT="cat --" + is_early=$(cpio --extract --verbose --quiet --to-stdout -- 'early_cpio' < "$image" 2> /dev/null) + # Debian mkinitramfs does not create the file 'early_cpio', so let's check if firmware files exist + [[ "$is_early" ]] || is_early=$(cpio --list --verbose --quiet --to-stdout -- 'kernel/*/microcode/*.bin' < "$image" 2> /dev/null) + if [[ "$is_early" ]]; then + if [[ -n $unpack ]]; then + # should use --unpackearly for early CPIO + : + elif [[ -n $unpackearly ]]; then + unpack_files + elif ((${#filenames[@]} > 0)); then + extract_files + else + echo "Early CPIO image" + list_files + fi + if [[ -d "$dracutbasedir/src/skipcpio" ]]; then + SKIP="$dracutbasedir/src/skipcpio/skipcpio" + else + SKIP="$dracutbasedir/skipcpio" + fi + if ! [[ -x $SKIP ]]; then + echo + echo "'$SKIP' not found, cannot display remaining contents!" >&2 + echo + exit 0 + fi + fi + ;; +esac + +if [[ $SKIP ]]; then + bin="$($SKIP "$image" | { read -r -N 6 bin && echo "$bin"; })" +else + read -r -N 6 bin < "$image" +fi +case $bin in + $'\x1f\x8b'*) + CAT="zcat --" + ;; + BZh*) + CAT="bzcat --" + ;; + $'\x71\xc7'* | 070701) + CAT="cat --" + ;; + $'\x02\x21'*) + CAT="lz4 -d -c" + ;; + $'\x89'LZO$'\0'*) + CAT="lzop -d -c" + ;; + $'\x28\xB5\x2F\xFD'*) + CAT="zstd -d -c" + ;; + *) + if echo "test" | xz | xzcat --single-stream > /dev/null 2>&1; then + CAT="xzcat --single-stream --" + else + CAT="xzcat --" + fi + ;; +esac + +type "${CAT%% *}" > /dev/null 2>&1 || { + echo "Need '${CAT%% *}' to unpack the initramfs." + exit 1 +} + +skipcpio() { + $SKIP "$@" | $ORIG_CAT +} + +if [[ $SKIP ]]; then + ORIG_CAT="$CAT" + CAT=skipcpio +fi + +if ((${#filenames[@]} > 1)); then + TMPFILE="$TMPDIR/initrd.cpio" + $CAT "$image" 2> /dev/null > "$TMPFILE" + pre_decompress() { + cat "$TMPFILE" + } + CAT=pre_decompress +fi + +ret=0 + +if [[ -n $unpack ]]; then + unpack_files +elif ((${#filenames[@]} > 0)); then + extract_files +else + # shellcheck disable=SC2046 + version=$($CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \ + $(dracutlibdirs 'dracut-*') 2> /dev/null) + ((ret += $?)) + echo "Version: $version" + echo + if [ "$modules" -eq 1 ]; then + list_modules + echo "========================================================================" + else + echo -n "Arguments: " + # shellcheck disable=SC2046 + $CAT "$image" | cpio --extract --verbose --quiet --to-stdout -- \ + $(dracutlibdirs build-parameter.txt) 2> /dev/null + echo + list_modules + list_files + list_squash_content + fi +fi + +exit "$ret" |