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#!/bin/sh set -eu usage() { cat << EOF Usage: unmkinitramfs [-v] initramfs-file directory Options: -v Display verbose messages about extraction See unmkinitramfs(8) for further details. EOF } usage_error() { usage >&2 exit 2 } # Extract a compressed cpio archive xcpio() { archive="$1" dir="$2" shift 2 if gzip -t "$archive" >/dev/null 2>&1 ; then gzip -c -d "$archive" elif zstd -q -c -t "$archive" >/dev/null 2>&1 ; then zstd -q -c -d "$archive" elif xzcat -t "$archive" >/dev/null 2>&1 ; then xzcat "$archive" elif lz4cat -t < "$archive" >/dev/null 2>&1 ; then lz4cat "$archive" elif bzip2 -t "$archive" >/dev/null 2>&1 ; then bzip2 -c -d "$archive" elif lzop -t "$archive" >/dev/null 2>&1 ; then lzop -c -d "$archive" # Ignoring other data, which may be garbage at the end of the file fi | ( if [ -n "$dir" ]; then mkdir -p -- "$dir" cd -- "$dir" fi cpio "$@" ) } # Read bytes out of a file, checking that they are valid hex digits readhex() { dd < "$1" bs=1 skip="$2" count="$3" 2> /dev/null | \ LANG=C grep -E "^[0-9A-Fa-f]{$3}\$" } # Check for a zero byte in a file checkzero() { dd < "$1" bs=1 skip="$2" count=1 2> /dev/null | \ LANG=C grep -q -z '^$' } # Split an initramfs into archives and call xcpio on each splitinitramfs() { initramfs="$1" dir="$2" shift 2 count=0 start=0 while true; do # There may be prepended uncompressed archives. cpio # won't tell us the true size of these so we have to # parse the headers and padding ourselves. This is # very roughly based on linux/lib/earlycpio.c end=$start while true; do if checkzero "$initramfs" $end; then # This is the EOF marker. There might # be more zero padding before the next # archive, so read through all of it. end=$((end + 4)) while checkzero "$initramfs" $end; do end=$((end + 4)) done break fi magic="$(readhex "$initramfs" $end 6)" || break test "$magic" = 070701 || test "$magic" = 070702 || break namesize=0x$(readhex "$initramfs" $((end + 94)) 8) filesize=0x$(readhex "$initramfs" $((end + 54)) 8) end=$((end + 110)) end=$(((end + namesize + 3) & ~3)) end=$(((end + filesize + 3) & ~3)) done if [ $end -eq $start ]; then break fi # Extract to early, early2, ... subdirectories count=$((count + 1)) if [ $count -eq 1 ]; then subdir=early else subdir=early$count fi dd < "$initramfs" skip=$start count=$((end - start)) iflag=skip_bytes 2> /dev/null | ( if [ -n "$dir" ]; then mkdir -p -- "$dir/$subdir" cd -- "$dir/$subdir" fi cpio -i "$@" ) start=$end done if [ "$end" -gt 0 ]; then # Extract to main subdirectory subarchive=$(mktemp "${TMPDIR:-/var/tmp}/unmkinitramfs_XXXXXX") trap 'rm -f "$subarchive"' EXIT dd < "$initramfs" skip="$end" iflag=skip_bytes 2> /dev/null \ > "$subarchive" xcpio "$subarchive" "${dir:+$dir/main}" -i "$@" else # Don't use subdirectories (for backward compatibility) xcpio "$initramfs" "$dir" -i "$@" fi } OPTIONS=$(getopt -o hv --long help,list,verbose -n "$0" -- "$@") || usage_error cpio_opts="--preserve-modification-time --no-absolute-filenames --quiet" expected_args=2 eval set -- "$OPTIONS" while true; do case "$1" in -h|--help) usage exit 0 ;; --list) # For lsinitramfs cpio_opts="${cpio_opts:+${cpio_opts} --list}" expected_args=1 shift ;; -v|--verbose) cpio_opts="${cpio_opts:+${cpio_opts} --verbose}" shift ;; --) shift break ;; *) echo "Internal error!" >&2 exit 1 esac done if [ $# -ne $expected_args ]; then usage_error fi # shellcheck disable=SC2086 splitinitramfs "$1" "${2:-}" $cpio_opts