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#!/bin/bash
#
# Initramfs unpacker - unpacks initramfs images into /tmp
#
# Copyright © 2013-2019 Teddy Hogeborn
# Copyright © 2013-2019 Björn Påhlsson
#
# This file is part of Mandos.
#
# Mandos 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 3 of the License, or
# (at your option) any later version.
#
# Mandos 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 Mandos. If not, see
# <http://www.gnu.org/licenses/>.
#
# Contact the authors at <mandos@recompile.se>.
cpio="cpio --extract --make-directories --unconditional --preserve-modification-time"
if [ -z "$*" ]; then
set -- /boot/initrd.img-*
fi
for imgfile in "$@"; do
if ! [ -f "$imgfile" ]; then
echo "Error: Not an existing file: $imgfile" >&2
continue
fi
imgdir="${TMPDIR:-/tmp}/${imgfile##*/}"
if [ -d "$imgdir" ]; then
rm --recursive -- "$imgdir"
fi
mkdir --parents "$imgdir"
# Does this image contain microcode?
if $cpio --quiet --list --file="$imgfile" >/dev/null 2>&1; then
# Number of bytes to skip to get to the compressed archive
skip=$(($(LANG=C $cpio --io-size=1 --list --file="$imgfile" 2>&1 \
| sed --quiet \
--expression='s/^\([0-9]\+\) blocks$/\1/p')+8))
if [ -x /usr/lib/dracut/skipcpio ]; then
catimg="/usr/lib/dracut/skipcpio $imgfile"
else
catimg="dd if=$imgfile bs=$skip skip=1 status=noxfer"
fi
else
echo "No microcode detected"
catimg="cat -- $imgfile"
fi
while :; do
# Determine the compression method
if { $catimg 2>/dev/null | zcat --test >/dev/null 2>&1;
[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
decomp="zcat"
elif { $catimg 2>/dev/null | bzip2 --test >/dev/null 2>&1;
[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
decomp="bzip2 --stdout --decompress"
elif { $catimg 2>/dev/null | lzop --test >/dev/null 2>&1;
[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
decomp="lzop --stdout --decompress"
elif { $catimg 2>/dev/null | zstd --test >/dev/null 2>&1;
[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
decomp="zstdcat --stdout --decompress"
else
skip=$((${skip}+1))
echo "Could not determine compression of ${imgfile}; trying to skip ${skip} bytes" >&2
catimg="dd if=$imgfile bs=$skip skip=1 status=noxfer"
continue
fi
break
done
case "$catimg" in
*skipcpio*) echo "Microcode detected, skipping";;
*) echo "Microcode detected, skipping ${skip} bytes";;
esac
$catimg 2>/dev/null | $decomp | ( cd -- "$imgdir" && $cpio --quiet )
if [ ${PIPESTATUS[-1]} -eq 0 ]; then
echo "$imgfile unpacked into $imgdir"
fi
done
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