3
# Initramfs unpacker - unpacks initramfs images into /tmp
5
# Copyright © 2013 Teddy Hogeborn
6
# Copyright © 2013 Björn Påhlsson
8
# This file is part of Mandos.
10
# Mandos is free software: you can redistribute it and/or modify it
11
# under the terms of the GNU General Public License as published by
12
# the Free Software Foundation, either version 3 of the License, or
13
# (at your option) any later version.
15
# Mandos is distributed in the hope that it will be useful,
16
# but WITHOUT ANY WARRANTY; without even the implied warranty of
17
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18
# GNU General Public License for more details.
20
# You should have received a copy of the GNU General Public License
21
# along with Mandos. If not, see
22
# <http://www.gnu.org/licenses/>.
24
# Contact the authors at <mandos@recompile.se>.
26
cpio="cpio --extract --make-directories --unconditional --preserve-modification-time"
29
set -- /boot/initrd.img-*
32
for imgfile in "$@"; do
33
if ! [ -f "$imgfile" ]; then
34
echo "Error: Not an existing file: $imgfile" >&2
37
imgdir="${TMPDIR:-/tmp}/${imgfile##*/}"
38
if [ -d "$imgdir" ]; then
39
rm --recursive -- "$imgdir"
41
mkdir --parents "$imgdir"
42
# Does this image contain microcode?
43
if $cpio --quiet --list --file="$imgfile" >/dev/null 2>&1; then
44
# Number of bytes to skip to get to the compressed archive
45
skip=$(($(LANG=C $cpio --io-size=1 --list --file="$imgfile" 2>&1 \
46
| sed --quiet --expression='s/^\([0-9]\+\) blocks$/\1/p')+8))
47
catimg="dd if=$imgfile bs=$skip skip=1 status=noxfer"
49
catimg="cat -- $imgfile"
51
# Determine the compression method
52
if { $catimg 2>/dev/null | zcat --test >/dev/null 2>&1;
53
[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
55
elif { $catimg 2>/dev/null | bzip2 --test >/dev/null 2>&1;
56
[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
57
decomp="bzip2 --stdout --decompress"
58
elif { $catimg 2>/dev/null | lzop --test >/dev/null 2>&1;
59
[ ${PIPESTATUS[-1]} -eq 0 ]; }; then
60
decomp="lzop --stdout --decompress"
62
echo "Error: Could not determine type of $imgfile" >&2
65
$catimg 2>/dev/null | $decomp | ( cd -- "$imgdir" && $cpio --quiet )
66
if [ ${PIPESTATUS[-1]} -eq 0 ]; then
67
echo "$imgfile unpacked into $imgdir"
added
removed
initramfs-unpack
