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#!/bin/sh
set -eu
usage()
{
echo "Usage: $(basename $0) [-l] <initramfs file>"
}
if [ "$#" -eq 0 ] ; then
usage >&2
exit 1
fi
cpio_args="--extract --quiet --list"
OPTIONS=`getopt -o hl --long help,long -n "$0" -- "$@"`
# Check for non-GNU getopt
if [ $? != 0 ] ; then echo "W: non-GNU getopt" >&2 ; exit 1 ; fi
eval set -- "$OPTIONS"
while true; do
case "$1" in
-h|--help)
usage
exit 0
;;
-l|--long)
cpio_args="${cpio_args:+${cpio_args} --verbose}"
shift
;;
--)
shift
break
;;
*)
echo "Internal error!" >&2
exit 1
esac
done
listarchive()
{
archive="$1"
if zcat -t "${archive}" >/dev/null 2>&1 ; then
zcat "${archive}" | cpio ${cpio_args}
elif xzcat -t "${archive}" >/dev/null 2>&1 ; then
xzcat "${archive}" | cpio ${cpio_args}
elif bzip2 -t "${archive}" >/dev/null 2>&1 ; then
bzip2 -c -d "${archive}" | cpio ${cpio_args}
elif lzop -t "${archive}" >/dev/null 2>&1 ; then
lzop -c -d "${archive}" | cpio ${cpio_args}
fi
}
# 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="$2" count=1 2> /dev/null | \
LANG=C grep -q -z '^$'
}
for initramfs in "$@" ; do
if ! [ -r "${initramfs}" ] ; then
echo "Specified file could not be read." >&2
exit 1
else
echo "${initramfs}"
# There may be a prepended uncompressed archive. cpio
# won't tell us the true size of this so we have to
# parse the headers and padding ourselves. This is
# very roughly based on linux/lib/earlycpio.c
offset=0
while true; do
if checkzero "$initramfs" $offset; then
offset=$((offset + 4))
continue
fi
magic="$(readhex "$initramfs" $offset 6)" || break
test $magic = 070701 || test $magic = 070702 || break
namesize=0x$(readhex "$initramfs" $((offset + 94)) 8)
filesize=0x$(readhex "$initramfs" $((offset + 54)) 8)
offset=$(((offset + 110)))
offset=$(((offset + $namesize + 3) & ~3))
offset=$(((offset + $filesize + 3) & ~3))
done
if [ $offset -ne 0 ]; then
# List uncompressed archive
cpio ${cpio_args} < "$initramfs"
# List main archive
subarchive=$(mktemp ${TMPDIR:-/var/tmp}/lsinitramfs_XXXXXX)
trap "rm -f $subarchive" EXIT
dd < "$initramfs" bs="$offset" skip=1 2> /dev/null \
> $subarchive
listarchive $subarchive
else
listarchive "${initramfs}"
fi
fi
done
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