Hi,
Here is the getinitramfs script itself for testing just in case patch is
inconvenient for testing.
Osamu
#!/bin/sh
set -eu
usage()
{
echo "Usage: $(basename $0) [-l] <initramfs file>"
}
if [ "$#" -eq 0 ] ; then
usage >&2
exit 1
fi
OPTIONS=`getopt -o h --long help -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
;;
--)
shift
break
;;
*)
echo "Internal error!" >&2
exit 1
esac
done
# 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
# Extract main archive
echo "Multi-segmented initramfs image: $initramfs"
dd < "$initramfs" bs="$offset" skip=1 2> /dev/null \
> $initramfs.main
echo " ==> Extracted main initramfs image:
$initramfs.main"
else
echo "Simple initramfs image: $initramfs"
fi
fi
done
