grub-fstest: debug tool for filesystem driver

[Bean]

Hi,

I've written a new tool grub-fstest which can be useful in debuging
filesystem drivers. To build grub-fstest, you must use option
--enable-grub-fstest:

./configure --enable-grub-fstest

Usage:

fstest [OPTIONS] IMAGE_PATH COMMANDS

IMAGE_PATH is the absolute path to an image file, COMMANDS is one of
the following commands:

ls PATH
list files in PATH

cp SRC DEST
copy file SRC in the image file to DEST in the local system.

cmp SRC DEST
compare file SRC in the image file with DEST in the local system.

dump FILE
hexdump FILE in the image file

blst FILE
display the blocklist of FILE in the image file

Options:
-s, --skip=N
set the number of bytes to skip in command cp, cmp and dump.

-n, --length=N
set the number of bytes to process in command cp, cmp and dump.

-r, --raw
disable auto decompression

-p, --part=N
if IMAGE_FILE contain partition map, use the option to select partition.

Examples:

./grub-fstest /path/aa.iso ls /
List files in aa.iso

./grub-fstest -p 1 /path/aa.dsk cp /bb cc
Copy file /bb in the first partition of aa.dsk to cc in the current directory

./grub-fstest -p 1 /path/aa.dsk cmp /bb cc
Compare file /bb in the first partition of aa.dsk with cc in the
current directory

./grub-fstest -s 10 -n 20 /path/aa.tar dump /bb
Hexdump file /bb in aa.tar, skip 10 bytes, print 20 bytes.

./grub-fstest /path/aa.iso blst /bb
display the blocklist of file /bb in aa.iso

-- 
Bean

grub2-fstest.diff
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