destination folder is empty

[GoogleCodeExporter]

What steps will reproduce the problem?
1. call unyaffs2 source.img destination.folder

What is the expected output? What do you see instead?
I expect to find output in the folder, but its empty. The process runs without 
complain.

What version of the product are you using? On what operating system?
trunk

Please provide any additional information below.
tried it with sudo as well. and with full path without substitution as ~ or .

+++
x@xyz:~$ ~/dev/build/yaffs2utils/unyaffs2 
/media/x/6631-6634/clockworkmod/backup/2012-12-18.19.21.33/system.yaffs2.img .
unyaffs2-0.2.9: image extracting tool for YAFFS2.
warning: non-root users.

scanning image 
'/media/x/6631-6634/clockworkmod/backup/2012-12-18.19.21.33/system.yaffs2.img'..
. [done]
scanning complete, total objects: 1

building fs tree ... [done]
building complete, total objects: 1

extracting image into '.'
[======================================================================] 1/1 
100%

modify files attributes... [done]
operation complete,
files were extracted into '.'.
++++

Original issue reported on code.google.com by Karl.Seb...@gmail.com on 20 Dec 2012 at 9:24

[GoogleCodeExporter]

It was the same Result for me.
What happen there?
Is it necessary to unspare?
I tried the commands
sudo losetup /dev/loop0 boot.img
unspare2 /dev/loop0 boot.unspare

Original comment by gruenbla...@gmail.com on 9 Feb 2014 at 8:06