Failure building image.

```
So here is what is happening.

OS:
Linux version 3.2.6 (root@bt) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #1
SMP Fri Feb 17 10:40:05 EST 2012 32 bit.

Firmware:
http://software.cisco.com/download/release.html?mdfid=283998771&softwareid=28246
3187&release=1.3.3

Output:
./build-firmware.sh ~/112firm/squash.squashfs/ SPABUILT.bin
cat: /root/112firm/squash.squashfs/logs/config.log: No such file or directory
Firmware Mod Kit (build) 0.99, (c)2011-2013 Craig Heffner, Jeremy Collake

Preparing tools ...
Building new file system... (this may take several minutes!)
Unsupported file system ''!
Failed to create new file system! Quitting...

I extracted the firmware with a standalone version of binwalk. I have verified
the filesystem signatures are correct in the firmwaremodkit directories
binwalk/magic.

```

Original issue reported on code.google.com by `Acidchr...@gmail.com` on 11 Mar 2014 at 9:32

Start with build-firmware.sh and the reported command, then inspect why logs/config.log is missing and why the filesystem type is empty. Reproduce the build using the supplied firmware and extracted directory; done means the filesystem type is recognized and the new firmware image is created successfully.

Written by the indexing model from the issue text.