/dev/null not a device in Linux boot image / initrd

Hello everyone!

First of all, thank you for this great project!


I stumbled over what I believe is a bug in the Linux boot image: /dev/null is not created as 
a device, and so everything that is put into it is returned when reading it.

As I see it, /dev/null is first written to in /etc/master, in the function check_z(), which 
cats /z/dosbin/install.pl to /dev/null to check its existence. But this creates a file 
named /dev/null with the contents of install.pl.

It is then read by the function write_ini_entry() in usr/lib/unatt-functions.sh on line 44, 
but unintentionally, as it is meant to truncate the temporary file: cat /dev/null > $tmp.
It then appends the original file, which usually is the unattend.txt.

This creates a very interesting unattend.txt, because this function is called five times
in usr/bin/nt5x-install (lines 184++), that means the contents of unattend.txt are the 
alternating contents of five times install.pl and unattended.txt. :)

Then on line 208 in nt5xinstall, "parse_ini_file" returns a wrong string of the value of 
"scan_windrivers_dest_map" and the copying of the drivers fails.

Strangely, this does not seem to create any problems for "normal" use, only when using
the autodetecting drivers.

A quick fix would be changing the "cat /dev/null > $tmp" in unatt-functions.sh line 44
to "echo "" > $tmp", but I think this really should be corrected by creating a working 
/dev/null.

Could someone please cross-check this?

I am not entirely sure it is a general problem and could be just be an issue with my setup. 
I use PXE booting, the Linux boot image and the nt5install script.

Sincerely,
    Johannes Singer


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