Puppet users - May 2014 - My custom fact is overriding another fact's value

Hi all,

This, to me, is really bizarre.  Here's my code:

Facter.add("hostname_app") do
    setcode do
        hostname_app = Facter.value(:hostname)
        hostname_app[5] = 'a'
        hostname_app
    end
end

Basically, our servers have 2 network cards, and we need to set up DNS for
both of its IP addresses.  eth0 & the server's hostname is its
'management'
name, and eth1 is the server's 'application'/business network.

The management hostname and application hostname only differ by one letter,
which is what the above code is changing.

Now, when this runs, the hostname_app fact is set correctly, but the
default hostname fact is also changed similarly!  How on earth is that
happening?

I've confirmed that a normal 'facter' run has the correct hostname
set, and
removing this custom fact also keeps the hostname fact correct under a
'facter -p' run.  However, with this fact in place a 'facter -p'
run shows
the incorrect hostname fact!

Thanks,

Matt.

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