Some bits and pieces of evil GUID fiddling code

[Bron Gondwana]

Attached are:

CyrusIndex.pm - my Perl module for directly fiddling index files - it can
handle version 9 AND version 10 index files now, and even handles
up/downgrades in stream_copy now.

index_uids.pl - a simple tool for dumping the contents of an index file

guidhelper.pl - ***WARNING*** this comes with no warranty either expressed
                or implied and will probably eat your data if you don't
                use it very carefully - also won't work outside FastMail
                as-is anyway.

I'm posting these more for general interest than out of a belief anyone
else will get much use out of them.  guidhelper.pl in particular has hooks
deep into the FastMail way of doing things, though I tried to abstract the
main work component out to where people could use it if they want to spend
some time rewriting the "get folder list" bit.

I have successfully used guidhelper.pl to simulate the reconstruct
instructions given for upgrading without the IO hit of the
'reconstruct -g' on the replica.

(I'm thinking evil thoughts of a "guidmode: zero" and setting that on
 the replicas so they automatically zero during the initial upgrade, but
 that's possibly not worth the effort for a once-off for just us!) 

Enjoy,

Bron.
-- 
  Bron Gondwana
  brong at fastmail.fm

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