Replication double check

[Bron Gondwana]

On Fri, May 27, 2011 at 01:07:27PM -0500, Blake Hudson wrote:
> I'm looking to create a tool that will double check replication,
> backups, and migrations to ensure that they are working correctly and no
> corruption has crept in.
> 
> The tool MUST:
>     1) Work via IMAP
>     2) Compare a single user's mailbox between 2 servers and report any
> differences between the two (this is not a one way tool)
> 
> The tool SHOULD:
>     1) Perform a comparison of the folder list, subscriptions, and ACLs
>     2) Compare the message list, message sizes, and seen state of
> messages in each folder, recursively
>     3) Compare individual messages for differences (comparing a checksum
> of fetched messages is fine). Ideally, i would like to have the option
> to perform a full check of all messages or perhaps check just the inbox
> or a random selection of messages.
>     4) Anything else?

Sounds familiar.

> Before I dig in, I searched for existing tools and found none that did
> exactly what I want. imapsync is close, but it doesn't really do what
> I'm looking for, nor is its output suitable for such a task. imapdump
> (part of the imap_tools suite) could be used as a base.
> 
> I know Bron had mentioned that he uses a tool internally to check the
> consistency of mailboxes across replicated servers. Is there an open
> tool that can do this or does anyone (including Bron) want to share
> theirs? Does anyone else besides Bron/Fastmail confirm that
> replication/backup schemes are not silently corrupting messages?

I'm sure I've posted it before.  It's not really something we keep
secret, just something that's not portable outside our environment.

Though it must be pretty close.

The bits that are specific to our setup are the _GetConnection part
and the run_sync stuff.

Bron.
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