How do you synchronize your notmuch tags across multiple machines?

[David Mazieres]

Jeff Templon <templon at nikhef.nl> writes:

> quote: "mbsync maintains a mapping of remote (col 1) to local (col 2) uids.
> when you migrate, you can just duplicate the columns."
>
> He's talking about migrating a mail store from offlineimap to mbsync, I
> guess the issues would be the same.

I wonder if the thing to do would be to write an mbsync-specific utility
to convert IMAP uids to notmuch properties and back.  Then maybe I could
extend muchsync to sync properties (which it currently ignores because I
wrote muchsync before properties existed, and still don't really know
what properties are good for).

A problem with syncing properties, though, is that I don't know how to
do conflict resolution correctly 100% of the time.  One of the key
insights behind muchsync is that with file names and binary flags, I
think I figured out a sane way of resolving all conflicts without
involving the user (namely take the max number of links in each
directory with special treatment for new/ and cur/, then logically and
the muchsync.and_tags, and logically or the other tags).

With properties, it's not clear how to sync them generically.  Moreover,
some properties like session-key probably should not be synced, since
you probably don't want to upload the equivalent of plaintext main
messages to your mail server.

David