user rename and uidvalidity value

[Bron Gondwana]

Yep, pretty much all that.

Of course, we now (master branch) have tombstone records in mailboxes.db which do hold the old uidvalidity for a time.

It's also not quite so hard a requirement as the RFC suggests - the RFC applies to what an authenticated user can see, and at least in theory, if you delete user B and then rename user A to user B, the password will be different, and the original user B will never be able to see those mailboxes - so it really doesn't matter that you reuse the UIDVALIDITY.

So maybe renaming an entire user is a special case.  But that would involve educating the Cyrus code about the fact that it's a user rename, right down to the low levels where the uidvalidity gets re-created.

Bron.

On Wed, Nov 5, 2014, at 10:00 PM, Vladimir Klejch wrote:
> 
> Hi
> 
> 
> partly diskussed in:
> 
> https://bugzilla.mozilla.org/show_bug.cgi?id=365651#c4
> 
> snip ---
> 
> ftp://ftp.rfc-editor.org/in-notes/rfc3501.txt
> 6.3.5.  RENAME Command
>        The value of the highest-used unique identifier of the old mailbox
>        name MUST be preserved so that a new mailbox created with the same
>        name will not reuse the identifiers of the former incarnation,
>        UNLESS the new incarnation has a different unique identifier
>        validity value.  See the description of the UID command for more
>        detail.
> 
> 
> If IMAP server returns same "unique identifier validity value" after 
> rename,  IMAP server MUST preserve "highest-used unique identifier".
> 
> snip ---
> 
> 
> 
> 
> the problem is, where to store the old "highest-used unique identifier" 
> for the same mailboxname, if reused  ??
> 
> the logical solution is to generate new uidvalidity for renamed mailbox, 
> that guarantees, that in case of existing previous mailbox with the same 
> name, that the change to other content is recognized ..
> 
> 
> 
>  		Cheers
>  					Kleo
> 
> 
> On Wed, 5 Nov 2014, Hamada, Ondrej wrote:
> 
> > Hi,
> > Can you please explain to me, why is a new value of uidvalidity generated when a user is renamed in cyrus_imapd?
> >
> > Rename:
> > A001 rename user/a at bbb.c<mailto:user/a at bbb.c>om user/x at bbb.com
> >
> > Before rename:
> > A001 select inbox
> > * OK [CLOSED] Ok
> > * 3 EXISTS
> > * 0 RECENT
> > * FLAGS (\Answered \Flagged \Draft \Deleted \Seen)
> > * OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen \*)] Ok
> > * OK [UNSEEN 2] Ok
> > * OK [UIDVALIDITY 1415092196] Ok
> > * OK [UIDNEXT 4] Ok
> > * OK [HIGHESTMODSEQ 5] Ok
> > * OK [URLMECH INTERNAL] Ok
> > A001 OK [READ-WRITE] Completed
> >
> > After rename:
> > A001 select inbox
> > * 3 EXISTS
> > * 0 RECENT
> > * FLAGS (\Answered \Flagged \Draft \Deleted \Seen)
> > * OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen \*)] Ok
> > * OK [UNSEEN 2] Ok
> > * OK [UIDVALIDITY 1415093437] Ok
> > * OK [UIDNEXT 4] Ok
> > * OK [HIGHESTMODSEQ 7] Ok
> > * OK [URLMECH INTERNAL] Ok
> > A001 OK [READ-WRITE] Completed
> >
> > Thank you in advance,
> >
> > Ondra
> >
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>    	~~	~~	~~	~~	~~	~~	~~
> Vladimir `KLEO' Klejch     	Kleo'at'netbox.cz
>  		...	...	...	...
> 
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-- 
  Bron Gondwana
  brong at fastmail.fm