updating from 2.4(!) to modern cyrus, some tech questions

Carl Brewer <[email protected]> Thu, 9 Sep 2021 09:50:41 +1000

Newsgroups	gmane.mail.imap.cyrus
Message-ID	<[email protected]>

G'day,

I've got an old Cyrus 2.4.x install that I want to move to a more modern 
cyrus.

Reading through this :

https://www.cyrusimap.org/3.0/imap/download/upgrade.html#upgrade-by-replicating

I have used unix sep, so in place is a no-no. (why it wasn't the default 
in the first place?!)

One of the things it says is to check with mbexamine as to the format of 
the emails.

Here's an example :

Examining user/carl@XXXXXX...
  Mailbox Header Info:
   Path to mailbox: /var/spool/imap/domain/XXXXXXXX/user/carl
   Mailbox ACL: carl@XXXXXXX lrswipcda
   Unique ID: 44e86fb34ba0c00f
   User Flags: $Label5 Junk NonJunk $Forwarded $MDNSent $label1 $label2 
$label3 $
label4

  Index Header Info:
   Generation Number: 4711
   Minor Version: 12
   Header Size: 128 bytes  Record Size: 96 bytes
   Number of Messages: 10787  Mailbox Size: 950346472 bytes
   Last Append Date: (1631144700) Thu Sep  9 09:45:00 2021
   UIDValidity: 1268826127  Last UID: 709480
   Deleted: 0  Answered: 1114  Flagged: 1
   Mailbox Options: POP3_NEW_UIDL
   Last POP3 Login: (0) Thu Jan  1 10:00:00 1970
   Highest Mod Sequence: 1450920


  Message Info:
000001> UID:00099225   INT_DATE:1385363079 SENTDATE:1385341200 SIZE:1758
       > HDRSIZE:1556   LASTUPD :1385371111 SYSFLAGS:00000011 LINES:12
       > CACHEVER:3 GUID:df791095ea91d83e5aecdfc4cb3f3bcb98128cd1 
MODSEQ:135015
       > USERFLAGS: 00000000 00000000 00000000 00000000



and then it goes into each email

The minor version is good!

The doco says :

If your old installation contains mailboxes or messages that are older 
than 2.4, they may not have GUID fields in their indexes (index version 
too old), or they may have their GUID field set to zero. 3.0 will not 
accept message replications without valid matching GUIDs, so you need to 
fix this on your old installation first.

Is the  GUID field in the "Message Info" section the one that matters? 
Is it safe to assume that if the oldest messages I can find, have this, 
that the whole thing will be ok?

Thank you

Carl

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