Migration issue with seen/subscription/sieve databases

Hi all,
I am tasked to migrate an old cyrus 2.3.x CentOS6 installation to a new 
CentOS8 server with cyrus 3.0.7.

I'm following the instructions at 
https://cyrusimap.org/imap/download/upgrade.html (compresive of berkeley 
db format change to skiplist) and all is mostly working, except for some 
important per-user databases: seen, subscription and sieve.

The issue basically seems one of a different file names, revolving 
around using "." (dot) instead of "^" (circumflex). For example, the old 
cyrus installation has the following per-user database structure:

[root@ceres imap]# cd /var/lib/imap; find -iname "*^*" | grep danti
./sieve/domain/a/assyoma.it/g/g^danti
./domain/a/assyoma.it/user/g/g^danti.seen
./domain/a/assyoma.it/user/g/g^danti.sub
./domain/a/assyoma.it/quota/g/user.g^danti

However the new installation simply ignores the above files, creating 
*new* empty files with "." (dot) separator, except for the quota (which 
is correctly understand and no new file was created). This means I lose 
all information about subscribed folder, seen mails and sive filtering.

A very simple workaround seems to soft-link the dot-enabled files with 
the circumflex ones, ie: "cd ./domain/a/assyoma.it/user/g/; ln -s 
g^danti.seen g.danti.seen"

I wonder if this is the right thing to do, or if I am missing something. 
Please also consider that on the old server I already had 
"unixhierarchysep: 1", matching the new 3.x default. Anyway, flipping 
that option has no effect on how cyrus names the above files.

Any suggestion to solve this problem?
Thanks.

-- 
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: [email protected] - [email protected]
GPG public key ID: FF5F32A8
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