[Dovecot] Quota Calculation seems to be wrong when using dsync

[Thomas Leuxner]

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Recently I encountered odd quota increases when using 'dsync' with the latest and greatest: 2.0.8 (89936539e3b8).

Say you got something in place like this:

plugin {
  quota = dict:user::file:%h/mdbox/dovecot-quota
  quota_rule = *:storage=1GB
  quota_rule2 = Trash:storage=+10%%
}

Kick off a manual backup:

$ dsync -u user at domain.tld backup mdbox:/<path to backup>/mdbox

This results in doubling the quota for the backed up user. It doesn't seem to matter whether 'mirror' or 'backup' mode is used, both increase the "source" quota. Doesn't sound right to me. You can only get to the "real" usage by running a recalc manually:

$ doveadm quota recalc -u user at domain.tld

Anyone else seen this?

Regards
Thomas

P.S. Merry Christmas
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