dovecot - Oct 2018 - doveadm backup: Error: Both source and destination mail_location points to same directory

Hello!

I'm using 2 namespaces, "inbox" for INBOX and it's subfolders
and
"special" containing folders like Sent, Junk or Drafts.??Though both
use mdbox I decided to represent those namespaces in different
locations "mdbox:~/mail" and "mdbox:~/mail_special_folders".
The main
reason to use 2 namespaces was to keep special_use folders out of INBOX
by using the prefix attribute -- it's rather cosmetic.?

??? INBOX
??????? SubFolder1
??????? SubFolder2
??????? SubFolder3
??? Sent
??? Trash
??? Drafts
??? Junk
??? Templates
??? This is Ham
??? Report Spam

Now I want to export the emails of some former users to common known
maildir or mbox format to be able to hand them over on CD. The problem
is that a conversion with doveadm backup fails. I guess this is due to
namespace special which is configured with a manual location attribute
instead of utilising mail_location. But even telling doveadm to backup
only one namespace leads to the identical error (extract of debug
message at bottom).?

As this is a RHEL7 server, the dovecot version is an old 2.2.10 and I
don't expect software debugging -- I just ask if I did some
misconfiguration or a failure in the command.
I already thought of merging the locations of both namespaces. Yet, I'm
not sure how to achieve this.?
>From /etc/dovecot/conf.d/10-mail.conf
mail_location = mdbox:~/mail

namespace inbox {
? type = private
? hidden = no
? ignore_on_failure = no
? inbox = yes
? list = yes
? location ? prefix = INBOX/
? separator = /
? subscriptions = yes
}

namespace special {
? type = private
? hidden = no
? ignore_on_failure = no
? inbox = no
? list = yes
? location = mdbox:~/mail_special_folders
? prefix =?
? separator = /
? subscriptions = yes
}


HOME is set by LDAP
user_attrs
=home=/srv/mail/%Ld/%Ln,=uid=20000,=gid=20000,imapQuota=quota_rule=*:st
orage=%$G


Identical debug messages of following commands:

# dsync -Dv backup -u bob at cs.sbg.ac.at maildir:/home/Mailexport/bob
or
# doveadm -Dv backup -u bob at cs.sbg.ac.at maildir:/home/Mailexport/bob
or
# doveadm -Dv??backup -u bob at cs.sbg.ac.at -n inbox
maildir:/home/Mailexport/bob
or?
# doveadm -Dv??backup -u bob at cs.sbg.ac.at -n special
maildir:/home/Mailexport/bob

...
doveadm(bob at cs.sbg.ac.at): Debug: Namespace inbox: type=private,
prefix=INBOX/, sep=/, inbox=yes, hidden=no, list=yes, subscriptions=yes
location=mdbox:~/mail
doveadm(bob at cs.sbg.ac.at): Debug: fs:
root=/srv/mail/cs.sbg.ac.at/bob/mail, index=, indexpvt=, control=,
inbox=, altdoveadm(bob at cs.sbg.ac.at): Debug: Namespace special: type=private,
prefix=, sep=/, inbox=no, hidden=no, list=yes, subscriptions=yes
location=mdbox:~/mail_special_folders
doveadm(bob at cs.sbg.ac.at): Debug: fs:
root=/srv/mail/cs.sbg.ac.at/bob/mail_special_folders, index=,
indexpvt=, control=, inbox=, altdoveadm(bob at cs.sbg.ac.at): Debug: Namespace
INBOX/: Using permissions
from /srv/mail/cs.sbg.ac.at/bob/mail: mode=0774 gid=default
dsync(bob at cs.sbg.ac.at): Debug: Effective uid=20000, gid=20000,
home=/srv/mail/cs.sbg.ac.at/bob
dsync(bob at cs.sbg.ac.at): Debug: Quota root: name=User quota
backend=dict args=:file:/srv/mail/cs.sbg.ac.at/bob/dovecot-quota
...
dsync(bob at cs.sbg.ac.at): Debug: Namespace inbox: type=private,
prefix=INBOX/, sep=/, inbox=yes, hidden=no, list=yes, subscriptions=yes
location=maildir:/home/Mailexport/bob
dsync(bob at cs.sbg.ac.at): Debug: maildir++: root=/home/Mailexport/bob,
index=, indexpvt=, control=, inbox=/home/Mailexport/bob, altdsync(bob at
cs.sbg.ac.at): Debug: Namespace special: type=private,
prefix=, sep=/, inbox=no, hidden=no, list=yes, subscriptions=yes
location=mdbox:~/mail_special_folders
dsync(bob at cs.sbg.ac.at): Debug: fs:
root=/srv/mail/cs.sbg.ac.at/bob/mail_special_folders, index=,
indexpvt=, control=, inbox=, altdsync(bob at cs.sbg.ac.at): Error: Both source
and destination
mail_location points to same directory:
/srv/mail/cs.sbg.ac.at/bob/mail_special_folders/mailboxes

Many thanks for any hint
Martin
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