[MacPorts] #63423: dbus @1.12.20_0: dscl eDSRecordAlreadyExists error on install

[MacPorts]

#63423: dbus @1.12.20_0: dscl eDSRecordAlreadyExists error on install
----------------------+--------------------
 Reporter:  mbluemer  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:
----------------------+--------------------
 Was trying to install dbus and I ran into the dscl error
 `eDSRecordAlreadyExists`:
 {{{
 ❯ sudo port install dbus
 16:47:18
 Password:
 --->  Computing dependencies for dbus
 --->  Installing dbus @1.12.20_0
 <main> attribute status: eDSRecordAlreadyExists
 <dscl_cmd> DS Error: -14135 (eDSRecordAlreadyExists)
 Error: dscl(64002) terminated with an exit status of 55
 Error: Failed to install dbus: dscl failed to create required user
 _messagebus.
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_dbus/dbus/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there is a bug.
 Error: Processing of port dbus failed
 }}}

 Running `dscl . -read /Users/_messagebus` returns `eDSRecordNotFound` so
 the user record definitely wasn't created. This was also happening to me
 with the port `postgresql10-server` and the `_postgres` user.

 I've attached the `main.log` file for review.

-- 
Ticket URL: <https://trac.macports.org/ticket/63423>
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