[MacPorts] #29000: port upgrade, install... fail with "invalid command name registry::exlcusive_lock"

[MacPorts]

#29000: port upgrade, install... fail with "invalid command name
registry::exlcusive_lock"
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 Reporter:  andrew.long@…        |       Owner:  macports-tickets@…                   
     Type:  defect               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  base                 |     Version:  1.9.2                                
 Keywords:                       |        Port:                                       
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Comment(by ryandesign@…):

 You could try downloading the MacPorts 1.9.2 disk image for your OS
 version from our download page and installing it again. This will not
 affect your installed ports.

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Ticket URL: <https://trac.macports.org/ticket/29000#comment:2>
MacPorts <http://www.macports.org/>
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