[MacPorts] #18318: mprsyncup should clean or remove the working copy if update fails

[MacPorts]

#18318: mprsyncup should clean or remove the working copy if update fails
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 Reporter:  wsiegrist@…          |       Owner:  wsiegrist@…        
     Type:  defect               |      Status:  new                
 Priority:  Normal               |   Milestone:  Port Bugs          
Component:  server/hosting       |     Version:  1.7.0              
 Keywords:  mprsyncup            |        Port:                     
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 If mprsyncup is interrupted, it can leave behind a locked working copy.
 Subsequent mprsyncup runs will fail due to the lock. The script should
 detect this situation and try to cleanup or delete/checkout from scratch.

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Ticket URL: <http://trac.macports.org/ticket/18318>
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