[MacPorts] #11971: BUG: "port -u -f upgrade installed" created many nested directories

[MacPorts]

#11971: BUG: "port -u -f upgrade installed" created many nested directories
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  Reporter:  freebsd at generalresources.com  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  defect                        |      Status:  new                                  
  Priority:  High                          |   Milestone:  MacPorts base bugs                   
 Component:  base                          |     Version:  1.4                                  
Resolution:                                |    Keywords:                                       
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Changes (by jmr at macports.org):

 * cc: jmr at macports.org (added)

Comment:

 Looks like this is due to multiple invocations of fetch_init and
 archive_init, where dist_subdir is appended to distpath, and os.platform &
 os.arch are appended to archive.destpath, respectively.

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Ticket URL: <http://trac.macports.org/ticket/11971#comment:4>
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