[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 1.6.1                       
 Component:  base                          |     Version:  1.4                                  
Resolution:                                |    Keywords:                                       
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Changes (by jmr at macports.org):

  * milestone:  MacPorts base bugs => MacPorts 1.6.1

Comment:

 Unarchive could have been affected as well. The attached patch should make
 it harmless to call fetch_init, archive_init, and unarchive_init more than
 once.

 Nominating this for the upcoming release.

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Ticket URL: <http://trac.macports.org/ticket/11971#comment:5>
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