[MacPorts] #21117: use_dmg yes fails to copy from some images sometimes

[MacPorts]

#21117: use_dmg yes fails to copy from some images sometimes
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 Reporter:  ryandesign@…             |       Owner:  ryandesign@…           
     Type:  defect                   |      Status:  new                    
 Priority:  Normal                   |   Milestone:                         
Component:  base                     |     Version:  1.8.0                  
 Keywords:                           |        Port:                         
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 "use_dmg yes" doesn't work if you're not root, because it wants to copy
 ''everything'' from the disk image, including things it might not have
 permission to copy, which includes things that don't need to be copied.
 Change it to copy only those files we have permission to.

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Ticket URL: <http://trac.macports.org/ticket/21117>
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