[MacPorts] #56606: port -D install doesn't work for subports

[MacPorts]

#56606: port -D install doesn't work for subports
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  Reporter:  wyuenho  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  base     |    Version:  2.5.1
Resolution:           |   Keywords:
      Port:           |
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Comment (by wyuenho):

 I checked out the dir into ~/Documents and `sudo port -D ~/Documents/...`
 doesn't seem to be very happy about it, even when execing under a sudoer
 account.

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Ticket URL: <https://trac.macports.org/ticket/56606#comment:6>
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