[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:  reopened
  Priority:  Normal      |  Milestone:  MacPorts Future
 Component:  base        |    Version:  1.8.0
Resolution:              |   Keywords:
      Port:              |
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Comment (by MarcusCalhoun-Lopez):

 I ran `port extract` on all of the Portfiles that I could find with
 `use_dmg yes` (isightcapture fscript-cli cg-toolkit osxfuse libftd2xx
 activewire mkconsole BiggerSQL gimp2-launcher gimp2-launcher).[[BR]]
 All of them succeeded on both a 10.12 machine and a 10.6 virtual machine.

 I removed the [https://github.com/macports/macports-
 base/commit/520338b8dee90750e6be533b4f8145c5947c5af7 root escalation], and
 all of them still succeeded.[[BR]]
 I should note, however, that the exit status of `find`  was sometimes 1
 with error `find: ./.Trashes: Permission denied`.[[BR]]
 The extract continued, however, because of the pipe `|` (the exit status
 of `false | true` is 0).

 I have a slight preference for removing the root escalation simply because
 it is more consistent with my setup.[[BR]]
 If we decide to keep it, however, I believe this ticket can be close.

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Ticket URL: <https://trac.macports.org/ticket/21117#comment:14>
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