[MacPorts] #55575: port -vst install fails with "/usr/bin/tar: No such file or directory"

[MacPorts]

#55575: port -vst install fails with "/usr/bin/tar: No such file or directory"
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  Reporter:  janstary  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  base      |    Version:  2.4.99
Resolution:            |   Keywords:  highsierra
      Port:            |
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Comment (by neverpanic):

 Yeah, I believe the intent of the original change was to use
 COPYFILE_CLONE so that no additional storage would be required on APFS.

 Since Apple now intentionally broke their own API, we only have the option
 of following the symlinks ourselves, or going back to the old model that
 requires double the storage.

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Ticket URL: <https://trac.macports.org/ticket/55575#comment:9>
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