[MacPorts] #47592: rev-upgrade should use prefix_unwritable check (was: rev-upgrade should always require root privileges)

[MacPorts]

#47592: rev-upgrade should use prefix_unwritable check
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  Reporter:  mp@…     |      Owner:  neverpanic
      Type:  defect   |     Status:  assigned
  Priority:  Not set  |  Milestone:
 Component:  base     |    Version:  2.3.99
Resolution:           |   Keywords:
      Port:           |
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Comment (by jmroot):

 Changing summary since MacPorts can be installed in a non-root-owned
 prefix, and in that case it can be run without root privileges and rev-
 upgrade should still work.

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Ticket URL: <https://trac.macports.org/ticket/47592#comment:8>
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