[MacPorts] #70016: destroot phase does not confine process to destroot directory

[MacPorts]

#70016: destroot phase does not confine process to destroot directory
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  Reporter:  mohd-akram  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  High        |  Milestone:
 Component:  base        |    Version:  2.9.3
Resolution:              |   Keywords:
      Port:              |
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Comment (by jmroot):

 Sandboxing does prevent writing outside the workpath for commands run with
 `system`, though not for native Tcl commands the Portfile may run.

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Ticket URL: <https://trac.macports.org/ticket/70016#comment:1>
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