[MacPorts] #40035: base aborts if current directory does not exist, even when given a port name

[MacPorts]

#40035: base aborts if current directory does not exist, even when given a port
name
---------------------+--------------------
  Reporter:  larryv  |      Owner:  larryv
      Type:  defect  |     Status:  new
  Priority:  Low     |  Milestone:
 Component:  base    |    Version:  2.2.0
Resolution:          |   Keywords:
      Port:          |
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Comment (by JDLH):

 This problem just affected me. In my case, MacPorts Base and all ports
 appeared to be fine. My current working directory was a subdirectory of
 `~/Desktop/`, and for some reason I can no longer list the contents of
 `~/Desktop/` with `ls`. This apparently was enough to make `pwd` unusable
 by MacPorts Base. The symptoms of this ticket followed. I fixed it by
 changing my current working directory to `~`.

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Ticket URL: <https://trac.macports.org/ticket/40035#comment:8>
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