[MacPorts] #61315: Distfile fetch for python39 hangs on 10.5

[MacPorts]

#61315: Distfile fetch for python39 hangs on 10.5
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  Reporter:  fhgwright  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.6.3
Resolution:             |   Keywords:
      Port:  python39   |
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Comment (by fhgwright):

 But it tries the upstream source first, and if that hangs rather than
 failing, it never gets the chance to move on to try the mirror.

 There are actually at least two bugs here - the hang, and the lack of a
 timeout.

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Ticket URL: <https://trac.macports.org/ticket/61315#comment:2>
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