[MacPorts] #34547: python27: Failed to locate 'xz' in path

[MacPorts]

#34547: python27: Failed to locate 'xz' in path
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  Reporter:  fgermano@…  |      Owner:  jwa@…
      Type:  defect      |     Status:  reopened
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.3
Resolution:              |   Keywords:
      Port:  python27    |
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Comment (by jmr@…):

 I’m pretty sure this is a simple TOCTOU error. We calculate dependencies
 differently based on whether an archive is available. If one is, we don’t
 need build-time dependencies because we won’t be building. If an archive
 is found to be available but then fails to download for whatever reason
 though (e.g. internet connection goes down briefly), we get in trouble. We
 fall back to building from source, but we’re potentially missing some of
 the required dependencies.

 The basic troubleshooting steps in wiki:FAQ#buildfails will fix the
 problem if you get into this state. I’ve also added a check in r138461 to
 make the installation fail early if we found an archive but then failed to
 download it.

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Ticket URL: <https://trac.macports.org/ticket/34547#comment:15>
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