[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3271: CircleCI image builders with pip older than 9 fail because of setuptools incompatiblity

[Tahoe-LAFS]

#3271: CircleCI image builders with pip older than 9 fail because of setuptools
incompatiblity
--------------------------------+---------------------------
 Reporter:  exarkun             |          Owner:
     Type:  defect              |         Status:  new
 Priority:  supercritical       |      Milestone:  undecided
Component:  dev-infrastructure  |        Version:  n/a
 Keywords:                      |  Launchpad Bug:
--------------------------------+---------------------------
 setuptools 45 has been released and only supports Python 3.5 and newer.
 It seems to come with a `python_requires` declaration announcing this.
 pip older than 9 fails to successfully interpret `python_requires`
 declarations, though, resulting in a Python 3-only setuptools being
 installed.  Then, everything is broken because setuptools is incompatible
 with the version of Python in use.

 See also https://github.com/pypa/setuptools/issues/1964

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3271>
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