bug#48405: Test suite failures on IPv6 only machines

bug#48405: Test suite failures on IPv6 only machines

[Vagrant Cascadian]

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When building guix on Debian's buildd infrastructure, some of the test
suites fail when building on machines that only have IPv6:

  https://buildd.debian.org/status/logs.php?pkg=guix&arch=amd64

In this case, the machine "x86-conova-01" is the only one that
fails to build, and one of the main differences from other machines may
be that it is IPv6 only.

The specific build logs for the failures appear here:

  https://buildd.debian.org/status/fetch.php?pkg=guix&arch=amd64&ver=1.3.0-1&stamp=1620886911&raw=0
  https://buildd.debian.org/status/fetch.php?pkg=guix&arch=amd64&ver=1.2.0-1&stamp=1606172126&raw=0
  https://buildd.debian.org/status/fetch.php?pkg=guix&arch=amd64&ver=1.2.0%7Erc2-1&stamp=1605882853&raw=0

This may be related to use of AI_ADDRCONFIG with getaddrinfo:

  https://lists.debian.org/debian-devel/2020/07/msg00070.html

I haven't yet figured out how to reproduce an environment in which this
fails consistently; maybe reproducing it in a guix container would be
possible?


live well,
  vagrant

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