[DRE-maint] Bug#998097: Bug#998097: ruby-eventmachine FTBFS on IPV6-only buildds and accesses the internet during the build

[Antonio Terceiro]

On Sat, Oct 30, 2021 at 11:53:46AM +0300, Adrian Bunk wrote:
> Source: ruby-eventmachine
> Severity: serious
> Tags: ftbfs
> 
> FTBFS on IPV6-only buildds:
> 
> https://buildd.debian.org/status/fetch.php?pkg=ruby-eventmachine&arch=amd64&ver=1.3~pre20201020-b50c135-3&stamp=1633500476&raw=0
> https://buildd.debian.org/status/fetch.php?pkg=ruby-eventmachine&arch=i386&ver=1.3~pre20201020-b50c135-4%2Bb1&stamp=1635578996&raw=0
> 
> FTBFS due to attempted DNS:
> 
> https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ruby-eventmachine.html
> 
> ...
> ===============================================================================
> Failure: test_nameserver(TestResolver):
>   <nil> was expected to be kind_of?
>   <String> but was
>   <NilClass>.
> /build/1st/ruby-eventmachine-1.3~pre20201020-b50c135/tests/test_resolver.rb:19:in `test_nameserver'
>      16:   end
>      17: 
>      18:   def test_nameserver
>   => 19:     assert_kind_of(String, EM::DNS::Resolver.nameserver)
>      20:   end
>      21: 
>      22:   def test_nameservers
> ===============================================================================
> ...

The ipv6-only thing is already worked around in
1.3~pre20201020-b50c135-4 by skipping the tests in those setups.

Now, there is some type of weird issue with the test suite. It seems to
fail randomly on some circumstances, which I could not pinpoint yet.
e.g. I cannot reproduce the failures on a i386 chroot locally.
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