[Freeipa-devel] [PATCH] ipv6 compatible way to check the hostname

[Simo Sorce]

This change checks the machine can resolve address using nsswitch host 
name resolution, this means we are also checking that /etc/hosts is not 
broken.

It uses IPv6 aware system functions, so this should make it also IPv6 
compatible.

It does not force to have a DNS set up correctly, but that's intentional 
as we might want to install DNS as part of the installation 
(--setup-bind) and checking DNS before installing it wouldn't really 
work :-)

It still do try to check the DNS but currently it just exists silently 
if DNS is not configured. I am not sure how to raise a warning without 
throwing an exception that would make the install script abort in this case.

It does error out if DNS is setup incorrectly.

Simo.
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