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Quick fix for get_host_dns when resolv.conf points to resolved

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The Fedora infra workers got changed so their resolv.conf doesn't
have the correct DNS server addresses in it any more, it just
has 127.0.0.53 (the systemd-resolved resolver address). We need
to query resolved to get the correct addresses.

This is quick and hacky; it doesn't accommodate anyone running
a worker host that *isn't* using resolved, and it doesn't handle
IPv6 server addresses correctly if any are present (in infra we
currently don't use any on the worker hosts). I'll try and find
time to refine it but need to deploy this for now to make the
tests pass again.

Signed-off-by: Adam Williamson <awilliam@redhat.com>
This commit is contained in:
Adam Williamson 2022-05-18 18:05:26 -07:00
parent dac2a82fea
commit a5433c823d
1 changed files with 6 additions and 7 deletions
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13
lib/tapnet.pm
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@ -56,14 +56,13 @@ sub setup_tap_static {
}
sub get_host_dns {
# get DNS server addresses from the host
# get DNS server addresses from the host. Assumes host uses
# systemd-resolved and doesn't use IPv6, for now
my @forwards;
open(FH, '<', "/etc/resolv.conf");
while (<FH>) {
if ($_ =~ m/^nameserver +(.+)/) {
push @forwards, $1;
}
}
my $result = `/usr/bin/resolvectl status | grep Servers | tail -1 | cut -d: -f2-`;
# FIXME this is gonna break when we have IPv6 DNS servers on the
# worker hosts
my @forwards = split(' ', $result);
return @forwards;
}