Bug#692311: FTBFS if non-local network communication is forbidden

[Florian Schlichting]

On Sun, Nov 04, 2012 at 11:40:40PM +0100, gregor herrmann wrote:
> On Sun, 04 Nov 2012 22:40:36 +0100, Ansgar Burchardt wrote:
> 
> > libxml-stream-perl fails to build when I forbid non-local network
> > communication via iptables:
> > 
> >   iptables -A OUTPUT -m owner --uid-owner $username ! -o lo -j REJECT
> 
> > t/load.t ......... ok
> > Cannot resolve deep-thought: Resource temporarily unavailable at /«PKGBUILDDIR»/blib/lib/XML/Stream.pm line 409.
> 
> > ---
> > 
> > deep-thought is the hostname of the system I tried to build the package on.
> 
> ... and when the short hostname is not in /etc/hosts in the build
> chroot, as we discovered by various experiments while comparing
> results on IRC.

this is due to the following code in XML::Stream->new() lines 207ff:

    my $hostname = hostname();
    my $address = gethostbyname($hostname) ||
        die("Cannot resolve $hostname: $!");
    my $fullname = gethostbyaddr($address,AF_INET) || $hostname;

XML::Stream then uses this to identify in incoming and outgoing network
connections.

This looks reasonable to me, and should work on all buildd, no?

Florian