Re: [gentoo-user] Painted into a corner: avahi and mDNSResponder

[Alan McKinnon]

On Sunday 12 October 2008 10:25:51 Andrey Vul wrote:
> On Sun, Oct 12, 2008 at 3:51 AM, Alan McKinnon <alan.mckinnon@×××××.com>
wrote:
> > On Sunday 12 October 2008 08:04:22 Volker Armin Hemmann wrote:
> >> On Sonntag 12 Oktober 2008, Alan E. Davis wrote:
> >> > Almost perpetually, the following packages or their versions are
> >> > blocking.  I have run emerge -e system several times.  Some other
> >> > problems were cleared up, and this
> >> > avahi--mDNSResponder/mdnsresponder-compat whatever it all is, just
> >> > keeps coming back even when solved by some skullduggery.  I've removed
> >> > both of them at one time or another.
> >> >
> >> > [blocks B     ] net-dns/avahi ("net-dns/avahi" is blocking
> >> > net-misc/mDNSResponder-107.6-r5)
> >> >
> >> > [blocks B     ] net-misc/mDNSResponder ("net-misc/mDNSResponder" is
> >> > blocking net-dns/avahi-0.6.23)
> >> >
> >> > I guess the problem is that I am running gnome and also have two or
> >> > three different versions/slots of kde installed.  I suppose, then,
> >> > it's remarkable that only these blocks are showing up?
> >> >
> >> > Can someone lend a hand on this?  Anything I do is little more than
> >> > blind tinkering.
> >> >
> >> > Alan
> >>
> >> set the avahi useflag, unmerge mdnsresponder, emerge avahi.
> >
> > That looks familiar. I remember similar deep blocks myself - it was nasty
> > at the time.
> >
> > For the OP's benefit, here's a high level summary of what is going on:
> >
> > Avahi and mDNSResponder implement a system called ZeroConf, first
> > designed by Apple. It's a way for machines on a network to find each
> > other and what network features they support. These systems are quite
> > low-level so unfortunately the implementations are often incompatible.
> >
> > By and large you will find that Gnome stuff supports Avahi and KDE stuff
> > supports mDNSResponder, so the only way out of this mess is often
> > extensive use of 'equery hasuse', 'equery depends' and 'emerge -pvt' so
> > see what pulls in what. But first you should research what these things
> > are so you can make intelligent decisions about what to include and what
> > to drop. The thing that cleared it up for me was an interview with the
> > KDE team lead responsible for these features - Google will find it for
> > you.
>
> IIRC mdnsresponder-compat USE flags allows use of avahi in KDE (3).

I believe you are correct:

alan@nazgul ~ $ grep mdns /var/portage/profiles/use.*
/var/portage/profiles/use.local.desc:net-dns/avahi:mdnsresponder-compat - 
Enable compat libraries for mDNSResponder




-- 
alan dot mckinnon at gmail dot com