Bug#636871: provide a command-line switch to prefer IPv6 or IPv4
Control: forcemerge -1 668948
On Sat, Oct 07, 2017 at 11:28:57PM +0200, Julian Andres Klode wrote:
> On Sun, Nov 20, 2016 at 01:12:48PM +0100, David Kalnischkies wrote:
> > Control: severity -1 wishlist
> > Control: tags -1 newcomer
> > Control: retitle -1 apt: implement "Happy Eyeballs" for methods and IPv4/6
> > Control: forcemerge -1 845041
> >
> > On Sun, Nov 20, 2016 at 10:23:25AM +0000, Tim Small wrote:
> > > There are already system-wide mechanisms to change the default stack
> > > which is used (/etc/gai.conf), and apt has:
> > >
> > > -o Acquire::ForceIPv4
> >
> > Indeed, the option exists already (but it is -o Acquire::ForceIPv4=1 ).
> >
> > I don't think we should be "wasting" single-char options on a workaround
> > for a problem which (hopefully) is on rapid decline, so I consider that
> > part of the request(s) done, but:
> >
> >
> > > What might be better (and would be a useful addition) would be to add
> > > fast fallback ("Happy Eyeballs" RFC6555) support to apt, especially when
> > > run in interactive mode. I'm not familiar with the code, but I believe
> >
> > > that libcurl includes RFC6555 support, and since apt uses libcurl, it
> > > might be easy to turn this on (or it might not).
> >
> > apt is using libcurl(-gnutls) only for HTTPS¹. We have our own
> > implementation for HTTP (and FTP and stuff) in methods/connect.cc.
> > An implementation would likely need to reshuffle the code there a bit as
> > it is split over multiple functions – but they are static with a central
> > entry point given the initial hostname (on which SRV lookup is performed
> > and stuff) and returning the open socket-fd [simplified, there are
> > various other things passed in and given back, but that is the idea],
> > so that should absolutely be doable if someone wants to work on
> > implementing it.
> >
> > If someone wants to try feel free to contact us on deity@/#debian-apt!
>
> JFTR: I wrote an implementation of parts of happy eyeballs for another
> bug we should probably merge in here, but it fails the test suite on
> CI: https://github.com/julian-klode/apt/commits/bugfix/happy-eyeballs
Merging the other bug into this one.
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