Bug#636871: provide a command-line switch to prefer IPv6 or IPv4
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
I started a rewrite of that in another local branch, but it's not
done yet.
--
Debian Developer - deb.li/jak | jak-linux.org - free software dev
| Ubuntu Core Developer |
When replying, only quote what is necessary, and write each reply
directly below the part(s) it pertains to ('inline'). Thank you.
Reply to: