[Nix-dev] contributions for nixos (please check first if everyone agrees, especially gw6c users)

[Mathijs Kwik]

Hi all,

patch 1 and 2 can be applied right away, they're safe.
patch 3, 4 and 5 might need some discussion.

I set out to replace gw6c with gogoclient because of stdenv-updates
breaking gw6c.
gw6c's module was a bit messy (strange password handling using
seccurekeys), so I simplified it a bit too.

I found that many networking services were checking if gw6c was
enabled, so they could have their upstart tasks depend on it. I wanted
to abstract this idea and allow other network-interface-providing
services to provide this as well.
So in patch 3 I introduce an empty upstart task to depend on. By
default, it triggers when "network-interfaces" triggers, but services
like openvpn, ppp, gw6c/gogoclient can add themselves, or users can
override custom settings in their config.nix.

patch 4 introduces the gogoclient module, which uses / depends on this
framework.

patch 5 updates all services that had an explicit dependency on gw6c
to use all-interfaces.


Please provide feedback on these patches or commit them to svn if they
have been agreed upon.
Thanks!

Mathijs
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