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Bug#836016: netcfg: Drop unnecessary loopback config in /etc/network/interfaces



Hi,

On 08/30/2016 10:17 AM, Martin Pitt wrote:
> Please drop it as this is unnecessary extra parsing work at boot. I
> attach an untested (only build-tested) initial patch. The main thing
> I'm not sure about is whether this actually needs to clear
> /etc/network/interfaces when NetworkManager is installed -- would
> anything write "real" interfaces to /e/n/i in this case?

it needs to, yes. Otherwise you end up with the interface being
unmanaged from n-m, despite the n-m snippet having been written. I
suppose what we could do is just empty it out. At least trying that out
was successful for me. I also tested the non n-m case and that was fine.

> In a more general vein, ifupdown creates an appropriate /e/n/i on
> package installation already. It would be nicer if netcfg would not
> completly overwrite this and instead just add files to
> /etc/network/interfaces.d/

Yeah, I suppose we could do that. Is there already a naming convention
here? Would /etc/network/interfaces.d/${interface}.conf work? (Note that
for n-m we use a generic untranslated "Wired connection 1" with no
adapter matching specified in the snippet.)

Similarly I guess we could pre-configure systemd-networkd in some way,
but right now there's no package to check for. (Which is how we
determine if network-manager configuration needs to be written out.)

Kind regards and thanks
Philipp Kern

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