DHCP and /etc/resolv.conf

[Simon Fels]

On 17.01.2017 17:46, Joe Coates wrote:
> The 'network-manager' slot interface does not show up in my Ubuntu-core interface list.   I'm running 2.21 on a Virtualbox VM.

It's not a slot you can put on your snap or one which is provided by the
core snap. It's a slot which only the network-manager snap can own and
no other one and its not a one which allows arbitrary snaps to access
the resolvconf configuration. For that we still need a different
interface or add support for resolvconf access to the network-control
interface.

If you look at the code for the network-manager interface the
responsible part for resolveconf is at
https://github.com/snapcore/snapd/blob/master/interfaces/builtin/network_manager.go#L86
I guess it would be ok to get those bits added to the network-control
interface at
https://github.com/snapcore/snapd/blob/master/interfaces/builtin/network_control.go

If you want you can easily submit a PR to get those bits added there. A
short introduction into snapd hacking is available at
https://github.com/snapcore/snapd/blob/master/HACKING.md

regards,
Simon


> -----Original Message-----
> From: snapcraft-bounces at lists.snapcraft.io [mailto:snapcraft-bounces at lists.snapcraft.io] On Behalf Of Simon Fels
> Sent: Tuesday, January 17, 2017 11:05 AM
> To: snapcraft at lists.snapcraft.io
> Subject: Re: DHCP and /etc/resolv.conf
> 
> On 17.01.2017 14:18, Zygmunt Krynicki wrote:
>> Quick grep tells me that no interface currently relates to
>> "resolv.conf" file
> 
> Actually you shouldn't allow access to /etc/resolv.conf but to /run/resolvconf/ which the network-manager interface allows as the only one so far.
> 
> regards,
> Simon
> 
>> On Tue, Jan 17, 2017 at 12:01 AM, Joe Coates
>> <jcoates at extremenetworks.com> wrote:
>>> Is there a current slot interface which allows write access to /etc/resolv.conf?
>>>
>>> Thanks,
>>> Joe Coates
>>>
>>> ________________________________________
>>> From: snapcraft-bounces at lists.snapcraft.io
>>> <snapcraft-bounces at lists.snapcraft.io> on behalf of Mark Shuttleworth
>>> <mark at ubuntu.com>
>>> Sent: Monday, January 16, 2017 4:58:45 PM
>>> To: Snapcraft
>>> Subject: Re: DHCP and /etc/resolv.conf
>>>
>>> On 16/01/17 16:39, Joe Coates wrote:
>>>
>>> I'm snapping an app which includes a DHCP client replacement.   Ultimately it wants to update/replace /etc/resolv.conf.     My snap is connected to all the "network" interfaces available in my ubuntu-core, but none seem to allow write access to this file.  Shouldn't an interface like "network-control" allow write access to /etc/resolv.conf ?
>>>
>>> I think /etc/resolv.conf is generated from a number of sources, but yes, it should be possible to influence it.
>>>
>>> Mark
>>>
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