Bug#1025062: systemd-resolved Provides: resolvconf, but is missing the isc-dhcp-client integration from resolvconf

[Michael Biebl]

Control: reassign -1 isc-dhcp-client

On Mon, 28 Nov 2022 10:24:55 +0100 Helmut Grohne <helmut at subdivi.de> wrote:
> Package: systemd-resolved,isc-dhcp-client
> 
> Hi,
> 
> When systemd-resolved started replacing and providing resolvconf, things
> looked good, but isc-dhcp-client no longer propagates DNS servers to
> resolved. This used to work when resolvconf and systemd-resolved were
> coinstallable and one used resolvectl to implement resolvconf. The crux
> is that resolvconf contains the integration scripts that make
> isc-dhcp-client run resolvconf even when resolvconf is provided by
> systemd-resolved. Now that systemd-resolved conflicts with resolvconf,
> it broke that integration, which is bad.
> 
> I briefly talked to Michael about this and he figured that we wouldn't
> want to go through the extra resolvconf layer and rather do things
> directly. Indeed, this is what has happened for ifupdown already.
> ifupdown now contains /etc/network/if-*.d/resolved and integrates
> directly. NetworkManager does it directly likewise. isc-dhcp-client
> should likely do it as well.
> 
> Thus I think a good solution to this bug would be:
>  * isc-dhcp-client ships scripts to directly integrate with resolved.
>  * systemd-resolved Breaks isc-dhcp-client in versions that don't
>    integrate.

It would be preferable if isc-dhcp-client ships the resolved integration 
bits.
The Debian package could steal from the Ubuntu package which appears to 
have some corresponding hooks:

# apt-file list isc-dhcp-client | grep resolved
isc-dhcp-client: /etc/dhcp/dhclient-enter-hooks.d/resolved-enter
isc-dhcp-client: /etc/dhcp/dhclient-exit-hooks.d/resolved

[Note: I did not have a look at those hook scripts at all]

I don't think we need a Breaks here.

With that said, I'm going to reassign this bug to isc-dhcp-client.

Regards,
Michael

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