[gentoo-dev] [RFC] /etc/resolv.conf symlink through net-dns/resolvconf-symlink

[Michał Górny]

Hello,

Many modern systems have their /etc/resolv.conf files autogenerated at
runtime with DHCP, PPP or so on. Thus, storing that file in /etc seems
no longer correct as that directory may be mounted read-only.

I'm attaching a net-dns/resolvconf-symlink ebuild which
replaces /etc/resolv.conf with a symlink to a runtime-writable location
when installed. That package could be added to PDEPEND of packages like
net-misc/networkmanager or net-dns/openresolv.

Right now, that location is /var/run/resolv.conf. Using /run seems
better for it but that directory is not yet in our baselayout.

The package has USE=symlink which could be disabled by users which want
to keep /etc/resolv.conf as-is.

Right now, pkg_preinst() ensures that /etc/resolv.conf is autogenerated
(tested with resolvconf and networkmanager) or doesn't exist and refuses
to install otherwise. In future, this will be expanded to support more
cases if necessary.

In addition to that, pkg_preinst() and pkg_postrm() handle moving
resolv.conf there and back to avoid leaving user with no nameservers.

I also covered a similar idea in bug #377595 [1].

[1]:https://bugs.gentoo.org/show_bug.cgi?id=377595

-- 
Best regards,
Michał Górny