> * dhclient hook: Only trigger if /etc/resolv.conf is a symlink.
> * Make resolvconf exit 0 when /etc/resolv.conf isn't a symlink
In the Debian version of resolvconf, interface-configurer hook scripts always
run /sbin/resolvconf if it's present, whether or not /etc/resolv.conf is a
symlink. That way resolvconf is always provided with all available
information. It's also important to keep in mind that resolvconf may have
"subscribers" other than libc. Thus even if the admin --- for whatever reason
--- has decided to put a static file at /etc/resolv.conf or to link
/etc/resolv.conf to some other target generated by some other tool,
/sbin/resolvconf still gets run and it, in turn, still calls its hook scripts
so that its subscribers (perhaps dnsmasq, perhaps...) are made aware that there
is new information.
Some time ago some Ubuntu developer added
[ -L /etc/resolv.conf ] || exit 1
to the beginning of Ubuntu /sbin/resolvconf so that Ubuntu resolvconf
does nothing if /etc/resolv.conf isn't a symlink, the consequence of the
nonzero exit code being that NetworkManager will fall back to another
way of updating /etc/resolv.conf. (That wasn't a clean solution from my
point of view, as author of resolvconf. The clean solution would have
been (1) not to change /sbin/resolvconf, but (2) to change
NetworkManager so that it both calls resolvconf and writes
/etc/resolv.conf if the latter isn't a symlink. But the Ubuntu broth has
enough other cooks.)
If /sbin/resolvconf exits with 0 when /etc/resolv.conf isn't a symlink then, in
that case, NetworkManager will no longer write /etc/resolv.conf. Is this what
was intended?
--
Thomas Hood
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https://bugs.launchpad.net/bugs/922677
Title:
resolvconf should only convert /etc/resolv.conf to a symlink at
initial installation time
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