No DNS Lookups possible in rescue system when resolvconf package is installed

[vaporup]

Hi,

we use ReaR with a bunch of Ubuntu Systems and it works great so far.
Many thanks for this great project and keep up the good work.

Usually we put an IP address in local.conf or site.conf
and then rear recover works just fine in the rescue system.

But lately I used the DNS Name instead of the IP address because the Backup target used DNS Round Robin.

While testing the recover, the backup source could not be mounted because the hostname was not resolvable.

I checked /etc/ for resolv.conf and it was there, but a cat on it failed complaining it could not find the file.

I also checked the code if resolv.conf gets copied over to the rescue system.

In /usr/share/rear/rescue/GNU/Linux/30_dns.sh the variable COPY_AS_IS actually does this

The problem is, that /etc/resolv.conf is a symlink to /run/resolvconf/resolv.conf and that file was not copied over.

/etc/resolv.conf -> ../run/resolvconf/resolv.conf

Cause is the resolvconf package which dynamically creates the resolv.conf in /run/resolvconf/resolv.conf and symlinks it to /etc.

http://packages.ubuntu.com/trusty/resolvconf
http://en.wikipedia.org/wiki/Resolvconf