touch-packages team mailing list archive

[Thomas Hood <1394081@xxxxxxxxxxxxxxxxxx>]

The proper way for the admin to stop /etc/resolv.conf from being updated
by resolvconf is for him or her to remove the symbolic link
/etc/resolv.conf -> ../run/resolvconf/resolv.conf. The resolvconf
program only ever writes to the target of that symlink. Thus, in the
absence of that link, resolvconf has no effect on resolv.conf.

Yes, Ubuntu's dhclient-enter-hooks.d/resolvconf checks /etc/resolv.conf
and stomps on it if no symbolic link is there. That is different from
what the Debian version of the script does and is a departure from the
Debian convention. That has been complained about in bug #1385010.

Can you please describe more fully what you perceive to be the problem?
That's not clear to me yet.

In advance I will say that it is supposed to be the case that if the
admin has removed the symlink at /etc/resolv.conf then upgrading the
package does not restore the symlink.

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https://bugs.launchpad.net/bugs/1394081

Title:
  Add manual options for administrators

Status in “resolvconf” package in Ubuntu:
  New

Bug description:
  
  Currently - trusty LTS - there is no way to turn off the regeneration of /etc/resolv.conf that would survive a package upgrade. 

  - you cannot remove resolvconf as it is needed by minimal
  - you cannot disable-upgrades as this flag is removed by reboots
  - if you disable the resolvconf job in upstart package upgrade will reset the disable-upgrade flags
  - if you hack the scripts - it will only last until the next upgrade

  There are two ways to ensure that admins willing to turn it off can do
  so:

  First solution: add a run=no to /etc/default/resolvconf and bail out
  if it is set.

  The second solution is more subtile. In /etc/network/if-
  up.d/000resolvconf you will find this line:

  [ -x /sbin/resolvconf ] || exit 0

  While in /etc/dhcp/dhclient-enter-hooks.d/resolvconf it says

  if [ -x /sbin/resolvconf ] && [ -L /etc/resolv.conf ]; then

  Way more clever! So if you do not want to implement the default
  option, why not check if its a link all the way? So at least a conf
  gets not overwritten once the admin wrote his own.

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