[Bug 1031065] [NEW] /sbin/resolvconf -a depends on /run/resolvconf/interface but it may not exist

[Scott Moser]

Public bug reported:

In development of 'overlayroot' package, I was mounting / as rw in the initramfs.
This was causing a different order of execution of mounts, and as a result a different order of networking resolvconf and networking bringup.

It exposed a bug in resolvconf, which was being called on boot in this order:
==== Mon Jul 30 19:08:58 UTC 2012 /sbin/resolvconf -a lo.inet ====
==== Mon Jul 30 19:08:59 UTC 2012 /sbin/dhclient-script  ====
==== Mon Jul 30 19:08:59 UTC 2012 /sbin/resolvconf -a eth0.dhclient ====
==== Mon Jul 30 19:08:59 UTC 2012 /sbin/resolvconf -a eth0.inet ====
==== Mon Jul 30 19:08:59 UTC 2012 /sbin/resolvconf --enable-updates ====
==== Mon Jul 30 19:08:59 UTC 2012 /etc/resolvconf/update.d/libc -u ====

The normal order is for resolvconf --enable-updates to be called (from /etc/init/resolvconf.conf) before anything else. As a result, I was seeing errors like:
  resolvconf: Error: /run/resolvconf/interface either does not exist or is not a directory

This may be exposing a more grave issue, in that I believe the reason
for dhclient coming up before resolvconf.conf started was that it was
being run as a result of /etc/init/network-interface.conf. I don't
immediately see how that is guarnateed to have /run ounted at all.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: resolvconf 1.67ubuntu1
ProcVersionSignature: User Name 3.5.0-6.6-generic 3.5.0
Uname: Linux 3.5.0-6-generic x86_64
Architecture: amd64
Date: Mon Jul 30 20:07:04 2012
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: resolvconf
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: resolvconf (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug quantal

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https://bugs.launchpad.net/bugs/1031065

Title:
  /sbin/resolvconf -a depends on /run/resolvconf/interface but it may
  not exist

Status in “resolvconf” package in Ubuntu:
  New

Bug description:
  In development of 'overlayroot' package, I was mounting / as rw in the initramfs.
  This was causing a different order of execution of mounts, and as a result a different order of networking resolvconf and networking bringup.

  It exposed a bug in resolvconf, which was being called on boot in this order:
  ==== Mon Jul 30 19:08:58 UTC 2012 /sbin/resolvconf -a lo.inet ====
  ==== Mon Jul 30 19:08:59 UTC 2012 /sbin/dhclient-script  ====
  ==== Mon Jul 30 19:08:59 UTC 2012 /sbin/resolvconf -a eth0.dhclient ====
  ==== Mon Jul 30 19:08:59 UTC 2012 /sbin/resolvconf -a eth0.inet ====
  ==== Mon Jul 30 19:08:59 UTC 2012 /sbin/resolvconf --enable-updates ====
  ==== Mon Jul 30 19:08:59 UTC 2012 /etc/resolvconf/update.d/libc -u ====

  The normal order is for resolvconf --enable-updates to be called (from /etc/init/resolvconf.conf) before anything else. As a result, I was seeing errors like:
    resolvconf: Error: /run/resolvconf/interface either does not exist or is not a directory

  This may be exposing a more grave issue, in that I believe the reason
  for dhclient coming up before resolvconf.conf started was that it was
  being run as a result of /etc/init/network-interface.conf. I don't
  immediately see how that is guarnateed to have /run ounted at all.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: resolvconf 1.67ubuntu1
  ProcVersionSignature: User Name 3.5.0-6.6-generic 3.5.0
  Uname: Linux 3.5.0-6-generic x86_64
  Architecture: amd64
  Date: Mon Jul 30 20:07:04 2012
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: resolvconf
  UpgradeStatus: No upgrade log present (probably fresh install)

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