[Bug 989585] Re: resolvconf failed to install/upgrade because /etc/resolv.conf immutable

[Stéphane Graber]

Tested here with two LXC containers, both of them running up to date oneiric amd64 with chattr +i /etc/resolv.conf.
I then updated the sources.list for s/oneiric/precise/, updated the list and installed resolvconf. First container didn't have -proposed, the second one did.

Log for the first one:
Preconfiguring packages ...
Selecting previously deselected package resolvconf.
(Reading database ... 11527 files and directories currently installed.)
Unpacking resolvconf (from .../resolvconf_1.63ubuntu11_all.deb) ...
Processing triggers for ureadahead ...
Setting up resolvconf (1.63ubuntu11) ...
resolvconf.postinst: Error: Cannot replace the current /etc/resolv.conf with a symbolic link because it is immutable. To correct this problem, gain root privileges in a terminal and run 'chattr -i /etc/resolv.conf' and then 'dpkg --configure resolvconf'. Aborting.
dpkg: error processing resolvconf (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 resolvconf
E: Sub-process /usr/bin/dpkg returned an error code (1)

Log for the second one:
Preconfiguring packages ...
Selecting previously deselected package resolvconf.
(Reading database ... 11527 files and directories currently installed.)
Unpacking resolvconf (from .../resolvconf_1.63ubuntu13_all.deb) ...
Processing triggers for ureadahead ...
Setting up resolvconf (1.63ubuntu13) ...
resolvconf start/running
Processing triggers for resolvconf ...

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https://bugs.launchpad.net/bugs/989585

Title:
  resolvconf failed to install/upgrade because /etc/resolv.conf
  immutable

Status in “resolvconf” package in Ubuntu:
  Fix Released
Status in “resolvconf” source package in Precise:
  Fix Committed
Status in “resolvconf” source package in Quantal:
  Fix Released

Bug description:
  [Impact] because Network Manager historically would overwrite users'
  local DNS resolver settings on the desktop, a fair number of users
  have marked this file immutable on the filesystem.  This causes an
  upgrade failure when going to 12.04, which makes resolvconf a non-
  optional part of the infrastructure for all users and requires
  /etc/resolv.conf to be replaced by a symlink.

  [Development Fix]
  resolvconf is arch: all and should be pocket-copied to quantal after SRU accept.

  [Test Case]
  1.  Install Ubuntu 11.10
  2.  run: sudo chattr +i /etc/resolv.conf
  3.  do a release upgrade to 12.04
  4.  verify that the upgrade fails with an error from the resolvconf package.
  5.  enable -proposed
  6.  attempt the release upgrade again
  7.  verify that the upgrade completes successfully, and that /etc/resolv.conf has been made a symlink.

  [Regression Potential]
  Since this overrides a filesystem bit that's been explicitly set by the admin, some users may be unhappy with this change.  But this is not a supported configuration, so this should not block the SRU.

  Failed to install during upgrade

  ProblemType: Package
  DistroRelease: Ubuntu 12.04
  Package: resolvconf 1.63ubuntu11
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  Uname: Linux 3.2.0-23-generic x86_64
  ApportVersion: 2.0.1-0ubuntu5
  AptOrdering:
   unity-scope-musicstores: Install
   resolvconf: Configure
   ubuntu-minimal: Configure
   unity-scope-musicstores: Configure
  Architecture: amd64
  Date: Fri Apr 27 11:23:12 2012
  DuplicateSignature:
   Setting up resolvconf (1.63ubuntu11) ...
   resolvconf.postinst: Error: Cannot replace the current /etc/resolv.conf with a symbolic link because it is immutable. To correct this problem, gain root privileges in a terminal and run 'chattr -i /etc/resolv.conf' and then 'dpkg --configure resolvconf'. Aborting.
   dpkg: error processing resolvconf (--configure):
    subprocess installed post-installation script returned error exit status 1
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  PackageArchitecture: all
  SourcePackage: resolvconf
  Title: package resolvconf 1.63ubuntu11 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: Upgraded to precise on 2012-04-27 (0 days ago)

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