[Merge] lp:~timo-jyrinki/ubuntu/trusty/resolvconf/fix_lp_1308378 into lp:ubuntu/resolvconf

[Timo Jyrinki]

Timo Jyrinki has proposed merging lp:~timo-jyrinki/ubuntu/trusty/resolvconf/fix_lp_1308378 into lp:ubuntu/resolvconf.

Commit message:
debian/preinst: On 12.04 LTS the system works without /etc/resolv.conf.
Upon upgrading such a system to 14.04 LTS network stops working.
Therefore, create a symlink upon upgrade from resolvconf <= 1.64 in the
case that /etc/resolv.conf does not exist at all. (LP: #1308378)

Requested reviews:
  Ubuntu branches (ubuntu-branches)
Related bugs:
  Bug #1308378 in resolvconf (Ubuntu): "No working network after 12.04 LTS -> 14.04 LTS upgrade if no /etc/resolv.conf in precise"
  https://bugs.launchpad.net/ubuntu/+source/resolvconf/+bug/1308378

For more details, see:
https://code.launchpad.net/~timo-jyrinki/ubuntu/trusty/resolvconf/fix_lp_1308378/+merge/216300

The proposed branch adds upgrade) preinst rule for resolvconf < 1.64, and creates the symlink if and only if /etc/resolv.conf does not exist at all (normal file or symlink). I've tested that it does nothing when upgrading from newer resolvconf, and also leaves /etc/resolv.conf untouched if it exists as a normal file or a symlink, when upgrading from the precise version. It fixes the issue I saw on upgrade.
-- 
https://code.launchpad.net/~timo-jyrinki/ubuntu/trusty/resolvconf/fix_lp_1308378/+merge/216300
Your team Ubuntu branches is requested to review the proposed merge of lp:~timo-jyrinki/ubuntu/trusty/resolvconf/fix_lp_1308378 into lp:ubuntu/resolvconf.
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