Public bug reported:

The 'mv_conffile' function only works if the target file exists by the
postinst stage.

This means the function doesn't support those packages where the new
configuration file is optional and may not exist at postinst stage.

The case in point is 'iptables-persistent' where the new 'rules.v4' may
not exists after installation. Bug #967018

A simple guard in front of the 'mv' command would add support.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: dpkg 1.16.1.2ubuntu7
ProcVersionSignature: Ubuntu 3.2.0-23.36-virtual 3.2.14
Uname: Linux 3.2.0-23-virtual x86_64
ApportVersion: 2.0.1-0ubuntu5
Architecture: amd64
Date: Thu Apr 19 09:28:11 2012
SourcePackage: dpkg
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/985508

Title:
  dpkg-maintscript-helper 'mv_conffile' fails if target doesn't already
  exist

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