I recently committed src/etc/postinstall, which performs various
post installation checks and can fix most problems found.

Usage: postinstall [-s srcdir] [-d destdir] operation [item [...]]
	Perform post-installation checks and/or fixes on a system's
	configuration files.  If no items are provided, all checks
	or fixes are applied.

	Options:
	-s srcdir	Source directory to compare from.  [/usr/src/etc]
	-d destdir	Destination directory to check.    [/etc]

	Operation may be one of:
		help	display this help
		list	list available items
		check	perform post-installation checks on items
		fix	apply fixes that 'check' determines need to be applied
		usage	display this usage

Supported items: 
  Item          Description
  ----          -----------
  defaults      /etc/defaults being up to date
  mtree         /etc/mtree being up to date
  rc            /etc/rc* and /etc/rc.d/ being up to date
  periodic      /etc/{daily,weekly,monthly,security} being up to date
  ssh           ssh configuration file relocation


"postinstall -d ${DESTDIR} check" is run after a "make install" to
ensure that various configuration settings are up to date in light
of software changes.


The postinstall script can be run after extracting a snapshot;
extract the etc.tgz set into a temporary directory and run
postinstall from that directory.  For example:
	cd /tmp
	tar zxf /some/snapshot/etc.tgz
	./etc/postinstall -s ./etc check
	    [ review checks, and if happy to perform the fixes ... ]
	./etc/postinstall -s ./etc fix

Luke.

-- 
Luke Mewburn  <lukem@wasabisystems.com>  http://www.wasabisystems.com
Luke Mewburn     <lukem@netbsd.org>      http://www.netbsd.org
Wasabi Systems - NetBSD hackers for hire
NetBSD - the world's most portable UNIX-like operating system