From owner-freebsd-hackers@FreeBSD.ORG  Thu Apr 22 11:18:06 2010
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Date: Thu, 22 Apr 2010 13:17:58 +0200
From: Ruben de Groot <mail25@bzerk.org>
To: Doug Barton <dougb@freebsd.org>
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Cc: freebsd-hackers@freebsd.org, "Aryeh M. Friedman" <aryeh.friedman@gmail.com>
Subject: Re: regenerating /var/db/pkg
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On Wed, Apr 21, 2010 at 10:43:37PM -0700, Doug Barton typed:
> On 4/20/2010 7:11 PM, Aryeh M. Friedman wrote:
> > I acciddentally rm'ed my /var/db/pkg and want to know is it possible to 
> > rgenerate it (I have portmaster and portupgrade installed)
> 
> Portmaster certainly can't do this, it uses the information from
> /var/db/pkg. I'm not sure if portupgrade can do it or not.
> 
> Your most likely course of success is to generate a list of ports that
> you know you're using ("root" and "leaf" ports in portmaster
> terminology), back up any config or other key files from /usr/local,
> then delete everything and reinstall.

This question (how to restore /var/db/pkg) comes up fairly regularly. How 
about adding a /etc/periodic/daily/220.backup-pkgdb script or something?

Just asking opinions, if people want this, I'll make a patch and
file a PR.

Ruben