From owner-freebsd-hackers@FreeBSD.ORG  Mon Mar 28 19:33:23 2011
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From: Devin Teske <dteske@vicor.com>
To: Jason Helfman <jhelfman@e-e.com>
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Date: Mon, 28 Mar 2011 12:33:30 -0700
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Cc: hackers@freebsd.org, Maxim Khitrov <max@mxcrypt.com>,
	Doug Barton <dougb@freebsd.org>, dieterbsd@engineer.com,
	Garrett Cooper <gcooper@freebsd.org>
Subject: Re: Keeping /etc/localtime up-to-date
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On Mon, 2011-03-28 at 11:48 -0700, Jason Helfman wrote:

> On Mon, Mar 28, 2011 at 02:22:01PM -0400, Maxim Khitrov thus spake:
> >Same here, though I'd be happy to change this habit if mergemaster
> >handled the updates for me.
> >
> This would be a good solution for source updates, but how would this work
> for binary upgrades via freebsd-update, as mergemaster is not used for this
> operation.


How we solved this back in 2006 when Congress altered the times that
Daylight Saving is observed, we pushed out an internal package that:

( Before Installation )

1a. If /etc/localtime is a symbolic link, proceed to installation (no
update needed).
1b. If /etc/localtime is a binary file,...
2. Compare /etc/localtime against each locale in /usr/share/zoneinfo
3. If you find a match, "remember" which timezone matched

( After Installation )

4. If /etc/localtime was binary and matched some locale
in /usr/share/zoneinfo, copy updated zoneinfo to /etc/localtime
(overwriting the current file).
-- 
Devin


> 
> -jgh
>