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Date: Wed, 18 Nov 2009 14:10:20 +0100
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Robert Watson <rwatson@FreeBSD.org>
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Cc: freebsd-current@freebsd.org, Aristedes Maniatis <ari@ish.com.au>
Subject: Re: request: LOADER_ZFS_SUPPORT
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Robert Watson wrote:
>
> On Tue, 17 Nov 2009, Miroslav Lachman wrote:

[...]

>> If we are talking about freebsd-update... It would be nice if
>> freebsd-update leave old kernel available in /boot/ as with source
>> upgrade (/boot/kernel.old) at least until second reboot (in case of
>> upgrade), because if new kernel failed to boot after first reboot,
>> then the machine become unbootable without some kind of LiveFS media.
>
> This change was made in August, and I agree it was a very good idea:
>
> r196392 | simon | 2009-08-19 21:47:31 +0100 (Wed, 19 Aug 2009) | 17 lines
>
> Add support for backing up the old kernel when installing a new kernel
> using freebsd-update. This applies to using freebsd-update in "upgrade
> mode" and normal freebsd-update on a security branch.
>
> The backup kernel will be written to /boot/kernel.old, if the directory
> does not exist, or the directory was created by freebsd-update in a
> previous backup. Otherwise freebsd-update will generate a new directory
> name for use by the backup. By default symbol files are not backed up
> to save diskspace and avoid filling up the root partition.
>
> This feature is fully configurable in the freebsd-update config file,
> but defaults to enabled.
>
> MFC after: 1 week (stable/7)
> Reviewed by: cperciva
> Approved by: re (kib)

Thank you for the clarification! I am glad it is committed.

note: I am looking in to 7-STABLE (one week old) and it seems it was not 
MFCed yet.

Miroslav Lachman