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From: Test Rat <ttsestt@gmail.com>
To: Eduardo Morras <nec556@retena.com>
References: <20110813195127.GA34295@freebsd.org>
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	<35403.3654126853$1313318383@news.gmane.org>
Date: Sun, 14 Aug 2011 15:29:21 +0400
In-Reply-To: <35403.3654126853$1313318383@news.gmane.org> (Eduardo Morras's
	message of "Sun, 14 Aug 2011 12:27:21 +0200")
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Cc: freebsd-current@freebsd.org
Subject: Re: [rfc] replacing /boot/kernel.old with a unique directory name
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Eduardo Morras <nec556@retena.com> writes:

> At 22:06 13/08/2011, Steven Hartland wrote:
>>> i just had the following idea: how about instead of copying the
>>> current kernel
>>>to /boot/kernel.old and then installing the new one under /boot/kernel as the
>>> results of target installkernel, we create a unique directory name
>>> for the old
>>>kernel?
>>
>>The default size of / is likely your biggest problem.
>
> Don't know how much compresable is /boot/kernel.old but tar with -z 
> or -j may be a workaround. We can extract on demand and swap current
> /boot/kernel  with new /boot/kernel. Other way of do it is link
> /boot/kernel  to current kernel and update it, but i don't know
> (again) if it would work in single user mode.

There is kgzldr that lets you boot compressed kernels. Try

  $ gzip /boot/kernel/*
  $ reboot