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Date:      Mon, 16 Jul 2018 22:12:57 +0200
From:      Andrew Stevenson <andrew@ugh.net.au>
To:        lev@FreeBSD.org
Cc:        freebsd-embedded@freebsd.org
Subject:   Re: NanoBSD: how to add manual upgrade "approval" / auto roll-back?
Message-ID:  <98E0A548-4CFE-4C12-B0F0-3358B1DF841F@ugh.net.au>
In-Reply-To: <a4e2a130-eb5f-7cfd-ff43-7897ea8ba75a@FreeBSD.org>
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> On 16. Jul 2018, at 18:01, Lev Serebryakov <lev@FreeBSD.org> wrote:
> 
> Is it possible to make some mechanism (in loader? I don't think
> mbr/boot0 can accommodate this) which switch back active slice if boot
> into new version was not successful (not all services started, or kernel
> hangs, or network is unavailable), so it will be possible to roll-back
> upgrade by simple power cycle, without console access? Very important



I haven’t done this but, assuming you are using gptboot, can you not set the bootonce flag after upgrade? Then if the system comes up you set bootme.

Andrew
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