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Subject: Re: NanoBSD: how to add manual upgrade "approval" / auto roll-back?
From: Andrew Stevenson <andrew@ugh.net.au>
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Date: Mon, 16 Jul 2018 22:12:57 +0200
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> On 16. Jul 2018, at 18:01, Lev Serebryakov <lev@FreeBSD.org> wrote:
>=20
> 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=E2=80=99t 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=