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Subject: Re: GRUB writing to grubenv outside of kernel fs code
To: Chris Murphy <lists@colorremedies.com>,
        Andrei Borzenkov <arvidjaar@gmail.com>
Cc: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
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From: "Austin S. Hemmelgarn" <ahferroin7@gmail.com>
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Date: Tue, 18 Sep 2018 15:13:52 -0400
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On 2018-09-18 14:57, Chris Murphy wrote:
> On Tue, Sep 18, 2018 at 12:16 PM, Andrei Borzenkov <arvidjaar@gmail.com> wrote:
>> 18.09.2018 08:37, Chris Murphy пишет:
> 
>>> The patches aren't upstream yet? Will they be?
>>>
>>
>> I do not know. Personally I think much easier is to make grub location
>> independent of /boot, allowing grub be installed in separate partition.
>> This automatically covers all other cases (like MD, LVM etc).
> 
> The only case where I'm aware of this happens is Fedora on UEFI where
> they write grubenv and grub.cfg on the FAT ESP. I'm pretty sure
> upstream expects grubenv and grub.cfg at /boot/grub and I haven't ever
> seen it elsewhere (except Fedora on UEFI).
> 
> I'm not sure this is much easier. Yet another volume that would be
> persistently mounted? Where? A nested mount at /boot/grub? I'm not
> liking that at all. Even Windows and macOS have saner and simpler to
> understand booting methods than this.
On this front maybe, but Windows' boot sequence is insane in it's own 
way (fun fact, if you have the Windows 8/8.1/10 boot-loader set up to 
multi-boot and want it to boot to something other than the default, it 
has to essentially _reboot the machine_ to actually boot that 
alternative entry).