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Re: bin/51230: 'gpt biosboot' needs to mark protective mbr partition as 'active'
The following reply was made to PR bin/51230; it has been noted by GNATS.
From: Hauke Fath <hf%spg.tu-darmstadt.de@localhost>
Subject: Re: bin/51230: 'gpt biosboot' needs to mark protective mbr
partition as 'active'
Date: Fri, 10 Jun 2016 10:25:02 +0200
On Thu, 9 Jun 2016 19:40:01 +0000 (UTC), John Nemeth wrote:
> There is no such thing as an mbr backup.
Yes, I'd learned that in the meantime.
> The location of the
> GPT backup is specified in the UEFI spec and is thus non-negotiable.
> } Could gpt(8) maybe steer clear of the older brother's data when writi=
> } its backup?
> The issue has nothing to do with gpt(8). The problem is that
> fdisk(8) explicitly blows away both the primary and backup GPTs
> any time it writes to the disk, including when simply updating the
> "active" flag.
... which feels a bit radical, but I ca see there are situations where=20
you want this. Plus, the fdisk(8) man page is clear about it.
> gpt(8)'s "recover" command simply copies an existing
> GPT over a missing GPT. After fdisk(8) has written to the disk,
> there are no existing GPTs to be copied.
I noted, btw, that 'gpt restore' will restore the gpt from a backup,=20
but it will not restore the protecting mbr. Since that can lead to=20
nasty surprises later, it probably should.
The ASCII Ribbon Campaign Hauke Fath
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