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Re: GRUB only offers a rescue shell

From: Pascal Hambourg
Subject: Re: GRUB only offers a rescue shell
Date: Fri, 14 Jul 2017 10:43:57 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

Le 14/07/2017 à 06:15, Jordan Uggla a écrit :
On Thu, Jul 13, 2017 at 1:20 PM, Pascal Hambourg <address@hidden> wrote:

Or one could force grub-install to include the part_msdos module in the core
image with the --modules=part_msdos option.

One could, and it would work, but basically only by chance due to how
cross disk installs are supported in grub. grub-install would still
see it as a cross disk install, and would still set it up as such.
Because cross disk installs use an embedded config that searches by
UUID, and that search happens to still search partitions even when
grub-install "knew" that $prefix was not to be found on a partition,

IMO it is a pity that GRUB does not also search by UUID even when the core image and $prefix are on the same disk. It would avoid boot failure when the partition containing $prefix is renumbered (logical partition numbers are not stable when you create or remove another logical partition).

$prefix would be configured properly but it's an ugly work around that
could break if grub's implementation changes. I am firmly of the
opinion that the --modules option should never be used, as it is
almost exclusively misused and it is easy to break things when using

I had to use --modules once on a regular setup because grub-install did not include some required module by itself.

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