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Re: Bug in grub-menulst2cfg

From: Norman Shulman
Subject: Re: Bug in grub-menulst2cfg
Date: Thu, 22 Sep 2016 15:32:06 -0400

On Thu, Sep 22, 2016 at 2:52 PM, Andrei Borzenkov <address@hidden> wrote:
22.09.2016 21:08, Norman Shulman пишет:
> You're right; this patch only works for a single fallback entry, which is
> better than nothing.

Not really. If grub is currently booted using fallback entry, command
should fail, not set the same entry again.

> If you think nothing is better, then eliminating the first if-statement
> leaves a patch that at least fixes the NUM case.

This will be wrong in case of "fallback" then.

Right, but it will boot the first entry, which may be better than a reboot loop, which is what the current translation will do.
> A working NUM case makes it possible to work around the inability to save
> fallback. The example in "4.3.2 Booting fallback systems" can be rewritten
> as
> title A
> ...
> savedefault 1
> title B
> ...
> savedefault 2
> which is functionally equivalent.
> I'll think about how to handle a fallback list, but it seems hard.
> On Wed, Sep 21, 2016 at 11:31 PM, Andrei Borzenkov <address@hidden>
> wrote:
>> 21.09.2016 23:23, Norman Shulman пишет:
>>> I don't see how to open a bug in Bug Tracker, so I'm sending it to the
>> list.
>>> Legacy savedefault saves the current entry as the default boot entry if
>> no
>>> argument is specified. The translation only saves the first word of a
>>> multiword title.
>>> In addition, savedefault NUM and savedefault fallback are not supported.
>>> The attached patch to the latest git source fixes this.
>> $fallback can be list of entries, while $saved_entry is expected to be
>> single menu entry. GRUB legacy documentation is unclear what "next
>> fallback" means here and what happens if you do several consecutive
>> "savedefault fallback" invocations, but it still explicitly says "next
>> fallback entry", not "list of fallback entries".

Norman Shulman
Sr. Developer/Architect
N-Dimension Solutions Inc.
9030 Leslie St, Unit 300
Richmond Hill, ON L4B 1G2

Tel: 905 707-8884 x 226
Fax: 905 707-0886

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