Re: [PATCH v4] templates: introduce GRUB_TOP_LEVEL_* vars

Olaf Hering <[email protected]> Tue, 18 Oct 2022 16:18:21 +0200

Newsgroups	gmane.comp.emulators.xen.devel,gmane.comp.boot-loaders.grub.devel,gmane.linux.debian.ports.bsd
Message-ID	<[email protected]>

Tue, 18 Oct 2022 06:57:36 -0700 Denton Liu <[email protected]>:

> If I'm understanding correctly, what you're proposing is a mechanism for
> setting the default entry. If I'm not mistaken, this seems like an
> orthogonal discussion to me. My patch proposes a method of setting the
> top-level menu entry while this method only sets the default entry,
> which may be hidden behind a submenu.

I think this can be done already today. At least YaST offers a way to select a specific item in a submenu and pass it to grub-set-default. This leads to an entry like this in grubenv:

saved_entry=Advanced options for SLE15SP4 (with Xen hypervisor)>Xen hypervisor, version 4.17.20220823T122205.399bcbf2-xen_unstable.150400.370>SLE15SP4, with Xen 4.17.20220823T122205.399bcbf2-xen_unstable.150400.370 and Linux 5.14.21-150400.24.21-default

This entry will be booted as long as both this specific Xen version and this specific kernel version is found. There is a slim chance a SUSE specific patch exists to enable this functionality.

Maybe the patch description lacks a specific example how the proposed change is supposed to be used in your environment.

Olaf

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