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Re: Grub question

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David Wright composed on 2022-04-21 12:28 (UTC-0500):

> On Thu 21 Apr 2022 at 05:30:31 (-0500), Richard Owlett wrote:

>> When creating a partition with Gparted the is a box titled "Label:".
>> I was referring to the content placed there.
 
> There are lots of partitioners, but only one set of useful names,
> those matched by * in /dev/disk/by-*. I let the Grub scripts play
> with the UUIDs, and switch over to LABELs when it's done.
 
>> > Grub itself, of course,
>> > supports their use, but not the scripts that generate grub.cfg.
 
>> IIRC several years ago I was told I could manually edit to display as
>> desired. It would be overwritten the next time update-grub was run.
 
> That's right. So you can change what Grub eventually does when booting
> at several levels:
 
> . Press E at the blue screen, and do what you like as it only lasts
>   one boot. But remember what it was you did, in case it works.
 
> . Edit grub.cfg, and take some care, but if you screw up, you can
>   boot from another entry, and grub-mkconfig will generate a fresh
>   copy.
 
> . Edit /etc/default/grub, and take more care as screw-ups are
>   more persistent.
 
> . Roll your own.
 
Roll your own includes using /boot/grub/custom.cfg composed and maintained
exclusively by the sysadmin. This file is never written by the installation
itself. It needs changing only when:

1-Distro is added or removed.
2-Admin wants Distro name in Grub menu to be changed.
3-An applicable volume LABEL is changed.

/boot/grub/custom.cfg is routinely incorporated by Grub into the tail of
/boot/grub/grub.cfg via /etc/grub.d/40_custom and/or 41_custom. If 40_custom and
41_custom are copied by the admin to 06_custom and 07_custom, then Grub
incorporates the content of /boot/grub/custom.cfg before the automatically
generated /boot/grub/grub.cfg entries, putting the custom entries conveniently at
the top of each boot menu.

My current custom.cfg is using 7 lines per menuitem, compared to a more typical
autogenerated entry of about 17 lines. Example:

menuentry "Debian 11 Bullseye on Partition 14" {
	load_video
	set gfxpayload=keep
	search --no-floppy --set=root --hint-baremetal=ahci0,gpt14 --label exampleLabel
	linux	/vmlinuz root=LABEL=exampleLabel noresume mitigations=auto consoleblank=0 
	initrd	/initrd.img
}

Note lack of kernel and initrd versioning. Symlinks to current and previous
kernels and initrds are automatically generated in / on Debian installations.
Thus there's no need for custom.cfg change when kernels are installed or
removed or initrds rebuilt.
-- 
Evolution as taught in public schools is, like religion,
	based on faith, not based on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

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Grub question Richard Owlett <rcowlett@cloud85.net> - 2022-04-20 21:50 +0200
  Re: Grub question "Andrew M.A. Cater" <amacater@einval.com> - 2022-04-20 22:20 +0200
    Re: Grub question David Wright <deblis@lionunicorn.co.uk> - 2022-04-21 00:50 +0200
      Re: Grub question Richard Owlett <rcowlett@cloud85.net> - 2022-04-21 12:50 +0200
        Re: Grub question Tixy <tixy@yxit.co.uk> - 2022-04-21 13:50 +0200
        Re: Grub question Brian <ad44@cityscape.co.uk> - 2022-04-21 17:20 +0200
        Re: Grub question David Wright <deblis@lionunicorn.co.uk> - 2022-04-21 19:30 +0200
          Re: Grub question Felix Miata <mrmazda@earthlink.net> - 2022-04-22 00:30 +0200

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