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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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How to automatically assign classes in GRUB? (kbin.social)

submitted 11 months ago* (last edited 11 months ago) by [email protected] to c/[email protected]

14 comments fedilink hide all child comments

Hi, I'm not the most expert user, but I've been messing with my latest linux install for a few months. I costumized the look of the GRUB, but whenever the kernel gets updated and the grub.cfg gets regenerated, the classes of two entries do not generate (efi and submenu), leaving the entries with no icons (which are determined by the class of the entry).

How do I make it so they automatically generate, instead of me modifing the .cfg everytime the kernel is updated?

I'm on linux mint, 21.2 Cinnamon.

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[–] [email protected] 5 points 11 months ago (10 children)

Scripts that generate grub.cfg are located in /etc/grub.d/. You can edit them to specify classes. In my system (Debian) entries you ask about are added in /etc/grub.d/10_linux and /etc/grub.d/30_uefi-firmware.

[–] [email protected] 2 points 11 months ago* (last edited 11 months ago) (1 children)

should I just add the class parameter in these files where it is usually supposed to be, and the files even on updates will not be changed and this will work?

[–] [email protected] 4 points 11 months ago (2 children)

These files are not changed on updates. grub.cfg will be changed, but it will contain what these scripts write into it, so if you add classes to them, they will appear in new grub.cfg.

To test that everything works as expected, backup your current grub.cfg and run sudo update-grub.

[–] [email protected] 1 points 11 months ago

daje, grazie! (thanks!)

[–] [email protected] 1 points 11 months ago (1 children)

I'm not managing to get it to work on the submenu entry, only on the efi one. Don't know why

[–] [email protected] 1 points 11 months ago (1 children)

See if this entry generated by another script in this directory.

[–] [email protected] 1 points 10 months ago* (last edited 10 months ago) (1 children)

there were 2 scripts that semeed related to that: 10_linux_proxy and 35_linux_proxy.
There is a folder called proxified scripts, and inside it there are two files: linux and os-prober

Here is the text in the linux file: https://textdoc.co/V3atnuEvcG4QlPUp

I'm not sure what to do with it

[–] [email protected] 1 points 10 months ago (2 children)

You need to add class to this line:

echo "submenu '$(gettext_printf "Advanced options for %s" "${OS}" | grub_quote)' $menuentry_id_option 'gnulinux-advanced-$boot_device_id' {"

Insert ${CLASS} before $menuentry_id_option:

echo "submenu '$(gettext_printf "Advanced options for %s" "${OS}" | grub_quote)' ${CLASS} $menuentry_id_option 'gnulinux-advanced-$boot_device_id' {"

[–] [email protected] 1 points 10 months ago* (last edited 10 months ago)

it's not working, also I don't know why when I went in that line I have a \ now, that wasn't there before apparently, before $menuentry:

echo "submenu '$(gettext_printf "Advanced options for %s" "${OS}" | grub_quote)' \$menuentry_id_option 'gnulinux-advanced-$boot_device_id' {"

(I've tried adding it also in front of ${CLASS}, leaving it only were it is, and removing it from both)

[–] [email protected] 1 points 10 months ago* (last edited 10 months ago) (1 children)

What generates is this, so I think it's from the linux proxy 35:

### BEGIN /etc/grub.d/35_linux_proxy ###
submenu "Advanced Options"{
menuentry "Ubuntu, with Linux 5.15.0-91-generic" --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-91-generic-advanced-9e121508-86c8-407a-803d-9521d13f0be9' {
		recordfail
	savedefault
		load_video
		gfxmode $linux_gfx_mode
		insmod gzio
		if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
		insmod part_gpt
		insmod ext2
		search --no-floppy --fs-uuid --set=root 9e121508-86c8-407a-803d-9521d13f0be9
		echo	'Loading Linux 5.15.0-91-generic ...'
		linux	/boot/vmlinuz-5.15.0-91-generic root=UUID=9e121508-86c8-407a-803d-9521d13f0be9 ro  
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initrd.img-5.15.0-91-generic
}

...more entries here

[–] [email protected] 1 points 10 months ago* (last edited 10 months ago)

The linux proxy file has this inside it:

#!/bin/sh
#THIS IS A GRUB PROXY SCRIPT
'/etc/grub.d/proxifiedScripts/linux' | /etc/grub.d/bin/grubcfg_proxy "+'SUBMENU' as 'Advanced Options'{+'Advanced options for Ubuntu'/*, +'Advanced options for Ubuntu'/'Ubuntu, with Linux 5.15.0-75-generic'~28ff24c064536ab0cd3a1bad9f456e69~, +'Advanced options for Ubuntu'/'Ubuntu, with Linux 5.15.0-75-generic (recovery mode)'~712228d18fab4e59226cce8b4f0d3d91~, +'Advanced options for Ubuntu'/'Ubuntu, with Linux 5.15.0-73-generic'~f31b2a265d0dfef1fd439595ac77a493~, +'Advanced options for Ubuntu'/'Ubuntu, with Linux 5.15.0-73-generic (recovery mode)'~303762cfd1fb902e0cab98046932d096~, +'Advanced options for Ubuntu'/'Ubuntu, with Linux 5.15.0-72-generic'~b5308959171659a00cb9ad96851ff6a6~, +'Advanced options for Ubuntu'/'Ubuntu, with Linux 5.15.0-72-generic (recovery mode)'~30bf9c9d00d0afd9a6bbd4056b36d94e~, +'Advanced options for Ubuntu'/'Ubuntu, with Linux 5.15.0-56-generic'~a76a35ca20f2ed58db39dc7b60a1f7a6~, +'Advanced options for Ubuntu'/'Ubuntu, with Linux 5.15.0-56-generic (recovery mode)'~7e2e93487d695fdce68a6355544c0cee~}
-*
-#text
-'Ubuntu'~ff8d1852fd072e04e5a89b38002b354a~
"

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