On 3/27/25 12:37 AM, Felix Miata wrote:
Robert McBroom composed on 2025-03-27 00:02 (UTC-0400):
Felix Miata wrote:
Simplest: remove Grub from B, or disable Grub on B. Only one Grub per PC is
needed. After each new kernel is installed to B, update Grub on A with os-prober
enabled and with GRUB_DISABLE_SUBMENU="y" in /etc/default/grub. Even that frequent
Grub maintenance effort isn't needed if you configure your Grub to boot using
kernel and initrd symlinks instead of specific kernel and symlink versions.
I don't have any dual boot PCs. Mine are all multiboot, 10 or more GNU/Linux
installations per PC on most. Fewest has 4. 2 have more than 40 each.
Could you give an example?
Example of what exactly?
# grep menuentry /boot/grub2/custom.cfg | wc -l
31
# grep -A6 dora /boot/grub2/custom.cfg
menuentry "Fedora 42 defkernel on P22" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt22 --label <filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60
initrd /boot/initrd
}
--
menuentry "Fedora 41 defkernel 3 on P25" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt25 --label <filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3
initrd /boot/initrd
}
--
menuentry "Fedora 39 defkernel 3 on P15" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt15 --label <filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3
initrd /boot/initrd
}
--
menuentry "Fedora 40 defkernel 3 on P18" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt18 --label <filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3
initrd /boot/initrd
}
--
menuentry "Fedora 42 oldkernel 3 on P22" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt22 --label <filter>
linux /boot/vmlinuz-old root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3Re:
initrd /boot/initrd-old
}
--
menuentry "Fedora 42 test kernel 3 on P22" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt22 --label <filter>
linux /boot/vmlinuz-tst root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3
initrd /boot/initrd-tst
}
# fdisk -l /dev/nvme0n1 | grep nux | wc -l
26
# ls -gGh /disks/f39/boot/initrd-*
lrwxrwxrwx 1 36 Dec 30 17:22 /disks/f39/boot/initrd-cur -> initramfs-6.11.9-100.fc39.x86_64.img
lrwxrwxrwx 1 37 Oct 30 23:22 /disks/f39/boot/initrd-old -> initramfs-6.10.13-100.fc39.x86_64.img
lrwxrwxrwx 1 36 Aug 12 2024 /disks/f39/boot/initrd-old2 -> initramfs-6.9.12-100.fc39.x86_64.img
# ls -gGh /etc/grub.d/*cust*
menuentry "Fedora 40 defkernel 3 on P18" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt18 --label <filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3
initrd /boot/initrd
}
-rwxr-xr-x 1 216 Feb 11 2017 /etc/grub.d/07_custom
-rwxr-xr-x 1 0 Aug 9 2018 /etc/grub.d/40_custom
-rwxr-xr-x 1 0 Aug 9 2018 /etc/grub.d/41_custom
#
Because of 07_custom, which is merely a copy of the OEM/upstream 41_custom,
the Grub bootloader displays the stanzas from custom.cfg first in the bootmenuentry "Fedora 40 defkernel 3 on P18" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt18 --label <filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3
initrd /boot/initrd
}
--
menuentry "Fedora 40 defkernel 3 on P18" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt18 --label <filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3
initrd /boot/initrd
}
menu presented, followed by those from auto-generated entries in grub.cfg.
40_custom or a copy of it renamed could be used as initial template instead,
to contain the custom stanzas instead of using a custom.cfg file (AIUI).
see also:
<https://forums.opensuse.org/t/how-to-have-a-custom-uefi-grub-menu-for-a-multiboot-system/133541>
There is much hidden. Symlinks don't track to the changes that an update
does to /boot
menuentry "Fedora 40 defkernel 3 on P18" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt18 --label <filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0 ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off video=1440x900@60 3
initrd /boot/initrd
}
--
What activity goes on in <filter>? Something picks up the names on the new kernel in an update.
You are naming the partitions by labels in your own scheme which can be understood and mapped to your custom.cfg.
Something then has to pick up the /boot/initramfs... of a new upgrade and cycle it into the rotation in the storage space of
/disks/f39/boot/...
Can see how all can be done with extensive editing but not easily.
--
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