On Sat, Feb 17, 2018 at 3:36 PM, Grant Edwards
<grant.b.edwa...@gmail.com> wrote:
>
> I'm trying to figure out how to configure grub 2.02 so that no menu is
> displayed and it will boot immediately to the default unless shift is
> held down during boot -- in which case it displays the menu and waits
> indefinitely for a choice to be made.
>
> This is a bare-bones grub2 installation without any of the
> auto-magical, config generator scripts. All I have is grub.cfg and an
> editor.
>
> I've found many web pages that say all you have to to is edit
> /etc/default/grub and set GRUB_TIMEOUT=0 and GRUB_HIDDEN_TIMEOUT=0 and
> Bob's your uncle. Of course that file gets mashed about by dozens of
> shell scripts comprising thousands of lines of code to product the
> real grub.cfg containing hundreds of lines of code.
>
> [Oh God, how I hate grub2.]
>
> AFAICT, you end up with
>
> set timeout=0
> set timeout_style=hidden
>
> But, that doesn't seem to work. Holding down the shift key during boot
> doesn't cause the menu to be displayed, and it always boots directly
> to the default no matter what you do.
>
> Any grub2 experts care to lend a clue?
I don't have a grub2-on-Gentoo install but the below is from a test Debian VM.
"90-grub" is the only executable file in "/etc/grub.d/" and pressing
"shift" displays the grub menu.
I've had problems with "shift" with grub1 and grub2 in the past and
I'd use "set timeout=1" and press "esc" in order to display the grub
menu if I were you.
root@sysd ~ # grub-install --version
grub-install (GRUB) 2.02-2
root@sysd ~ # cat /etc/grub.d/90-grub
#!/bin/sh
cat <<EOF
# menu
set default=0
set timeout=0
set timeout_style=hidden
# kernel
insmod gzio
# disk/partition
insmod part_msdos
# filesystem
insmod ext2
# /boot
search --no-floppy --fs-uuid --set=root 87e976c8-1411-4dab-9c63-d5c7eec9975f
# video
terminal_input console
terminal_output console
menuentry 'systemd' {
linux /boot/kernel root=UUID=87e976c8-1411-4dab-9c63-d5c7eec9975f ro
initrd /boot/ramfs
}
menuentry 'systemd (single)' {
linux /boot/kernel root=UUID=87e976c8-1411-4dab-9c63-d5c7eec9975f ro single
initrd /boot/ramfs
}
menuentry 'systemd (emergency)' {
linux /boot/kernel root=UUID=87e976c8-1411-4dab-9c63-d5c7eec9975f ro emergency
initrd /boot/ramfs
}
EOF
root@sysd ~ #
