I have one additional question. Sorry. According to the wiki I should use grub-mkconfig -o /boot/grub/grub.cfg to generate a new menu after removing or installing other kernels. But obviously /boot/grub/grub.cfg is wrong, at least for me (the subdir grub doesnt exist here). In my case the file is under /efi/grub/grub.cfg. Is that also OK? When mounting ESP I followed https://wiki.archlinux.org/title/EFI_system_partition#Mount_the_partition#Typical_mount_points and chose the 2nd variant.

Many thx. Worked fine.

If I install a new kernel, I have to recreate the entries with grub-mkconfig -o /boot/grub/grub.cfg. But do I have to do that also for kernel updates?

I don’t think so, because the filename should not change, if I’m right?

Ahh ok. Since in this case the script should only run at start and then exit, I use oneshot. Many thx.

Yep, I know. But when I only depend on

After=network-online.target
Wants=network-online.target

this doesn’t mean, I have a working internet connection. That’s why the loop.

Or is that wrong?

What’s the difference between oneshot and simple?

Nice. I will try the systemd unit. Meanwhile, i have added a loop in the script, which helps a little bit:

maxwait=15
if [[ $(nm-online -x) != *"online"* ]]; then
	echo "missing internet connection, waiting..."
	for (( i = 1; i <= maxwait; ++i )); do
		sleep 1 &
		echo $i
		if [[ $(nm-online -x) == *"online"* ]]; then
			break
		fi

		if [[ $i -eq $maxwait ]]; then
			echo "No internet connection"
			exit 1
		fi
		wait
	done 
fi

In my test, this exits the script after 15 seconds without connection, but continues, when the connection is available or is established within this time.

But i think, its a nice idea, to add this to the script AND use the systemd unit together.