Arch Linux

keving7

Member

Registered: 2016-10-02

Posts: 9

systemd-boot menu populater

Hey all,

Maybe im totally blind and somewhat reinvented the wheel here, but I couldn't find an automated way to fill up the entries for the loader.
Perhaps its little work to create the required files, but messing with different kernels such it can be somewhat annoying.
Its suppose to be somewhat like grub-mkconfig

#!/bin/bash

title="Archlinux"
commandline="splash quiet cryptdevice=UUID=c044cabb-e626-4ee2-a680-a9af6e9bc53a:cryptroot:allow-discards rd.luks.options=discard root=/dev/mapper/cryptroot rootflags=subvol=archlinux rd.udev.log-priority=3 elevator=bfq pcie_aspm=force zswap.enabled=1 net.ipv4.ip_forward=0 net.ipv4.conf.default.rp_filter=1 net.ipv4.conf.default.accept_source_route=0 acpi_osi=Linux panic=10"
intel_ucode="initrd	/intel-ucode.img"
default="vmlinuz-linux-ck"
timeout=5
function menu_entry {
	kernel=$1
	
	if [[ $kernel =~ ([^\ ]++)?/([^/]+) ]]; then
		kernel=${BASH_REMATCH[2]}	
		path=${BASH_REMATCH[1]}
	fi
	echo $kernel found

	initramfs=${kernel//vmlinuz/initramfs}.img
	echo - $initramfs
	if [[ ! -f "${path}/${initramfs}" ]]; then
		echo "- Initramfs not found for matching kernel"
		return -1
	fi

	if [[ -z $default ]]; then
		default=$kernel
	fi

	config=/boot/loader/entries/${kernel}.conf
	if [[ -f $config ]]; then
		rm $config
	fi
	
	touch $config
	echo "title	${title}" >> $config
	echo "linux	/${kernel}" >> $config
	echo "${intel_ucode}"	>> $config
	echo "initrd	/${initramfs}"	>> $config
	echo "options	${commandline}"	>> $config

	initramfs=${initramfs//.img/-fallback.img}
	echo - $initramfs
	if [[ ! -f "${path}/${initramfs}" ]]; then
		echo "- Initramfs not found for fallback"
		return -1
	fi
	config=/boot/loader/entries/${kernel}-fallback.conf
	if [[ -f $config ]]; then
		rm $config
	fi

	fallbackcommandline=${commandline//splash/}	
	fallbackcommandline=${fallbackcommandline//quiet/}	
	touch $config
	echo "title	${title}" >> $config
	echo "linux	/${kernel}" >> $config
	echo "${intel_ucode}"	>> $config
	echo "initrd	/${initramfs}"	>> $config
	echo "options	${fallbackcommandline}"	>> $config

}

if [[ ! -d /boot/loader ]]; then
	echo "Boot not mounted or systemd-boot not present"
	exit 1
fi

kernelfiles=$(find /boot -maxdepth 1 -type f)
for file in $kernelfiles; do
	if [[ ! $file =~ (\.img) ]]; then
		# echo $file
		menu_entry $file
	fi
done

loaderconf=/boot/loader/loader.conf

if [[ -f $loaderconf ]]; then
	rm $loaderconf
fi

touch $loaderconf
echo "timeout ${timeout}" >> $loaderconf
echo "default ${default}" >> $loaderconf

hylix

Member

Registered: 2010-05-06

Posts: 2

Re: systemd-boot menu populater

Hello,
Being back on arch with my pc I also worked a script o do this, i'll post it here, it seems relevant.

You need to edit it modify defaults then you can create preset files overriding the ones in the script.

linux-ck:

ENTRY_LABEL="Archlinux CK"
KERNEL_PATH="\EFI\arch\vmlinuz-linux-ck.efi"
INITRAMFS_PATH="\EFI\arch\initramfs-linux-ck.img"

usage:

setup_efiboot_mgr.sh <preset>

setup_efiboot_mgr.sh:

#!/bin/sh

PRESET=$1
echo "Selecting preset $1"

EBM="efibootmgr"

ROOT_DRIVE="/dev/sda"
ROOT_PART_NUM=2 # partition number, 1 if first
ROOT_UUID=""  #"UUID=f00-bar"
ROOT_FSTYPE="ext4"

ENTRY_LABEL="Arch Linux"
INTEL_MICROCODE="\EFI\arch\intel-ucode.img"
KERNEL_PATH="\EFI\arch\vmlinuz-linux.efi"
INITRAMFS_PATH="\EFI\arch\initramfs-linux.img"
KERNEL_ARGS="rw quiet splash"

source $PRESET
U_ARGS="root=${ROOT_UUID} rootfstype=${ROOT_FSTYPE} initrd=${INTEL_MICROCODE} initrd=${INITRAMFS_PATH} ${KERNEL_ARGS}"

EBM_ARGS="--create --gpt --disk $ROOT_DRIVE\
                --part          $ROOT_PART_NUM\
                --label         \"${ENTRY_LABEL}\"\
                --loader        ${KERNEL_PATH}\
                --unicode       \"${U_ARGS}\""

echo "Booting on:"
echo "    Drive: $ROOT_DRIVE"
echo "    UUID:  $ROOT_UUID"
echo "    Part:  $ROOT_PART_NUM"
echo "      FS:  $ROOT_FSTYPE"
echo ""
echo "Preset:"
echo "    Label: $ENTRY_LABEL"
echo "Microcode: $INTEL_MICROCODE"
echo "  Initram: $INITRAMFS_PATH"
echo "   Kernel: $KERNEL_PATH"
echo "     args: $KERNEL_ARGS"
echo ""
echo "Efibootmgr:"
echo "  Command: $EBM"
echo "     args: $EBM_ARGS"
echo ""

$EBM $EBM_ARGS

Just putting this here, still have a lot to do.
Also im lazy but I tought it could be useful for someone
Regards