lbmk/resources/grub/config/grub.cfg

set prefix=(memdisk)/boot/grub

insmod at_keyboard
insmod usb_keyboard
insmod nativedisk
insmod ehci
insmod ohci
insmod uhci
insmod usb
insmod usbms
insmod regexp

# Serial and keyboard configuration, very important.
terminal_input --append at_keyboard
terminal_input --append usb_keyboard
terminal_output --append cbmemc

gfxpayload=keep
terminal_output --append gfxterm

if [ -f (cbfsdisk)/background.png ]; then
	insmod png
	background_image (cbfsdisk)/background.png
elif [ -f (cbfsdisk)/background.jpg ]; then
	insmod jpeg
	background_image (cbfsdisk)/background.jpg
fi

# Default to first option, automatically boot after 1 second
set default="0"
set timeout=10

# This is useful when using 'cat' on long files on GRUB terminal
set pager=1

keymap usqwerty
function try_user_config {
	set root="${1}"
	for dir in boot grub grub2 boot/grub boot/grub2; do
		for name in '' osboot_ autoboot_ libreboot_ coreboot_; do
			if [ -f /"${dir}"/"${name}"grub.cfg ]; then
				unset superusers
				configfile /"${dir}"/"${name}"grub.cfg
			fi
		done
	done
}
function search_grub {
	echo -n "Attempting to load grub.cfg from: "
	# TODO : Find a better way to detect how many disks
	#	   : are on the computer instead of hardcoding.
	# FIXME: Does this work on all boards?
	for i in 0 1 2 3 4 5 6 7 8 9 10 11; do
		# TODO : Find a better way to detect how many partitions
		#      : are on the disk instead of hardcoding.
		echo "\nTrying disk ${1}${i}"
		for part in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
			# MBR/GPT partitions
			echo "\nTrying partiton ${part}"
			try_user_config "(${1}${i},${part})"
		done
		# raw devices
		echo "\nTrying to boot to a raw disk ..."
		try_user_config "(${1}${i})"
		echo # Insert newline
	done
}

function try_isolinux_config {
	set root="${1}"
	for dir in '' /boot; do
		if [ -f "${dir}"/isolinux/isolinux.cfg ]; then
			syslinux_configfile -i "${dir}"/isolinux/isolinux.cfg
		elif [ -f "${dir}"/syslinux/syslinux.cfg ]; then
			syslinux_configfile -s "${dir}"/syslinux/syslinux.cfg
		fi
	done
}
function search_isolinux {
	for i in 0 1 2 3 4 5 6 7 8 9 10 11; do
		# TODO : Find a better way to detect how many partitions
		#      : are on the disk instead of hardcoding.
		echo "\nAttempting to parse isolinux menu from ${1}${i}"
		for part in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
			# MBR/GPT partitions
			echo "\nTrying partiton ${part}"
			try_isolinux_config "(${1}${i},${part})"
		done
		# raw devices
		echo "\nTrying raw usb device ..."
		try_isolinux_config "(${1}${i})"
		echo # Insert newline
	done

}
menuentry 'Load Operating System (incl. fully encrypted disks)  [o]' --hotkey='o' {
# GRUB2 handles (almost) every possible disk setup, but only the location of
# /boot is actually important since GRUB2 only loads the user's config.

# LVM, RAID, filesystems and encryption on both raw devices and partitions in
# all various combinations need to be supported. Since full disk encryption is
# possible with GRUB2 as payload and probably even used by most users, this
# configuration tries to load the operating system in the following way:

# 1. Look for user configuration on unencrypted devices first to avoid
# unnecessary decryption routines in the following order:

#	1) raw devices and MBR/GPT partitions
	search_grub ahci
	search_grub ata
#	2) LVM and RAID which might be used accross multiple devices
	lvmvol="lvm/matrix-bootvol lvm/matrix-rootvol"
	# TODO: add more entries to this string in the future, with common
	# volume group names per common distro configs. look at what all the
	# popular distros are doing when the user select automatic partitioning
	# in their distro's installer. this still won't cover all use cases,
	# but grub's enumeration of anything partition-related is very slow,
	# so for now we hardcode everything in grub.cfg

	# again, hardcoded. grub's enumeration is always very slow.
	# until that is optimized, we must hardcode everything in grub.cfg
	raidvol="md/0 md/1 md/2 md/3 md/4 md/5 md/6 md/7 md/8 md/9"

	# in practise, doing multiple redundant checks is perfectly fast and
	# ok, even if less technically correct
	# TODO: optimize grub itself, and use */? here for everything

	for vol in ${lvmvol} ${raidvol} ; do
		try_user_config "${vol}"
	done
# 2. In case no configuration could be found, try decrypting devices. Look
# on raw crypto devices as well as inside LVM volumes this time.

#	The user will be prompted for a passphrase if a LUKS header was found.
# Encrypted disks and partitions
#TODO: This needs to be adjusted on each device to exclude ODD
#TODO: Usually ATA is for odd if both exist!
	unset ahcidev
	unset atadev
	for i in 11 10 9 8 7 6 5 4 3 2 1 0; do
		for part in 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1; do
			ahcidev="(ahci${i},${part}) ${ahcidev}"
			atadev="(ata${i},${part}) ${atadev}"
		done
	done

	set pager=0
	echo -n "Attempting to cryptomount: "
	for dev in ${ahcidev} ${atadev} ${lvmvol} ${raidvol}; do
		echo -n "${dev} "
		if cryptomount "${dev}" ; then break ; fi
	done
	set pager=1
	echo # Insert newline

# Retry lvm volumes, because after cryptomount, they might now be exposed

#	3) LVM inside LUKS containers
	for vol in ${lvmvol}; do
		try_user_config "${vol}"
	done

#	4) encrypted devices/partitions
	search_grub crypto

# TODO: generalize last resorts
# Use first connected device? not just sata port 1

	# Last resort, if all else fails
	set root=ahci0,1
	for p in / /boot/; do
		if [ -f "${p}vmlinuz" ]; then
			linux ${p}vmlinuz root=/dev/sda1 rw
			if [ -f "${p}initrd.img" ]; then
				initrd ${p}initrd.img
			fi
		fi
	done

	# Last resort (for setups that use IDE instead of SATA)
	set root=ata0,1
	for p in / /boot/; do
		if [ -f "${p}vmlinuz" ]; then
			linux ${p}vmlinuz root=/dev/sda1 rw
			if [ -f "${p}initrd.img" ]; then
				initrd ${p}initrd.img
			fi
		fi
	done

	true # Prevent pager requiring to accept each line instead of whole screen
}

menuentry 'Search ISOLINUX menu (AHCI)  [a]' --hotkey='a' {
	search_isolinux ahci
}
menuentry 'Search ISOLINUX menu (USB)  [u]' --hotkey='u' {
	search_isolinux usb
}
menuentry 'Search ISOLINUX menu (CD/DVD)  [d]' --hotkey='d' {
	insmod ata
	unset ahcidev
	unset atadev
	if [ (ata?) != "(ata?)" ]; then
		atadev=(ata?) # Only full drives not partitions
	fi
	if [ (ahci?) != "(ahci?)" ]; then
		ahcidev=(ahci1) # TODO: hardcoded!!!
	fi
	echo -n "Attempting to parse isolinux menu from: "
	for dev in ${atadev} ${ahcidev}; do
		echo -n "${dev} "
		try_isolinux_config "${dev}"
	done
	echo # Insert newline
}
menuentry 'Load test configuration (grubtest.cfg) inside of CBFS  [t]' --hotkey='t' {
	set root='(cbfsdisk)'
	if [ -f /grubtest.cfg ]; then
		configfile /grubtest.cfg
	fi
}
menuentry 'Search for GRUB2 configuration on external media  [s]' --hotkey='s' {
	search_grub usb
}
if [ -f (cbfsdisk)/seabios.elf ]; then
menuentry 'Load SeaBIOS (payload) [b]' --hotkey='b' {
	set root='cbfsdisk'
	chainloader /seabios.elf
}
fi
if [ -f (cbfsdisk)/img/grub2 ]; then
menuentry 'Return to SeaBIOS [b]' --hotkey='b' {
	set root='cbfsdisk'
	chainloader /fallback/payload
}
fi
menuentry 'Poweroff  [p]' --hotkey='p' {
	halt
}
menuentry 'Reboot  [r]' --hotkey='r' {
	reboot
}
if [ -f (cbfsdisk)/img/memtest ]; then
menuentry 'Load MemTest86+  [m]' --hotkey='m' {
	set root='cbfsdisk'
	chainloader /img/memtest
}
fi