gnuboot/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 usbserial_pl2303
insmod usbserial_ftdi
insmod usbserial_usbdebug
insmod regexp

# Serial and keyboard configuration, very important.
serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1
terminal_input --append  serial
terminal_output --append serial
terminal_input --append at_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}"/"${name}"grub.cfg
			fi
		done
	done
}
function search_grub {
	echo -n "Attempting to load grub.cfg from: "
	unset ddev
	if [ (${1}?) != "(${1}?)" ]; then
		ddev=(${1}*) # Both raw and partitioned devices
	fi
	for i in ${ddev}; do
		echo -n "${i} "
		try_user_config "${i}"
	done
	echo # Insert newline
}
function try_isolinux_config {
	set root="${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 {
	unset ddev
	if [ (${1}?) != "(${1}?)" ]; then
		ddev=(${1}*) # Both raw and partitioned devices.
		echo -n "Attempting to parse isolinux menu from: "
	fi
	for i in ${ddev}; do
		echo -n "${i} "
		try_isolinux_config "${i}"
	done
	echo # Insert newline
}
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
	unset lvmvol
	for vol in bootvol rootvol; do
		if [ (lvm\/?atrix-${vol}) != "(lvm/?atrix-${vol})" ]; then # Sketchy check, hardcoded string to be dropped in future
			lvmvol="${lvmvol} (lvm/matrix-${vol})"
		fi
	done
	unset raidvol
	if [ (md/?) != "(md/?)" ] ; then
		raidvol=(md/?)
	fi
	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!
#TODO: Unset variables before use!
#TODO: Pick better variable name scheme than ${ddev}, or find way to make it local
	unset ahcidev
	unset atadev
	if [ (ahci?) != "(ahci?)" ]; then
		ahcilist=(ahci*)
		for part in ${ahcilist}; do
				ahcidev="$part $ahcidev"
		done
	fi
	if [ (ata?) != "(ata?)" ]; then
		atalist=(ata*)
		for part in ${atalist}; do
				atadev="$part $atadev"
		done
	fi
	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

# Rescan lvm volumes, should probably use test at this point
	unset lvmvol
	for vol in bootvol rootvol; do
		if [ (lvm\/?atrix-${vol}) != "(lvm/?atrix-${vol})" ]; then # Sketchy check, hardcoded string to be dropped in future
			lvmvol="${lvmvol} (lvm/matrix-${vol})"
		fi
	done

#	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)/tianocore.elf ]; then
menuentry 'Load Tianocore UEFI payload' {
	set root='cbfsdisk'
	chainloader /tianocore.elf
}
fi