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function try_user_config {
set root="${1}"
for dir in boot grub grub2 boot/grub boot/grub2; do
for name in '' autoboot_ libreboot_ coreboot_; do
if [ -f /"${dir}"/"${name}"grub.cfg ]; then
configfile /"${dir}"/"${name}"grub.cfg
fi
done
done
}
function search_grub {
for i in 0 1; do
# raw devices
try_user_config "(${1}${i})"
for part in 1 2 3 4 5; do
# MBR/GPT partitions
try_user_config "(${1}${i},${part})"
done
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 "${dir}"/syslinux/syslinux.cfg
fi
done
}
function search_isolinux {
for i in 0 1; do
# raw devices
try_isolinux_config "(${1},${i})"
for part in 1 2 3 4 5; do
# MBR/GPT partitions
try_isolinux_config "(${1}${i},${part})"
done
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
# 2) LVM and RAID which might be used accross multiple devices
lvm="lvm/matrix-rootvol lvm/matrix-boot"
raid="md/0 md/1 md/2 md/3 md/3 md/4 md/5 md/6 md/7 md/8 md/9"
for vol in ${lvm} ${raid}; do
try_user_config "(${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.
for dev in ahci0 ahci1 ${lvm}; do
cryptomount "(${dev})"
done
# 3) encrypted devices/partitions
for i in 0 1; do
for part in 1 2 3 4 5; do
cryptomount "(ahci${i},${part})"
done
done
# 3) encrypted devices/partitions
search_grub crypto
# 4) LVM inside LUKS containers
for vol in ${lvm}; do
try_user_config "(${vol})"
done
# 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 ${p}initrd.img
fi
fi
}
menuentry 'Search ISOLINUX menu (AHCI) [a]' --hotkey='a' {
search_isolinux ahci
}
menuentry 'Search ISOLINUX menu (USB) [u]' --hotkey='u' {
search_isolinux usb
}
menuentry 'Search ISOLINUX menu (CD/DVD) [d]' --hotkey='d' {
insmod ata
for dev in ata0 ahci1; do
try_isolinux_config "(${dev})"
done
}
menuentry 'Load test configuration (grubtest.cfg) inside of CBFS [t]' --hotkey='t' {
set root='(cbfsdisk)'
configfile /grubtest.cfg
}
menuentry 'Search for GRUB2 configuration on external media [s]' --hotkey='s' {
search_grub usb
}
menuentry 'Poweroff [p]' --hotkey='p' {
halt
}
menuentry 'Reboot [r]' --hotkey='r' {
reboot
}
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