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menuentry 'Load Operating System (incl. fully encrypted disks) [O]' --hotkey='o' --hotkey='O' {
# GRUB handles (almost) every possible disk setup, but only the location of /boot is actually important,
# since GRUB only loads the user's config. As soon as the kernel takes over, autoboot's done.
# 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 GRUB as payload and probably desired/used
# by most users, autoboot GRUB config tries to load the operating system (kernel) in the following way:
# 1. Try to decrypt raw devices first. This <your disk setup> inside a LUKS container is pretty common
# a) Try LVM and RAID first, they might be used (accross multiple (raw) devices)
# b) Always try LVM before RAID (LVM on (raw) RAID)
# c) Try MBR/GPT partitions at last, one might still conviniently uses a single partition
for d in (lvm/*) md/0 (md/0,*) ahci0 ahci1 (ahci0,*) (ahci1,*); do
# prompt user for passphrase if LUKS header is found
cryptomount ${d}
done
# (This way, we only need to scan for encrypted data once while covering every possible disk setup,
# be it LVM/BTRFS/ZFS/ext4/etc. (on LUKS) (on RAID) on/across raw devices/MBR/GPT
# 2. Look for user config. If the above routine successfully decrypted a LUKS container, its content
# will be searched before everything else for obvious reasons. Regardless of this, the devices'
# hirachy stays the same.
for d in crypto0 (crypt0,*) (lvm/*) md/0 (md0/,*) ahci0 ahci1 (ahci0,*) (ahci1,*); do
set root=${d}
# a) Check possible file locations...
for p in boot/grub/autoboot_ grub/autoboot_ boot/grub/ grub/; do
if [ -f "/${p}grub.cfg" ]; then
# b) And eventually try to load the config. Using ESC one can still exit and revert back to
# autoboot's menu.
configfile /${p}grub.cfg
fi
done
done
# 3. Last resort, if none of the above succeeds, all you have is GRUB's shell
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 ${p}initrd.img
fi
fi
done
}
menuentry 'Parse ISOLINUX menu (AHCI) [A]' --hotkey='a' --hotkey='A' {
for i in 0 1; do
# Check for filesystem on raw device without partition table (MBR/GPT), e.g. BTRFS or ZFS
set root=ahci${i}
for p in /isolinux /syslinux; do
if [ -f "${p}${p}.cfg" ]; then
syslinux_configfile -i ${p}${p}.cfg
elif [ -f "/boot${p}${p}.cfg" ]; then
syslinux_configfile -i /boot${p}${p}.cfg
fi
done
# Look for partitions
# GPT allows more than 4 partitions, /boot on /dev/sda7 is quite unlikely but still possible
for j in 0 1 2 3 4 5 6 7 8 9; do
set root="ahci${i},${j}"
for p in /isolinux /syslinux; do
if [ -f "${p}${p}.cfg" ]; then
syslinux_configfile -i ${p}${p}.cfg
elif [ -f "/boot${p}${p}.cfg" ]; then
syslinux_configfile -i /boot${p}${p}.cfg
fi
done
done
done
}
menuentry 'Parse ISOLINUX menu (USB) [U]' --hotkey='u' --hotkey='U' {
for i in 0 1; do
# Check for filesystem on raw device without partition table (MBR/GPT), e.g. BTRFS or ZFS
set root=usb${i}
for p in /isolinux /syslinux; do
if [ -f "${p}${p}.cfg" ]; then
syslinux_configfile -i ${p}${p}.cfg
elif [ -f "/boot${p}${p}.cfg" ]; then
syslinux_configfile -i /boot${p}${p}.cfg
fi
done
# Look for partitions
# GPT allows more than 4 partitions, /boot on /dev/sda7 is quite unlikely but still possible
for j in 0 1 2 3 4 5 6 7 8 9; do
set root=usb${i},${j}
for p in "/isolinux" "/syslinux"; do
if [ -f "${p}${p}.cfg" ]; then
syslinux_configfile -i ${p}${p}.cfg
elif [ -f "/boot${p}${p}.cfg" ]; then
syslinux_configfile -i /boot${p}${p}.cfg
fi
done
done
done
}
menuentry 'Parse ISOLINUX menu (CD/DVD) [D]' --hotkey='d' --hotkey='D' {
insmod ata
for x in ata0 ahci1; do
set root=${x}
for p in "/isolinux" "/syslinux"; do
if [ -f "${p}${p}.cfg" ]; then
syslinux_configfile -i ${p}${p}.cfg
elif [ -f "/boot${p}${p}.cfg" ]; then
syslinux_configfile -i /boot${p}${p}.cfg
fi
done
done
}
menuentry 'Switch to grubtest.cfg [T]' --hotkey='t' --hotkey='T' {
set root=cbfsdisk
configfile /grubtest.cfg
}
menuentry 'Search for GRUB configuration (grub.cfg) outside of CBFS [S]' --hotkey='s' --hotkey='S' {
for i in ahci0 ahci1 usb0 usb1; do
for j in 1 2 3 4 5 6 7 8 9; do
x=${i},${j}
for p in "grub" "boot/grub" "grub2" "boot/grub2"; do
if [ -f "${x}/${p}/grub.cfg" ]; then
submenu "Load Config from ${x}" ${x} {
root=$2
source /${p}/grub.cfg
unset superusers
}
fi
done
done
done
}
menuentry 'Poweroff [P]' --hotkey='p' --hotkey='P' {
halt
}
menuentry 'Reboot [R]' --hotkey='r' --hotkey='R' {
reboot
}
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