From 5dad7b53413384d1a93180dacbc51f3480bb3300 Mon Sep 17 00:00:00 2001
From: Klemens Nanni <contact@autoboot.org>
Date: Tue, 06 Oct 2015 18:25:48 -0400
Subject: Merge kl3's GRUB enhancements from autoboot

---
(limited to 'resources/grub/config')

diff --git a/resources/grub/config/menuentries/common.cfg b/resources/grub/config/menuentries/common.cfg
index ec2def3..1d6c813 100644
--- a/resources/grub/config/menuentries/common.cfg
+++ b/resources/grub/config/menuentries/common.cfg
@@ -1,143 +1,137 @@
-menuentry 'Load Operating System' {
-	insmod ahci
-	insmod part_msdos
-	insmod part_gpt
-	# Iterate through all possible disks and partitions
-	for i in 0 1; do
-		# Look for fully encrypted disks, prompt for passphrase if successful
-		cryptomount "(ahci${i})"
-		# Check for filesystems replacing MBR/GPT at all, e.g. BTRFS or ZFS
-		x="(crypto${i})"
-		set root=${x}
-		for p in "grub/libreboot_" "boot/grub/libreboot_" "grub/" "boot/grub/"; do
-			if [ -f "${x}/${p}grub.cfg" ] ; then
+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
+	devs="(lvm/*) md/0 (md/0,*) ahci0 ahci1 (ahci0,*) (ahci1,*)"
+	#	d) Check every unencrypted device/partition first to avoid unnecessary decryption if /boot is
+	#	   not encrypted
+	for d in ${devs}; do
+	# 2. Look for user config. If the above routine successfully decrypted a LUKS container, its content
+	#    will be searched before everything else for obvious reasons. Regardless of this, the devices'
+	#    hirachy stays the same.
+		set root=${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
-		for j in 0 1 2 3 4 5 6 7 8 9; do
-		# Check for normal MBR/GPT disks
-		# GPT allows more than 4 partitions, /boot on /dev/sda7 is highly unlikely but still possible
-			# /boot can still be encrypted
-			for k in "crypto" "ahci"; do
-				x="(${k}${i},${j})"
-				set root=${x}
-				for p in "grub/libreboot_" "boot/grub/libreboot_" "grub/" "boot/grub/"; do
-					if [ -f "${x}/${p}grub.cfg" ] ; then
-						configfile /${p}grub.cfg
-					fi
-				done
-			done
-		done
 	done
-
-	set root='md/0'
-	for p in "/" "/boot/"; do
-		if [ -f "${p}vmlinuz" ] ; then
-			linux ${p}vmlinuz root=/dev/md0 rw
-			if [ -f "${p}initrd.img" ] ; then
-				initrd ${p}initrd.img
+	#   (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
+	for d in ${devs}; do
+		# prompt user for passphrase if LUKS header is found
+		cryptomount ${d}
+	done
+	# 3. Do the same routine again, but for possibly decrypted data this time. There might be an LVM
+	#    inside the LUKS container, but check crypto0 first since lvm/* also covers already existing (and
+	#    therefore already scanned volumes as well)
+	for d in crypto0 (crypt0,*) (lvm/*); do
+		set root=${d}
+		for p in boot/grub/autoboot_ grub/autoboot_ boot/grub/ grub/; do
+			if [ -f "/${p}grub.cfg" ]; then
+				configfile /${p}grub.cfg
 			fi
-		fi
+		done
 	done
-
-	set root='ahci0,1'
-	for p in "/" "/boot/"; do
-		if [ -f "${p}vmlinuz" ] ; then
+	# 4. Last resort, if none of the above succeeds, all you have is GRUB's shell
+	set root=ahci0,1
+	for p in / /boot/; do
+		if [ -f "${p}vmlinuz" ]; then
 			linux ${p}vmlinuz root=/dev/sda1 rw
-			if [ -f "${p}initrd.img" ] ; then
+			if [ -f "${p}initrd.img" ]; then
 				initrd ${p}initrd.img
 			fi
 		fi
 	done
 }
-menuentry 'Parse ISOLINUX menu (SATA)' {
-	insmod ahci
-	insmod part_msdos
-	insmod part_gpt
+menuentry 'Parse ISOLINUX menu (AHCI)  [A]' --hotkey='a' --hotkey='A' {
 	for i in 0 1; do
-		# Check for filesystems replacing MBR/GPT at all, e.g. BTRFS or ZFS
-		set root="(ahci${i})"
-		for p in "/isolinux" "/syslinux"; do
-			if [ -f "${p}${p}.cfg" ] ; then
+		# 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
+			elif [ -f "/boot${p}${p}.cfg" ]; then
 				syslinux_configfile -i /boot${p}${p}.cfg
 			fi
 		done
-		# Check for normal MBR/GPT disks
-		# GPT allows more than 4 partitions, /boot on /dev/sda7 is highly unlikely but still possible
+		# 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
+			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
+				elif [ -f "/boot${p}${p}.cfg" ]; then
 					syslinux_configfile -i /boot${p}${p}.cfg
 				fi
 			done
 		done
 	done
 }
-menuentry 'Parse ISOLINUX menu (USB)' {
-	insmod usbms
-	insmod part_msdos
-	insmod part_gpt
+menuentry 'Parse ISOLINUX menu (USB)  [U]' --hotkey='u' --hotkey='U' {
 	for i in 0 1; do
-		# Check for filesystems replacing MBR/GPT at all, e.g. BTRFS or ZFS
-		set root="(usb${i})"
-		for p in "/isolinux" "/syslinux"; do
-			if [ -f "${p}${p}.cfg" ] ; then
+		# Check for filesystem on raw device without partition table (MBR/GPT), e.g. BTRFS or ZFS
+		set root=usb${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
+			elif [ -f "/boot${p}${p}.cfg" ]; then
 				syslinux_configfile -i /boot${p}${p}.cfg
 			fi
 		done
-		# Check for normal MBR/GPT disks
-		# GPT allows more than 4 partitions, /boot on /dev/sda7 is highly unlikely but still possible
+		# 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
+			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
+				elif [ -f "/boot${p}${p}.cfg" ]; then
 					syslinux_configfile -i /boot${p}${p}.cfg
 				fi
 			done
 		done
 	done
 }
-menuentry 'Parse ISOLINUX menu (CD/DVD)' {
-	insmod ahci
+menuentry 'Parse ISOLINUX menu (CD/DVD)  [D]' --hotkey='d' --hotkey='D' {
 	insmod ata
-	insmod iso9660
-	for x in (ata0) (ahci1); do
+	for x in ata0 ahci1; do
 		set root=${x}
-		for p in "/isolinux" "/syslinux"; do
-			if [ -f "${p}${p}.cfg" ] ; then
+		for p in /isolinux /syslinux; do
+			if [ -f "${p}${p}.cfg" ]; then
 				syslinux_configfile -i ${p}${p}.cfg
-			elif [ -f "/boot${p}${p}.cfg" ] ; then
+			elif [ -f "/boot${p}${p}.cfg" ]; then
 				syslinux_configfile -i /boot${p}${p}.cfg
 			fi
 		done
 	done
 }
-menuentry 'Switch to grubtest.cfg' {
-	set root='cbfsdisk'
-	configfile (cbfsdisk)/grubtest.cfg
+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' {
-	insmod ahci
-	insmod usbms
-	insmod part_msdos
-	insmod part_gpt
-	for i in ahci0 usb0 usb1; do
+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
+			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
+						source ${p}/grub.cfg
 						unset superusers
 					}
 				fi
@@ -145,9 +139,9 @@ menuentry 'Search for GRUB configuration (grub.cfg) outside of CBFS' {
 		done
 	done
 }
-menuentry 'Poweroff' {
-halt
+menuentry 'Poweroff  [P]' --hotkey='p' --hotkey='P' {
+	halt
 }
-menuentry 'Reboot' {
-reboot
+menuentry 'Reboot  [R]' --hotkey='r' --hotkey='R' {
+	reboot
 }
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