#!/bin/sh
#-
# Copyright (c) 2018 Rebecca Cran
# Copyright (c) 2017 Nathan Whitehorn
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$

BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1

: ${TMPDIR:="/tmp"}

die() {
	echo $*
	exit 1
}

if [ `uname -m` == powerpc ]; then
	platform=`sysctl -n hw.platform`
	if [ "$platform" == ps3 -o "$platform" == powernv ]; then
		rootpart=$(awk '{ if($2 == "/") printf("%s:%s\n", $3, $1); }' $PATH_FSTAB)
		mkdir -p $BSDINSTALL_CHROOT/boot/etc/
		echo FreeBSD=\'/kernel/kernel kernelname=/boot/kernel/kernel vfs.root.mountfrom=${rootpart}\' > $BSDINSTALL_CHROOT/boot/etc/kboot.conf
	fi
fi

# Update the ESP (EFI System Partition) with the new bootloader
if [ "$(uname -m)" = "amd64" ] || [ "$(uname -m)" = "i386" ]; then
	X86_BOOTMETHOD=$(sysctl -n machdep.bootmethod)
fi

if [ "$(uname -m)" = "arm64" ] || [ "$X86_BOOTMETHOD" = "UEFI" ]; then
	UFSBOOT_ESPS=$(cat $TMPDIR/bsdinstall-esps 2>/dev/null)
	ZFSBOOT_DISKS=$(cat $TMPDIR/bsdinstall-zfsboot 2>/dev/null)
	num_esps=0

	if [ -n "$ZFSBOOT_DISKS" ]; then
		# We're in a ZFS install environment
		for disk in $ZFSBOOT_DISKS; do
			index=$(gpart show "$disk" | cut -w -f 4,5 | grep "efi" | cut -w -f 1)
			# Check that $index is an integer
			[ -n "$index" ] && [ "$index" -eq "$index" ] && [ "$index" -ge 0 ] 2> /dev/null
			if [ $? -ne 0 ]; then
				continue
			fi

			if [ -e "/dev/${disk}p${index}" ]; then
				ESPS="$ESPS ${disk}p${index}"
			elif [ -e "/dev/${disk}s${index}" ]; then
				ESPS="$ESPS ${disk}s${index}"
			else
				continue
			fi

			num_esps=$((num_esps + 1))
		done
	fi

	if [ -n "$UFSBOOT_ESPS" ]; then
		# We're in a UFS install environment
		for partition in $UFSBOOT_ESPS; do
			ESPS="$ESPS $partition"
			num_esps=$((num_esps + 1))
		done
	fi

	if [ -z "$ESPS" ]; then
		# The installer hasn't given us any ESPs to use.
		# Try and figure out which to use by looking for an
		# unformatted efi partition

		for geom in $(gpart status -sg | awk '{print $1}'); do
			hasfreebsd=$(gpart show "${geom}" | cut -w -f 4,5 | grep "freebsd")
			if [ -n "$hasfreebsd" ]; then
				index=$(gpart show "${geom}" | cut -w -f 4,5 | grep "efi" | cut -w -f 1)
				# Check that $index is a valid integer
				[ -n "$index" ] && [ "$index" -eq "$index" ] && [ "$index" -ge 0 ] 2> /dev/null 
				if [ $? -ne 0 ]; then
					continue
				fi

				mntpt=$(mktemp -d $TMPDIR/stand-test.XXXXXX)
				if [ -e "/dev/${geom}p${index}" ]; then
					dev=${geom}p${index}
				elif [ -e "/dev/${geom}s${index}" ]; then
					dev=/${geom}s${index}
				else
					continue
				fi

				# Try and mount it. If it fails, assume it's
				# unformatted and should be used.
				mount -t msdosfs -o ro "/dev/${dev}" "${mntpt}"
				if [ $? -ne 0 ]; then
					ESPS="$ESPS ${dev}"
					num_esps=$((num_esps + 1))
				else
					umount "${mntpt}"
				fi
				rmdir "${mntpt}"
			fi
		done
	fi

	case $(uname -m) in
	    arm64)	ARCHBOOTNAME=aa64 ;;
	    amd64)	ARCHBOOTNAME=x64 ;;
    #	    arm)	ARCHBOOTNAME=arm ;; # No other support for arm install
    #	    i386)	ARCHBOOTNAME=ia32 ;; # no support for this in i386 kernels, rare machines
	    *)		die "Unsupported arch $(uname -m) for UEFI install"
	esac
	BOOTNAME="/EFI/BOOT/BOOT${ARCHBOOTNAME}.EFI"

	for esp in $ESPS; do
		f_dprintf "Formatting /dev/${esp} as FAT32"
		newfs_msdos -F 32 -c 1 -L EFISYS "/dev/$esp" > /dev/null 2>&1
		if [ $? -ne 0 ]; then
			die "Failed to format ESP $esp as FAT32"
		fi

		mntpt=$(mktemp -d $TMPDIR/stand-test.XXXXXX)
		f_dprintf "Mounting ESP /dev/${esp}"
		mount -t msdosfs "/dev/${esp}" "${mntpt}"
		if [ $? -ne 0 ]; then
			die "Failed to mount ESP ${dev} on ${mntpt}"
		fi

		f_dprintf "Installing loader.efi onto ESP"
		mkdir -p "$mntpt/EFI/freebsd"
		cp "$BSDINSTALL_CHROOT/boot/loader.efi" "${mntpt}/EFI/freebsd/loader.efi"

		#
		# The following shouldn't be necessary. UEFI defines a way to
		# specifically select what to boot (which we do via
		# efibootmgr). However, virtual environments often times lack
		# support for the NV variables efibootmgr sets. In addition,
		# some UEFI implementations have features that interfere with
		# the setting of these variables. To combat that, we install the
		# default removable media boot file as a fallback if it doesn't
		# exist. We don't install it all the time since that can
		# interfere with other installations on the drive (like rEFInd).
		#
		if [ ! -f "${mntpt}/${BOOTNAME}" ]; then
			cp "$BSDINSTALL_CHROOT/boot/loader.efi" "${mntpt}/${BOOTNAME}"
		fi

		if [ "$num_esps" -gt 1 ]; then
			bootlabel="FreeBSD (${esp})"
		else
			bootlabel="FreeBSD"
		fi

		f_dprintf "Creating UEFI boot entry"
		efibootmgr --create --activate --label "$bootlabel" --loader "${mntpt}/EFI/freebsd/loader.efi" > /dev/null

		f_dprintf "Unmounting ESP"
		umount "${mntpt}"
		rmdir "${mntpt}"

		f_dprintf "Finished configuring /dev/${esp} as ESP"
	done
fi

# Add boot0cfg for MBR BIOS booting?