From 5fa778d7b36ab0981ff9dcbd96c71ebf653a6a19 Mon Sep 17 00:00:00 2001
From: Sascha Wildner <saw@online.de>
Date: Sun, 15 Jan 2017 20:29:03 +0100
Subject: [PATCH] nrelease: Add UEFI mode capable boot media.

Add an EFI system partition to the IMG (to boot on UEFI systems) but
keep MBR (to boot on legacy BIOS systems).

The approach in https://wiki.freebsd.org/UEFI#CD.2FDVD_Boot_under_UEFI
is used to make the ISO boot on both UEFI and legacy systems.
---
 nrelease/Makefile | 53 ++++++++++++++++++++++++++++++++++-------------
 1 file changed, 39 insertions(+), 14 deletions(-)

diff --git a/nrelease/Makefile b/nrelease/Makefile
index 44cb22d5dc..0566c7dac4 100644
--- a/nrelease/Makefile
+++ b/nrelease/Makefile
@@ -141,7 +141,6 @@ quick:		quickrel
 
 realquick:	realquickrel
 
-
 #########################################################################
 #			   CORE SUPPORT TARGETS 			#
 #########################################################################
@@ -325,9 +324,22 @@ customizeiso:
 	cpdup ${ISOROOT}/etc/group ${ISOROOT}/etc.hdd/group
 
 mkiso:
-	( cd ${ISOROOT}; mkisofs -b boot/cdboot -no-emul-boot \
-		-R -J -o ${ISOFILE} \
+	if [ ! -d ${IMGMNT} ]; then mkdir -p ${IMGMNT}; fi
+	-if [ -f ${ISODIR}/vn.which ]; then umount ${IMGMNT}; 		\
+	    vnconfig -u `cat ${ISODIR}/vn.which`; fi
+	newfs_msdos -C 400k -F 12 -L EFI -m 0xf8 ${ISOROOT}/boot/efiboot.img
+	vnconfig -l | grep "not in use" | head -n 1 | 			\
+	    cut -f 1 -d: > ${ISODIR}/vn.which
+	vnconfig -e -s labels `cat ${ISODIR}/vn.which` ${ISOROOT}/boot/efiboot.img
+	mount_msdos /dev/`cat ${ISODIR}/vn.which` ${IMGMNT}
+	mkdir -p ${IMGMNT}/EFI/BOOT
+	cp ${ISOROOT}/boot/loader.efi ${IMGMNT}/EFI/BOOT/BOOTX64.EFI
+	umount ${IMGMNT}
+	( cd ${ISOROOT}; mkisofs -R -J -o ${ISOFILE} \
+		-b boot/cdboot -no-emul-boot \
+		-eltorito-alt-boot -eltorito-platform efi -eltorito-boot boot/efiboot.img -no-emul-boot \
 		-V "DragonFly `${.CURDIR}/../tools/gitrev.sh | cut -c -22`" . )
+	rm -f ${ISOROOT}/boot/efiboot.img
 
 mkimg:
 	if [ ! -d ${IMGMNT} ]; then mkdir -p ${IMGMNT}; fi
@@ -347,29 +359,42 @@ mkimg:
 	    rm -f ${IMGFILE};						\
 	    truncate -s $${sz}M ${IMGFILE};
 .endif
-	fdisk -IB -p ${IMGFILE}
 	@echo "STEP: determine free vn device"
 	vnconfig -l | grep "not in use" | head -n 1 | 			\
 	    cut -f 1 -d: > ${ISODIR}/vn.which
 	vnconfig -e -s labels `cat ${ISODIR}/vn.which` ${IMGFILE}
+	@echo "STEP: set up legacy MBR"
+	fdisk -IB `cat ${ISODIR}/vn.which`
+	fdisk -s `cat ${ISODIR}/vn.which` >${ISODIR}/fdisk.dat
+	awk '(NR==1){printf("g c%s h%s s%s\n", $$2, $$4, $$6);}' \
+	    ${ISODIR}/fdisk.dat >${ISODIR}/fdisk.conf
+	echo "p 1 239 63 257985" >>${ISODIR}/fdisk.conf
+	awk '($$1=="1:"){printf("p 2 165 258048 %lu\n", $$3 - 258528);}' \
+	    ${ISODIR}/fdisk.dat >>${ISODIR}/fdisk.conf
+	echo "a 2" >>${ISODIR}/fdisk.conf
+	fdisk -iv -f ${ISODIR}/fdisk.conf `cat ${ISODIR}/vn.which`
+	rm ${ISODIR}/fdisk.conf ${ISODIR}/fdisk.dat
+	newfs_msdos -F 32 -c 2 -L EFI -m 0xf8 `cat ${ISODIR}/vn.which`s1
+	mount_msdos /dev/`cat ${ISODIR}/vn.which`s1 ${IMGMNT}
+	mkdir -p ${IMGMNT}/EFI/BOOT
+	cp ${ISOROOT}/boot/boot1.efi ${IMGMNT}/EFI/BOOT/BOOTX64.EFI
+	umount ${IMGMNT}
 	@echo "STEP: write standard disklabel"
-	disklabel -w -r `cat ${ISODIR}/vn.which`s1 auto
+	disklabel -w -r `cat ${ISODIR}/vn.which`s2 auto
 	@echo "STEP: read disklabel back"
-	disklabel -r `cat ${ISODIR}/vn.which`s1 > ${IMGFILE}.label
+	disklabel -r `cat ${ISODIR}/vn.which`s2 > ${IMGFILE}.label
 	@echo "STEP: determine number of sectors of whole disk"
 	secs=`tail -n 1 ${IMGFILE}.label | cut -f 3 -w`;		\
 	    echo "  a:  $${secs} 0 4.2BSD" >> ${IMGFILE}.label;
 	@echo "STEP: write modified disklabel back"
-	disklabel -R -r `cat ${ISODIR}/vn.which`s1 ${IMGFILE}.label
+	disklabel -R -r `cat ${ISODIR}/vn.which`s2 ${IMGFILE}.label
 	rm ${IMGFILE}.label
-	@echo "STEP: write bootsector"
-	disklabel -B `cat ${ISODIR}/vn.which`s1
-	boot0cfg -B -o noupdate `cat ${ISODIR}/vn.which`
-	newfs /dev/`cat ${ISODIR}/vn.which`s1a
-	mount /dev/`cat ${ISODIR}/vn.which`s1a ${IMGMNT}
+	disklabel -B `cat ${ISODIR}/vn.which`s2
+	newfs /dev/`cat ${ISODIR}/vn.which`s2a
+	mount /dev/`cat ${ISODIR}/vn.which`s2a ${IMGMNT}
 	cpdup ${ISOROOT} ${IMGMNT}
 	@echo "STEP: fixup ${IMGMNT}/etc/fstab"
-	echo "/dev/${IMGUSBDEV}s1a / ufs rw,noatime 0 1" > ${IMGMNT}/etc/fstab
+	echo "/dev/${IMGUSBDEV}s2a / ufs rw,noatime 0 1" > ${IMGMNT}/etc/fstab
 	echo "dummy /tmp tmpfs rw 0 0" >> ${IMGMNT}/etc/fstab
 	echo "dummy /var/tmp tmpfs rw 0 0" >> ${IMGMNT}/etc/fstab
 	echo "dummy /var/run tmpfs rw 0 0" >> ${IMGMNT}/etc/fstab
@@ -377,7 +402,7 @@ mkimg:
 	echo "proc /proc procfs rw 0 0" >> ${IMGMNT}/etc/fstab
 	@echo "STEP: fixup ${IMGMNT}/boot/loader.conf"
 	-fgrep -v kernel_options ${IMGMNT}/boot/loader.conf > ${IMGMNT}/boot/loader.conf.new
-	echo 'vfs.root.mountfrom="ufs:${IMGUSBDEV}s1a"' >> ${IMGMNT}/boot/loader.conf.new
+	echo 'vfs.root.mountfrom="ufs:${IMGUSBDEV}s2a"' >> ${IMGMNT}/boot/loader.conf.new
 	mv ${IMGMNT}/boot/loader.conf.new ${IMGMNT}/boot/loader.conf
 	@echo "STEP: cleanup"
 	df ${IMGMNT}
-- 
2.41.0