Index: head/release/amd64/mkisoimages.sh
===================================================================
--- head/release/amd64/mkisoimages.sh	(revision 333004)
+++ head/release/amd64/mkisoimages.sh	(revision 333005)
@@ -1,86 +1,98 @@
 #!/bin/sh
 #
 # Module: mkisoimages.sh
 # Author: Jordan K Hubbard
 # Date:   22 June 2001
 #
 # $FreeBSD$
 #
 # This script is used by release/Makefile to build the (optional) ISO images
 # for a FreeBSD release.  It is considered architecture dependent since each
 # platform has a slightly unique way of making bootable CDs.  This script
 # is also allowed to generate any number of images since that is more of
 # publishing decision than anything else.
 #
 # Usage:
 #
 # mkisoimages.sh [-b] image-label image-name base-bits-dir [extra-bits-dir]
 #
 # Where -b is passed if the ISO image should be made "bootable" by
 # whatever standards this architecture supports (may be unsupported),
 # image-label is the ISO image label, image-name is the filename of the
 # resulting ISO image, base-bits-dir contains the image contents and
 # extra-bits-dir, if provided, contains additional files to be merged
 # into base-bits-dir as part of making the image.
 
+if [ -z $ETDUMP ]; then
+	ETDUMP=etdump
+fi
+
+if [ -z $MAKEFS ]; then
+	MAKEFS=makefs
+fi
+
+if [ -z $MKIMG ]; then
+	MKIMG=mkimg
+fi
+
 if [ "$1" = "-b" ]; then
 	# This is highly x86-centric and will be used directly below.
 	bootable="-o bootimage=i386;$4/boot/cdboot -o no-emul-boot"
 
 	# Make EFI system partition (should be done with makefs in the future)
 	dd if=/dev/zero of=efiboot.img bs=4k count=200
 	device=`mdconfig -a -t vnode -f efiboot.img`
 	newfs_msdos -F 12 -m 0xf8 /dev/$device
 	mkdir efi
 	mount -t msdosfs /dev/$device efi
 	mkdir -p efi/efi/boot
 	cp "$4/boot/loader.efi" efi/efi/boot/bootx64.efi
 	umount efi
 	rmdir efi
 	mdconfig -d -u $device
 	bootable="$bootable -o bootimage=i386;efiboot.img -o no-emul-boot -o platformid=efi"
 	
 	shift
 else
 	bootable=""
 fi
 
 if [ $# -lt 3 ]; then
 	echo "Usage: $0 [-b] image-label image-name base-bits-dir [extra-bits-dir]"
 	exit 1
 fi
 
 LABEL=`echo "$1" | tr '[:lower:]' '[:upper:]'`; shift
 NAME="$1"; shift
 
 publisher="The FreeBSD Project.  https://www.FreeBSD.org/"
 echo "/dev/iso9660/$LABEL / cd9660 ro 0 0" > "$1/etc/fstab"
-makefs -t cd9660 $bootable -o rockridge -o label="$LABEL" -o publisher="$publisher" "$NAME" "$@"
+$MAKEFS -t cd9660 $bootable -o rockridge -o label="$LABEL" -o publisher="$publisher" "$NAME" "$@"
 rm -f "$1/etc/fstab"
 rm -f efiboot.img
 
 if [ "$bootable" != "" ]; then
 	# Look for the EFI System Partition image we dropped in the ISO image.
-	for entry in `etdump --format shell $NAME`; do
+	for entry in `$ETDUMP --format shell $NAME`; do
 		eval $entry
 		if [ "$et_platform" = "efi" ]; then
 			espstart=`expr $et_lba \* 2048`
 			espsize=`expr $et_sectors \* 512`
 			espparam="-p efi::$espsize:$espstart"
 			break
 		fi
 	done
 
 	# Create a GPT image containing the partitions we need for hybrid boot.
 	imgsize=`stat -f %z $NAME`
-	mkimg -s gpt \
+	$MKIMG -s gpt \
 	    --capacity $imgsize \
 	    -b $4/boot/pmbr \
 	    $espparam \
 	    -p freebsd-boot:=$4/boot/isoboot \
 	    -o hybrid.img
 
 	# Drop the PMBR, GPT, and boot code into the System Area of the ISO.
 	dd if=hybrid.img of=$NAME bs=32k count=1 conv=notrunc
 	rm -f hybrid.img
 fi