BuildSystem: Add option to generate an ISO file

This creates ISO file with compressed initrd and grub files that can be
live booted easily

script/build.sh

@@ -56,6 +56,12 @@ create_image () {
 	$BANAN_SCRIPT_DIR/image.sh "$1"
 }
 
+create_iso () {
+	build_target all
+	build_target install
+	$BANAN_SCRIPT_DIR/iso.sh
+}
+
 run_qemu () {
 	create_image
 	$BANAN_SCRIPT_DIR/qemu.sh $@
@@ -103,6 +109,9 @@ case $1 in
 	image-full)
 		create_image full
 		;;
+	iso)
+		create_iso
+		;;
 	qemu)
 		run_qemu -serial stdio $QEMU_ACCEL
 		;;

script/config.sh

@@ -26,6 +26,7 @@ export BANAN_SYSROOT="$BANAN_BUILD_DIR/sysroot"
 export BANAN_FAKEROOT="$BANAN_BUILD_DIR/fakeroot-context"
 
 export BANAN_DISK_IMAGE_PATH="$BANAN_BUILD_DIR/banan-os.img"
+export BANAN_ISO_PATH="$BANAN_BUILD_DIR/banan-os.iso"
 
 if [[ -z $BANAN_UEFI_BOOT ]]; then
 	export BANAN_UEFI_BOOT=0

script/iso.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+if [ -z $BANAN_ISO_PATH ]; then
+	echo  "You must set the BANAN_ISO_PATH environment variable" >&2
+	exit 1
+fi
+
+if [ -z $BANAN_SYSROOT ]; then
+	echo  "You must set the BANAN_SYSROOT environment variable" >&2
+	exit 1
+fi
+
+if [ -z $BANAN_FAKEROOT ]; then
+	echo  "You must set the BANAN_FAKEROOT environment variable" >&2
+	exit 1
+fi
+
+if [ -z $BANAN_BUILD_DIR ]; then
+	echo  "You must set the BANAN_BUILD_DIR environment variable" >&2
+	exit 1
+fi
+
+set -u
+
+iso_dir="$BANAN_BUILD_DIR/iso"
+
+rm -rf "$iso_dir"
+mkdir -p "$iso_dir/boot/grub"
+
+echo "Packing initrd"
+fakeroot -i "$BANAN_FAKEROOT" tar -C "$BANAN_SYSROOT" --exclude='./boot' -zcf "$iso_dir/boot/banan-os.initrd" .
+
+strip -o "$iso_dir/boot/banan-os.kernel" --strip-unneeded "$BANAN_BUILD_DIR/kernel/banan-os.kernel"
+
+cat > "$iso_dir/boot/grub/grub.cfg" << EOF
+insmod all_video
+menuentry "banan-os" {
+	multiboot2 /boot/banan-os.kernel readonly
+	module2 --nounzip /boot/banan-os.initrd
+}
+EOF
+
+echo "Creating ISO"
+grub-mkrescue --compress=gz -o "$BANAN_ISO_PATH" "$iso_dir" >/dev/null