add qcow2 and vmdk boot images

cmd/dkl-local-server/boot-img.go

@@ -56,6 +56,55 @@ func buildBootImgGZ(out io.Writer, ctx *renderContext) (err error) {
 	return
 }
 
+func buildBootImgQemuConvert(out io.Writer, ctx *renderContext, format string) (err error) {
+	imgPath, err := func() (imgPath string, err error) {
+		bootImg, err := os.CreateTemp(os.TempDir(), "boot.img-")
+		if err != nil {
+			return
+		}
+		defer rmTempFile(bootImg)
+
+		err = setupBootImage(bootImg, ctx)
+		if err != nil {
+			return
+		}
+
+		err = bootImg.Sync()
+		if err != nil {
+			return
+		}
+
+		imgPath = bootImg.Name() + "." + format
+
+		err = run("qemu-img", "convert", "-f", "raw", "-O", format, bootImg.Name(), imgPath)
+		if err != nil {
+			return
+		}
+		return
+	}()
+
+	defer os.Remove(imgPath)
+
+	if err != nil {
+		return
+	}
+
+	// send the result
+	img, err := os.Open(imgPath)
+	if err != nil {
+		return
+	}
+
+	io.Copy(out, img)
+	return
+}
+func buildBootQcow2(out io.Writer, ctx *renderContext) (err error) {
+	return buildBootImgQemuConvert(out, ctx, "qcow2")
+}
+func buildBootVmdk(out io.Writer, ctx *renderContext) (err error) {
+	return buildBootImgQemuConvert(out, ctx, "vmdk")
+}
+
 var grubSupportVersion = flag.String("grub-support", "1.1.0", "GRUB support version")
 
 func setupBootImage(bootImg *os.File, ctx *renderContext) (err error) {