Add ipxe support

cmd/ros-installer/main.go

@@ -2,18 +2,36 @@ package main
 
 import (
 	"flag"
+	"os"
 
+	"github.com/rancher/os/pkg/config"
 	"github.com/rancher/os/pkg/install"
 	"github.com/sirupsen/logrus"
+	"sigs.k8s.io/yaml"
 )
 
 var (
-	output = flag.Bool("automatic", false, "Check for and run automatic installation")
+	output      = flag.Bool("automatic", false, "Check for and run automatic installation")
+	printConfig = flag.Bool("print-config", false, "Print effective configuration and exit")
+	configFile  = flag.String("config-file", "", "Config file to use, local file or http/tftp URL")
 )
 
 func main() {
 	flag.Parse()
-	if err := install.Run(*output); err != nil {
+	if *printConfig {
+		cfg, err := config.ReadConfig(*configFile)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+		data, err := yaml.Marshal(cfg)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+		os.Stdout.Write(data)
+		return
+	}
+
+	if err := install.Run(*output, *configFile); err != nil {
 		logrus.Fatal(err)
 	}
 }