Add ipxe support

pkg/config/tftpget.go

@@ -0,0 +1,41 @@
+package config
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+	"net/url"
+
+	"gopkg.in/pin/tftp.v2"
+	"sigs.k8s.io/yaml"
+)
+
+func tftpGet(tftpURL string) (map[string]interface{}, error) {
+	u, err := url.Parse(tftpURL)
+	if err != nil {
+		return nil, err
+	}
+
+	host, _, err := net.SplitHostPort(u.Host)
+	if err != nil {
+		host = u.Host + ":69"
+	}
+
+	fmt.Printf("Downloading config from host %s, file %s\n", host, u.Path)
+	client, err := tftp.NewClient(host)
+	if err != nil {
+		return nil, err
+	}
+	writerTo, err := client.Receive(u.Path, "octet")
+	if err != nil {
+		return nil, err
+	}
+
+	buf := &bytes.Buffer{}
+	if _, err := writerTo.WriteTo(buf); err != nil {
+		return nil, err
+	}
+
+	result := map[string]interface{}{}
+	return result, yaml.Unmarshal(buf.Bytes(), &result)
+}