Add a raw action

raw_action.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"os"
+	"log"
+	"strconv"
+	"path"
+	"io/ioutil"
+)
+
+type RawAction struct {
+	*BaseAction
+	Offset string
+	Source string
+	Path string
+}
+
+func (raw *RawAction) Verify(context YaibContext) {
+	if raw.Source != "rootdir" {
+		log.Fatal("Only suppport sourcing from filesystem")
+	}
+}
+
+func (raw *RawAction) Run(context *YaibContext) {
+	s := path.Join(context.rootdir, raw.Path)
+	content, err := ioutil.ReadFile(s)
+
+	if err != nil {
+		log.Fatalf("Failed to read %s\n", s)
+	}
+
+	target, err := os.OpenFile(context.image, os.O_WRONLY, 0)
+	if err != nil {
+		log.Fatalf("Failed to open image file %v\n", err)
+	}
+
+  offset, err := strconv.ParseInt(raw.Offset, 0, 64)
+	if err != nil {
+		log.Fatalf("Couldn't parse offset %v\n", err)
+	}
+	bytes, err := target.WriteAt(content, offset)
+	if bytes != len(content) {
+		log.Fatal("Couldn't write complte data")
+	}
+}

yaib.go

@@ -233,6 +233,8 @@ func (y *YamlAction) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		y.Action = &OverlayAction{}
 	case "setup-image":
 		y.Action = &SetupImage{}
+	case "raw":
+		y.Action = &RawAction{}
 	default:
 		log.Fatalf("Unknown action: %v", aux.Action)
 	}