config.FileDef: add Content64 for base64-encoded content

config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"encoding/base64"
 	"fmt"
 	"io"
 	"net"
@@ -133,11 +134,12 @@ type UserDef struct {
 }
 
 type FileDef struct {
-	Path    string
-	Mode    os.FileMode
-	Content string
-	Symlink string
-	Dir     bool
+	Path      string
+	Mode      os.FileMode
+	Content   string
+	Content64 string
+	Symlink   string
+	Dir       bool
 }
 
 type NetworkDef struct {
@@ -158,6 +160,13 @@ type NetworkDef struct {
 func (c *Config) FileContent(filePath string) []byte {
 	for _, f := range c.Files {
 		if f.Path == filePath {
+			if f.Content64 != "" {
+				decoded, err := base64.StdEncoding.DecodeString(f.Content64)
+				if err != nil {
+					panic(fmt.Errorf("invalid base64 content in file %s", f.Path))
+				}
+				return decoded
+			}
 			return []byte(f.Content)
 		}
 	}