Added Config.Options so we can support arbitrary key-value configuration

client/config/config.go

@@ -40,4 +40,27 @@ type Config struct {
 
 	// Node provides the base node
 	Node *structs.Node
+
+	// Options provides arbitrary key-value configuration for nomad internals,
+	// like fingerprinters and drivers. The format is:
+	//
+	//	namespace.option = value
+	Options map[string]string
+}
+
+func NewConfig() Config {
+	config := Config{
+		Node:    &structs.Node{},
+		Options: map[string]string{},
+	}
+	return config
+}
+
+// GetOpt returns the specified configuration value or "".
+func (c *Config) Read(id string) string {
+	val, ok := c.Options[id]
+	if !ok {
+		return ""
+	}
+	return val
 }