mts/meta: created NewFromMap method

container/mts/meta/meta.go

@@ -90,6 +90,17 @@ func NewWith(data [][2]string) *Data {
 	return m
 }
 
+// NewFromMap creates a meta.Data from a map.
+func NewFromMap(data map[string]string) *Data {
+	m := New()
+	m.order = make([]string, 0, len(data))
+	for k, v := range data {
+		m.data[k] = v
+		m.order = append(m.order, k)
+	}
+	return m
+}
+
 // Add adds metadata with key and val.
 func (m *Data) Add(key, val string) {
 	m.mu.Lock()