Merge pull request #2704 from rbwsam/ref/2663

ref(pkg/chartutil): decrease map lookups

pkg/chartutil/values.go

@@ -278,17 +278,13 @@ func coalesceValues(c *chart.Chart, v map[string]interface{}) (map[string]interf
 	}
 
 	for key, val := range nv {
-		if _, ok := v[key]; !ok {
+		if value, ok := v[key]; ok {
-			// If the key is not in v, copy it from nv.
+			if value == nil {
-			v[key] = val
-		} else if ok && v[key] == nil {
 				// When the YAML value is null, we remove the value's key.
 				// This allows Helm's various sources of values (value files or --set) to
 				// remove incompatible keys from any previous chart, file, or set values.
-			// ref: http://www.yaml.org/spec/1.2/spec.html#id2803362
 				delete(v, key)
-			continue
+			} else if dest, ok := value.(map[string]interface{}); ok {
-		} else if dest, ok := v[key].(map[string]interface{}); ok {
 				// if v[key] is a table, merge nv's val table into v[key].
 				src, ok := val.(map[string]interface{})
 				if !ok {
@@ -299,6 +295,10 @@ func coalesceValues(c *chart.Chart, v map[string]interface{}) (map[string]interf
 				// values.
 				coalesceTables(dest, src)
 			}
+		} else {
+			// If the key is not in v, copy it from nv.
+			v[key] = val
+		}
 	}
 	return v, nil
 }

pkg/chartutil/values_test.go

@@ -275,6 +275,7 @@ func ttpl(tpl string, v map[string]interface{}) (string, error) {
 	return b.String(), nil
 }
 
+// ref: http://www.yaml.org/spec/1.2/spec.html#id2803362
 var testCoalesceValuesYaml = `
 top: yup
 bottom: null