helper/config: decode time durations

helper/config/decode.go

@@ -66,6 +66,7 @@ func Decode(target interface{}, config *DecodeOpts, raws ...interface{}) error {
 		DecodeHook: mapstructure.ComposeDecodeHookFunc(
 			uint8ToStringHook,
 			mapstructure.StringToSliceHookFunc(","),
+			mapstructure.StringToTimeDurationHookFunc(),
 		),
 	})
 	if err != nil {

helper/config/decode_test.go

@@ -3,6 +3,7 @@ package config
 import (
 	"reflect"
 	"testing"
+	"time"
 
 	"github.com/mitchellh/packer/template/interpolate"
 )
@@ -11,6 +12,7 @@ func TestDecode(t *testing.T) {
 	type Target struct {
 		Name    string
 		Address string
+		Time    time.Duration
 	}
 
 	cases := map[string]struct {
@@ -22,10 +24,12 @@ func TestDecode(t *testing.T) {
 			[]interface{}{
 				map[string]interface{}{
 					"name": "bar",
+					"time": "5s",
 				},
 			},
 			&Target{
 				Name: "bar",
+				Time: 5 * time.Second,
 			},
 			nil,
 		},