From fab369bf159e238a5c4dad10942cd72c51772eef Mon Sep 17 00:00:00 2001
From: Armon Dadgar <armon.dadgar@gmail.com>
Date: Thu, 5 Sep 2013 11:09:37 -0700
Subject: [PATCH] Adding support for isotime template variable

---
 packer/config_template.go      |  5 +++++
 packer/config_template_test.go | 22 ++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/packer/config_template.go b/packer/config_template.go
index 354208cbc..b829521ae 100644
--- a/packer/config_template.go
+++ b/packer/config_template.go
@@ -26,6 +26,7 @@ func NewConfigTemplate() (*ConfigTemplate, error) {
 
 	result.root = template.New("configTemplateRoot")
 	result.root.Funcs(template.FuncMap{
+		"isotime":   templateISOTime,
 		"timestamp": templateTimestamp,
 		"user":      result.templateUser,
 	})
@@ -79,3 +80,7 @@ func (t *ConfigTemplate) templateUser(n string) (string, error) {
 func templateTimestamp() string {
 	return strconv.FormatInt(time.Now().UTC().Unix(), 10)
 }
+
+func templateISOTime() string {
+	return time.Now().UTC().Format(time.RFC3339)
+}
diff --git a/packer/config_template_test.go b/packer/config_template_test.go
index 4c4864cda..646565418 100644
--- a/packer/config_template_test.go
+++ b/packer/config_template_test.go
@@ -7,6 +7,28 @@ import (
 	"time"
 )
 
+func TestConfigTemplateProcess_isotime(t *testing.T) {
+	tpl, err := NewConfigTemplate()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	result, err := tpl.Process(`{{isotime}}`, nil)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	val, err := time.Parse(time.RFC3339, result)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	currentTime := time.Now().UTC()
+	if currentTime.Sub(val) > 2*time.Second {
+		t.Fatalf("val: %d (current: %d)", val, currentTime)
+	}
+}
+
 func TestConfigTemplateProcess_timestamp(t *testing.T) {
 	tpl, err := NewConfigTemplate()
 	if err != nil {