From 4397c566a0df4e38803a51820e06c31f0798e405 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Thu, 5 Jun 2014 12:09:25 -0700
Subject: [PATCH] terraform: computed key

---
 terraform/semantics.go | 5 +++--
 terraform/terraform.go | 5 +++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/terraform/semantics.go b/terraform/semantics.go
index 2499bb6f7d..0e8a64e9bb 100644
--- a/terraform/semantics.go
+++ b/terraform/semantics.go
@@ -7,8 +7,9 @@ import (
 	"github.com/hashicorp/terraform/config"
 )
 
-// smcProviders matches up the resources with a provider
-// those providers and does the initial `Configure` on the provider.
+// smcProviders matches up the resources with a provider and initializes
+// it. This does not call "Configure" on the ResourceProvider, since that
+// might actually depend on upstream resources.
 func smcProviders(c *Config) (map[*config.Resource]ResourceProvider, []error) {
 	var errs []error
 
diff --git a/terraform/terraform.go b/terraform/terraform.go
index de91e307ff..3f54151241 100644
--- a/terraform/terraform.go
+++ b/terraform/terraform.go
@@ -24,6 +24,8 @@ type Config struct {
 	Config    *config.Config
 	Providers map[string]ResourceProviderFactory
 	Variables map[string]string
+
+	computedPlaceholder string
 }
 
 // New creates a new Terraform structure, initializes resource providers
@@ -35,6 +37,9 @@ type Config struct {
 func New(c *Config) (*Terraform, error) {
 	var errs []error
 
+	// Calculate the computed key placeholder
+	c.computedPlaceholder = "tf_computed_placeholder"
+
 	// Validate that all required variables have values
 	if err := smcVariables(c); err != nil {
 		errs = append(errs, err...)