terraform: computed key

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
 

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...)