terraform: add ID to diff implicitly

builtin/providers/aws/resource_aws_security_group.go

@@ -4,9 +4,9 @@ import (
 	"fmt"
 	"log"
 
+	"github.com/hashicorp/terraform/flatmap"
 	"github.com/hashicorp/terraform/helper/diff"
 	"github.com/hashicorp/terraform/terraform"
-	"github.com/hashicorp/terraform/flatmap"
 	"github.com/mitchellh/goamz/ec2"
 )
 

terraform/context.go

@@ -532,6 +532,26 @@ func (c *Context) planWalkFn(result *Plan) depgraph.WalkFunc {
 			}
 		}
 
+		if diff == nil {
+			diff = new(ResourceDiff)
+		}
+
+		if diff.RequiresNew() && r.State.ID != "" {
+			// This will also require a destroy
+			diff.Destroy = true
+		}
+
+		if diff.RequiresNew() || r.State.ID == "" {
+			// Add diff to compute new ID
+			diff.init()
+			diff.Attributes["id"] = &ResourceAttrDiff{
+				Old:         r.State.Attributes["id"],
+				NewComputed: true,
+				RequiresNew: true,
+				Type:        DiffAttrOutput,
+			}
+		}
+
 		l.Lock()
 		if !diff.Empty() {
 			result.Diff.Resources[r.Id] = diff
@@ -752,7 +772,10 @@ func (c *Context) genericWalkFn(cb genericWalkFunc) depgraph.WalkFunc {
 		}()
 
 		// Call the callack
-		log.Printf("[INFO] Walking: %s", rn.Resource.Id)
+		log.Printf(
+			"[INFO] Walking: %s (Graph node: %s)",
+			rn.Resource.Id,
+			n.Name)
 		if err := cb(rn.Resource); err != nil {
 			log.Printf("[ERROR] Error walking '%s': %s", rn.Resource.Id, err)
 			return err

terraform/context_test.go

@@ -180,8 +180,6 @@ func TestContextApply_Minimal(t *testing.T) {
 		t.Fatalf("err: %s", err)
 	}
 
-	ctx.variables = map[string]string{"value": "1"}
-
 	state, err := ctx.Apply()
 	if err != nil {
 		t.Fatalf("err: %s", err)
@@ -242,7 +240,9 @@ func TestContextApply_cancel(t *testing.T) {
 	// Start the Apply in a goroutine
 	stateCh := make(chan *State)
 	go func() {
+		println("START")
 		state, err := ctx.Apply()
+		println("STOP")
 		if err != nil {
 			panic(err)
 		}
@@ -714,6 +714,29 @@ func TestContextPlan(t *testing.T) {
 	}
 }
 
+func TestContextPlan_minimal(t *testing.T) {
+	c := testConfig(t, "plan-empty")
+	p := testProvider("aws")
+	p.DiffFn = testDiffFn
+	ctx := testContext(t, &ContextOpts{
+		Config: c,
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+	})
+
+	plan, err := ctx.Plan(nil)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(plan.String())
+	expected := strings.TrimSpace(testTerraformPlanEmptyStr)
+	if actual != expected {
+		t.Fatalf("bad:\n%s", actual)
+	}
+}
+
 func TestContextPlan_nil(t *testing.T) {
 	c := testConfig(t, "plan-nil")
 	p := testProvider("aws")
@@ -723,6 +746,14 @@ func TestContextPlan_nil(t *testing.T) {
 		Providers: map[string]ResourceProviderFactory{
 			"aws": testProviderFuncFixed(p),
 		},
+		State: &State{
+			Resources: map[string]*ResourceState{
+				"aws_instance.foo": &ResourceState{
+					ID:   "bar",
+					Type: "aws_instance",
+				},
+			},
+		},
 	})
 
 	plan, err := ctx.Plan(nil)

terraform/diff.go

@@ -115,6 +115,10 @@ func (d *Diff) String() string {
 		keyLen := 0
 		keys := make([]string, 0, len(rdiff.Attributes))
 		for key, _ := range rdiff.Attributes {
+			if key == "id" {
+				continue
+			}
+
 			keys = append(keys, key)
 			if len(key) > keyLen {
 				keyLen = len(key)
@@ -152,6 +156,8 @@ func (d *Diff) String() string {
 type ResourceDiff struct {
 	Attributes map[string]*ResourceAttrDiff
 	Destroy    bool
+
+	once sync.Once
 }
 
 // ResourceAttrDiff is the diff of a single attribute of a resource.
@@ -177,6 +183,14 @@ const (
 	DiffAttrOutput
 )
 
+func (d *ResourceDiff) init() {
+	d.once.Do(func() {
+		if d.Attributes == nil {
+			d.Attributes = make(map[string]*ResourceAttrDiff)
+		}
+	})
+}
+
 // Empty returns true if this diff encapsulates no changes.
 func (d *ResourceDiff) Empty() bool {
 	if d == nil {

terraform/graph.go

@@ -273,7 +273,7 @@ func graphAddDiff(g *depgraph.Graph, d *Diff) error {
 			continue
 		}
 
-		if rd.Destroy || rd.RequiresNew() {
+		if rd.Destroy {
 			// If we're destroying, we create a new destroy node with
 			// the proper dependencies. Perform a dirty copy operation.
 			newNode := new(GraphNodeResource)

terraform/resource.go

@@ -129,6 +129,10 @@ func (c *ResourceConfig) IsSet(k string) bool {
 }
 
 func (c *ResourceConfig) interpolate(ctx *Context) error {
+	if c == nil {
+		return nil
+	}
+
 	if ctx != nil {
 		if err := ctx.computeVars(c.raw); err != nil {
 			return err

terraform/terraform_test.go

@@ -110,10 +110,8 @@ aws_instance.foo:
 const testTerraformApplyMinimalStr = `
 aws_instance.bar:
   ID = foo
-  type = aws_instance
 aws_instance.foo:
   ID = foo
-  type = aws_instance
 `
 
 const testTerraformApplyDestroyStr = `
@@ -216,10 +214,10 @@ aws_instance.foo:
 const testTerraformPlanStr = `
 DIFF:
 
-UPDATE: aws_instance.bar
+CREATE: aws_instance.bar
   foo:  "" => "2"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo
+CREATE: aws_instance.foo
   num:  "" => "2"
   type: "" => "aws_instance"
 
@@ -231,10 +229,10 @@ STATE:
 const testTerraformPlanComputedStr = `
 DIFF:
 
-UPDATE: aws_instance.bar
+CREATE: aws_instance.bar
   foo:  "" => "<computed>"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo
+CREATE: aws_instance.foo
   foo:  "" => "<computed>"
   num:  "" => "2"
   type: "" => "aws_instance"
@@ -247,10 +245,10 @@ STATE:
 const testTerraformPlanComputedIdStr = `
 DIFF:
 
-UPDATE: aws_instance.bar
+CREATE: aws_instance.bar
   foo:  "" => "<computed>"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo
+CREATE: aws_instance.foo
   foo:  "" => "<computed>"
   num:  "" => "2"
   type: "" => "aws_instance"
@@ -263,22 +261,22 @@ STATE:
 const testTerraformPlanCountStr = `
 DIFF:
 
-UPDATE: aws_instance.bar
+CREATE: aws_instance.bar
   foo:  "" => "foo,foo,foo,foo,foo"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo.0
+CREATE: aws_instance.foo.0
   foo:  "" => "foo"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo.1
+CREATE: aws_instance.foo.1
   foo:  "" => "foo"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo.2
+CREATE: aws_instance.foo.2
   foo:  "" => "foo"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo.3
+CREATE: aws_instance.foo.3
   foo:  "" => "foo"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo.4
+CREATE: aws_instance.foo.4
   foo:  "" => "foo"
   type: "" => "aws_instance"
 
@@ -290,7 +288,7 @@ STATE:
 const testTerraformPlanCountDecreaseStr = `
 DIFF:
 
-UPDATE: aws_instance.bar
+CREATE: aws_instance.bar
   foo:  "" => "bar"
   type: "" => "aws_instance"
 DESTROY: aws_instance.foo.1
@@ -311,13 +309,13 @@ aws_instance.foo.2:
 const testTerraformPlanCountIncreaseStr = `
 DIFF:
 
-UPDATE: aws_instance.bar
+CREATE: aws_instance.bar
   foo:  "" => "bar"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo.1
+CREATE: aws_instance.foo.1
   foo:  "" => "foo"
   type: "" => "aws_instance"
-UPDATE: aws_instance.foo.2
+CREATE: aws_instance.foo.2
   foo:  "" => "foo"
   type: "" => "aws_instance"
 
@@ -343,11 +341,22 @@ aws_instance.two:
   ID = baz
 `
 
+const testTerraformPlanEmptyStr = `
+DIFF:
+
+CREATE: aws_instance.bar
+CREATE: aws_instance.foo
+
+STATE:
+
+<no state>
+`
+
 const testTerraformPlanOrphanStr = `
 DIFF:
 
 DESTROY: aws_instance.baz
-UPDATE: aws_instance.foo
+CREATE: aws_instance.foo
   num:  "" => "2"
   type: "" => "aws_instance"
 
@@ -360,7 +369,7 @@ aws_instance.baz:
 const testTerraformPlanStateStr = `
 DIFF:
 
-UPDATE: aws_instance.bar
+CREATE: aws_instance.bar
   foo:  "" => "2"
   type: "" => "aws_instance"
 UPDATE: aws_instance.foo

terraform/test-fixtures/plan-empty/main.tf

@@ -0,0 +1,5 @@
+resource "aws_instance" "foo" {
+}
+
+resource "aws_instance" "bar" {
+}