Merge pull request #3393 from TimeIncOSS/b-destroy-cross-providers

Ignore missing variables during destroy phase

terraform/context.go

@@ -292,7 +292,11 @@ func (c *Context) Apply() (*State, error) {
 	}
 
 	// Do the walk
-	_, err = c.walk(graph, walkApply)
+	if c.destroy {
+		_, err = c.walk(graph, walkDestroy)
+	} else {
+		_, err = c.walk(graph, walkApply)
+	}
 
 	// Clean out any unused things
 	c.state.prune()

terraform/context_apply_test.go

@@ -10,6 +10,8 @@ import (
 	"sync/atomic"
 	"testing"
 	"time"
+
+	"github.com/hashicorp/terraform/config/module"
 )
 
 func TestContext2Apply(t *testing.T) {
@@ -298,6 +300,88 @@ func TestContext2Apply_destroyComputed(t *testing.T) {
 	}
 }
 
+// https://github.com/hashicorp/terraform/issues/2892
+func TestContext2Apply_destroyCrossProviders(t *testing.T) {
+	m := testModule(t, "apply-destroy-cross-providers")
+
+	p_aws := testProvider("aws")
+	p_aws.ApplyFn = testApplyFn
+	p_aws.DiffFn = testDiffFn
+
+	p_tf := testProvider("terraform")
+	p_tf.ApplyFn = testApplyFn
+	p_tf.DiffFn = testDiffFn
+
+	providers := map[string]ResourceProviderFactory{
+		"aws":       testProviderFuncFixed(p_aws),
+		"terraform": testProviderFuncFixed(p_tf),
+	}
+
+	// Bug only appears from time to time,
+	// so we run this test multiple times
+	// to check for the race-condition
+	for i := 0; i <= 10; i++ {
+		ctx := getContextForApply_destroyCrossProviders(
+			t, m, providers)
+
+		if p, err := ctx.Plan(); err != nil {
+			t.Fatalf("err: %s", err)
+		} else {
+			t.Logf(p.String())
+		}
+
+		if _, err := ctx.Apply(); err != nil {
+			t.Fatalf("err: %s", err)
+		}
+	}
+}
+
+func getContextForApply_destroyCrossProviders(
+	t *testing.T,
+	m *module.Tree,
+	providers map[string]ResourceProviderFactory) *Context {
+	state := &State{
+		Modules: []*ModuleState{
+			&ModuleState{
+				Path: rootModulePath,
+				Resources: map[string]*ResourceState{
+					"terraform_remote_state.shared": &ResourceState{
+						Type: "terraform_remote_state",
+						Primary: &InstanceState{
+							ID: "remote-2652591293",
+							Attributes: map[string]string{
+								"output.env_name": "test",
+							},
+						},
+					},
+				},
+			},
+			&ModuleState{
+				Path: []string{"root", "example"},
+				Resources: map[string]*ResourceState{
+					"aws_vpc.bar": &ResourceState{
+						Type: "aws_vpc",
+						Primary: &InstanceState{
+							ID: "vpc-aaabbb12",
+							Attributes: map[string]string{
+								"value": "test",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+	ctx := testContext2(t, &ContextOpts{
+		Module:    m,
+		Providers: providers,
+		State:     state,
+		Destroy:   true,
+	})
+
+	return ctx
+}
+
 func TestContext2Apply_minimal(t *testing.T) {
 	m := testModule(t, "apply-minimal")
 	p := testProvider("aws")

terraform/evaltree_provider.go

@@ -71,7 +71,7 @@ func ProviderEvalTree(n string, config *config.RawConfig) EvalNode {
 
 	// Apply stuff
 	seq = append(seq, &EvalOpFilter{
-		Ops: []walkOperation{walkRefresh, walkPlan, walkApply},
+		Ops: []walkOperation{walkRefresh, walkPlan, walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				&EvalGetProvider{
@@ -98,7 +98,7 @@ func ProviderEvalTree(n string, config *config.RawConfig) EvalNode {
 	// We configure on everything but validate, since validate may
 	// not have access to all the variables.
 	seq = append(seq, &EvalOpFilter{
-		Ops: []walkOperation{walkRefresh, walkPlan, walkApply},
+		Ops: []walkOperation{walkRefresh, walkPlan, walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				&EvalConfigProvider{

terraform/graph_config_node_output.go

@@ -44,7 +44,7 @@ func (n *GraphNodeConfigOutput) DependentOn() []string {
 // GraphNodeEvalable impl.
 func (n *GraphNodeConfigOutput) EvalTree() EvalNode {
 	return &EvalOpFilter{
-		Ops: []walkOperation{walkRefresh, walkPlan, walkApply},
+		Ops: []walkOperation{walkRefresh, walkPlan, walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				&EvalWriteOutput{

terraform/graph_walk_operation.go

@@ -13,4 +13,5 @@ const (
 	walkPlanDestroy
 	walkRefresh
 	walkValidate
+	walkDestroy
 )

terraform/interpolate.go

@@ -342,7 +342,7 @@ func (i *Interpolater) computeResourceVariable(
 	// TODO: test by creating a state and configuration that is referencing
 	// a non-existent variable "foo.bar" where the state only has "foo"
 	// and verify plan works, but apply doesn't.
-	if i.Operation == walkApply {
+	if i.Operation == walkApply || i.Operation == walkDestroy {
 		goto MISSING
 	}
 
@@ -384,7 +384,7 @@ MISSING:
 	//
 	// For an input walk, computed values are okay to return because we're only
 	// looking for missing variables to prompt the user for.
-	if i.Operation == walkRefresh || i.Operation == walkPlanDestroy || i.Operation == walkInput {
+	if i.Operation == walkRefresh || i.Operation == walkPlanDestroy || i.Operation == walkDestroy || i.Operation == walkInput {
 		return config.UnknownVariableValue, nil
 	}
 
@@ -481,7 +481,7 @@ func (i *Interpolater) computeResourceMultiVariable(
 		//
 		// For an input walk, computed values are okay to return because we're only
 		// looking for missing variables to prompt the user for.
-		if i.Operation == walkRefresh || i.Operation == walkPlanDestroy || i.Operation == walkInput {
+		if i.Operation == walkRefresh || i.Operation == walkPlanDestroy || i.Operation == walkDestroy || i.Operation == walkInput {
 			return config.UnknownVariableValue, nil
 		}
 

terraform/test-fixtures/apply-destroy-cross-providers/child/main.tf

@@ -0,0 +1,5 @@
+variable "value" {}
+
+resource "aws_vpc" "bar" {
+    value = "${var.value}"
+}

terraform/test-fixtures/apply-destroy-cross-providers/main.tf

@@ -0,0 +1,6 @@
+resource "terraform_remote_state" "shared" {}
+
+module "child" {
+    source = "./child"
+    value = "${terraform_remote_state.shared.output.env_name}"
+}

terraform/transform_deposed.go

@@ -110,7 +110,7 @@ func (n *graphNodeDeposedResource) EvalTree() EvalNode {
 	var diff *InstanceDiff
 	var err error
 	seq.Nodes = append(seq.Nodes, &EvalOpFilter{
-		Ops: []walkOperation{walkApply},
+		Ops: []walkOperation{walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				&EvalGetProvider{

terraform/transform_orphan.go

@@ -263,7 +263,7 @@ func (n *graphNodeOrphanResource) EvalTree() EvalNode {
 	// Apply
 	var err error
 	seq.Nodes = append(seq.Nodes, &EvalOpFilter{
-		Ops: []walkOperation{walkApply},
+		Ops: []walkOperation{walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				&EvalReadDiff{

terraform/transform_output.go

@@ -62,7 +62,7 @@ func (n *graphNodeOrphanOutput) Name() string {
 
 func (n *graphNodeOrphanOutput) EvalTree() EvalNode {
 	return &EvalOpFilter{
-		Ops: []walkOperation{walkApply, walkRefresh},
+		Ops: []walkOperation{walkApply, walkDestroy, walkRefresh},
 		Node: &EvalDeleteOutput{
 			Name: n.OutputName,
 		},
@@ -90,7 +90,7 @@ func (n *graphNodeOrphanOutputFlat) Name() string {
 
 func (n *graphNodeOrphanOutputFlat) EvalTree() EvalNode {
 	return &EvalOpFilter{
-		Ops: []walkOperation{walkApply, walkRefresh},
+		Ops: []walkOperation{walkApply, walkDestroy, walkRefresh},
 		Node: &EvalDeleteOutput{
 			Name: n.OutputName,
 		},

terraform/transform_provider.go

@@ -255,7 +255,7 @@ func (n *graphNodeDisabledProvider) EvalTree() EvalNode {
 	var resourceConfig *ResourceConfig
 
 	return &EvalOpFilter{
-		Ops: []walkOperation{walkInput, walkValidate, walkRefresh, walkPlan, walkApply},
+		Ops: []walkOperation{walkInput, walkValidate, walkRefresh, walkPlan, walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				&EvalInterpolate{

terraform/transform_resource.go

@@ -369,7 +369,7 @@ func (n *graphNodeExpandedResource) EvalTree() EvalNode {
 	var createNew, tainted bool
 	var createBeforeDestroyEnabled bool
 	seq.Nodes = append(seq.Nodes, &EvalOpFilter{
-		Ops: []walkOperation{walkApply},
+		Ops: []walkOperation{walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				// Get the saved diff for apply
@@ -591,7 +591,7 @@ func (n *graphNodeExpandedResourceDestroy) EvalTree() EvalNode {
 	var state *InstanceState
 	var err error
 	return &EvalOpFilter{
-		Ops: []walkOperation{walkApply},
+		Ops: []walkOperation{walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				// Get the saved diff for apply

terraform/transform_tainted.go

@@ -114,7 +114,7 @@ func (n *graphNodeTaintedResource) EvalTree() EvalNode {
 	// Apply
 	var diff *InstanceDiff
 	seq.Nodes = append(seq.Nodes, &EvalOpFilter{
-		Ops: []walkOperation{walkApply},
+		Ops: []walkOperation{walkApply, walkDestroy},
 		Node: &EvalSequence{
 			Nodes: []EvalNode{
 				&EvalGetProvider{

terraform/walkoperation_string.go

@@ -4,9 +4,9 @@ package terraform
 
 import "fmt"
 
-const _walkOperation_name = "walkInvalidwalkInputwalkApplywalkPlanwalkPlanDestroywalkRefreshwalkValidate"
+const _walkOperation_name = "walkInvalidwalkInputwalkApplywalkPlanwalkPlanDestroywalkRefreshwalkValidatewalkDestroy"
 
-var _walkOperation_index = [...]uint8{0, 11, 20, 29, 37, 52, 63, 75}
+var _walkOperation_index = [...]uint8{0, 11, 20, 29, 37, 52, 63, 75, 86}
 
 func (i walkOperation) String() string {
 	if i >= walkOperation(len(_walkOperation_index)-1) {