command/destroy: first steps

command/apply.go

@@ -17,6 +17,11 @@ import (
 type ApplyCommand struct {
 	Meta
 
+	// If true, then this apply command will become the "destroy"
+	// command. It is just like apply but only processes a destroy.
+	Destroy bool
+
+	// When this channel is closed, the apply will be cancelled.
 	ShutdownCh <-chan struct{}
 }
 
@@ -26,7 +31,12 @@ func (c *ApplyCommand) Run(args []string) int {
 
 	args = c.Meta.process(args, true)
 
-	cmdFlags := c.Meta.flagSet("apply")
+	cmdName := "apply"
+	if c.Destroy {
+		cmdName = "destroy"
+	}
+
+	cmdFlags := c.Meta.flagSet(cmdName)
 	cmdFlags.BoolVar(&refresh, "refresh", true, "refresh")
 	cmdFlags.StringVar(&statePath, "state", DefaultStateFilename, "path")
 	cmdFlags.StringVar(&stateOutPath, "state-out", "", "path")
@@ -70,6 +80,7 @@ func (c *ApplyCommand) Run(args []string) int {
 		backupPath = stateOutPath + DefaultBackupExtention
 	}
 
+	if !c.Destroy {
 		// Do a detect to determine if we need to do an init + apply.
 		if detected, err := module.Detect(configPath, pwd); err != nil {
 			c.Ui.Error(fmt.Sprintf(
@@ -87,6 +98,7 @@ func (c *ApplyCommand) Run(args []string) int {
 			// Change the config path to be the cwd
 			configPath = pwd
 		}
+	}
 
 	// Build the context based on the arguments given
 	ctx, planned, err := c.Context(contextOpts{
@@ -97,6 +109,11 @@ func (c *ApplyCommand) Run(args []string) int {
 		c.Ui.Error(err.Error())
 		return 1
 	}
+	if planned {
+		c.Ui.Error(fmt.Sprintf(
+			"Destroy can't be called with a plan file."))
+		return 1
+	}
 	if c.Input() {
 		if err := ctx.Input(); err != nil {
 			c.Ui.Error(fmt.Sprintf("Error configuring: %s", err))
@@ -130,7 +147,12 @@ func (c *ApplyCommand) Run(args []string) int {
 			}
 		}
 
-		if _, err := ctx.Plan(nil); err != nil {
+		var opts terraform.PlanOpts
+		if c.Destroy {
+			opts.Destroy = true
+		}
+
+		if _, err := ctx.Plan(&opts); err != nil {
 			c.Ui.Error(fmt.Sprintf(
 				"Error creating plan: %s", err))
 			return 1

command/apply_destroy_test.go

@@ -0,0 +1,120 @@
+package command
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/hashicorp/terraform/terraform"
+	"github.com/mitchellh/cli"
+)
+
+func TestApply_destroy(t *testing.T) {
+	originalState := &terraform.State{
+		Modules: []*terraform.ModuleState{
+			&terraform.ModuleState{
+				Path: []string{"root"},
+				Resources: map[string]*terraform.ResourceState{
+					"test_instance.foo": &terraform.ResourceState{
+						Type: "test_instance",
+						Primary: &terraform.InstanceState{
+							ID: "bar",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	statePath := testStateFile(t, originalState)
+
+	p := testProvider()
+	ui := new(cli.MockUi)
+	c := &ApplyCommand{
+		Destroy: true,
+		Meta: Meta{
+			ContextOpts: testCtxConfig(p),
+			Ui:          ui,
+		},
+	}
+
+	// Run the apply command pointing to our existing state
+	args := []string{
+		"-state", statePath,
+		testFixturePath("apply"),
+	}
+	if code := c.Run(args); code != 0 {
+		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
+	}
+
+	// Verify a new state exists
+	if _, err := os.Stat(statePath); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	f, err := os.Open(statePath)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	defer f.Close()
+
+	state, err := terraform.ReadState(f)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	if state == nil {
+		t.Fatal("state should not be nil")
+	}
+
+	actualStr := strings.TrimSpace(state.String())
+	expectedStr := strings.TrimSpace(testApplyDestroyStr)
+	if actualStr != expectedStr {
+		t.Fatalf("bad:\n\n%s\n\n%s", actualStr, expectedStr)
+	}
+
+	// Should have a backup file
+	f, err = os.Open(statePath + DefaultBackupExtention)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	backupState, err := terraform.ReadState(f)
+	f.Close()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actualStr = strings.TrimSpace(backupState.String())
+	expectedStr = strings.TrimSpace(originalState.String())
+	if actualStr != expectedStr {
+		t.Fatalf("bad:\n\n%s\n\n%s", actualStr, expectedStr)
+	}
+}
+
+func TestApply_destroyPlan(t *testing.T) {
+	planPath := testPlanFile(t, &terraform.Plan{
+		Module: testModule(t, "apply"),
+	})
+
+	p := testProvider()
+	ui := new(cli.MockUi)
+	c := &ApplyCommand{
+		Destroy: true,
+		Meta: Meta{
+			ContextOpts: testCtxConfig(p),
+			Ui:          ui,
+		},
+	}
+
+	// Run the apply command pointing to our existing state
+	args := []string{
+		planPath,
+	}
+	if code := c.Run(args); code != 1 {
+		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
+	}
+}
+
+const testApplyDestroyStr = `
+<no state>
+`