Add prompt when a pipeline recreation happens (#1672)

## Changes
DLT pipeline recreations are destructive. They can lead to lost history
of previous updates, outage of the tables temporarily and are
potentially computationally expensive. Thus we make a breaking change
where a prompt is shown to the user if there configuration changes will
lead to a DLT recreation.

Users can skip the prompt by specifying  the `--auto-approve` flag.

This PR also fixes an issue with our test runner where logs from the
cmdio.Logger would not get propagated to the reader returned by our
cobra test runner.

## Tests
Manually, and new unit and integration tests.

```
➜  bundle-playground-3 cli bundle deploy
Uploading bundle files to /Users/63ec021d-b0c6-49c0-93a0-5123953a1cb2/.bundle/test/development/files...
The following DLT pipelines will be recreated. Underlying tables will be unavailable for a transient period until the newly recreated pipelines are run once successfully. History of previous pipeline update runs will be lost because of recreation:
  recreate pipeline foo

Would you like to proceed? [y/n]: n
Deployment cancelled!
```

bundle/phases/deploy.go

@@ -19,55 +19,95 @@ import (
 	"github.com/databricks/cli/bundle/scripts"
 	"github.com/databricks/cli/libs/cmdio"
 	terraformlib "github.com/databricks/cli/libs/terraform"
+	tfjson "github.com/hashicorp/terraform-json"
 )
 
-func approvalForUcSchemaDelete(ctx context.Context, b *bundle.Bundle) (bool, error) {
-	tf := b.Terraform
-	if tf == nil {
-		return false, fmt.Errorf("terraform not initialized")
-	}
-
-	// read plan file
-	plan, err := tf.ShowPlanFile(ctx, b.Plan.Path)
-	if err != nil {
-		return false, err
-	}
-
-	actions := make([]terraformlib.Action, 0)
-	for _, rc := range plan.ResourceChanges {
-		// We only care about destructive actions on UC schema resources.
-		if rc.Type != "databricks_schema" {
+func parseTerraformActions(changes []*tfjson.ResourceChange, toInclude func(typ string, actions tfjson.Actions) bool) []terraformlib.Action {
+	res := make([]terraformlib.Action, 0)
+	for _, rc := range changes {
+		if !toInclude(rc.Type, rc.Change.Actions) {
 			continue
 		}
 
 		var actionType terraformlib.ActionType
-
 		switch {
 		case rc.Change.Actions.Delete():
 			actionType = terraformlib.ActionTypeDelete
 		case rc.Change.Actions.Replace():
 			actionType = terraformlib.ActionTypeRecreate
 		default:
-			// We don't need a prompt for non-destructive actions like creating
-			// or updating a schema.
+			// No use case for other action types yet.
 			continue
 		}
 
-		actions = append(actions, terraformlib.Action{
+		res = append(res, terraformlib.Action{
 			Action:       actionType,
 			ResourceType: rc.Type,
 			ResourceName: rc.Name,
 		})
 	}
 
-	// No restricted actions planned. No need for approval.
-	if len(actions) == 0 {
+	return res
+}
+
+func approvalForDeploy(ctx context.Context, b *bundle.Bundle) (bool, error) {
+	tf := b.Terraform
+	if tf == nil {
+		return false, fmt.Errorf("terraform not initialized")
+	}
+
+	// read plan file
+	plan, err := tf.ShowPlanFile(ctx, b.Plan.Path)
+	if err != nil {
+		return false, err
+	}
+
+	schemaActions := parseTerraformActions(plan.ResourceChanges, func(typ string, actions tfjson.Actions) bool {
+		// Filter in only UC schema resources.
+		if typ != "databricks_schema" {
+			return false
+		}
+
+		// We only display prompts for destructive actions like deleting or
+		// recreating a schema.
+		return actions.Delete() || actions.Replace()
+	})
+
+	dltActions := parseTerraformActions(plan.ResourceChanges, func(typ string, actions tfjson.Actions) bool {
+		// Filter in only DLT pipeline resources.
+		if typ != "databricks_pipeline" {
+			return false
+		}
+
+		// Recreating DLT pipeline leads to metadata loss and for a transient period
+		// the underling tables will be unavailable.
+		return actions.Replace() || actions.Delete()
+	})
+
+	// We don't need to display any prompts in this case.
+	if len(dltActions) == 0 && len(schemaActions) == 0 {
 		return true, nil
 	}
 
-	cmdio.LogString(ctx, "The following UC schemas will be deleted or recreated. Any underlying data may be lost:")
-	for _, action := range actions {
-		cmdio.Log(ctx, action)
+	// One or more UC schema resources will be deleted or recreated.
+	if len(schemaActions) != 0 {
+		cmdio.LogString(ctx, "The following UC schemas will be deleted or recreated. Any underlying data may be lost:")
+		for _, action := range schemaActions {
+			cmdio.Log(ctx, action)
+		}
+	}
+
+	// One or more DLT pipelines is being recreated.
+	if len(dltActions) != 0 {
+		msg := `
+This action will result in the deletion or recreation of the following DLT Pipelines along with the
+Streaming Tables (STs) and Materialized Views (MVs) managed by them. Recreating the Pipelines will
+restore the defined STs and MVs through full refresh. Note that recreation is necessary when pipeline
+properties such as the 'catalog' or 'storage' are changed:`
+		cmdio.LogString(ctx, msg)
+		for _, action := range dltActions {
+			cmdio.Log(ctx, action)
+		}
 	}
 
 	if b.AutoApprove {
@@ -126,7 +166,7 @@ func Deploy() bundle.Mutator {
 				terraform.CheckRunningResource(),
 				terraform.Plan(terraform.PlanGoal("deploy")),
 				bundle.If(
-					approvalForUcSchemaDelete,
+					approvalForDeploy,
 					deployCore,
 					bundle.LogString("Deployment cancelled!"),
 				),

bundle/phases/deploy_test.go

@@ -0,0 +1,67 @@
+package phases
+
+import (
+	"testing"
+
+	terraformlib "github.com/databricks/cli/libs/terraform"
+	tfjson "github.com/hashicorp/terraform-json"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParseTerraformActions(t *testing.T) {
+	changes := []*tfjson.ResourceChange{
+		{
+			Type: "databricks_pipeline",
+			Change: &tfjson.Change{
+				Actions: tfjson.Actions{tfjson.ActionCreate},
+			},
+			Name: "create pipeline",
+		},
+		{
+			Type: "databricks_pipeline",
+			Change: &tfjson.Change{
+				Actions: tfjson.Actions{tfjson.ActionDelete},
+			},
+			Name: "delete pipeline",
+		},
+		{
+			Type: "databricks_pipeline",
+			Change: &tfjson.Change{
+				Actions: tfjson.Actions{tfjson.ActionDelete, tfjson.ActionCreate},
+			},
+			Name: "recreate pipeline",
+		},
+		{
+			Type: "databricks_whatever",
+			Change: &tfjson.Change{
+				Actions: tfjson.Actions{tfjson.ActionDelete, tfjson.ActionCreate},
+			},
+			Name: "recreate whatever",
+		},
+	}
+
+	res := parseTerraformActions(changes, func(typ string, actions tfjson.Actions) bool {
+		if typ != "databricks_pipeline" {
+			return false
+		}
+
+		if actions.Delete() || actions.Replace() {
+			return true
+		}
+
+		return false
+	})
+
+	assert.Equal(t, []terraformlib.Action{
+		{
+			Action:       terraformlib.ActionTypeDelete,
+			ResourceType: "databricks_pipeline",
+			ResourceName: "delete pipeline",
+		},
+		{
+			Action:       terraformlib.ActionTypeRecreate,
+			ResourceType: "databricks_pipeline",
+			ResourceName: "recreate pipeline",
+		},
+	}, res)
+}

internal/bundle/bundles/recreate_pipeline/databricks_template_schema.json

@@ -0,0 +1,8 @@
+{
+    "properties": {
+        "unique_id": {
+            "type": "string",
+            "description": "Unique ID for the schema and pipeline names"
+        }
+    }
+}

internal/bundle/bundles/recreate_pipeline/template/databricks.yml.tmpl

@@ -0,0 +1,25 @@
+bundle:
+  name: "bundle-playground"
+
+variables:
+  catalog:
+    description: The catalog the DLT pipeline should use.
+    default: main
+
+
+resources:
+  pipelines:
+    foo:
+      name: test-pipeline-{{.unique_id}}
+      libraries:
+        - notebook:
+            path: ./nb.sql
+      development: true
+      catalog: ${var.catalog}
+
+include:
+  - "*.yml"
+
+targets:
+  development:
+    default: true

internal/bundle/bundles/recreate_pipeline/template/nb.sql

@@ -0,0 +1,2 @@
+-- Databricks notebook source
+select 1

internal/bundle/deploy_test.go

@@ -120,8 +120,97 @@ func TestAccBundleDeployUcSchemaFailsWithoutAutoApprove(t *testing.T) {
 	t.Setenv("BUNDLE_ROOT", bundleRoot)
 	t.Setenv("TERM", "dumb")
 	c := internal.NewCobraTestRunnerWithContext(t, ctx, "bundle", "deploy", "--force-lock")
-	stdout, _, err := c.Run()
+	stdout, stderr, err := c.Run()
+
+	assert.EqualError(t, err, root.ErrAlreadyPrinted.Error())
+	assert.Contains(t, stderr.String(), "The following UC schemas will be deleted or recreated. Any underlying data may be lost:\n  delete schema bar")
+	assert.Contains(t, stdout.String(), "the deployment requires destructive actions, but current console does not support prompting. Please specify --auto-approve if you would like to skip prompts and proceed")
+}
+
+func TestAccBundlePipelineDeleteWithoutAutoApprove(t *testing.T) {
+	ctx, wt := acc.WorkspaceTest(t)
+	w := wt.W
+
+	nodeTypeId := internal.GetNodeTypeId(env.Get(ctx, "CLOUD_ENV"))
+	uniqueId := uuid.New().String()
+	bundleRoot, err := initTestTemplate(t, ctx, "deploy_then_remove_resources", map[string]any{
+		"unique_id":     uniqueId,
+		"node_type_id":  nodeTypeId,
+		"spark_version": defaultSparkVersion,
+	})
+	require.NoError(t, err)
+
+	// deploy pipeline
+	err = deployBundle(t, ctx, bundleRoot)
+	require.NoError(t, err)
+
+	// assert pipeline is created
+	pipelineName := "test-bundle-pipeline-" + uniqueId
+	pipeline, err := w.Pipelines.GetByName(ctx, pipelineName)
+	require.NoError(t, err)
+	assert.Equal(t, pipeline.Name, pipelineName)
+
+	// assert job is created
+	jobName := "test-bundle-job-" + uniqueId
+	job, err := w.Jobs.GetBySettingsName(ctx, jobName)
+	require.NoError(t, err)
+	assert.Equal(t, job.Settings.Name, jobName)
+
+	// delete resources.yml
+	err = os.Remove(filepath.Join(bundleRoot, "resources.yml"))
+	require.NoError(t, err)
+
+	// Redeploy the bundle. Expect it to fail because deleting the pipeline requires --auto-approve.
+	t.Setenv("BUNDLE_ROOT", bundleRoot)
+	t.Setenv("TERM", "dumb")
+	c := internal.NewCobraTestRunnerWithContext(t, ctx, "bundle", "deploy", "--force-lock")
+	stdout, stderr, err := c.Run()
+
+	assert.EqualError(t, err, root.ErrAlreadyPrinted.Error())
+	assert.Contains(t, stderr.String(), `This action will result in the deletion or recreation of the following DLT Pipelines along with the
+Streaming Tables (STs) and Materialized Views (MVs) managed by them. Recreating the Pipelines will
+restore the defined STs and MVs through full refresh. Note that recreation is necessary when pipeline
+properties such as the 'catalog' or 'storage' are changed:
+  delete pipeline bar`)
+	assert.Contains(t, stdout.String(), "the deployment requires destructive actions, but current console does not support prompting. Please specify --auto-approve if you would like to skip prompts and proceed")
+
+}
+
+func TestAccBundlePipelineRecreateWithoutAutoApprove(t *testing.T) {
+	ctx, wt := acc.UcWorkspaceTest(t)
+	w := wt.W
+	uniqueId := uuid.New().String()
+
+	bundleRoot, err := initTestTemplate(t, ctx, "recreate_pipeline", map[string]any{
+		"unique_id": uniqueId,
+	})
+	require.NoError(t, err)
+
+	err = deployBundle(t, ctx, bundleRoot)
+	require.NoError(t, err)
+
+	t.Cleanup(func() {
+		destroyBundle(t, ctx, bundleRoot)
+	})
+
+	// Assert the pipeline is created
+	pipelineName := "test-pipeline-" + uniqueId
+	pipeline, err := w.Pipelines.GetByName(ctx, pipelineName)
+	require.NoError(t, err)
+	require.Equal(t, pipelineName, pipeline.Name)
+
+	// Redeploy the bundle, pointing the DLT pipeline to a different UC catalog.
+	t.Setenv("BUNDLE_ROOT", bundleRoot)
+	t.Setenv("TERM", "dumb")
+	c := internal.NewCobraTestRunnerWithContext(t, ctx, "bundle", "deploy", "--force-lock", "--var=\"catalog=whatever\"")
+	stdout, stderr, err := c.Run()
+
 	assert.EqualError(t, err, root.ErrAlreadyPrinted.Error())
+	assert.Contains(t, stderr.String(), `This action will result in the deletion or recreation of the following DLT Pipelines along with the
+Streaming Tables (STs) and Materialized Views (MVs) managed by them. Recreating the Pipelines will
+restore the defined STs and MVs through full refresh. Note that recreation is necessary when pipeline
+properties such as the 'catalog' or 'storage' are changed:
+  recreate pipeline foo`)
 	assert.Contains(t, stdout.String(), "the deployment requires destructive actions, but current console does not support prompting. Please specify --auto-approve if you would like to skip prompts and proceed")
 }