From 35998225dbf22660528113a4ddb9361ea94a84d4 Mon Sep 17 00:00:00 2001
From: Radek Simko <radek.simko@gmail.com>
Date: Sun, 13 Mar 2016 12:16:39 +0000
Subject: [PATCH] provider/aws: Handle deleted CloudFormation stack during
 creation gracefully

---
 .../aws/resource_aws_cloudformation_stack.go  | 53 ++++++++++++++++++-
 1 file changed, 51 insertions(+), 2 deletions(-)

diff --git a/builtin/providers/aws/resource_aws_cloudformation_stack.go b/builtin/providers/aws/resource_aws_cloudformation_stack.go
index 7ce22e48470d..e4d3d6090a88 100644
--- a/builtin/providers/aws/resource_aws_cloudformation_stack.go
+++ b/builtin/providers/aws/resource_aws_cloudformation_stack.go
@@ -145,16 +145,46 @@ func resourceAwsCloudFormationStackCreate(d *schema.ResourceData, meta interface
 	}
 
 	d.SetId(*resp.StackId)
+	creationTime := time.Now()
+	var deletionReasons []string
 
 	wait := resource.StateChangeConf{
-		Pending:    []string{"CREATE_IN_PROGRESS", "ROLLBACK_IN_PROGRESS", "ROLLBACK_COMPLETE"},
+		Pending: []string{
+			"CREATE_IN_PROGRESS",
+			"DELETE_IN_PROGRESS",
+			"DELETE_COMPLETE",
+			"ROLLBACK_IN_PROGRESS",
+			"ROLLBACK_COMPLETE",
+		},
 		Target:     []string{"CREATE_COMPLETE"},
 		Timeout:    time.Duration(retryTimeout) * time.Minute,
-		MinTimeout: 5 * time.Second,
+		MinTimeout: 1 * time.Second,
 		Refresh: func() (interface{}, string, error) {
 			resp, err := conn.DescribeStacks(&cloudformation.DescribeStacksInput{
 				StackName: aws.String(d.Get("name").(string)),
 			})
+			if len(resp.Stacks) == 0 {
+				if d.Get("on_failure").(string) == "DELETE" {
+					log.Printf("[DEBUG] Deleting CloudFormation stack %q (%q) because creation failed: %q",
+						d.Get("name").(string), d.Id(), deletionReasons)
+					d.SetId("")
+					return resp, "", fmt.Errorf(
+						"Creation of CloudFormation stack %q failed: %q",
+						d.Get("name").(string), deletionReasons)
+				} else {
+					// This shouldn't happen unless CloudFormation is inconsistent
+					// See https://github.com/hashicorp/terraform/issues/5487
+					log.Printf("[WARN] CloudFormation stack %q (%q) not found.\nresponse: %q\nfailures: %q",
+						d.Get("name").(string), d.Id(), resp, deletionReasons)
+					return resp, "", fmt.Errorf(
+						"CloudFormation stack %q vanished unexpectedly during creation.\n"+
+							"Unless you knowingly manually deleted the stack "+
+							"please report this as bug at https://github.com/hashicorp/terraform/issues\n"+
+							"along with the config & Terraform version & the details below:\n"+
+							"Full API response: %s\nCaptured reasons: %q\n",
+						d.Get("name").(string), resp, deletionReasons)
+				}
+			}
 			status := *resp.Stacks[0].StackStatus
 			log.Printf("[DEBUG] Current CloudFormation stack status: %q", status)
 
@@ -168,6 +198,18 @@ func resourceAwsCloudFormationStackCreate(d *schema.ResourceData, meta interface
 
 				return resp, "", fmt.Errorf("ROLLBACK_COMPLETE:\n%q", failures)
 			}
+
+			// There is a small chance we may not be able to catch this
+			// if stack becomes deleted in between retries
+			if status == "DELETE_IN_PROGRESS" {
+				failures, err := getCloudFormationFailures(aws.String(d.Get("name").(string)), creationTime, conn)
+				if err != nil {
+					return resp, "", fmt.Errorf(
+						"Failed getting details about deletion reasons: %q", err.Error())
+				}
+				deletionReasons = failures
+			}
+
 			return resp, status, err
 		},
 	}
@@ -485,3 +527,10 @@ func cfStackEventIsFailure(event *cloudformation.StackEvent, afterTime time.Time
 	return failRe.MatchString(*event.ResourceStatus) || rollbackRe.MatchString(*event.ResourceStatus) &&
 		event.Timestamp.After(afterTime) && event.ResourceStatusReason != nil
 }
+
+func cfStackEventIsStackDeletion(event *cloudformation.StackEvent, afterTime time.Time) bool {
+	return *event.ResourceStatus == "DELETE_IN_PROGRESS" &&
+		*event.ResourceType == "AWS::CloudFormation::Stack" &&
+		event.Timestamp.After(afterTime) &&
+		event.ResourceStatusReason != nil
+}