fix: handel update stack error (#42)

* fix: handel update stack error

* fix: handel error to codebuild

Author: yanbasic

src/emd/cfn/codepipeline/template.yaml

@@ -50,6 +50,7 @@ Resources:
                   - cloudformation:DescribeStacks
                   - cloudformation:CreateStack
                   - cloudformation:DeleteStack
+                  - cloudformation:UpdateStack
                   - ec2:*
                   - ecs:*
                   - iam:CreateRole

src/emd/cfn/ecs/post_build.py

@@ -3,6 +3,7 @@
 import json
 import os
 import argparse
+import sys
 from emd.models.utils.serialize_utils import load_extra_params
 
 # Post build script for ECS, it will deploy the VPC and ECS cluster.
@@ -26,10 +27,10 @@ def wait_for_stack_completion(client, stack_name):
             print(f"Stack {stack_name} deployment complete")
             break
         else:
-            raise Exception(
+            print(
                 f"Post build stage failed. The stack {stack_name} is in an unexpected status: {stack_status}. Please visit the AWS CloudFormation Console to delete the stack."
             )
-
+            sys.exit(1)
 
 def get_stack_outputs(client, stack_name):
     response = client.describe_stacks(StackName=stack_name)
@@ -47,12 +48,15 @@ def create_or_update_stack(client, stack_name, template_path, parameters=[]):
             with open(template_path, "r") as template_file:
                 template_body = template_file.read()
 
-            response = client.update_stack(
-                StackName=stack_name,
-                TemplateBody=template_body,
-                Capabilities=["CAPABILITY_NAMED_IAM"],
-                Parameters=parameters
-            )
+            try:
+                response = client.update_stack(
+                    StackName=stack_name,
+                    TemplateBody=template_body,
+                    Capabilities=["CAPABILITY_NAMED_IAM"],
+                    Parameters=parameters
+                )
+            except Exception as e:
+                print(f"No updates are to be performed for stack {stack_name}.")
 
             print(f"Started update of stack {stack_name}")
             wait_for_stack_completion(client, stack_name)
@@ -75,9 +79,10 @@ def create_or_update_stack(client, stack_name, template_path, parameters=[]):
             print(f"Started deployment of stack {stack_name} with ID {stack_id}")
             wait_for_stack_completion(client, stack_name)
         else:
-            raise Exception(
+            print(
                 f"Post build stage failed. The stack {stack_name} is in an unexpected status: {stack_status}. Please visit the AWS CloudFormation Console to delete the stack."
             )
+            sys.exit(1)
 
 
 def update_parameters_file(parameters_path, updates):