cfn-lint

import subprocess import os # Create a dummy CloudFormation template file with an intentional error template_content = """ AWSTemplateFormatVersion: '2010-09-09' Resources: MyS3Bucket: Type: AWS::S3::Bucket Properties: BucketName: my-unique-bucket-name # Intentional error: 'InvalidProperty' is not a valid S3 Bucket property InvalidProperty: true """ template_file = "./my_bad_template.yaml" with open(template_file, "w") as f: f.write(template_content) print(f"Linting {template_file} with cfn-lint...") try: # Run cfn-lint as a subprocess # --format text is default, but explicit for clarity # --non-zero-exit-code error ensures a non-zero exit if errors are found result = subprocess.run( ['cfn-lint', template_file, '--non-zero-exit-code', 'error'], capture_output=True, text=True, check=False ) print("\n--- cfn-lint Output ---") print(result.stdout) if result.stderr: print("\n--- cfn-lint Errors ---") print(result.stderr) if result.returncode != 0: print(f"\ncfn-lint found issues! Exit Code: {result.returncode}") else: print("\ncfn-lint found no issues.") except FileNotFoundError: print("Error: cfn-lint command not found. Please ensure it's installed and in your PATH.") except Exception as e: print(f"An unexpected error occurred: {e}") finally: # Clean up the dummy template file if os.path.exists(template_file): os.remove(template_file) print(f"\nCleaned up {template_file}")