module Lono::AwsServices::Stack
Public Instance Methods
find_stack(stack_name)
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# File lib/lono/aws_services/stack.rb, line 29 def find_stack(stack_name) resp = cfn.describe_stacks(stack_name: stack_name) resp.stacks.first rescue Aws::CloudFormation::Errors::ValidationError => e # example: Stack with id demo-web does not exist if e.message =~ /Stack with/ && e.message =~ /does not exist/ nil else raise end end
stack_exists?(stack_name)
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# File lib/lono/aws_services/stack.rb, line 3 def stack_exists?(stack_name) return true if testing_update? return false if @options[:noop] exist = nil begin # When the stack does not exist an exception is raised. Example: # Aws::CloudFormation::Errors::ValidationError: Stack with id blah does not exist cfn.describe_stacks(stack_name: stack_name) exist = true rescue Aws::CloudFormation::Errors::ValidationError => e if e.message =~ /does not exist/ exist = false elsif e.message.include?("'stackName' failed to satisfy constraint") # Example of e.message when describe_stack with invalid stack name # "1 validation error detected: Value 'instance_and_route53' at 'stackName' failed to satisfy constraint: Member must satisfy regular expression pattern: [a-zA-Z][-a-zA-Z0-9]*|arn:[-a-zA-Z0-9:/._+]*" puts "Invalid stack name: #{stack_name}" puts "Full error message: #{e.message}" exit 1 else raise # re-raise exception because unsure what other errors can happen end end exist end