Class: ChangesetUtil

Inherits:
Object
  • Object
show all
Defined in:
lib/changeset_util.rb

Instance Method Summary collapse

Instance Method Details

#changes_that_modify_or_remove(stack_name:, template_body:, parameters: []) ⇒ Object

hmmmm how to handle parameters? if it uses the previous value…?



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# File 'lib/changeset_util.rb', line 28

def changes_that_modify_or_remove(stack_name:,
                                  template_body:,
                                  parameters: [])

  change_set_name = "changeSet#{Time.now.to_i}"
  client_token = "clientToken#{Time.now.to_i}"

  create_change_set_response = cloudformation_client.create_change_set stack_name: stack_name,
                                                                       template_body: template_body,
                                                                       capabilities: %w(CAPABILITY_IAM),
                                                                       change_set_name: change_set_name,
                                                                       client_token: client_token,
                                                                       parameters: convert_parameters(parameters)

  change_set_id = create_change_set_response.id

  describe_change_set_response = describe_change_set change_set_id: change_set_id

  STDERR.puts describe_change_set_response.changes
  describe_change_set_response.changes.select { |change| %w(Modify Remove).include? change.resource_change.action }
end

#immutable_resources_that_would_change(stack_name:, template_body:) ⇒ Object 



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# File 'lib/changeset_util.rb', line 6

def immutable_resources_that_would_change(stack_name:,
                                          template_body:)

  potentially_unsafe_changes = changes_that_modify_or_remove stack_name: stack_name,
                                                             template_body: template_body

  logical_resource_ids = potentially_unsafe_changes.map { |change| change.resource_change.logical_resource_id }

  logical_resource_ids.each do |logical_resource_id|
    tags = CloudFormationTagParser.new.tags cloudformation_json: template_body,
                                            logical_resource_id: logical_resource_id
    if tags.find { |tag| tag['Key'] == 'immutable' and tag['Value'] == 'true' }
      return logical_resource_id
    end
  end
  nil
end