Class: Lono::Cfn::Diff

Inherits:
Base
  • Object
show all
Includes:
AwsServices
Defined in:
lib/lono/cfn/diff.rb

Instance Method Summary collapse

Methods included from AwsServices

#cfn, #ec2, #iam, #s3, #s3_presigner, #s3_resource, #sts

Methods included from AwsServices::Util

#find_stack, #rollback_complete?, #stack_exists?, #testing_update?

Methods inherited from Base

#build_files, #build_scripts, #capabilities, #check_files, #check_for_errors, #command_with_iam, #continue_update_rollback, #continue_update_rollback_sure?, #delete_rollback_stack, #ensure_s3_bucket_exist, #exit_unless_updatable!, #generate_all, #generate_templates, #initialize, #param_generator, #post_process_templates, #pretty_path, #prompt_for_iam, #quit, #set_template_body!, #show_parameters, #stack_status, #starting_message, #status, #tags, #upload_files, #upload_scripts, #upload_templates

Methods included from Util

#are_you_sure?, #switch_current

Methods included from Suffix

#allow_suffix?, #append_suffix, #random_suffix, #remove_suffix, #stack_name_suffix

Methods included from Lono::Conventions

#template_param_convention

Methods included from Blueprint::Root

#bundler_groups, #find_blueprint_root, #require_bundle_gems, #set_blueprint_root

Constructor Details

This class inherits a constructor from Lono::Cfn::Base

Instance Method Details

#diff_viewer ⇒ Object 



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# File 'lib/lono/cfn/diff.rb', line 41

def diff_viewer
  return ENV['LONO_DIFF'] if ENV['LONO_DIFF']
  system("type colordiff > /dev/null") ? "colordiff" : "diff"
end

#download_existing_cfn_template ⇒ Object 



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# File 'lib/lono/cfn/diff.rb', line 21

def download_existing_cfn_template
  resp = cfn.get_template(
    stack_name: @stack_name,
    template_stage: "Original"
  )
  resp.template_body
  IO.write(existing_template_path, resp.template_body)
end

#existing_template_path ⇒ Object 



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# File 'lib/lono/cfn/diff.rb', line 46

def existing_template_path
  "/tmp/existing_cfn_template.yml"
end

#new_cfn_template ⇒ Object

for clarity



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# File 'lib/lono/cfn/diff.rb', line 37

def new_cfn_template
  @template_path
end

#run ⇒ Object 



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# File 'lib/lono/cfn/diff.rb', line 5

def run
  unless stack_exists?(@stack_name)
    puts "WARN: Cannot create a diff for the stack because the #{@stack_name} does not exists.".color(:yellow)
    return
  end

  if @options[:noop]
    puts "NOOP Generating CloudFormation source code diff..."
  else
    generate_all # from Base superclass. Generates the output lono teplates
    puts "Generating CloudFormation source code diff..."
    download_existing_cfn_template
    show_changes
  end
end

#show_changes ⇒ Object 



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# File 'lib/lono/cfn/diff.rb', line 30

def show_changes
  command = "#{diff_viewer} #{existing_template_path} #{new_cfn_template}"
  puts "Running: #{command}"
  system(command)
end