Class: YleTf::Action::TerraformInit

Inherits:
Object
  • Object
show all
Defined in:
lib/yle_tf/action/terraform_init.rb

Constant Summary collapse

TF_CMD_ARGS = 
%w[-input=false -no-color].freeze
TF_CMD_OPTS = 
{
  env:    { 'TF_IN_AUTOMATION' => 'true' }, # Reduces some output
  stdout: :debug                            # Hide the output to the debug level
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ TerraformInit

Returns a new instance of TerraformInit.



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# File 'lib/yle_tf/action/terraform_init.rb', line 23

def initialize(app)
  @app = app
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/yle_tf/action/terraform_init.rb', line 21

def config
  @config
end

Instance Method Details

#backend ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 72

def backend
  @backend ||= find_backend
end

#call(env) ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 27

def call(env)
  @config = env[:config]

  Logger.info('Initializing Terraform')
  Logger.debug("Backend configuration: #{backend}")

  init_dir

  if env[:tf_command] == 'init'
    # Skip initializing Terraform here, as it will be done by the
    # actuall command later in the middleware stack.
    @app.call(env)
    store_terraform_lock
  else
    init_terraform
    store_terraform_lock
    @app.call(env)
  end

  tear_down
end

#copy_to_module_dir(file) ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 98

def copy_to_module_dir(file)
  FileUtils.cp(file, config.module_dir.to_s) if File.exist?(file)
end

#find_backend ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 80

def find_backend
  backend_type = config.fetch('backend', 'type').downcase
  backend_proc = Plugin.manager.backends[backend_type]

  klass = backend_proc.call
  klass.new(config)
end

#init_dir ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 49

def init_dir
  Logger.debug('Configuring the backend')
  backend.configure

  Logger.debug('Symlinking errored.tfstate')
  symlink_to_module_dir('errored.tfstate')
end

#init_terraform ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 62

def init_terraform
  Logger.debug('Initializing Terraform')
  YleTf::System.cmd('terraform', 'init', *tf_init_args, **TF_CMD_OPTS)
end

#store_terraform_lock ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 67

def store_terraform_lock
  Logger.debug('Storing .terraform.lock.hcl')
  copy_to_module_dir('.terraform.lock.hcl')
end

#symlink_to_module_dir(file) ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 88

def symlink_to_module_dir(file)
  local_path = Pathname.pwd.join(file)
  remote_path = config.module_dir.join(file)

  # Remove the possibly copied old file
  local_path.unlink if local_path.exist?

  local_path.make_symlink(remote_path)
end

#tear_down ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 57

def tear_down
  Logger.debug('Tearing down backend')
  backend.tear_down
end

#tf_init_args ⇒ Object 



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# File 'lib/yle_tf/action/terraform_init.rb', line 76

def tf_init_args
  TF_CMD_ARGS + Shellwords.split(ENV.fetch('TF_INIT_ARGS', ''))
end