Class: Kitchen::Driver::Ec2

Inherits:
Base
  • Object
show all
Defined in:
lib/kitchen/driver/ec2.rb

Overview

Amazon EC2 driver for Test Kitchen.

Author:

Constant Summary collapse

INTERFACE_TYPES =

Ordered mapping from config name to Fog name. Ordered by preference when looking up hostname.

{
  "dns" => "public_dns_name",
  "public" => "public_ip_address",
  "private" => "private_ip_address",
  "private_dns" => "private_dns_name",
  "id" => "id",
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, &block) ⇒ Ec2

Returns a new instance of Ec2.



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# File 'lib/kitchen/driver/ec2.rb', line 93

def initialize(*args, &block)
  super
end

Class Method Details

.validation_error(driver, old_key, new_key) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 102

def self.validation_error(driver, old_key, new_key)
  warn "ERROR: The driver[#{driver.class.name}] config key `#{old_key}` " \
    "has been removed, please use `#{new_key}`"
  exit!
end

.validation_warn(driver, old_key, new_key) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 97

def self.validation_warn(driver, old_key, new_key)
  driver.warn "WARN: The driver[#{driver.class.name}] config key `#{old_key}` " \
    "is deprecated, please use `#{new_key}`"
end

Instance Method Details

#actual_platform ⇒ Object

The actual platform is the platform detected from the image



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# File 'lib/kitchen/driver/ec2.rb', line 334

def actual_platform
  @actual_platform ||= Aws::StandardPlatform.from_image(self, image) if image
end

#attach_network_interface(state) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 828

def attach_network_interface(state)
  info("Attaching Network interface <#{config[:elastic_network_interface_id]}> with the instance <#{state[:server_id]}> .")
  client = ::Aws::EC2::Client.new(region: config[:region])
  begin
    check_eni = client.describe_network_interface_attribute({
      attribute: "attachment",
      network_interface_id: config[:elastic_network_interface_id],
    })
    if check_eni.attachment.nil?
      unless state[:server_id].nil?
        client.attach_network_interface({
        device_index: 1,
        instance_id: state[:server_id],
        network_interface_id: config[:elastic_network_interface_id],
        })
        info("Attached Network interface <#{config[:elastic_network_interface_id]}> with the instance <#{state[:server_id]}> .")
      end
    else
      puts "ENI #{config[:elastic_network_interface_id]} already attached."
    end
  rescue ::Aws::EC2::Errors::InvalidNetworkInterfaceIDNotFound => e
    warn("#{e}")
  end
end

#config ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 398

def config
  return super unless @config

  @config
end

#create(state) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 197

def create(state)
  return if state[:server_id]

  update_username(state)

  info(Kitchen::Util.outdent!(<<-END)) unless config[:skip_cost_warning]
    If you are not using an account that qualifies under the AWS
    free-tier, you may be charged to run these suites. The charge
    should be minimal, but neither Test Kitchen nor its maintainers
    are responsible for your incurred costs.
  END

  # If no security group IDs are specified, create one automatically.
  unless config[:security_group_ids] || config[:security_group_filter]
    create_security_group(state)
    config[:security_group_ids] = [state[:auto_security_group_id]]
  end

  # If no SSH key pair name is specified, create one automatically.
  # If `_disabled`, nullify the key ID to avoid associating the instance with
  # an AWS-managed key pair.
  case config[:aws_ssh_key_id]
  when nil
    create_key(state)
    config[:aws_ssh_key_id] = state[:auto_key_id]
  when "_disable"
    info("Disabling AWS-managed SSH key pairs for this EC2 instance.")
    info("The key pairs for the kitchen transport config and the AMI must match.")
    config[:aws_ssh_key_id] = nil
  end

  if config[:spot_price]
    # Spot instance when a price is set
    server = with_request_limit_backoff(state) { submit_spots }
  else
    # On-demand instance
    server = with_request_limit_backoff(state) { submit_server }
  end
  info("Instance <#{server.id}> requested.")
  with_request_limit_backoff(state) do
    logging_proc = ->(attempts) { info("Polling AWS for existence, attempt #{attempts}...") }
    server.wait_until_exists(before_attempt: logging_proc)
  end

  state[:server_id] = server.id
  info("EC2 instance <#{state[:server_id]}> created.")

  # See https://github.com/aws/aws-sdk-ruby/issues/859
  # Waiting can fail, so we have to retry on that.
  Retryable.retryable(
    tries: 10,
    sleep: lambda { |n| [2**n, 30].min },
    on: ::Aws::EC2::Errors::InvalidInstanceIDNotFound
  ) do |r, _|
    wait_until_ready(server, state)
  end

  if windows_os? &&
      instance.transport[:username] =~ /administrator/i &&
      instance.transport[:password].nil?
    # If we're logging into the administrator user and a password isn't
    # supplied, try to fetch it from the AWS instance
    fetch_windows_admin_password(server, state)
  end

  info("EC2 instance <#{state[:server_id]}> ready (hostname: #{state[:hostname]}).")
  instance.transport.connection(state).wait_until_ready
  attach_network_interface(state) unless config[:elastic_network_interface_id].nil?
  create_ec2_json(state) if /chef/i.match?(instance.provisioner.name)
  debug("ec2:create '#{state[:hostname]}'")
rescue Exception => e
  # Clean up any auto-created security groups or keys on the way out.
  delete_security_group(state)
  delete_key(state)
  raise "#{e.message} in the specified region #{config[:region]}. Please check this AMI is available in this region."
end

#create_ec2_json(state) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 639

def create_ec2_json(state)
  if windows_os?
    cmd = "New-Item -Force C:\\chef\\ohai\\hints\\ec2.json -ItemType File"
  else
    debug "Using sudo_command='#{sudo_command}' for ohai hints"
    cmd = "#{sudo_command} mkdir -p /etc/chef/ohai/hints; #{sudo_command} touch /etc/chef/ohai/hints/ec2.json"
  end
  instance.transport.connection(state).execute(cmd)
end

#create_key(state) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Create a temporary SSH key pair for this instance.

Parameters:

  • state (Hash) —

    Instance state hash.



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# File 'lib/kitchen/driver/ec2.rb', line 798

def create_key(state)
  return if state[:auto_key_id]

  # Encode a bunch of metadata into the name because that's all we can
  # set for a key pair.
  name_parts = [
    instance.name.gsub(/\W/, ""),
    (Etc.getlogin || "nologin").gsub(/\W/, ""),
    Socket.gethostname.gsub(/\W/, "")[0..20],
    Time.now.utc.iso8601,
    Array.new(8) { rand(36).to_s(36) }.join(""),
  ]
  # In a perfect world this would generate the key locally and use ImportKey
  # instead for better security, but given the use case that is very likely
  # to rapidly exhaust local entropy by creating a lot of keys. So this is
  # probably fine. If you want very high security, probably don't use this
  # feature anyway.
  resp = ec2.client.create_key_pair(key_name: "kitchen-#{name_parts.join("-")}")
  state[:auto_key_id] = resp.key_name
  info("Created automatic key pair #{state[:auto_key_id]}")
  # Write the key out with safe permissions
  key_path = "#{config[:kitchen_root]}/.kitchen/#{instance.name}.pem"
  File.open(key_path, File::WRONLY | File::CREAT | File::EXCL, 00600) do |f|
    f.write(resp.key_material)
  end
  # Inject the key into the state to be used by the SSH transport, or for
  # the Windows password decrypt above in {#fetch_windows_admin_password}.
  state[:ssh_key] = key_path
end

#create_security_group(state) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Create a temporary security group for this instance.

Parameters:

  • state (Hash) —

    Instance state hash.



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# File 'lib/kitchen/driver/ec2.rb', line 740

def create_security_group(state)
  return if state[:auto_security_group_id]

  # Work out which VPC, if any, we are creating in.
  vpc_id = if config[:subnet_id]
             # Get the VPC ID for the subnet.
             subnets = ec2.client.describe_subnets(filters: [{ name: "subnet-id", values: [config[:subnet_id]] }]).subnets
             raise "Subnet #{config[:subnet_id]} not found during security group creation" if subnets.empty?

             subnets.first.vpc_id
           elsif config[:subnet_filter]
             subnets = ec2.client.describe_subnets(filters: [{ name: "tag:#{config[:subnet_filter][:tag]}", values: [config[:subnet_filter][:value]] }]).subnets
             raise "Subnets with tag '#{config[:subnet_filter][:tag]}=#{config[:subnet_filter][:value]}' not found during security group creation" if subnets.empty?

             subnets.first.vpc_id
           else
             # Try to check for a default VPC.
             vpcs = ec2.client.describe_vpcs(filters: [{ name: "isDefault", values: ["true"] }]).vpcs
             if vpcs.empty?
               # No default VPC so assume EC2-Classic ¯\_(ツ)_/¯
               nil
             else
               # I don't actually know if you can have more than one default VPC?
               vpcs.first.vpc_id
             end
           end
  # Create the SG.
  params = {
    group_name: "kitchen-#{Array.new(8) { rand(36).to_s(36) }.join}",
    description: "Test Kitchen for #{instance.name} by #{Etc.getlogin || "nologin"} on #{Socket.gethostname}",
  }
  params[:vpc_id] = vpc_id if vpc_id
  resp = ec2.client.create_security_group(params)
  state[:auto_security_group_id] = resp.group_id
  info("Created automatic security group #{state[:auto_security_group_id]}")
  debug("  in VPC #{vpc_id || "none"}")
  # Set up SG rules.
  ec2.client.authorize_security_group_ingress(
    group_id: state[:auto_security_group_id],
    # Allow SSH and WinRM (both plain and TLS).
    ip_permissions: [22, 3389, 5985, 5986].map do |port|
      {
        ip_protocol: "tcp",
        from_port: port,
        to_port: port,
        ip_ranges: Array(config[:security_group_cidr_ip]).map do |cidr_ip|
          { cidr_ip: cidr_ip }
        end,
      }
    end
  )
end

#default_ami ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 349

def default_ami
  @default_ami ||= begin
    search_platform = desired_platform ||
      Aws::StandardPlatform.from_platform_string(self, "ubuntu")
    image_search = config[:image_search] || search_platform.image_search
    search_platform.find_image(image_search)
  end
end

#default_instance_type ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 322

def default_instance_type
  @instance_type ||= if image && image.virtualization_type == "hvm"
                       info("instance_type not specified. Using free tier t2.micro instance ...")
                       "t2.micro"
                     else
                       info("instance_type not specified. Using free tier t1.micro instance since" \
                            " image is paravirtual (pick an hvm image to use the superior t2.micro!) ...")
                       "t1.micro"
                     end
end

#default_windows_user_data ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 649

def default_windows_user_data
  base_script = Kitchen::Util.outdent!(<<-EOH)
	$OSVersion = (get-itemproperty -Path "HKLM:\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion" -Name ProductName).ProductName
  If($OSVersion.contains('2016') -Or $OSVersion.contains('2019') -Or $OSVersion -eq 'Windows Server Datacenter') {
    New-Item -ItemType Directory -Force -Path 'C:\\ProgramData\\Amazon\\EC2-Windows\\Launch\\Log'
    $logfile='C:\\ProgramData\\Amazon\\EC2-Windows\\Launch\\Log\\kitchen-ec2.log'
    # EC2Launch doesn't init extra disks by default
    C:\\ProgramData\\Amazon\\EC2-Windows\\Launch\\Scripts\\InitializeDisks.ps1
  } Else {
     New-Item -ItemType Directory -Force -Path 'C:\\Program Files\\Amazon\\Ec2ConfigService\\Logs'
     $logfile='C:\\Program Files\\Amazon\\Ec2ConfigService\\Logs\\kitchen-ec2.log'
  }

  # Logfile fail-safe in case the directory does not exist
  New-Item $logfile -Type file -Force

  # Allow script execution
  Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Force
  #PS Remoting and & winrm.cmd basic config
  $enableArgs=@{Force=$true}
  $command=Get-Command Enable-PSRemoting
  if($command.Parameters.Keys -contains "skipnetworkprofilecheck"){
      $enableArgs.skipnetworkprofilecheck=$true
  }
  Enable-PSRemoting @enableArgs
  & winrm.cmd set winrm/config '@{MaxTimeoutms="1800000"}' >> $logfile
  & winrm.cmd set winrm/config/winrs '@{MaxMemoryPerShellMB="1024"}' >> $logfile
  & winrm.cmd set winrm/config/winrs '@{MaxShellsPerUser="50"}' >> $logfile
  & winrm.cmd set winrm/config/winrs '@{MaxMemoryPerShellMB="1024"}' >> $logfile
  #Firewall Config
  & netsh advfirewall firewall set rule name="Windows Remote Management (HTTP-In)" profile=public protocol=tcp localport=5985 remoteip=localsubnet new remoteip=any  >> $logfile
  Set-ItemProperty -Name LocalAccountTokenFilterPolicy -Path HKLM:\\software\\Microsoft\\Windows\\CurrentVersion\\Policies\\system -Value 1
  EOH

  # Preparing custom static admin user if we defined something other than Administrator
  custom_admin_script = ""
  if !(instance.transport[:username] =~ /administrator/i) && instance.transport[:password]
    custom_admin_script = Kitchen::Util.outdent!(<<-EOH)
    "Disabling Complex Passwords" >> $logfile
    $seccfg = [IO.Path]::GetTempFileName()
    & secedit.exe /export /cfg $seccfg >> $logfile
    (Get-Content $seccfg) | Foreach-Object {$_ -replace "PasswordComplexity\\s*=\\s*1", "PasswordComplexity = 0"} | Set-Content $seccfg
    & secedit.exe /configure /db $env:windir\\security\\new.sdb /cfg $seccfg /areas SECURITYPOLICY >> $logfile
    & cp $seccfg "c:\\"
    & del $seccfg
    $username="#{instance.transport[:username]}"
    $password="#{instance.transport[:password]}"
    "Creating static user: $username" >> $logfile
    & net.exe user /y /add $username $password >> $logfile
    "Adding $username to Administrators" >> $logfile
    & net.exe localgroup Administrators /add $username >> $logfile
    EOH
  end

  # Returning the fully constructed PowerShell script to user_data
  Kitchen::Util.outdent!(<<-EOH)
  <powershell>
  #{base_script}
  #{custom_admin_script}
  </powershell>
  EOH
end

#delete_key(state) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Clean up a temporary SSH key pair for this instance.

Parameters:

  • state (Hash) —

    Instance state hash.



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# File 'lib/kitchen/driver/ec2.rb', line 871

def delete_key(state)
  return unless state[:auto_key_id]

  info("Removing automatic key pair #{state[:auto_key_id]}")
  ec2.client.delete_key_pair(key_name: state[:auto_key_id])
  state.delete(:auto_key_id)
  File.unlink("#{config[:kitchen_root]}/.kitchen/#{instance.name}.pem")
end

#delete_security_group(state) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Clean up a temporary security group for this instance.

Parameters:

  • state (Hash) —

    Instance state hash.



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# File 'lib/kitchen/driver/ec2.rb', line 858

def delete_security_group(state)
  return unless state[:auto_security_group_id]

  info("Removing automatic security group #{state[:auto_security_group_id]}")
  ec2.client.delete_security_group(group_id: state[:auto_security_group_id])
  state.delete(:auto_security_group_id)
end

#desired_platform ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 338

def desired_platform
  @desired_platform ||= begin
    platform = Aws::StandardPlatform.from_platform_string(self, instance.platform.name)
    if platform
      debug("platform name #{instance.platform.name} appears to be a standard platform." \
            " Searching for #{platform} ...")
    end
    platform
  end
end

#destroy(state) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 274

def destroy(state)
  if state[:server_id]
    server = ec2.get_instance(state[:server_id])
    unless server.nil?
      instance.transport.connection(state).close
      begin
        server.terminate
      rescue ::Aws::EC2::Errors::InvalidInstanceIDNotFound => e
        warn("Received #{e}, instance was probably already destroyed. Ignoring")
      end
    end
    # If we are going to clean up an automatic security group, we need
    # to wait for the instance to shut down. This slightly breaks the
    # subsystem encapsulation, sorry not sorry.
    if state[:auto_security_group_id] && server
      server.wait_until_terminated do |waiter|
        waiter.max_attempts = config[:retryable_tries]
        waiter.delay = config[:retryable_sleep]
        waiter.before_attempt do |attempts|
          info "Waited #{attempts * waiter.delay}/#{waiter.delay * waiter.max_attempts}s for instance <#{server.id}> to terminate."
        end
      end
    end
    info("EC2 instance <#{state[:server_id]}> destroyed.")
    state.delete(:server_id)
    state.delete(:hostname)
  end

  # Clean up any auto-created security groups or keys.
  delete_security_group(state)
  delete_key(state)
end

#ec2 ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 373

def ec2
  @ec2 ||= Aws::Client.new(
    config[:region],
    config[:shared_credentials_profile],
    config[:http_proxy],
    config[:retry_limit],
    config[:ssl_verify_peer]
  )
end

#expand_config(conf, key) ⇒ Object

Take one config and expand to multiple configs



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# File 'lib/kitchen/driver/ec2.rb', line 405

def expand_config(conf, key)
  configs = []

  if conf[key] && conf[key].is_a?(Array)
    values = conf[key]
    values.each do |value|
      new_config = conf.clone
      new_config[key] = value
      configs.push new_config
    end
  else
    configs.push conf
  end

  configs
end

#fetch_windows_admin_password(server, state) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 567

def fetch_windows_admin_password(server, state)
  wait_with_destroy(server, state, "to fetch windows admin password") do |aws_instance|
    enc = server.client.get_password_data(
      instance_id: state[:server_id]
    ).password_data
    # Password data is blank until password is available
    !enc.nil? && !enc.empty?
  end
  pass = with_request_limit_backoff(state) do
    server.decrypt_windows_password(File.expand_path(state[:ssh_key] || instance.transport[:ssh_key]))
  end
  state[:password] = pass
  info("Retrieved Windows password for instance <#{state[:server_id]}>.")
end

#hostname(server, interface_type = nil) ⇒ Object

Lookup hostname of provided server. If interface_type is provided use that interface to lookup hostname. Otherwise, try ordered list of options.



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# File 'lib/kitchen/driver/ec2.rb', line 615

def hostname(server, interface_type = nil)
  if interface_type
    interface_type = INTERFACE_TYPES.fetch(interface_type) do
      raise Kitchen::UserError, "Invalid interface [#{interface_type}]"
    end
    server.send(interface_type)
  else
    potential_hostname = nil
    INTERFACE_TYPES.values.each do |type|
      potential_hostname ||= server.send(type)
      # AWS returns an empty string if the dns name isn't populated yet
      potential_hostname = nil if potential_hostname == ""
    end
    potential_hostname
  end
end

#image ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 307

def image
  return @image if defined?(@image)

  if config[:image_id]
    @image = ec2.resource.image(config[:image_id])
    show_chosen_image

  else
    raise "Neither image_id nor an image_search specified for instance #{instance.name}!" \
          " Please specify one or the other."
  end

  @image
end

#image_info(image) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 724

def image_info(image)
  root_device = image.block_device_mappings
    .find { |b| b.device_name == image.root_device_name }
  volume_type = " #{root_device.ebs.volume_type}" if root_device && root_device.ebs

  " Architecture: #{image.architecture}," \
  " Virtualization: #{image.virtualization_type}," \
  " Storage: #{image.root_device_type}#{volume_type}," \
  " Created: #{image.creation_date}"
end

#instance_generator ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 383

def instance_generator
  @instance_generator = Aws::InstanceGenerator.new(config, ec2, instance.logger)
end

#show_chosen_image ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 712

def show_chosen_image
  # Print some debug stuff
  debug("Image for #{instance.name}: #{image.name}. #{image_info(image)}")
  if actual_platform
    info("Detected platform: #{actual_platform.name} version #{actual_platform.version}" \
         " on #{actual_platform.architecture}. Instance Type: #{config[:instance_type]}." \
         " Default username: #{actual_platform.username} (default).")
  else
    debug("No platform detected for #{image.name}.")
  end
end

#submit_server ⇒ Object

AWS helper for creating the instance



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# File 'lib/kitchen/driver/ec2.rb', line 388

def submit_server
  instance_data = instance_generator.ec2_instance_data
  debug("Creating EC2 instance in region #{config[:region]} with properties:")
  instance_data.each do |key, value|
    debug("- #{key} = #{value.inspect}")
  end

  ec2.create_instance(instance_data)
end

#submit_spot ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 469

def submit_spot
  debug("Creating EC2 Spot Instance..")
  instance_data = instance_generator.ec2_instance_data

  config_spot_price = config[:spot_price].to_s
  if %w{ondemand on-demand}.include?(config_spot_price)
    spot_price = ""
  else
    spot_price = config_spot_price
  end
  spot_options = {
    # Must use one-time in order to use instance_interruption_behavior=terminate
    # spot_instance_type: "one-time", # default
    # Must use instance_interruption_behavior=terminate in order to use block_duration_minutes
    # instance_interruption_behavior: "terminate", # default
  }
  if config[:block_duration_minutes]
    spot_options[:block_duration_minutes] = config[:block_duration_minutes]
  end
  unless spot_price == "" # i.e. on-demand
    spot_options[:max_price] = spot_price
  end

  instance_data[:instance_market_options] = {
    market_type: "spot",
    spot_options: spot_options,
  }

  # The preferred way to create a spot instance is via request_spot_instances()
  # However, it does not allow for tagging to occur at creation time.
  # create_instances() allows creation of tagged spot instances, but does
  # not retry if the price could not be satisfied immediately.
  Retryable.retryable(
    tries: config[:spot_wait] / config[:retryable_sleep],
    sleep: lambda { |_n| config[:retryable_sleep] },
    on: ::Aws::EC2::Errors::SpotMaxPriceTooLow
  ) do |retries|
    c = retries * config[:retryable_sleep]
    t = config[:spot_wait]
    info "Waited #{c}/#{t}s for spot request to become fulfilled."
    ec2.create_instance(instance_data)
  end
end

#submit_spots ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 422

def submit_spots
  configs = [config]
  expanded = []
  keys = %i{instance_type}

  unless config[:subnet_filter]
    # => Use explicitly specified subnets
    keys << :subnet_id
  else
    # => Enable cascading through matching subnets
    client = ::Aws::EC2::Client.new(region: config[:region])
    subnets = client.describe_subnets(
      filters: [
        {
          name: "tag:#{config[:subnet_filter][:tag]}",
          values: [config[:subnet_filter][:value]],
        },
      ]
    ).subnets
    raise "A subnet matching '#{config[:subnet_filter][:tag]}:#{config[:subnet_filter][:value]}' does not exist!" unless subnets.any?

    configs = subnets.map do |subnet|
      new_config = config.clone
      new_config[:subnet_id] = subnet.subnet_id
      new_config[:subnet_filter] = nil
      new_config
    end
  end

  keys.each do |key|
    configs.each do |conf|
      expanded.push expand_config(conf, key)
    end
    configs = expanded.flatten
    expanded = []
  end

  errs = []
  configs.each do |conf|
    @config = conf
    return submit_spot
  rescue => e
    errs.append(e)
  end
  raise ["Could not create a spot instance:", errs].flatten.join("\n")
end

#sudo_command ⇒ Object

Returns the sudo command to use or empty string if sudo is not configured



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# File 'lib/kitchen/driver/ec2.rb', line 635

def sudo_command
  instance.provisioner[:sudo] ? instance.provisioner[:sudo_command].to_s : ""
end

#update_username(state) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 358

def update_username(state)
  # BUG: With the following equality condition on username, if the user specifies 'root'
  # as the transport's username then we will overwrite that value with one from the standard
  # platform definitions. This seems difficult to handle here as the default username is
  # provided by the underlying transport classes, and is often non-nil (eg; 'root'), leaving
  # us no way to distinguish a user-set value from the transport's default.
  # See https://github.com/test-kitchen/kitchen-ec2/pull/273
  if actual_platform &&
      instance.transport[:username] == instance.transport.class.defaults[:username]
    debug("No SSH username specified: using default username #{actual_platform.username} " \
          " for image #{config[:image_id]}, which we detected as #{actual_platform}.")
    state[:username] = actual_platform.username
  end
end

#wait_until_ready(server, state) ⇒ Object

Normally we could use ‘server.wait_until_running` but we actually need to check more than just the instance state



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# File 'lib/kitchen/driver/ec2.rb', line 515

def wait_until_ready(server, state)
  wait_with_destroy(server, state, "to become ready") do |aws_instance|
    hostname = hostname(aws_instance, config[:interface])
    # We aggressively store the hostname so if the process fails here
    # we still have it, even if it will change later
    state[:hostname] = hostname
    # Euca instances often report ready before they have an IP
    ready = aws_instance.exists? &&
      aws_instance.state.name == "running" &&
      hostname != "0.0.0.0"

    if ready && ( hostname.nil? || hostname == "" )
      debug("Unable to detect hostname using interface_type #{config[:interface]}. Fallback to ordered mapping")
      state[:hostname] = hostname(aws_instance, nil)
    end
    if ready && windows_os?
      output = server.console_output.output
      unless output.nil?
        output = Base64.decode64(output)
        debug "Console output: --- \n#{output}"
      end
      ready = !!(output =~ /Windows is Ready to use/)
    end
    ready
  end
end

#wait_with_destroy(server, state, status_msg, &block) ⇒ Object

Poll a block, waiting for it to return true. If it does not succeed within the configured time we destroy the instance to save people money



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# File 'lib/kitchen/driver/ec2.rb', line 544

def wait_with_destroy(server, state, status_msg, &block)
  wait_log = proc do |attempts|
    c = attempts * config[:retryable_sleep]
    t = config[:retryable_tries] * config[:retryable_sleep]
    info "Waited #{c}/#{t}s for instance <#{state[:server_id]}> #{status_msg}."
  end
  begin
    with_request_limit_backoff(state) do
      server.wait_until(
        max_attempts: config[:retryable_tries],
        delay: config[:retryable_sleep],
        before_attempt: wait_log,
        &block
      )
    end
  rescue ::Aws::Waiters::Errors::WaiterFailed
    error("Ran out of time waiting for the server with id [#{state[:server_id]}]" \
      " #{status_msg}, attempting to destroy it")
    destroy(state)
    raise
  end
end

#with_request_limit_backoff(state) ⇒ Object 



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# File 'lib/kitchen/driver/ec2.rb', line 582

def with_request_limit_backoff(state)
  retries = 0
  begin
    yield
  rescue ::Aws::EC2::Errors::RequestLimitExceeded, ::Aws::Waiters::Errors::UnexpectedError => e
    raise unless retries < 5 && e.message.include?("Request limit exceeded")

    retries += 1
    info("Request limit exceeded for instance <#{state[:server_id]}>." \
         " Trying again in #{retries**2} seconds.")
    sleep(retries**2)
    retry
  end
end