Module: StateTransitionHelper

Included in:
ScriptExecutionState
Defined in:
lib/help/state_transition_helper.rb

Instance Method Summary collapse

Instance Method Details

#attach_volume(volume_id, instance_id, temp_device_name) ⇒ Object

Attaches an EBS volume to an instance Input Parameters:

  • volume_id => EC2 ID for the EBS Volume to be attached

  • instance_id => EC2 ID for the instance to which the volume is supposed to be attached to

  • temp_device_name => device name to be used for attaching (e.g. /dev/sdj1)



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# File 'lib/help/state_transition_helper.rb', line 305

def attach_volume(volume_id, instance_id, temp_device_name)
  post_message("going to attach volume #{volume_id} to instance #{instance_id} on device #{temp_device_name}...")
  @logger.info "attach volume #{volume_id} to instance #{instance_id} on device #{temp_device_name}"
  ec2_handler().attach_volume(:volume_id => volume_id,
    :instance_id => instance_id,
    :device => temp_device_name
  )
  done = false
  timeout = 120
  while timeout > 0
    res = ec2_handler().describe_volumes(:volume_id => volume_id)
    vol_state = res['volumeSet']['item'][0]['status']
    attachment_state = "attaching"
    if res['volumeSet']['item'][0]['attachmentSet'] != nil
      attachment_state = res['volumeSet']['item'][0]['attachmentSet']['item'][0]['status']
    end
    @logger.debug "storage attaching: volume state: #{vol_state}, attachment state: #{attachment_state}"
    if vol_state == 'in-use' && attachment_state == 'attached' 
      done = true
      timeout = 0
    end
    sleep(5)
    timeout -= 5
  end
  msg = ""
  if !done
    msg = "Failed to attach volume '#{volume_id}' to instance '#{instance_id}"
    @logger.error "#{msg}"
    raise Exception.new("volume #{volume_id} not attached")
  else
    msg = "volume #{volume_id} successfully attached" 
    @logger.info "#{msg}"
  end
  post_message("#{msg}")
end

#connect(dns_name, user_name, ssh_keyfile = nil, ssh_keydata = nil, trials = 5, wait_between_trials = 20) ⇒ Object

Connects to the remote host via SSH. Params:

  • dns_name => machine to connect to

  • user_name => name to be used for connection

  • ssh_keyfile => key-file used for ssh

  • ssh_keydata => contents of key-file (either use ssh_keyfile or ssh_keydata)

Returns:

  • OS of the connected machine



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# File 'lib/help/state_transition_helper.rb', line 40

def connect(dns_name, user_name, ssh_keyfile = nil, ssh_keydata = nil,
    trials = 5, wait_between_trials = 20)
  post_message("connecting '#{user_name}' to #{dns_name}...")
  connected = false
  last_connection_problem = ""
  remaining_trials = trials-1
  while !connected && remaining_trials > 0
    remaining_trials -= 1
    if ssh_keyfile != nil
      begin
        @logger.info("connecting using keyfile")
        remote_handler().connect_with_keyfile(dns_name, ssh_keyfile)
        connected = true
      rescue Exception => e
        @logger.info("connection failed due to #{e}")
        last_connection_problem = "#{e}"
        @logger.debug(e.backtrace.select(){|line| line.include?("state_transition_helper")}.join("\n"))
      end
    elsif ssh_keydata != nil
      begin
        @logger.info("connecting using keydata")
        remote_handler().connect(dns_name, user_name, ssh_keydata)
        connected = true
      rescue Exception => e
        @logger.info("connection failed due to #{e}")
        last_connection_problem = "#{e}"
        @logger.debug(e.backtrace.select(){|line| line.include?("state_transition_helper")}.join("\n"))
      end
    else
      raise Exception.new("no key information specified")
    end
    if !connected
      sleep(wait_between_trials) #try again
    end
  end
  if !connected
    raise Exception.new("connection attempts stopped (#{last_connection_problem})")
  end
  os = remote_handler().retrieve_os()
  sudo = remote_handler().use_sudo ? " [sudo]" : ""
  post_message("connected to #{dns_name}#{sudo}. OS installed is #{os}")
  @logger.info "connected to #{dns_name}#{sudo}"
  return os
end

#copy_distribution(destination_path) ⇒ Object

Copy all files of a running linux distribution via rsync to a mounted directory Input Parameters:

  • destination_path => where to copy to



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# File 'lib/help/state_transition_helper.rb', line 720

def copy_distribution(destination_path)
  post_message("going to start copying files to #{destination_path}. This may take quite a time...")
  @logger.debug "start copying to #{destination_path}"
  start = Time.new.to_i
  if remote_handler().tools_installed?("rsync")
    @logger.debug "use rsync command line"
    status = remote_handler().local_rsync("/", "#{destination_path}", "#{destination_path}")
    status = remote_handler().local_rsync("/dev/", "#{destination_path}/dev/")
    if status == false
      raise Exception.new("failed to copy distribution remotely using rsync")
    end
  else
    @logger.debug "use cp command line"
    status = remote_handler().local_rcopy("/", "#{destination_path}", "/proc /sys /dev /mnt")
    if status == false
      raise Exception.new("failed to copy distribution remotely using cp")
    end
    status = remote_handler().mkdir("#{destination_path}/proc")
    status = remote_handler().mkdir("#{destination_path}/sys")
    status = remote_handler().mkdir("#{destination_path}/mnt")
    status = remote_handler().mkdir("#{destination_path}/dev")
  end
  endtime = Time.new.to_i
  @logger.info "copy took #{(endtime-start)}s"
  post_message("copying is done (took #{endtime-start})s")
end

#create_fs(dns_name, device) ⇒ Object

Create a file-system on a given machine (assumes to be connected already). Input Parameters:

  • dns_name => IP used

  • device => device to be used for file-system creation (e.g. /dev/sdj)



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# File 'lib/help/state_transition_helper.rb', line 452

def create_fs(dns_name, device)
  post_message("going to create filesystem on #{dns_name} to #{device}...")
  @logger.debug "create filesystem on #{dns_name} to #{device}"
  status = remote_handler().create_filesystem("ext3", device)
  if status == false
    raise Exception.new("failed to create ext3 filesystem on #{device} device on #{dns_name}")
  end
  post_message("filesystem system successfully created")
end

#create_labeled_fs(dns_name, device, type, label) ⇒ Object

Create a file-system on a given machine (assumes to be connected already). Input Parameters:

  • dns_name => IP used

  • device => device to be used for file-system creation (e.g. /dev/sdj)

  • type => filesystem type (ext2, ext3, ext4)

  • label => add a label to the partition



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# File 'lib/help/state_transition_helper.rb', line 468

def create_labeled_fs(dns_name, device, type, label)
  post_message("going to create filesystem on #{dns_name} to #{device}...")
  @logger.debug "create filesystem of type '#{type}' (default is ext3) on '#{dns_name}' to '#{device}'"
  fs_type = "ext3"
  if !type.nil? && !type.empty?
    fs_type = type
  end
  @logger.debug "create '#{fs_type}' filesystem on device '#{device}'"
  status = remote_handler().create_filesystem(fs_type, device)
  if status == false
    raise Exception.new("failed to create #{type} filesystem on #{device} device on #{dns_name}")
  end
  post_message("#{fs_type} filesystem system successfully created on device #{device}")
  if !label.nil? && !label.empty?
    post_message("going to add label #{label} for device #{device}...")
    @logger.debug "add label '#{label}' to device '#{device}'"
    if remote_handler().set_device_label_ext(device, label, fs_type)
      post_message("label #{label} added to device #{device}")
    else
      raise Exception.new("failed to add label #{label} to device #{device}")
    end
  end
end

#create_snapshot(volume_id, description = "") ⇒ Object

Creates a snapshot for an EBS volume.

Input Parameters

  • volume_id => EC2 ID for the EBS volume to be snapshotted

Returns:

  • snapshot_id => EC2 ID for the snapshot created



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# File 'lib/help/state_transition_helper.rb', line 391

def create_snapshot(volume_id, description = "")
  post_message("going to create a snapshot for volume #{volume_id}...")
  @logger.debug "create snapshot for volume #{volume_id}"
  res = ec2_handler().create_snapshot(:volume_id => volume_id,
    :description => description)
  snapshot_id = res['snapshotId']
  @logger.info "snapshot_id = #{snapshot_id}"
  done = false
  while !done
    sleep(5)
    #TODO: check for timeout?
    res = ec2_handler().describe_snapshots(:snapshot_id => snapshot_id)
    @logger.debug "snapshot creating: #{res.inspect}"
    if res['snapshotSet']['item'][0]['status'] == 'completed'
      done = true
    end
  end
  post_message("snapshot is done with ID=#{snapshot_id}")
  return snapshot_id
end

#create_volume(availability_zone, size = "10") ⇒ Object

Creates a new EBS volume. Input Parameters:

  • availability_zone => availability zone for the volume

  • size => size in Gigabytes

Returns

  • volume_id => EC2 EBS Volume ID



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# File 'lib/help/state_transition_helper.rb', line 253

def create_volume(availability_zone, size = "10")
  post_message("going to create a new EBS volume of size #{size}GB...")
  @logger.debug "create volume in zone #{availability_zone}"
  res = ec2_handler().create_volume(:availability_zone => availability_zone, :size => size.to_s)
  volume_id = res['volumeId']
  started = false
  while !started
    sleep(5)
    #TODO: check for timeout?
    res = ec2_handler().describe_volumes(:volume_id => volume_id)
    state = res['volumeSet']['item'][0]['status']
    @logger.debug "volume state #{state}"
    if state == 'available'
      started = true
    end
  end
  post_message("EBS volume #{volume_id} is ready")
  return volume_id
end

#create_volume_from_snapshot(snapshot_id, availability_zone) ⇒ Object

Creates a new EBS volume from a snapshot ID. Input Parameters:

  • availability_zone => availability zone for the volume

  • size => size of the volume to be created

  • snapshot_id => EC2 Snapshot ID used to create the volume

Returns

  • volume_id => EC2 EBS Volume ID created



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# File 'lib/help/state_transition_helper.rb', line 280

def create_volume_from_snapshot(snapshot_id, availability_zone)
  post_message("going to create a new EBS volume from the specified snapshot...")
  @logger.debug "create volume in zone #{availability_zone}"
  res = ec2_handler().create_volume(:snapshot_id => snapshot_id, :availability_zone => availability_zone)
  volume_id = res['volumeId']
  started = false
  while !started
    sleep(5)
    #TODO: check for timeout?
    res = ec2_handler().describe_volumes(:volume_id => volume_id)
    state = res['volumeSet']['item'][0]['status']
    @logger.debug "volume state #{state}"
    if state == 'available'
      started = true
    end
  end
  post_message("EBS volume #{volume_id} is ready")
  return volume_id
end

#delete_snapshot(snapshot_id) ⇒ Object

Deletes a snapshot.



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# File 'lib/help/state_transition_helper.rb', line 413

def delete_snapshot(snapshot_id)
  post_message("going to delete snapshot #{snapshot_id}...")
  @logger.info("going to delete snapshot #{snapshot_id}...")
  ec2_handler().delete_snapshot(:snapshot_id => snapshot_id)
  @logger.info("snapshot #{snapshot_id} deleted")
  post_message("snapshot #{snapshot_id} deleted")
end

#delete_volume(volume_id) ⇒ Object

Delete an EBS volume. Input Parameters:

  • volume_id => EC2 ID for the EBS Volume to be deleted



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# File 'lib/help/state_transition_helper.rb', line 379

def delete_volume(volume_id)
  post_message("going to delete volume #{volume_id} (no longer needed)...")
  @logger.debug "delete volume #{volume_id}"
  ec2_handler().delete_volume(:volume_id => volume_id)
  post_message("volume #{volume_id} deleted")
end

#detach_volume(volume_id, instance_id) ⇒ Object

Detach an EBS volume from an instance. Input Parameters:

  • volume_id => EC2 ID for the EBS Volume to be detached

  • instance_id => EC2 ID for the instance to detach from



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# File 'lib/help/state_transition_helper.rb', line 345

def detach_volume(volume_id, instance_id)
  post_message("going to detach volume #{volume_id} from instance #{instance_id}...")
  @logger.info "detach volume #{volume_id} from instance #{instance_id}"
  ec2_handler().detach_volume(:volume_id => volume_id,
    :instance_id => instance_id
  )
  done = false
  timeout = 120
  while timeout > 0
    sleep(3)
    res = ec2_handler().describe_volumes(:volume_id => volume_id)
    @logger.debug "volume detaching: #{res.inspect}"
    if res['volumeSet']['item'][0]['status'] == 'available'
      done = true
      timeout = 0
    end
    sleep(5)
    timeout -= 5
  end
  msg = ""
  if !done
    msg = "Failed to detach volume '#{volume_id}' from instance '#{instance_id}"
    @logger.error "#{msg}"
    raise Exception.new("volume #{volume_id} not detached")
  else
    msg = "volume #{volume_id} successfully detached" 
    @logger.info "#{msg}"
  end
  post_message("#{msg}")
end

#determine_file(ip, user_name, ssh_keydata, file_candidates) ⇒ Object

From a list of existing files, return the first that exists



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# File 'lib/help/state_transition_helper.rb', line 820

def determine_file(ip, user_name, ssh_keydata, file_candidates)
  connect(ip, user_name, nil, ssh_keydata)
  begin
    file_candidates.each() {|file_path|
      if remote_handler().file_exists?(file_path)
        return file_path
      end
    }
    return nil
  rescue
    raise
  ensure
    disconnect()
  end
end

#disable_ssh_tty(host) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 781

def disable_ssh_tty(host)
  post_message("going to disable SSH tty on #{host}...")
  @logger.debug "disable SSH tty on "
  remote_handler().disable_sudoers_requiretty()
  post_message("SSH tty disabled")
end

#disconnect ⇒ Object

If a remote command handler is connected, disconnect him silently.



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# File 'lib/help/state_transition_helper.rb', line 86

def disconnect
  begin
    remote_handler().disconnect()
  rescue
  end
  self.remote_handler= nil
end

#ec2_handler ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 993

def ec2_handler()
  if @ec2_handler == nil
    @ec2_handler = @context[:ec2_api_handler]
  end
  @ec2_handler
end

#ec2_handler=(ec2_handler) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 1000

def ec2_handler=(ec2_handler)
  @ec2_handler = ec2_handler
end

#enable_ssh_tty(host) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 788

def enable_ssh_tty(host)
  post_message("going to enable SSH tty on #{host}...")
  @logger.debug "enable SSH tty on"
  remote_handler().enable_sudoers_requiretty()
  post_message("SSH tty enabled")
end

#get_aws_kernel_image_aki(source_endpoint, source_aki, target_endpoint) ⇒ Object

Mapping AmazonKernel Image IDs From documentation: docs.amazonwebservices.com/AWSEC2/latest/UserGuide/index.html?UserProvidedkernels.html

  • US-East-1

    aki-4c7d9525 ec2-public-images/pv-grub-hd00-V1.01-i386.gz.manifest.xml
aki-4e7d9527 ec2-public-images/pv-grub-hd00-V1.01-x86_64.gz.manifest.xml
aki-407d9529 ec2-public-images/pv-grub-hd0-V1.01-i386.gz.manifest.xml
aki-427d952b ec2-public-images/pv-grub-hd0-V1.01-x86_64.gz.manifest.xml
aki-525ea73b ec2-public-images/pv-grub-hd00_1.02-i386.gz.manifest.xml
aki-8e5ea7e7 ec2-public-images/pv-grub-hd00_1.02-x86_64.gz.manifest.xml
aki-805ea7e9 ec2-public-images/pv-grub-hd0_1.02-i386.gz.manifest.xml
aki-825ea7eb ec2-public-images/pv-grub-hd0_1.02-x86_64.gz.manifest.xml

  • US-West-1

    aki-9da0f1d8 ec2-public-images-us-west-1/pv-grub-hd00-V1.01-i386.gz.manifest.xml
aki-9fa0f1da ec2-public-images-us-west-1/pv-grub-hd00-V1.01-x86_64.gz.manifest.xml
aki-99a0f1dc ec2-public-images-us-west-1/pv-grub-hd0-V1.01-i386.gz.manifest.xml
aki-9ba0f1de ec2-public-images-us-west-1/pv-grub-hd0-V1.01-x86_64.gz.manifest.xml
aki-87396bc2 ec2-public-images-us-west-1/pv-grub-hd00_1.02-i386.gz.manifest.xml
aki-81396bc4 ec2-public-images-us-west-1/pv-grub-hd00_1.02-x86_64.gz.manifest.xml
aki-83396bc6 ec2-public-images-us-west-1/pv-grub-hd0_1.02-i386.gz.manifest.xml
aki-8d396bc8 ec2-public-images-us-west-1/pv-grub-hd0_1.02-x86_64.gz.manifest.xml

  • EU-West-1

    aki-47eec433 ec2-public-images-eu/pv-grub-hd00-V1.01-i386.gz.manifest.xml
aki-41eec435 ec2-public-images-eu/pv-grub-hd00-V1.01-x86_64.gz.manifest.xml
aki-4deec439 ec2-public-images-eu/pv-grub-hd0-V1.01-i386.gz.manifest.xml
aki-4feec43b ec2-public-images-eu/pv-grub-hd0-V1.01-x86_64.gz.manifest.xml
aki-8a6657fe ec2-public-images-eu/pv-grub-hd00_1.02-i386.gz.manifest.xml
aki-60695814 ec2-public-images-eu/pv-grub-hd00_1.02-x86_64.gz.manifest.xml
aki-64695810 ec2-public-images-eu/pv-grub-hd0_1.02-i386.gz.manifest.xml
aki-62695816 ec2-public-images-eu/pv-grub-hd0_1.02-x86_64.gz.manifest.xml

  • AP-SouthEast-1

    aki-6fd5aa3d ec2-public-images-ap-southeast-1/pv-grub-hd00-V1.01-i386.gz.manifest.xml
aki-6dd5aa3f ec2-public-images-ap-southeast-1/pv-grub-hd00-V1.01-x86_64.gz.manifest.xml
aki-13d5aa41 ec2-public-images-ap-southeast-1/pv-grub-hd0-V1.01-i386.gz.manifest.xml
aki-11d5aa43 ec2-public-images-ap-southeast-1/pv-grub-hd0-V1.01-x86_64.gz.manifest.xml
aki-a0225af2 ec2-public-images-ap-southeast-1/pv-grub-hd00_1.02-i386.gz.manifest.xml
aki-a6225af4 ec2-public-images-ap-southeast-1/pv-grub-hd00_1.02-x86_64.gz.manifest.xml
aki-a4225af6 ec2-public-images-ap-southeast-1/pv-grub-hd0_1.02-i386.gz.manifest.xml
aki-aa225af8 ec2-public-images-ap-southeast-1/pv-grub-hd0_1.02-x86_64.gz.manifest.xml

  • AP-NorthEast-1

    aki-d209a2d3 ec2-public-images-ap-northeast-1/pv-grub-hd0-V1.01-i386.gz.manifest.xml
aki-d409a2d5 ec2-public-images-ap-northeast-1/pv-grub-hd0-V1.01-x86_64.gz.manifest.xml
aki-d609a2d7 ec2-public-images-ap-northeast-1/pv-grub-hd00-V1.01-i386.gz.manifest.xml
aki-d809a2d9 ec2-public-images-ap-northeast-1/pv-grub-hd00-V1.01-x86_64.gz.manifest.xml
aki-e85df7e9 ec2-public-images-ap-northeast-1/pv-grub-hd00_1.02-i386.gz.manifest.xml
aki-ea5df7eb ec2-public-images-ap-northeast-1/pv-grub-hd00_1.02-x86_64.gz.manifest.xml
aki-ec5df7ed ec2-public-images-ap-northeast-1/pv-grub-hd0_1.02-i386.gz.manifest.xml
aki-ee5df7ef ec2-public-images-ap-northeast-1/pv-grub-hd0_1.02-x86_64.gz.manifest.xml



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# File 'lib/help/state_transition_helper.rb', line 883

def get_aws_kernel_image_aki(source_endpoint, source_aki, target_endpoint)
  map = { 'us-east-1' => {'aki-4c7d9525' => 'pv-grub-hd00-V1.01-i386',
                          'aki-4e7d9527' => 'pv-grub-hd00-V1.01-x86_64',
                          'aki-407d9529' => 'pv-grub-hd0-V1.01-i386',
                          'aki-427d952b' => 'pv-grub-hd0-V1.01-x86_64',
                          'aki-525ea73b' => 'pv-grub-hd00_1.02-i386',
                          'aki-8e5ea7e7' => 'pv-grub-hd00_1.02-x86_64',
                          'aki-805ea7e9' => 'pv-grub-hd0_1.02-i386',
                          'aki-825ea7eb' => 'pv-grub-hd0_1.02-x86_64'
                         }, 
          'us-west-1' => {'aki-9da0f1d8' => 'pv-grub-hd00-V1.01-i386',
                          'aki-9fa0f1da' => 'pv-grub-hd00-V1.01-x86_64',
                          'aki-99a0f1dc' => 'pv-grub-hd0-V1.01-i386',
                          'aki-9ba0f1de' => 'pv-grub-hd0-V1.01-x86_64',
                          'aki-87396bc2' => 'pv-grub-hd00_1.02-i386',
                          'aki-81396bc4' => 'pv-grub-hd00_1.02-x86_64',
                          'aki-83396bc6' => 'pv-grub-hd0_1.02-i386',
                          'aki-8d396bc8' => 'pv-grub-hd0_1.02-x86_64'
                         },
          'eu-west-1' => {'aki-47eec433' => 'pv-grub-hd00-V1.01-i386',
                          'aki-41eec435' => 'pv-grub-hd00-V1.01-x86_64',
                          'aki-4deec439' => 'pv-grub-hd0-V1.01-i386',
                          'aki-4feec43b' => 'pv-grub-hd0-V1.01-x86_64',
                          'aki-8a6657fe' => 'pv-grub-hd00_1.02-i386',
                          'aki-60695814' => 'pv-grub-hd00_1.02-x86_64',
                          'aki-64695810' => 'pv-grub-hd0_1.02-i386',
                          'aki-62695816' => 'pv-grub-hd0_1.02-x86_64'
                         },
          'ap-southeast-1' => {'aki-6fd5aa3d' => 'pv-grub-hd00-V1.01-i386',
                               'aki-6dd5aa3f' => 'pv-grub-hd00-V1.01-x86_64',
                               'aki-13d5aa41' => 'pv-grub-hd0-V1.01-i386',
                               'aki-11d5aa43' => 'pv-grub-hd0-V1.01-x86_64',
                               'aki-a0225af2' => 'pv-grub-hd00_1.02-i386',
                               'aki-a6225af4' => 'pv-grub-hd00_1.02-x86_64',
                               'aki-a4225af6' => 'pv-grub-hd0_1.02-i386',
                               'aki-aa225af8' => 'pv-grub-hd0_1.02-x86_64'
                         },
          'ap-northeast-1' => {'aki-d209a2d3' => 'pv-grub-hd00-V1.01-i386',
                               'aki-d409a2d5' => 'pv-grub-hd00-V1.01-x86_64',
                               'aki-d609a2d7' => 'pv-grub-hd0-V1.01-i386',
                               'aki-d809a2d9' => 'pv-grub-hd0-V1.01-x86_64',
                               'aki-e85df7e9' => 'pv-grub-hd00_1.02-i386',
                               'aki-ea5df7eb' => 'pv-grub-hd00_1.02-x86_64',
                               'aki-ec5df7ed' => 'pv-grub-hd0_1.02-i386',
                               'aki-ee5df7ef' => 'pv-grub-hd0_1.02-x86_64'
                         }
        }
  target_aki = ''
  source_region = get_aws_region_from_endpoint(source_endpoint)
  target_region = get_aws_region_from_endpoint(target_endpoint)
  post_message("mapping AKI '#{source_aki}' from #{source_region} region to #{target_region} region...")

  if map[source_region] == nil
    Exception.new("source region not supported")
  elsif map[target_region] == nil
    Exception.new("target region not supported")
  else
    if map[source_region][source_aki] == nil
      Exception.new("aki not found in source region")
    else
      pv_grub_info = map[source_region][source_aki]
      map[target_region].each() {|key, value|
        if pv_grub_info.eql?(value)
          @logger.debug "found AKI: #{key} for #{value}"
          target_aki = key
          break
        end
      }
    end
  end
  post_message("AKI mapped to #{target_aki}")
  return target_aki
end

#get_aws_region_from_endpoint(endpoint) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 957

def get_aws_region_from_endpoint(endpoint)
  region = "us-east-1" 
  case endpoint
    when /us-east/
      region = "us-east-1"
    when /us-west/
      region = "us-west-1"
    when /eu-west/
      region = "eu-west-1"
    when /ap-southeast/
      region = "ap-southeast-1"
    when /ap-northeast/
      region = "ap-northeast-1"
    else
      region = "us-east-1"
  end
  return region
end

#get_partition_fs_type(part) ⇒ Object

Get partition filesytem type



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# File 'lib/help/state_transition_helper.rb', line 674

def get_partition_fs_type(part)
  post_message("Retrieving '#{part}' partition filesystem type...")
  @logger.debug "get #{part} partition filesystel type"
  # get partition device and then its fs type
  part_fs_type = remote_handler().get_partition_fs_type(part)
  @logger.debug "Found '#{part_fs_type}' as filesystem type"
  if part_fs_type.nil? || part_fs_type.empty?
    raise Exception.new("Failed to retrieve filesystem type for '#{part}' partition")
  else
    post_message("'#{part}' partition contains an #{part_fs_type} filesystem")
  end
  return part_fs_type
end

#get_partition_fs_type_and_label(part) ⇒ Object

Get partition filesytem type and label



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# File 'lib/help/state_transition_helper.rb', line 689

def get_partition_fs_type_and_label(part)
  post_message("Retrieving '#{part}' partition filesystem type...")
  @logger.debug "get #{part} partition filesystel type"
  # get partition device and then its fs type
  part_fs_type = remote_handler().get_partition_fs_type(part)
  @logger.debug "Found '#{part_fs_type}' as filesystem type"
  if part_fs_type.nil? || part_fs_type.empty?
    raise Exception.new("Failed to retrieve filesystem type for '#{part}' partition")
  else
    post_message("'#{part}' partition contains an #{part_fs_type} filesystem")
  end
  part_device = remote_handler().get_partition_device(part)
  @logger.debug "Found '#{part_device}' as partition device"
  if part_device.nil? || part_device.empty?
    raise Exception.new("Failed to retrieve device for '#{part}' partition")
  else
     post_message("'#{part}' partitition on device '#{part_device}'")
  end
  part_label = remote_handler().get_device_label_ext(part_device, part_fs_type)
  @logger.debug "Found label '#{part_label}'"
  if part_label.nil? || part_label.empty?
    post_message("'#{part}' partition has no label specified")
  else
    post_message("'#{part}' partition label '#{part_label}' for device node '#{part_device}'")
  end
  return part_fs_type, part_label
end

#get_partition_label(part) ⇒ Object

Get partition label



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# File 'lib/help/state_transition_helper.rb', line 613

def get_partition_label(part)
  post_message("Retrieving '#{part}' partition label if any...")
  @logger.debug "get #{part} partition label"
  # get part device and then its label
  part_device = remote_handler().get_partition_device(part)
  @logger.debug "Found '#{part_device}' as partition device"
  label = remote_handler().get_device_label(part_device)
  @logger.debug "Found label '#{label}'"
  if label.nil? || label.empty?
    post_message("'#{part}' partition has no label specified")
  else
    post_message("'#{part}' partition label '#{label}' for device node '#{part_device}'")
  end
  return label
end

#get_root_partition_fs_type ⇒ Object

Get root filesytem type



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# File 'lib/help/state_transition_helper.rb', line 630

def get_root_partition_fs_type()
  post_message("Retrieving '/' root partition filesystem type...")
  @logger.debug "get root partition filesystel type"
  # get root device and then its fs type
  root_fs_type = remote_handler().get_root_fs_type()
  @logger.debug "Found '#{root_fs_type}' as root filesystem type"
  if root_fs_type.nil? || root_fs_type.empty?
    raise Exception.new("Failed to retrieve filesystem type for '/' root partition")
  else
    post_message("'/' root partition contains an #{root_fs_type} filesystem")
  end
  return root_fs_type
end

#get_root_partition_fs_type_and_label ⇒ Object

Get root filesytem type and label



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# File 'lib/help/state_transition_helper.rb', line 645

def get_root_partition_fs_type_and_label()
  post_message("Retrieving '/' root partition filesystem type and label...")
  @logger.debug "get root partition filesystel type"
  # get root device and then its fs type
  root_fs_type = remote_handler().get_root_fs_type()
  @logger.debug "Found '#{root_fs_type}' as root filesystem type"
  if root_fs_type.nil? || root_fs_type.empty?
    raise Exception.new("Failed to retrieve filesystem type for '/' root partition")
  else
    post_message("'/' root partition contains an #{root_fs_type} filesystem")
  end
  root_device = remote_handler().get_root_device()
  @logger.debug "Found '#{root_device}' as root device"
  if root_device.nil? || root_device.empty?
    raise Exception.new("Failed to retrieve root device for '/' root partition")
  else
     post_message("'/' root partitition on root device '#{root_device}'")
  end
  root_label = remote_handler().get_device_label_ext(root_device, root_fs_type)
  @logger.debug "Found label '#{root_label}'"
  if root_label.nil? || root_label.empty?
    post_message("'/' root partition has no label specified")
  else
    post_message("'/' root partition label '#{root_label}' for root device node '#{root_device}'")
  end
  return root_fs_type, root_label
end

#get_root_partition_label ⇒ Object

Get root partition label



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# File 'lib/help/state_transition_helper.rb', line 596

def get_root_partition_label()
  post_message("Retrieving '/' root partition label if any...")
  @logger.debug "get root partition label"
  # get root device and then its label
  root_device = remote_handler().get_root_device()
  @logger.debug "Found '#{root_device}' as root device"
  label = remote_handler().get_device_label(root_device)
  @logger.debug "Found label '#{label}'"
  if label.nil? || label.empty?
    post_message("'/' root partition has no label specified")
  else
    post_message("'/' root partition label '#{label}' for root device node '#{root_device}'")
  end
  return label
end

#launch_instance(ami_id, key_name, security_group_name, ec2_handler = nil, type = nil) ⇒ Object

Launch an instance based on an AMI ID Input Parameters:

  • ami_id => ID of the AMI to be launched

  • key_name => name of the key to access the instance

  • security_group_name => name of the security group to be used

  • type => type of instance to start

Returned information:

  • instance_id => ID of the started instance

  • dns_name => DNS name of the started instance

  • availability_zone => Availability zone of the started instance

  • kernel_id => EC2 Kernel ID of the started instance

  • ramdisk_id => EC2 Ramdisk ID of the started instance

  • architecture => architecture (e.g. 386i, 64x) of the started instance



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# File 'lib/help/state_transition_helper.rb', line 107

def launch_instance(ami_id, key_name, security_group_name, ec2_handler = nil, type = nil)
  ec2_handler = ec2_handler() if ec2_handler == nil
  post_message("starting up instance to execute the script (AMI = #{ami_id}) ...")
  @logger.debug "start up AMI #{ami_id}"
  # find out the image architecture first
  image_props = ec2_handler.describe_images(:image_id => ami_id)
  architecture = image_props['imagesSet']['item'][0]['architecture']
  instance_type = "m1.small"
  #instance_type = "t1.micro"
  if architecture != "i386"
    instance_type = "m1.large"
  end
  instance_type = type if type != nil
  arch_log_msg = "Architecture of image #{ami_id} is #{architecture}. Use instance_type #{instance_type}."
  @logger.info arch_log_msg
  post_message(arch_log_msg)
  # now start it
  res = ec2_handler.run_instances(:image_id => ami_id,
    :security_group => security_group_name, :key_name => key_name,
    :instance_type => instance_type
  )
  instance_id = res['instancesSet']['item'][0]['instanceId']
  @logger.info "started instance #{instance_id}"
  post_message("Started instance #{instance_id}. wait until it is ready...")
  #availability_zone , key_name/group_name
  started = false
  while started == false
    sleep(5)
    res = ec2_handler.describe_instances(:instance_id => instance_id)
    state = res['reservationSet']['item'][0]['instancesSet']['item'][0]['instanceState']
    @logger.info "instance is in state #{state['name']} (#{state['code']})"
    if state['code'].to_i == 16
      started = true
      post_message("instance is up and running")
      dns_name = res['reservationSet']['item'][0]['instancesSet']['item'][0]['dnsName']
      availability_zone = res['reservationSet']['item'][0]['instancesSet']['item'][0]['placement']['availabilityZone']
      kernel_id = res['reservationSet']['item'][0]['instancesSet']['item'][0]['kernelId']
      ramdisk_id = res['reservationSet']['item'][0]['instancesSet']['item'][0]['ramdiskId']
      architecture = res['reservationSet']['item'][0]['instancesSet']['item'][0]['architecture']
    elsif state['code'].to_i != 0
      post_message("instance in state #{state['name']}")
      raise Exception.new('instance failed to start up')
    else
      post_message("instance still starting up...")
    end
  end
  return instance_id, dns_name, availability_zone, kernel_id, ramdisk_id, architecture
end

#mount_fs(mount_point, device) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 519

def mount_fs(mount_point, device)
  post_message("going to mount #{device} on #{mount_point}...")
  @logger.debug "mount #{device} on #{mount_point}"
  if !remote_handler.file_exists?(mount_point)
    post_message("creating mount point #{mount_point}...")
    @logger.debug "creating mount point #{mount_point}"
    remote_handler().mkdir(mount_point)
  end
  #XXX: detect new kernel that have /dev/xvdX device node instaed of /dev/sdX
  if device =~ /\/dev\/sd[a-z]/
    if !remote_handler().file_exists?(device)
      post_message("'#{device}' device node not found, checking for new kernel support...")
      @logger.debug "'#{device}' device node not found, checking for new kernel support" 
      new_device = device.gsub('sd', 'xvd')
      if remote_handler().file_exists?(new_device)
        post_message("'#{new_device}' device node found")
        @logger.debug "'#{new_device}' device node found"
        device = new_device
      end
    end
  #elsif device =~/\/dev\/xvd[a-z]/
  end

  done = false
  timeout = 120
  while timeout > 0
    res = remote_handler().mount(device, mount_point)
    if remote_handler().drive_mounted?(mount_point)
      done = true
      timeout = 0
    end
    sleep(5)
    timeout -= 5
  end
  msg = ""
  if !done
    msg = "Failed to mount device '#{device}' to '#{mount_point}"
    @logger.error "#{msg}"
    raise Exception.new("device #{device} not mounted")
  else
    msg = "device #{device} successfully mounted" 
    @logger.info "#{msg}"
  end
  post_message("#{msg}")
end

#mount_fs_old(mount_point, device) ⇒ Object

Create a file-system on a given machine (assumes to be connected already). Input Parameters:

  • mount_point => directory to be mounted on the device

  • device => device used for mounting



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# File 'lib/help/state_transition_helper.rb', line 496

def mount_fs_old(mount_point, device)
  post_message("going to mount #{device} on #{mount_point}...")
  @logger.debug "mount #{device} on #{mount_point}"
  if !remote_handler.file_exists?(mount_point)
    remote_handler().mkdir(mount_point)
  end
  remote_handler().mount(device, mount_point)
  trials = 3
  mounted = false
  while trials > 0
    sleep(5) #give mount some time
    if remote_handler().drive_mounted?(mount_point)
      mounted = true
      break
    end
    trials -= trials
  end
  if !mounted
    raise Exception.new("drive #{mount_point} not mounted")
  end
  post_message("mount successful")
end

#register_snapshot(snapshot_id, name, root_device_name, description, kernel_id, ramdisk_id, architecture) ⇒ Object

Registers a snapshot as EBS-booted AMI. Input Parameters:

  • snapshot_id => EC2 Snapshot ID used to be used

  • name => name of the AMI to be created

  • root_device_name => Root device name (e.g. /dev/sdj) to be used for AMI registration

  • description => description of the AMI to be created

  • kernel_id => EC2 Kernel ID to be used for AMI registration

  • ramdisk_id => EC2 Ramdisk ID to be used for AMI registration

  • architecture => architecture (e.g. 386i, 64x) to be used for AMI registration

Returns:

  • image_id => ID of the AMI created and registered



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# File 'lib/help/state_transition_helper.rb', line 432

def register_snapshot(snapshot_id, name, root_device_name, description, kernel_id, ramdisk_id, architecture)
  post_message("going to register snapshot #{snapshot_id}...")
  @logger.debug "register snapshot #{snapshot_id} as #{name} using AKI '#{kernel_id}' ARI '#{ramdisk_id}' and arch '#{architecture}'"
  res = ec2_handler().register_image_updated(:snapshot_id => snapshot_id,
    :kernel_id => kernel_id, :architecture => architecture,
    :root_device_name => root_device_name,
    :description => description, :name => name,
    :ramdisk_id => ramdisk_id
  )
  @logger.debug "result of registration = #{res.inspect}"
  image_id = res['imageId']
  @logger.info "resulting image_id = #{image_id}"
  post_message("snapshot #{snapshot_id} successfully registered as AMI #{image_id} ")
  return image_id
end

#remote_copy(user_name, keyname, source_dir, dest_machine, dest_user, dest_dir) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 795

def remote_copy(user_name, keyname, source_dir, dest_machine, dest_user, dest_dir)
  post_message("going to remote copy all files from volume. This may take some time...")
  key_path_candidates = ["/#{user_name}/.ssh/", "/home/#{user_name}/.ssh/"]
  key_path_candidates.each() {|key_path|
    key_file = "#{key_path}#{keyname}.pem"
    if remote_handler().file_exists?(key_path)
      if remote_handler().tools_installed?("rsync")
        @logger.debug "use rsync command on #{key_file}"
        remote_handler().remote_rsync(key_file, source_dir, dest_machine, dest_user, dest_dir)
      else
        @logger.debug "use scp command #{key_file}"
        remote_handler().scp(key_file, source_dir, dest_machine, dest_user, dest_dir)
      end
      break
    end
  }
  post_message("remote copy operation done")
end

#remote_copy_old(user_name, keyname, source_dir, dest_machine, dest_dir) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 762

def remote_copy_old(user_name, keyname, source_dir, dest_machine, dest_dir)
  post_message("going to remote copy all files from volume. This may take some time...")
  key_path_candidates = ["/#{user_name}/.ssh/", "/home/#{user_name}/.ssh/"]
  key_path_candidates.each() {|key_path|
    key_file = "#{key_path}#{keyname}.pem"
    if remote_handler().file_exists?(key_path)
      if remote_handler().tools_installed?("rsync")
        @logger.debug "use rsync command on #{key_file}"
        remote_handler().remote_rsync(key_file, source_dir, dest_machine, dest_dir)
      else
        @logger.debug "use scp command #{key_file}"
        remote_handler().scp(key_file, source_dir, dest_machine, dest_dir)
      end
      break
    end
  }
  post_message("remote copy operation done")
end

#remote_handler ⇒ Object

setting/retrieving handlers



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# File 'lib/help/state_transition_helper.rb', line 978

def remote_handler()
  if @remote_handler == nil
    if @context[:remote_command_handler] == nil
      @context[:remote_command_handler] = RemoteCommandHandler.new
    else
      @remote_handler = @context[:remote_command_handler]
    end
  end
  @remote_handler
end

#remote_handler=(remote_handler) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 989

def remote_handler=(remote_handler)
  @remote_handler = remote_handler
end

#retrieve_instances ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 239

def retrieve_instances()
  @context[:script].post_message("going to retrieve all instances...")
  inst = @context[:ec2_api_handler].describe_instances()
  @context[:script].post_message("found #{inst.size} instances")
  @logger.info("found #{inst.size} instances")
  @context[:ec2_instances] = inst
end

#retrieve_security_groups ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 231

def retrieve_security_groups()
  @context[:script].post_message("going to retrieve security groups...")
  sgs = @context[:ec2_api_handler].describe_security_groups()
  @context[:script].post_message("found #{sgs.size} security groups")
  @logger.info("found #{sgs.size} security groups")
  @context[:security_groups] = sgs
end

#shut_down_instance(instance_id) ⇒ Object

Shuts down an instance. Input Parameters:

  • instance_id => ID of the instance to be shut down



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# File 'lib/help/state_transition_helper.rb', line 212

def shut_down_instance(instance_id)
  post_message("going to shut down the temporary instance #{instance_id}...")
  @logger.debug "shutdown instance #{instance_id}"
  res = ec2_handler().terminate_instances(:instance_id => instance_id)
  done = false
  while done == false
    sleep(5)
    res = ec2_handler().describe_instances(:instance_id => instance_id)
    state = res['reservationSet']['item'][0]['instancesSet']['item'][0]['instanceState']
    @logger.debug "instance in state #{state['name']} (#{state['code']})"
    if state['code'].to_i == 48
      done = true
    elsif state['code'].to_i != 32
      raise Exception.new('instance failed to shut down')
    end
  end
  post_message("instance #{instance_id} is terminated")
end

#start_instance(instance_id, timeout = 240) ⇒ Object

Start an instance Input Paramters:

  • instance_id => ID of the instance to start

  • timeout => a timeout for waiting instance to start to avoid infinite loop (default set to 4m)

Return Parameters (Array):

  • instance_id

  • public_dns_name



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# File 'lib/help/state_transition_helper.rb', line 163

def start_instance(instance_id, timeout = 240)
  dns_name = ""
  post_message("going to start instance '#{instance_id}'...")
  res = ec2_handler().describe_instances(:instance_id => instance_id)
  state = res['reservationSet']['item'][0]['instancesSet']['item'][0]['instanceState']
  if state['code'].to_i == 16
    dns_name = res['reservationSet']['item'][0]['instancesSet']['item'][0]['dnsName'] 
    msg = "instance '#{instance_id}' already started"
    @logger.warn "#{msg}"
    post_message("#{msg}")
    done = true
  else
    @logger.debug "start instance #{instance_id}"
    ec2_handler().start_instances(:instance_id => instance_id)
  end
    while timeout > 0 && !done
    res = ec2_handler().describe_instances(:instance_id => instance_id)
    state = res['reservationSet']['item'][0]['instancesSet']['item'][0]['instanceState']
    @logger.debug "instance in state '#{state['name']}' (#{state['code']})"
    if state['code'].to_i == 16 
      done = true
      timeout = 0
      dns_name = res['reservationSet']['item'][0]['instancesSet']['item'][0]['dnsName']
    elsif state['code'].to_i != 0 
      done = false
      timeout = 0
      msg = "instance in state '#{state['name']}'"
      @logger.error "#{msg}"
      post_message("#{msg}")
    end
    sleep(5)
    timeout -= 5
  end
  msg = ""
  if !done
    msg = "Failed to start instance '#{instance_id}"
    @logger.error "#{msg}"
    raise Exception.new("Unable to start instance '#{instance_id}'}")
  else
    msg = "'#{instance_id}' successfully started" 
    @logger.info "#{msg}" 
  end
  post_message("#{msg}")
  return instance_id, dns_name
end

#unmount_fs(mount_point) ⇒ Object

Unmount a drive Input Parameters:

  • mount_point => directory to be unmounted



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# File 'lib/help/state_transition_helper.rb', line 568

def unmount_fs(mount_point)
  post_message("going to unmount #{mount_point}...")
  @logger.debug "unmount #{mount_point}"

  done = false
  timeout = 120
  while timeout > 0
    res = remote_handler().umount(mount_point)
    if !remote_handler().drive_mounted?(mount_point)
      done = true
      timeout = 0
    end
    sleep(5)
    timeout -= 5
  end
  msg = ""
  if !done
    msg = "Failed to umount '#{mount_point}'"
    @logger.error "#{msg}"
    raise Exception.new("#{mount_point} still mounted")
  else
    msg = "#{mount_point} successfully mounted" 
    @logger.info "#{msg}"
  end
  post_message("#{msg}")
end

#upload_file(ip, user, key_data, file, target_file) ⇒ Object 



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# File 'lib/help/state_transition_helper.rb', line 814

def upload_file(ip, user, key_data, file, target_file)
  post_message("going to upload #{file} to #{user}@#{ip}:#{target_file}")
  remote_handler().upload(ip, user, key_data, file, target_file)
end

#zip_volume(source_dir, zip_file_dest, zip_file_name) ⇒ Object

Zips all files on a mounted-directory into a file Input Parameters:

  • source_dir => where to copy from

  • zip_file_dest => path where the zip-file should be stored

# zip_file_name => name of the zip file (without .zip suffix)



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# File 'lib/help/state_transition_helper.rb', line 752

def zip_volume(source_dir, zip_file_dest, zip_file_name)
  post_message("going to zip the EBS volume")
  stderr = remote_handler().zip(source_dir, zip_file_dest+"/"+zip_file_name)
  if stderr.size > 0
    @logger.info("zip operation generated error and might not be complete. output: #{stderr.join("\n")}")
    post_message("zip operation generated error and might not be complete. output: #{stderr.join("\n")}")
  end
  post_message("EBS volume successfully zipped")
end