Class: Bosh::Agent::Util

Inherits:
Object show all
Includes:
Exec
Defined in:
lib/bosh_agent/util.rb

Class Method Summary collapse

Class Method Details

.base_dir ⇒ Object 



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# File 'lib/bosh_agent/util.rb', line 8

def base_dir
  Bosh::Agent::Config.base_dir
end

.block_device_size(block_device) ⇒ Object 



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# File 'lib/bosh_agent/util.rb', line 82

def block_device_size(block_device)
  unless File.blockdev?(block_device)
    raise Bosh::Agent::MessageHandlerError, "Not a blockdevice"
  end

  result = sh("/sbin/sfdisk -s #{block_device} 2>&1")
  unless result.output.match(/\A\d+\Z/)
    raise Bosh::Agent::MessageHandlerError,
      "Unable to determine disk size"
  end
  result.output.to_i
end

.config_binding(spec) ⇒ Binding

Returns Template evaluation binding.

Parameters:

  • Instance (Hash) —

    spec

Returns:

  • (Binding) —

    Template evaluation binding



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# File 'lib/bosh_agent/util.rb', line 63

def config_binding(spec)
  Bosh::Common::TemplateEvaluationContext.new(spec).get_binding
end

.create_symlink(src, dst) ⇒ Object 



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# File 'lib/bosh_agent/util.rb', line 133

def create_symlink(src, dst)
  # FileUtils doesn have 'no-deference' for links - causing ln_sf to
  # attempt to create target link in dst rather than to overwrite it.
  # BROKEN: FileUtils.ln_sf(src, dst)
  out = %x(ln -nsf #{src} #{dst} 2>&1)
  unless $?.exitstatus == 0
    raise Bosh::Agent::MessageHandlerError,
          "Failed to link '#{src}' to '#{dst}': #{out}"
  end
end

.get_network_info ⇒ Object 



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# File 'lib/bosh_agent/util.rb', line 174

def get_network_info
  sigar = SigarBox.create_sigar
  net_info = sigar.net_info
  ifconfig = sigar.net_interface_config(net_info.default_gateway_interface)

  properties = {}
  properties["ip"] = ifconfig.address
  properties["netmask"] = ifconfig.netmask
  properties["gateway"] = net_info.default_gateway
  properties
end

.lazy_itable_init_enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bosh_agent/util.rb', line 78

def lazy_itable_init_enabled?
  File.exists?("/sys/fs/ext4/features/lazy_itable_init")
end

.logger ⇒ Object 



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# File 'lib/bosh_agent/util.rb', line 12

def logger
  Bosh::Agent::Config.logger
end

.partition_disk(dev, sfdisk_input) ⇒ Object 



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# File 'lib/bosh_agent/util.rb', line 67

def partition_disk(dev, sfdisk_input)
  if File.blockdev?(dev)
    sfdisk_cmd = "echo \"#{sfdisk_input}\" | sfdisk -uM #{dev}"
    output = %x[#{sfdisk_cmd}]
    unless $? == 0
      logger.info("failed to parition #{dev}")
      logger.info(output)
    end
  end
end

.run_hook(hook, job_template_name) ⇒ Object 



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# File 'lib/bosh_agent/util.rb', line 95

def run_hook(hook, job_template_name)
  hook_file = File.join(base_dir, 'jobs', job_template_name, 'bin', hook)

  unless File.exists?(hook_file)
    return nil
  end

  unless File.executable?(hook_file)
    raise Bosh::Agent::MessageHandlerError, "`#{hook}' hook for `#{job_template_name}' job is not an executable file"
  end

  env = {
    'PATH' => '/usr/sbin:/usr/bin:/sbin:/bin',
  }

  stdout_rd, stdout_wr = IO.pipe
  stderr_rd, stderr_wr = IO.pipe
  Process.spawn(env, hook_file, :out => stdout_wr, :err => stderr_wr, :unsetenv_others => true)
  Process.wait
  exit_status = $?.exitstatus
  stdout_wr.close
  stderr_wr.close
  result = stdout_rd.read
  error_output = stderr_rd.read

  logger.info("Hook #{hook} for job #{job_template_name}: #{result}")

  unless exit_status == 0
    exception_message = "Hook #{hook} for #{job_template_name} failed "
    exception_message += "(exit: #{exit_status}) "
    exception_message += " stderr: #{error_output}, stdout: #{result}"
    logger.info(exception_message)

    raise Bosh::Agent::MessageHandlerError, exception_message
  end
  result
end

.unpack_blob(blobstore_id, sha1, install_path) ⇒ Object 



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# File 'lib/bosh_agent/util.rb', line 16

def unpack_blob(blobstore_id, sha1, install_path)
  bsc_options = Bosh::Agent::Config.blobstore_options
  bsc_provider = Bosh::Agent::Config.blobstore_provider
  blobstore_client = Bosh::Blobstore::Client.safe_create(bsc_provider, bsc_options)

  data_tmp = File.join(base_dir, 'data', 'tmp')
  FileUtils.mkdir_p(data_tmp)

  begin
    tf = Tempfile.open(blobstore_id, data_tmp)

    begin
      logger.info("Retrieving blob '#{blobstore_id}'")
      blobstore_client.get(blobstore_id, tf, sha1: sha1)
    rescue Bosh::Blobstore::BlobstoreError => e
      raise Bosh::Agent::MessageHandlerError.new(e.inspect)
    end

    partial_install_path = "#{install_path}-bosh-agent-unpack"
    logger.info("Creating '#{partial_install_path}'")
    FileUtils.rm_rf(partial_install_path)
    FileUtils.mkdir_p(partial_install_path)

    logger.info("Installing to '#{partial_install_path}'")
    Dir.chdir(partial_install_path) do
      output = `tar --no-same-owner -zxvf #{tf.path} 2>&1`
      unless $?.exitstatus == 0
        raise Bosh::Agent::MessageHandlerError.new('Failed to unpack blob', output)
      end
    end

    # Only move contents of the blob to install path at the end
    # to avoid corrupted package directory
    FileUtils.mv(partial_install_path, install_path)
  rescue Exception => e
    logger.info("Failure unpacking blob: #{e.inspect} #{e.backtrace}")
    raise e
  ensure
    if tf
      tf.close
      tf.unlink
    end
  end
end

.update_file(data, path) ⇒ Object

Poor mans idempotency



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# File 'lib/bosh_agent/util.rb', line 145

def update_file(data, path)
  name = File.basename(path)
  dir = File.dirname(path)

  if_tmp_file = Tempfile.new(name, dir)
  if_tmp_file.write(data)
  if_tmp_file.flush

  old = nil
  begin
    old = Digest::SHA1.file(path).hexdigest
  rescue Errno::ENOENT
    logger.debug("missing file: #{path}")
  end
  new = Digest::SHA1.file(if_tmp_file.path).hexdigest

  updated = false
  unless old == new
    FileUtils.cp(if_tmp_file.path, path)
    updated = true
  end
  updated
ensure
  if if_tmp_file
     if_tmp_file.close
     FileUtils.rm_rf(if_tmp_file.path)
  end
end