Module: Ohai::Mixin::OCIMetadata

Defined in:
lib/ohai/mixin/oci_metadata.rb

Constant Summary collapse

OCI_METADATA_ADDR = 
"169.254.169.254"
OCI_METADATA_URL = 
"/opc/v2"
CHASSIS_ASSET_TAG_FILE = 
"/sys/devices/virtual/dmi/id/chassis_asset_tag"

Instance Method Summary collapse

Instance Method Details

#chassis_asset_tag ⇒ Object

Get the chassis asset tag from DMI information On Linux: reads from sysfs On Windows: queries WMI Win32_SystemEnclosure



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# File 'lib/ohai/mixin/oci_metadata.rb', line 34

def chassis_asset_tag
  if RUBY_PLATFORM =~ /mswin|mingw|windows/
    get_chassis_asset_tag_windows
  else
    get_chassis_asset_tag_linux
  end
end

#fetch_metadata(metadata = "instance") ⇒ Object

Fetch metadata from api



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# File 'lib/ohai/mixin/oci_metadata.rb', line 78

def fetch_metadata(metadata = "instance")
  response = http_get("#{OCI_METADATA_URL}/#{metadata}")
  if response.code == "200"
    json_data = parse_json(response.body)
    if json_data.nil?
      logger.warn("Mixin OciMetadata: Metadata response is NOT valid JSON")
    end
    json_data
  else
    logger.debug("Mixin OciMetadata: Received response code #{response.code} requesting #{metadata}")
    nil
  end
end

#get_chassis_asset_tag_linux ⇒ Object

Read chassis asset tag from Linux sysfs



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# File 'lib/ohai/mixin/oci_metadata.rb', line 43

def get_chassis_asset_tag_linux
  return unless ::File.exist?(CHASSIS_ASSET_TAG_FILE)

  ::File.read(CHASSIS_ASSET_TAG_FILE).strip
rescue => e
  logger.debug("Mixin OciMetadata: Failed to read chassis asset tag from #{CHASSIS_ASSET_TAG_FILE}: #{e}")
  nil
end

#get_chassis_asset_tag_windows ⇒ Object

Read chassis asset tag from Windows WMI



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# File 'lib/ohai/mixin/oci_metadata.rb', line 53

def get_chassis_asset_tag_windows
  require "wmi-lite/wmi" unless defined?(WmiLite::Wmi)

  wmi = WmiLite::Wmi.new
  enclosure = wmi.first_of("Win32_SystemEnclosure")
  enclosure&.[]("SMBIOSAssetTag")
rescue => e
  logger.debug("Mixin OciMetadata: Failed to read chassis asset tag from WMI: #{e}")
  nil
end

#http_get(uri) ⇒ Object

fetch the meta content with a timeout and the required header



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# File 'lib/ohai/mixin/oci_metadata.rb', line 65

def http_get(uri)
  conn = Net::HTTP.start(OCI_METADATA_ADDR)
  conn.read_timeout = 6
  conn.get(
    uri,
    {
      "Authorization" => "Bearer Oracle",
      "User-Agent" => "chef-ohai/#{Ohai::VERSION}",
    }
  )
end