implement interface for linux

lib/resources/interface.rb

@@ -0,0 +1,51 @@
+# encoding: utf-8
+# author: Christoph Hartmann
+# author: Dominik Richter
+
+# Usage:
+# describe interface('eth0') do
+#   it { should exist }
+#   it { should be_up }
+#   its(:speed) { should eq 1000 }
+# end
+
+require 'utils/convert'
+
+class NetworkInterface < Vulcano.resource(1)
+  include Converter
+
+  name 'interface'
+
+  def initialize(iface)
+    @iface = iface
+    @cache = nil
+  end
+
+  def exists?
+    !interface_info.nil?
+  end
+
+  def up?
+    return false if interface_info.nil? || !interface_info.key?('operstate')
+    key, _value = interface_info['operstate'].first
+    key == 'up'
+  end
+
+  def speed
+    return nil if interface_info.nil? || !interface_info.key?('speed')
+    key, _value = interface_info['speed'].first
+    convert_to_i(key)
+  end
+
+  private
+
+  def interface_info
+    return @cache if !@cache.nil?
+    # will return "[mtu]\n1500\n[type]\n1"
+    cmd = vulcano.command("find /sys/class/net/#{@iface}/ -type f -maxdepth 1 -exec sh -c 'echo \"[$(basename {})]\"; cat {} || echo -n' \\;")
+    return nil if cmd.exit_status.to_i != 0
+
+    # parse values, we only recieve values, therefore we threat them as keys
+    @cache = SimpleConfig.new(cmd.stdout.chomp).params
+  end
+end

lib/vulcano/resource.rb

@@ -34,6 +34,7 @@ require 'resources/gem'
 require 'resources/group'
 require 'resources/group_policy'
 require 'resources/inetd_conf'
+require 'resources/interface'
 require 'resources/json'
 require 'resources/kernel_module'
 require 'resources/kernel_parameter'