More stronger way to detect physical data storage devices (with fixs for KVM)

Change-Id: Ia5f400a6ce137ae21e0ce99095856959039b6d41

bin/agent

@@ -224,7 +224,7 @@ class NodeAgent
 
     begin
       (@os[:block_device] or {} rescue {}).each do |bname, binfo|
-        if /^(sd|vd|hd|cciss|xvd).+$/ =~ bname and binfo
+        if physical_data_storage_devices.include?(bname) && binfo
           dname = bname.gsub(/!/, '/')
           # 512 bytes is the size of one sector by default
           block_size = 512
@@ -252,6 +252,33 @@ class NodeAgent
     basepath.split("/")[2..-1].join("/") if basepath
   end
 
+  def physical_data_storage_devices
+    @blocks ||= []
+    return @blocks unless @blocks.empty?
+
+    raise "Path /sys/block does not exist" unless File.exists?("/sys/block")
+
+    Dir["/sys/block/*"].each do |block_device_dir|
+      basename_dir = File.basename(block_device_dir)
+
+      properties = `udevadm info --query=property --export --name=#{basename_dir}`.inject({}) do |result, raw_propety|
+       key, value = raw_propety.split(/\=/)
+       result.update(key.strip => value.strip.chomp("'").reverse.chomp("'").reverse)
+      end
+
+      if File.exists?("/sys/block/#{basename_dir}/removable")
+        removable = File.open("/sys/block/#{basename_dir}/removable"){ |f| f.read_nonblock(1024).strip }
+      end
+      # look at https://github.com/torvalds/linux/blob/master/Documentation/devices.txt
+      # KVM virtio volumes has code 252 in CentOS, but 253 in Ubuntu
+      if [3, 8, 202, 252, 253].include?(properties['MAJOR'].to_i) && removable =~ /^0$/
+        # Exclude LVM volumes (in CentOS - 253, in Ubuntu - 252) using additional check
+        @blocks << basename_dir unless properties['DEVPATH'].include?('virtual')
+      end
+    end
+    @blocks
+  end
+
   def _is_virtualbox
     @os[:dmi][:system][:product_name] == "VirtualBox" rescue false
   end