Add a get_snapshot_details request method, a corresponding mock, and add support for it in the block storage provider.

lib/fog/hp/block_storage.rb

@@ -20,6 +20,7 @@ module Fog
 
       request :create_snapshot
       request :list_snapshots
+      request :get_snapshot_details
 
       module Utils
 

lib/fog/hp/requests/block_storage/get_snapshot_details.rb

@@ -0,0 +1,54 @@
+module Fog
+  module BlockStorage
+    class HP
+      class Real
+
+        # Get details for existing block storage snapshot
+        #
+        # ==== Parameters
+        # * snapshot_id<~Integer> - Id of the snapshot to get
+        #
+        # ==== Returns
+        # * response<~Excon::Response>:
+        #   * body<~Hash>:
+        #     * snapshot<~Hash>:
+        #       * 'id'<~Integer>: - Id for the snapshot
+        #       * 'displayName'<~String>: - Name of the snapshot
+        #       * 'displayDescription'<~String>: - Description of the snapshot
+        #       * 'size'<~Integer>: - Size in GB for the snapshot
+        #       * 'status'<~String>: - Status of the snapshot i.e. "available"
+        #       * 'volumeId'<~Integer>: - Id of the volume from which the snapshot was created
+        #       * 'createdAt'<~String>: - Timestamp in UTC when volume was created
+
+        def get_snapshot_details(snapshot_id)
+          response = request(
+            :expects  => 200,
+            :method   => 'GET',
+            :path     => "os-snapshots/#{snapshot_id}"
+          )
+          response
+        end
+
+      end
+
+      class Mock  # :nodoc:all
+
+        def get_snapshot_details(snapshot_id)
+          unless snapshot_id
+            raise ArgumentError.new('snapshot_id is required')
+          end
+          response = Excon::Response.new
+          if snapshot = self.data[:snapshots][snapshot_id]
+            response.status = 200
+            response.body = { 'snapshot' => snapshot }
+            response
+          else
+            raise Fog::BlockStorage::HP::NotFound
+          end
+
+        end
+      end
+
+    end
+  end
+end