Rename pkg/{tagging,lifecycle} to pkg/bucket sub-directory (#8892)

Rename to allow for more such features to come in a more
proper hierarchical manner.

pkg/bucket/lifecycle/transition.go

@@ -0,0 +1,43 @@
+/*
+ * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package lifecycle
+
+import (
+	"encoding/xml"
+	"errors"
+)
+
+// Transition - transition actions for a rule in lifecycle configuration.
+type Transition struct {
+	XMLName      xml.Name `xml:"Transition"`
+	Days         int      `xml:"Days,omitempty"`
+	Date         string   `xml:"Date,omitempty"`
+	StorageClass string   `xml:"StorageClass"`
+}
+
+var errTransitionUnsupported = errors.New("Specifying <Transition></Transition> tag is not supported")
+
+// UnmarshalXML is extended to indicate lack of support for Transition
+// xml tag in object lifecycle configuration
+func (t Transition) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	return errTransitionUnsupported
+}
+
+// MarshalXML is extended to leave out <Transition></Transition> tags
+func (t Transition) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
+	return nil
+}