Move parsers into util

pkg/util/parsers/parsers.go

@@ -0,0 +1,36 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 parsers
+
+import (
+	"github.com/docker/docker/pkg/parsers"
+)
+
+const (
+	defaultImageTag = "latest"
+)
+
+// parseImageName parses a docker image string into two parts: repo and tag.
+// If tag is empty, return the defaultImageTag.
+func ParseImageName(image string) (string, string) {
+	repoToPull, tag := parsers.ParseRepositoryTag(image)
+	// If no tag was specified, use the default "latest".
+	if len(tag) == 0 {
+		tag = defaultImageTag
+	}
+	return repoToPull, tag
+}