server: Move all the top level files into cmd folder. (#2490)

This change brings a change which was done for the 'mc'
package to allow for clean repo and have a cleaner
github drop in experience.

cmd/posix-prepare-path.go

@@ -0,0 +1,56 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 cmd
+
+import (
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+// preparePath rewrites path to handle any OS specific details.
+func preparePath(path string) string {
+	if runtime.GOOS == "windows" {
+		// Microsoft Windows supports long path names using
+		// uniform naming convention (UNC).
+		return UNCPath(path)
+	}
+	return path
+}
+
+// UNCPath converts a absolute windows path to a UNC long path.
+func UNCPath(path string) string {
+	// Clean the path for any trailing "/".
+	path = filepath.Clean(path)
+
+	// UNC can NOT use "/", so convert all to "\".
+	path = filepath.FromSlash(path)
+
+	// If prefix is "\\", we already have a UNC path or server.
+	if strings.HasPrefix(path, `\\`) {
+
+		// If already long path, just keep it
+		if strings.HasPrefix(path, `\\?\`) {
+			return path
+		}
+
+		// Trim "\\" from path and add UNC prefix.
+		return `\\?\UNC\` + strings.TrimPrefix(path, `\\`)
+	}
+	path = `\\?\` + path
+	return path
+}