Add logger command - also migrate from old config to newer config

config-main.go

@@ -0,0 +1,53 @@
+/*
+ * Minio Cloud Storage, (C) 2015 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 main
+
+import "github.com/minio/cli"
+
+//   Configure minio server
+//
+//   ----
+//   NOTE: that the configure command only writes values to the config file.
+//   It does not use any configuration values from the environment variables.
+//   ----
+//
+var configCmd = cli.Command{
+	Name:   "config",
+	Usage:  "Collection of config management commands.",
+	Action: mainConfig,
+	Subcommands: []cli.Command{
+		configLoggerCmd,
+		configVersionCmd,
+	},
+	CustomHelpTemplate: `NAME:
+  {{.Name}} - {{.Usage}}
+
+USAGE:
+  {{.Name}} {{if .Flags}}[global flags] {{end}}command{{if .Flags}} [command flags]{{end}} [arguments...]
+
+COMMANDS:
+  {{range .Commands}}{{ .Name }}{{ "\t" }}{{.Usage}}
+  {{end}}
+`,
+}
+
+// mainConfig is the handle for "minio config" command. provides sub-commands which write configuration data in json format to config file.
+func mainConfig(ctx *cli.Context) {
+	if !ctx.Args().Present() || ctx.Args().First() == "help" {
+		cli.ShowAppHelp(ctx)
+	}
+}