Add filesystem factory functions and add related cli options

main.go

@@ -42,6 +42,7 @@ var commands = []cli.Command{
 
 var modeCommands = []cli.Command{
 	memoryCmd,
+	fsCmd,
 	donutCmd,
 }
 
@@ -70,6 +71,23 @@ EXAMPLES:
 `,
 }
 
+var fsCmd = cli.Command{
+	Name:        "fs",
+	Description: "Specify a path to instantiate filesystem driver",
+	Action:      runFilesystem,
+	CustomHelpTemplate: `NAME:
+  minio mode {{.Name}} - {{.Description}}
+
+USAGE:
+  minio mode {{.Name}} limit SIZE expire TIME
+
+EXAMPLES:
+  1. Export an existing filesystem path
+      $ minio mode {{.Name}} /var/www
+
+`,
+}
+
 var donutCmd = cli.Command{
 	Name:        "donut",
 	Description: "Specify a path to instantiate donut",
@@ -204,7 +222,6 @@ func runDonut(c *cli.Context) {
 	if len(c.Args()) < 1 {
 		cli.ShowCommandHelpAndExit(c, "donut", 1) // last argument is exit code
 	}
-
 	// supporting multiple paths
 	var paths []string
 	if strings.TrimSpace(c.Args().First()) == "" {
@@ -226,6 +243,21 @@ func runDonut(c *cli.Context) {
 	server.StartMinio(servers)
 }
 
+func runFilesystem(c *cli.Context) {
+	if len(c.Args()) != 1 {
+		cli.ShowCommandHelpAndExit(c, "fs", 1) // last argument is exit code
+	}
+	apiServerConfig := getAPIServerConfig(c)
+	fsDriver := server.FilesystemFactory{
+		Config: apiServerConfig,
+		Path:   c.Args()[0],
+	}
+	apiServer := fsDriver.GetStartServerFunc()
+	webServer := getWebServerConfigFunc(c)
+	servers := []server.StartServerFunc{apiServer, webServer}
+	server.StartMinio(servers)
+}
+
 func getAPIServerConfig(c *cli.Context) httpserver.Config {
 	certFile := c.String("cert")
 	keyFile := c.String("key")