objectLayer: Check for format.json in a wrapped disk. (#3311)

This is needed to validate if the `format.json` indeed exists
when a fresh node is brought online.

This wrapped implementation also connects to the remote node
by attempting a re-login. Subsequently after a successful
connect `format.json` is validated as well.

Fixes #3207

cmd/server-main.go

@@ -363,6 +363,9 @@ func serverMain(c *cli.Context) {
 		cli.ShowCommandHelpAndExit(c, "server", 1)
 	}
 
+	// Set global quiet flag.
+	globalQuiet = c.Bool("quiet") || c.GlobalBool("quiet")
+
 	// Server address.
 	serverAddr := c.String("address")
 
@@ -391,7 +394,7 @@ func serverMain(c *cli.Context) {
 	fatalIf(err, "Unable to parse storage endpoints %s", c.Args())
 
 	storageDisks, err := initStorageDisks(endpoints)
-	fatalIf(err, "Unable to initialize storage disks.")
+	fatalIf(err, "Unable to initialize storage disk(s).")
 
 	// Cleanup objects that weren't successfully written into the namespace.
 	fatalIf(houseKeeping(storageDisks), "Unable to purge temporary files.")
@@ -451,11 +454,11 @@ func serverMain(c *cli.Context) {
 	}(tls)
 
 	// Wait for formatting of disks.
-	err = waitForFormatDisks(firstDisk, endpoints, storageDisks)
+	formattedDisks, err := waitForFormatDisks(firstDisk, endpoints, storageDisks)
 	fatalIf(err, "formatting storage disks failed")
 
 	// Once formatted, initialize object layer.
-	newObject, err := newObjectLayer(storageDisks)
+	newObject, err := newObjectLayer(formattedDisks)
 	fatalIf(err, "intializing object layer failed")
 
 	globalObjLayerMutex.Lock()