mkdonut now creates a donut processing cli args

Makefile

@@ -34,6 +34,7 @@ cyclo:
 gomake-all: getdeps verifiers
 	@echo "Installing minio:"
 	@go run make.go install
+	@go run cmd/mkdonut/make.go install
 
 release: getdeps verifiers
 	@echo "Installing minio:"

cmd/mkdonut/.gitignore

@@ -0,0 +1 @@
+mkdonut

cmd/mkdonut/disks.go

@@ -17,22 +17,21 @@
 package main
 
 import (
-	"errors"
+	"fmt"
 	"io/ioutil"
 	"os"
-	"path/filepath"
 	"syscall"
 
 	"github.com/minio/minio/pkg/iodine"
 )
 
-// IsUsable provides a comprehensive way of knowing if the provided mountPath is mounted and writable
-func IsUsable(mountPath string) (bool, error) {
+// isUsable provides a comprehensive way of knowing if the provided mountPath is mounted and writable
+func isUsable(mountPath string) (bool, error) {
 	mntpoint, err := os.Stat(mountPath)
 	if err != nil {
 		return false, iodine.New(err, nil)
 	}
-	parent, err := os.Stat(filepath.Join(mountPath, ".."))
+	parent, err := os.Stat("/")
 	if err != nil {
 		return false, iodine.New(err, nil)
 	}
@@ -40,7 +39,7 @@ func IsUsable(mountPath string) (bool, error) {
 	parentSt := parent.Sys().(*syscall.Stat_t)
 
 	if mntpointSt.Dev == parentSt.Dev {
-		return false, iodine.New(errors.New("not mounted"), nil)
+		return false, iodine.New(fmt.Errorf("Not mounted %s", mountPath), nil)
 	}
 	testFile, err := ioutil.TempFile(mountPath, "writetest-")
 	if err != nil {

cmd/mkdonut/main.go

@@ -20,12 +20,14 @@ import (
 	"fmt"
 	"os"
 	"os/user"
+	"path/filepath"
 	"runtime"
 	"strconv"
 	"time"
 
 	"github.com/dustin/go-humanize"
 	"github.com/minio/cli"
+	"github.com/minio/minio/pkg/donut"
 	"github.com/minio/minio/pkg/iodine"
 )
 
@@ -72,6 +74,50 @@ func getSystemData() map[string]string {
 	}
 }
 
+func runMkdonut(c *cli.Context) {
+	if !c.Args().Present() || c.Args().First() == "help" {
+		cli.ShowAppHelp(c)
+		os.Exit(1)
+	}
+	donutName := c.Args().First()
+	if c.Args().First() != "" {
+		if !donut.IsValidDonut(donutName) {
+			Fatalf("Invalid donutname %s\n", donutName)
+		}
+	}
+	var disks []string
+	for _, disk := range c.Args().Tail() {
+		if _, err := isUsable(disk); err != nil {
+			Fatalln(err)
+		}
+		disks = append(disks, disk)
+	}
+	for _, disk := range disks {
+		if err := os.MkdirAll(filepath.Join(disk, donutName), 0700); err != nil {
+			Fatalln(err)
+		}
+	}
+
+	hostname, err := os.Hostname()
+	if err != nil {
+		Fatalln(err)
+	}
+	donutConfig := &donut.Config{}
+	donutConfig.Version = "0.0.1"
+	donutConfig.DonutName = donutName
+	donutConfig.NodeDiskMap = make(map[string][]string)
+	// keep it in exact order as it was specified, do not try to sort disks
+	donutConfig.NodeDiskMap[hostname] = disks
+	// default cache is unlimited
+	donutConfig.MaxSize = 0
+
+	if err := donut.SaveConfig(donutConfig); err != nil {
+		Fatalln(err)
+	}
+
+	Infoln("Success!")
+}
+
 func main() {
 	// set up iodine
 	iodine.SetGlobalState("mkdonut.version", Version)
@@ -82,7 +128,8 @@ func main() {
 
 	// set up app
 	app := cli.NewApp()
-	app.Name = "minio"
+	app.Action = runMkdonut
+	app.Name = "mkdonut"
 	app.Version = Version
 	app.Compiled = getVersion()
 	app.Author = "Minio.io"

pkg/donut/common.go

@@ -28,6 +28,22 @@ import (
 	"github.com/minio/minio/pkg/utils/atomic"
 )
 
+// IsValidDonut - verify donut name is correct
+func IsValidDonut(donutName string) bool {
+	if len(donutName) < 3 || len(donutName) > 63 {
+		return false
+	}
+	if donutName[0] == '.' || donutName[len(donutName)-1] == '.' {
+		return false
+	}
+	if match, _ := regexp.MatchString("\\.\\.", donutName); match == true {
+		return false
+	}
+	// We don't support donutNames with '.' in them
+	match, _ := regexp.MatchString("^[a-zA-Z][a-zA-Z0-9\\-]+[a-zA-Z0-9]$", donutName)
+	return match
+}
+
 // IsValidBucket - verify bucket name in accordance with
 //  - http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingBucket.html
 func IsValidBucket(bucket string) bool {