try to support windows

main.go

@@ -23,6 +23,8 @@ import (
 	ma "github.com/jbenet/go-multiaddr-net/Godeps/_workspace/src/github.com/jbenet/go-multiaddr"
 )
 
+var setupOpt = func(cmd *exec.Cmd) {}
+
 // GetNumNodes returns the number of testbed nodes configured in the testbed directory
 func GetNumNodes() int {
 	for i := 0; i < 2000; i++ {
@@ -279,7 +281,7 @@ func IpfsStart(waitall bool) error {
 		cmd.Dir = dir
 		cmd.Env = envForDaemon(i)
 
-		cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
+		setupOpt(cmd)
 
 		stdout, err := os.Create(path.Join(dir, "daemon.stdout"))
 		if err != nil {
@@ -602,6 +604,11 @@ func main() {
 	kingpin.Arg("args", "arguments").StringsVar(&args)
 	kingpin.Parse()
 
+	if len(args) == 0 {
+		kingpin.Usage()
+		return
+	}
+
 	switch args[0] {
 	case "init":
 		if cfg.Count == 0 {

proc_unix.go

@@ -0,0 +1,13 @@
+// +build !windows
+package main
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+func init() {
+	setupOpt = func(cmd *exec.Cmd) {
+		cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
+	}
+}