func RunExternalAndStdout(cmd, wd string, argv []string) (stdout []byte, err os.Error) {
argv = SplitArgs(argv)
var c *exec.Cmd
if len(argv) > 0 {
c = exec.Command(cmd, argv...)
} else {
c = exec.Command(cmd)
}
c.Dir = wd
c.Env = os.Environ()
bStdout := bytes.NewBuffer(nil)
bStderr := bytes.NewBuffer(nil)
c.Stdout = bStdout
c.Stderr = bStderr
err = c.Run()
if wmsg, ok := err.(*os.Waitmsg); ok {
if wmsg.ExitStatus() != 0 {
err = os.NewError(fmt.Sprintf("command: %s %v\n%s\n", cmd, argv, bStderr.String()))
} else {
err = nil
}
} else {
stdout = bStdout.Bytes()
}
return
}