public static void ImportToEtcd(KeyValueData data)
        {
            string etcdUrl = $"http://{data.EtcdHost}:{data.EtcdPort}";

            $"Import to etcd {etcdUrl}".OutUnderline();

            using (var client = new EtcdClient(etcdUrl))
            {
                "Replace key-value tree".OutUnderline();
                client.DeleteRange("cfg/");

                foreach (var kv in data.Tree)
                {
                    kv.Key.Out();
                    client.Put(kv.Key, kv.Value);
                }

                "Delete users & roles".OutUnderline();
                var users = client
                            .UserList(new Etcdserverpb.AuthUserListRequest())
                            .Users
                            .ToList();

                foreach (var name in users)
                {
                    if (name != "root")
                    {
                        var reqDelUsr = new Etcdserverpb.AuthUserDeleteRequest()
                        {
                            Name = name
                        };
                        client.UserDelete(reqDelUsr);
                        $"User {name} deleted".Out();
                    }
                }

                var roles = client
                            .RoleList(new Etcdserverpb.AuthRoleListRequest())
                            .Roles
                            .ToList();

                foreach (var name in roles)
                {
                    if (name != "root")
                    {
                        var reqDelRole = new Etcdserverpb.AuthRoleDeleteRequest()
                        {
                            Role = name
                        };
                        client.RoleDelete(reqDelRole);
                        $"Role {name} deleted".Out();
                    }
                }

                "Create roles".OutUnderline();

                int i        = 0;
                var rolesDic = new Dictionary <string, string>(); // access vs role_name

                data.Users
                .Select(x => x.Access)
                .Distinct()
                .ToList()
                .ForEach(x =>
                {
                    string roleName = $"role{++i}";

                    var reqRoleAdd = new Etcdserverpb.AuthRoleAddRequest()
                    {
                        Name = roleName
                    };
                    client.RoleAdd(reqRoleAdd);
                    $"Role {roleName} created".Out();

                    var reqAddPerm = new Etcdserverpb.AuthRoleGrantPermissionRequest()
                    {
                        Name = roleName,
                        Perm = new Authpb.Permission()
                        {
                            Key      = Google.Protobuf.ByteString.CopyFromUtf8($"cfg/{x}"),
                            RangeEnd = Google.Protobuf.ByteString.CopyFromUtf8($"cfg/{x}"),
                            PermType = Authpb.Permission.Types.Type.Read
                        }
                    };
                    client.RoleGrantPermission(reqAddPerm);
                    $"Readonly access to cfg/{x} granted".Out();

                    reqAddPerm = new Etcdserverpb.AuthRoleGrantPermissionRequest()
                    {
                        Name = roleName,
                        Perm = new Authpb.Permission()
                        {
                            Key      = Google.Protobuf.ByteString.CopyFromUtf8($"app/{x}"),
                            RangeEnd = Google.Protobuf.ByteString.CopyFromUtf8($"app/{x}"),
                            PermType = Authpb.Permission.Types.Type.Readwrite
                        }
                    };
                    client.RoleGrantPermission(reqAddPerm);
                    $"Readwrite access to app/{x} granted".Out();

                    rolesDic[x] = roleName;
                });

                "Create users and grant roles".OutUnderline();

                foreach (var user in data.Users)
                {
                    var reqAddUsr = new Etcdserverpb.AuthUserAddRequest()
                    {
                        Name     = user.Name,
                        Password = user.Password
                    };

                    client.UserAdd(reqAddUsr);
                    $"User {user.Name} created".Out();

                    var reqGrantRole = new Etcdserverpb.AuthUserGrantRoleRequest()
                    {
                        User = user.Name,
                        Role = rolesDic[user.Access]
                    };
                    client.UserGrantRole(reqGrantRole);
                    $"Access to {user.Access} granted ({rolesDic[user.Access]})".Out();
                }
            }
        }