diff --git a/go/gitalypb/blob.pb.go b/go/gitalypb/blob.pb.go
index 20085a3f86b727b80469bf803fda93e068c3a9f9..c086379fbf19451fe62f23e3faf52784bbb7d9a8 100644
--- a/go/gitalypb/blob.pb.go
+++ b/go/gitalypb/blob.pb.go
@@ -136,6 +136,8 @@ It has these top-level messages:
 	UserCreateTagResponse
 	UserMergeBranchRequest
 	UserMergeBranchResponse
+	UserMergeToRefRequest
+	UserMergeToRefResponse
 	OperationBranchUpdate
 	UserFFBranchRequest
 	UserFFBranchResponse
diff --git a/go/gitalypb/operations.pb.go b/go/gitalypb/operations.pb.go
index cdfbba8974ab154f7f940a206187fe7450e02d22..45f93c3ba8c4981d5da46fac01a524dcf74f2d6a 100644
--- a/go/gitalypb/operations.pb.go
+++ b/go/gitalypb/operations.pb.go
@@ -49,7 +49,7 @@ func (x UserCommitFilesActionHeader_ActionType) String() string {
 	return proto.EnumName(UserCommitFilesActionHeader_ActionType_name, int32(x))
 }
 func (UserCommitFilesActionHeader_ActionType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor8, []int{19, 0}
+	return fileDescriptor8, []int{21, 0}
 }
 
 type UserCreateBranchRequest struct {
@@ -453,6 +453,92 @@ func (m *UserMergeBranchResponse) GetPreReceiveError() string {
 	return ""
 }
 
+type UserMergeToRefRequest struct {
+	Repository *Repository `protobuf:"bytes,1,opt,name=repository" json:"repository,omitempty"`
+	User       *User       `protobuf:"bytes,2,opt,name=user" json:"user,omitempty"`
+	SourceSha  string      `protobuf:"bytes,3,opt,name=source_sha,json=sourceSha" json:"source_sha,omitempty"`
+	Branch     []byte      `protobuf:"bytes,4,opt,name=branch,proto3" json:"branch,omitempty"`
+	// The merge of source_sha and branch has target_ref as target.
+	//
+	// The target_ref is _always_ overwritten when merging source_sha
+	// and branch. That is, if a second request comes in, target_ref
+	// will lose its previous state and be updated to the latest merge
+	// between source_sha and branch.
+	TargetRef []byte `protobuf:"bytes,5,opt,name=target_ref,json=targetRef,proto3" json:"target_ref,omitempty"`
+	Message   []byte `protobuf:"bytes,6,opt,name=message,proto3" json:"message,omitempty"`
+}
+
+func (m *UserMergeToRefRequest) Reset()                    { *m = UserMergeToRefRequest{} }
+func (m *UserMergeToRefRequest) String() string            { return proto.CompactTextString(m) }
+func (*UserMergeToRefRequest) ProtoMessage()               {}
+func (*UserMergeToRefRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{12} }
+
+func (m *UserMergeToRefRequest) GetRepository() *Repository {
+	if m != nil {
+		return m.Repository
+	}
+	return nil
+}
+
+func (m *UserMergeToRefRequest) GetUser() *User {
+	if m != nil {
+		return m.User
+	}
+	return nil
+}
+
+func (m *UserMergeToRefRequest) GetSourceSha() string {
+	if m != nil {
+		return m.SourceSha
+	}
+	return ""
+}
+
+func (m *UserMergeToRefRequest) GetBranch() []byte {
+	if m != nil {
+		return m.Branch
+	}
+	return nil
+}
+
+func (m *UserMergeToRefRequest) GetTargetRef() []byte {
+	if m != nil {
+		return m.TargetRef
+	}
+	return nil
+}
+
+func (m *UserMergeToRefRequest) GetMessage() []byte {
+	if m != nil {
+		return m.Message
+	}
+	return nil
+}
+
+type UserMergeToRefResponse struct {
+	CommitId        string `protobuf:"bytes,1,opt,name=commit_id,json=commitId" json:"commit_id,omitempty"`
+	PreReceiveError string `protobuf:"bytes,2,opt,name=pre_receive_error,json=preReceiveError" json:"pre_receive_error,omitempty"`
+}
+
+func (m *UserMergeToRefResponse) Reset()                    { *m = UserMergeToRefResponse{} }
+func (m *UserMergeToRefResponse) String() string            { return proto.CompactTextString(m) }
+func (*UserMergeToRefResponse) ProtoMessage()               {}
+func (*UserMergeToRefResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{13} }
+
+func (m *UserMergeToRefResponse) GetCommitId() string {
+	if m != nil {
+		return m.CommitId
+	}
+	return ""
+}
+
+func (m *UserMergeToRefResponse) GetPreReceiveError() string {
+	if m != nil {
+		return m.PreReceiveError
+	}
+	return ""
+}
+
 type OperationBranchUpdate struct {
 	// If this string is non-empty the branch has been updated.
 	CommitId string `protobuf:"bytes,1,opt,name=commit_id,json=commitId" json:"commit_id,omitempty"`
@@ -465,7 +551,7 @@ type OperationBranchUpdate struct {
 func (m *OperationBranchUpdate) Reset()                    { *m = OperationBranchUpdate{} }
 func (m *OperationBranchUpdate) String() string            { return proto.CompactTextString(m) }
 func (*OperationBranchUpdate) ProtoMessage()               {}
-func (*OperationBranchUpdate) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{12} }
+func (*OperationBranchUpdate) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{14} }
 
 func (m *OperationBranchUpdate) GetCommitId() string {
 	if m != nil {
@@ -498,7 +584,7 @@ type UserFFBranchRequest struct {
 func (m *UserFFBranchRequest) Reset()                    { *m = UserFFBranchRequest{} }
 func (m *UserFFBranchRequest) String() string            { return proto.CompactTextString(m) }
 func (*UserFFBranchRequest) ProtoMessage()               {}
-func (*UserFFBranchRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{13} }
+func (*UserFFBranchRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{15} }
 
 func (m *UserFFBranchRequest) GetRepository() *Repository {
 	if m != nil {
@@ -536,7 +622,7 @@ type UserFFBranchResponse struct {
 func (m *UserFFBranchResponse) Reset()                    { *m = UserFFBranchResponse{} }
 func (m *UserFFBranchResponse) String() string            { return proto.CompactTextString(m) }
 func (*UserFFBranchResponse) ProtoMessage()               {}
-func (*UserFFBranchResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{14} }
+func (*UserFFBranchResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{16} }
 
 func (m *UserFFBranchResponse) GetBranchUpdate() *OperationBranchUpdate {
 	if m != nil {
@@ -565,7 +651,7 @@ type UserCherryPickRequest struct {
 func (m *UserCherryPickRequest) Reset()                    { *m = UserCherryPickRequest{} }
 func (m *UserCherryPickRequest) String() string            { return proto.CompactTextString(m) }
 func (*UserCherryPickRequest) ProtoMessage()               {}
-func (*UserCherryPickRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{15} }
+func (*UserCherryPickRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{17} }
 
 func (m *UserCherryPickRequest) GetRepository() *Repository {
 	if m != nil {
@@ -626,7 +712,7 @@ type UserCherryPickResponse struct {
 func (m *UserCherryPickResponse) Reset()                    { *m = UserCherryPickResponse{} }
 func (m *UserCherryPickResponse) String() string            { return proto.CompactTextString(m) }
 func (*UserCherryPickResponse) ProtoMessage()               {}
-func (*UserCherryPickResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{16} }
+func (*UserCherryPickResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{18} }
 
 func (m *UserCherryPickResponse) GetBranchUpdate() *OperationBranchUpdate {
 	if m != nil {
@@ -669,7 +755,7 @@ type UserRevertRequest struct {
 func (m *UserRevertRequest) Reset()                    { *m = UserRevertRequest{} }
 func (m *UserRevertRequest) String() string            { return proto.CompactTextString(m) }
 func (*UserRevertRequest) ProtoMessage()               {}
-func (*UserRevertRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{17} }
+func (*UserRevertRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{19} }
 
 func (m *UserRevertRequest) GetRepository() *Repository {
 	if m != nil {
@@ -730,7 +816,7 @@ type UserRevertResponse struct {
 func (m *UserRevertResponse) Reset()                    { *m = UserRevertResponse{} }
 func (m *UserRevertResponse) String() string            { return proto.CompactTextString(m) }
 func (*UserRevertResponse) ProtoMessage()               {}
-func (*UserRevertResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{18} }
+func (*UserRevertResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{20} }
 
 func (m *UserRevertResponse) GetBranchUpdate() *OperationBranchUpdate {
 	if m != nil {
@@ -775,7 +861,7 @@ type UserCommitFilesActionHeader struct {
 func (m *UserCommitFilesActionHeader) Reset()                    { *m = UserCommitFilesActionHeader{} }
 func (m *UserCommitFilesActionHeader) String() string            { return proto.CompactTextString(m) }
 func (*UserCommitFilesActionHeader) ProtoMessage()               {}
-func (*UserCommitFilesActionHeader) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{19} }
+func (*UserCommitFilesActionHeader) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{21} }
 
 func (m *UserCommitFilesActionHeader) GetAction() UserCommitFilesActionHeader_ActionType {
 	if m != nil {
@@ -829,7 +915,7 @@ type UserCommitFilesAction struct {
 func (m *UserCommitFilesAction) Reset()                    { *m = UserCommitFilesAction{} }
 func (m *UserCommitFilesAction) String() string            { return proto.CompactTextString(m) }
 func (*UserCommitFilesAction) ProtoMessage()               {}
-func (*UserCommitFilesAction) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{20} }
+func (*UserCommitFilesAction) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{22} }
 
 type isUserCommitFilesAction_UserCommitFilesActionPayload interface{ isUserCommitFilesAction_UserCommitFilesActionPayload() }
 
@@ -948,7 +1034,7 @@ type UserCommitFilesRequestHeader struct {
 func (m *UserCommitFilesRequestHeader) Reset()                    { *m = UserCommitFilesRequestHeader{} }
 func (m *UserCommitFilesRequestHeader) String() string            { return proto.CompactTextString(m) }
 func (*UserCommitFilesRequestHeader) ProtoMessage()               {}
-func (*UserCommitFilesRequestHeader) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{21} }
+func (*UserCommitFilesRequestHeader) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{23} }
 
 func (m *UserCommitFilesRequestHeader) GetRepository() *Repository {
 	if m != nil {
@@ -1016,7 +1102,7 @@ type UserCommitFilesRequest struct {
 func (m *UserCommitFilesRequest) Reset()                    { *m = UserCommitFilesRequest{} }
 func (m *UserCommitFilesRequest) String() string            { return proto.CompactTextString(m) }
 func (*UserCommitFilesRequest) ProtoMessage()               {}
-func (*UserCommitFilesRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{22} }
+func (*UserCommitFilesRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{24} }
 
 type isUserCommitFilesRequest_UserCommitFilesRequestPayload interface{ isUserCommitFilesRequest_UserCommitFilesRequestPayload() }
 
@@ -1134,7 +1220,7 @@ type UserCommitFilesResponse struct {
 func (m *UserCommitFilesResponse) Reset()                    { *m = UserCommitFilesResponse{} }
 func (m *UserCommitFilesResponse) String() string            { return proto.CompactTextString(m) }
 func (*UserCommitFilesResponse) ProtoMessage()               {}
-func (*UserCommitFilesResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{23} }
+func (*UserCommitFilesResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{25} }
 
 func (m *UserCommitFilesResponse) GetBranchUpdate() *OperationBranchUpdate {
 	if m != nil {
@@ -1170,7 +1256,7 @@ type UserRebaseRequest struct {
 func (m *UserRebaseRequest) Reset()                    { *m = UserRebaseRequest{} }
 func (m *UserRebaseRequest) String() string            { return proto.CompactTextString(m) }
 func (*UserRebaseRequest) ProtoMessage()               {}
-func (*UserRebaseRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{24} }
+func (*UserRebaseRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{26} }
 
 func (m *UserRebaseRequest) GetRepository() *Repository {
 	if m != nil {
@@ -1230,7 +1316,7 @@ type UserRebaseResponse struct {
 func (m *UserRebaseResponse) Reset()                    { *m = UserRebaseResponse{} }
 func (m *UserRebaseResponse) String() string            { return proto.CompactTextString(m) }
 func (*UserRebaseResponse) ProtoMessage()               {}
-func (*UserRebaseResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{25} }
+func (*UserRebaseResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{27} }
 
 func (m *UserRebaseResponse) GetRebaseSha() string {
 	if m != nil {
@@ -1267,7 +1353,7 @@ type UserSquashRequest struct {
 func (m *UserSquashRequest) Reset()                    { *m = UserSquashRequest{} }
 func (m *UserSquashRequest) String() string            { return proto.CompactTextString(m) }
 func (*UserSquashRequest) ProtoMessage()               {}
-func (*UserSquashRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{26} }
+func (*UserSquashRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{28} }
 
 func (m *UserSquashRequest) GetRepository() *Repository {
 	if m != nil {
@@ -1333,7 +1419,7 @@ type UserSquashResponse struct {
 func (m *UserSquashResponse) Reset()                    { *m = UserSquashResponse{} }
 func (m *UserSquashResponse) String() string            { return proto.CompactTextString(m) }
 func (*UserSquashResponse) ProtoMessage()               {}
-func (*UserSquashResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{27} }
+func (*UserSquashResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{29} }
 
 func (m *UserSquashResponse) GetSquashSha() string {
 	if m != nil {
@@ -1359,7 +1445,7 @@ type UserApplyPatchRequest struct {
 func (m *UserApplyPatchRequest) Reset()                    { *m = UserApplyPatchRequest{} }
 func (m *UserApplyPatchRequest) String() string            { return proto.CompactTextString(m) }
 func (*UserApplyPatchRequest) ProtoMessage()               {}
-func (*UserApplyPatchRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{28} }
+func (*UserApplyPatchRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{30} }
 
 type isUserApplyPatchRequest_UserApplyPatchRequestPayload interface{ isUserApplyPatchRequest_UserApplyPatchRequestPayload() }
 
@@ -1474,7 +1560,7 @@ func (m *UserApplyPatchRequest_Header) Reset()         { *m = UserApplyPatchRequ
 func (m *UserApplyPatchRequest_Header) String() string { return proto.CompactTextString(m) }
 func (*UserApplyPatchRequest_Header) ProtoMessage()    {}
 func (*UserApplyPatchRequest_Header) Descriptor() ([]byte, []int) {
-	return fileDescriptor8, []int{28, 0}
+	return fileDescriptor8, []int{30, 0}
 }
 
 func (m *UserApplyPatchRequest_Header) GetRepository() *Repository {
@@ -1505,7 +1591,7 @@ type UserApplyPatchResponse struct {
 func (m *UserApplyPatchResponse) Reset()                    { *m = UserApplyPatchResponse{} }
 func (m *UserApplyPatchResponse) String() string            { return proto.CompactTextString(m) }
 func (*UserApplyPatchResponse) ProtoMessage()               {}
-func (*UserApplyPatchResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{29} }
+func (*UserApplyPatchResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{31} }
 
 func (m *UserApplyPatchResponse) GetBranchUpdate() *OperationBranchUpdate {
 	if m != nil {
@@ -1526,7 +1612,7 @@ type UserUpdateSubmoduleRequest struct {
 func (m *UserUpdateSubmoduleRequest) Reset()                    { *m = UserUpdateSubmoduleRequest{} }
 func (m *UserUpdateSubmoduleRequest) String() string            { return proto.CompactTextString(m) }
 func (*UserUpdateSubmoduleRequest) ProtoMessage()               {}
-func (*UserUpdateSubmoduleRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{30} }
+func (*UserUpdateSubmoduleRequest) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{32} }
 
 func (m *UserUpdateSubmoduleRequest) GetRepository() *Repository {
 	if m != nil {
@@ -1579,7 +1665,7 @@ type UserUpdateSubmoduleResponse struct {
 func (m *UserUpdateSubmoduleResponse) Reset()                    { *m = UserUpdateSubmoduleResponse{} }
 func (m *UserUpdateSubmoduleResponse) String() string            { return proto.CompactTextString(m) }
 func (*UserUpdateSubmoduleResponse) ProtoMessage()               {}
-func (*UserUpdateSubmoduleResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{31} }
+func (*UserUpdateSubmoduleResponse) Descriptor() ([]byte, []int) { return fileDescriptor8, []int{33} }
 
 func (m *UserUpdateSubmoduleResponse) GetBranchUpdate() *OperationBranchUpdate {
 	if m != nil {
@@ -1615,6 +1701,8 @@ func init() {
 	proto.RegisterType((*UserCreateTagResponse)(nil), "gitaly.UserCreateTagResponse")
 	proto.RegisterType((*UserMergeBranchRequest)(nil), "gitaly.UserMergeBranchRequest")
 	proto.RegisterType((*UserMergeBranchResponse)(nil), "gitaly.UserMergeBranchResponse")
+	proto.RegisterType((*UserMergeToRefRequest)(nil), "gitaly.UserMergeToRefRequest")
+	proto.RegisterType((*UserMergeToRefResponse)(nil), "gitaly.UserMergeToRefResponse")
 	proto.RegisterType((*OperationBranchUpdate)(nil), "gitaly.OperationBranchUpdate")
 	proto.RegisterType((*UserFFBranchRequest)(nil), "gitaly.UserFFBranchRequest")
 	proto.RegisterType((*UserFFBranchResponse)(nil), "gitaly.UserFFBranchResponse")
@@ -1655,6 +1743,7 @@ type OperationServiceClient interface {
 	UserDeleteBranch(ctx context.Context, in *UserDeleteBranchRequest, opts ...grpc.CallOption) (*UserDeleteBranchResponse, error)
 	UserCreateTag(ctx context.Context, in *UserCreateTagRequest, opts ...grpc.CallOption) (*UserCreateTagResponse, error)
 	UserDeleteTag(ctx context.Context, in *UserDeleteTagRequest, opts ...grpc.CallOption) (*UserDeleteTagResponse, error)
+	UserMergeToRef(ctx context.Context, in *UserMergeToRefRequest, opts ...grpc.CallOption) (*UserMergeToRefResponse, error)
 	UserMergeBranch(ctx context.Context, opts ...grpc.CallOption) (OperationService_UserMergeBranchClient, error)
 	UserFFBranch(ctx context.Context, in *UserFFBranchRequest, opts ...grpc.CallOption) (*UserFFBranchResponse, error)
 	UserCherryPick(ctx context.Context, in *UserCherryPickRequest, opts ...grpc.CallOption) (*UserCherryPickResponse, error)
@@ -1719,6 +1808,15 @@ func (c *operationServiceClient) UserDeleteTag(ctx context.Context, in *UserDele
 	return out, nil
 }
 
+func (c *operationServiceClient) UserMergeToRef(ctx context.Context, in *UserMergeToRefRequest, opts ...grpc.CallOption) (*UserMergeToRefResponse, error) {
+	out := new(UserMergeToRefResponse)
+	err := grpc.Invoke(ctx, "/gitaly.OperationService/UserMergeToRef", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *operationServiceClient) UserMergeBranch(ctx context.Context, opts ...grpc.CallOption) (OperationService_UserMergeBranchClient, error) {
 	stream, err := grpc.NewClientStream(ctx, &_OperationService_serviceDesc.Streams[0], c.cc, "/gitaly.OperationService/UserMergeBranch", opts...)
 	if err != nil {
@@ -1880,6 +1978,7 @@ type OperationServiceServer interface {
 	UserDeleteBranch(context.Context, *UserDeleteBranchRequest) (*UserDeleteBranchResponse, error)
 	UserCreateTag(context.Context, *UserCreateTagRequest) (*UserCreateTagResponse, error)
 	UserDeleteTag(context.Context, *UserDeleteTagRequest) (*UserDeleteTagResponse, error)
+	UserMergeToRef(context.Context, *UserMergeToRefRequest) (*UserMergeToRefResponse, error)
 	UserMergeBranch(OperationService_UserMergeBranchServer) error
 	UserFFBranch(context.Context, *UserFFBranchRequest) (*UserFFBranchResponse, error)
 	UserCherryPick(context.Context, *UserCherryPickRequest) (*UserCherryPickResponse, error)
@@ -1985,6 +2084,24 @@ func _OperationService_UserDeleteTag_Handler(srv interface{}, ctx context.Contex
 	return interceptor(ctx, in, info, handler)
 }
 
+func _OperationService_UserMergeToRef_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(UserMergeToRefRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(OperationServiceServer).UserMergeToRef(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/gitaly.OperationService/UserMergeToRef",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(OperationServiceServer).UserMergeToRef(ctx, req.(*UserMergeToRefRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _OperationService_UserMergeBranch_Handler(srv interface{}, stream grpc.ServerStream) error {
 	return srv.(OperationServiceServer).UserMergeBranch(&operationServiceUserMergeBranchServer{stream})
 }
@@ -2195,6 +2312,10 @@ var _OperationService_serviceDesc = grpc.ServiceDesc{
 			MethodName: "UserDeleteTag",
 			Handler:    _OperationService_UserDeleteTag_Handler,
 		},
+		{
+			MethodName: "UserMergeToRef",
+			Handler:    _OperationService_UserMergeToRef_Handler,
+		},
 		{
 			MethodName: "UserFFBranch",
 			Handler:    _OperationService_UserFFBranch_Handler,
@@ -2244,114 +2365,119 @@ var _OperationService_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("operations.proto", fileDescriptor8) }
 
 var fileDescriptor8 = []byte{
-	// 1740 bytes of a gzipped FileDescriptorProto
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-	0x32, 0x5b, 0x42, 0x35, 0x4b, 0xe6, 0x80, 0x63, 0x46, 0xa4, 0xd8, 0x3c, 0x8c, 0xef, 0x2b, 0x25,
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+	0x00,
 }
diff --git a/operations.proto b/operations.proto
index 8efc9b3f5f3650a9de9aa9c7c83e9d65abe7500d..c14edc9ca4b37e76ed27f4316b7b8dbeedfd0c4e 100644
--- a/operations.proto
+++ b/operations.proto
@@ -10,6 +10,7 @@ service OperationService {
   rpc UserDeleteBranch(UserDeleteBranchRequest) returns (UserDeleteBranchResponse) {}
   rpc UserCreateTag(UserCreateTagRequest) returns (UserCreateTagResponse) {}
   rpc UserDeleteTag(UserDeleteTagRequest) returns (UserDeleteTagResponse) {}
+  rpc UserMergeToRef(UserMergeToRefRequest) returns (UserMergeToRefResponse) {}
   rpc UserMergeBranch(stream UserMergeBranchRequest) returns (stream UserMergeBranchResponse) {}
   rpc UserFFBranch(UserFFBranchRequest) returns (UserFFBranchResponse) {}
   rpc UserCherryPick(UserCherryPickRequest) returns (UserCherryPickResponse) {}
@@ -106,6 +107,27 @@ message UserMergeBranchResponse {
   string pre_receive_error = 4;
 }
 
+message UserMergeToRefRequest {
+  Repository repository = 1;
+  User user = 2;
+  string source_sha = 3;
+  bytes branch = 4;
+
+  // The merge of source_sha and branch has target_ref as target. 
+  //
+  // The target_ref is _always_ overwritten when merging source_sha
+  // and branch. That is, if a second request comes in, target_ref
+  // will lose its previous state and be updated to the latest merge
+  // between source_sha and branch.
+  bytes target_ref = 5;
+  bytes message = 6;
+}
+
+message UserMergeToRefResponse {
+  string commit_id = 1;
+  string pre_receive_error = 2;
+}
+
 message OperationBranchUpdate {
   // If this string is non-empty the branch has been updated.
   string commit_id = 1;
diff --git a/ruby/lib/gitaly/operations_pb.rb b/ruby/lib/gitaly/operations_pb.rb
index c1fb5612349600e161a6e6176ec3be78b75d43b4..a000e5de30e49e112815390a48b670cfc0cbdeb4 100644
--- a/ruby/lib/gitaly/operations_pb.rb
+++ b/ruby/lib/gitaly/operations_pb.rb
@@ -66,6 +66,18 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
     optional :branch_update, :message, 3, "gitaly.OperationBranchUpdate"
     optional :pre_receive_error, :string, 4
   end
+  add_message "gitaly.UserMergeToRefRequest" do
+    optional :repository, :message, 1, "gitaly.Repository"
+    optional :user, :message, 2, "gitaly.User"
+    optional :source_sha, :string, 3
+    optional :branch, :bytes, 4
+    optional :target_ref, :bytes, 5
+    optional :message, :bytes, 6
+  end
+  add_message "gitaly.UserMergeToRefResponse" do
+    optional :commit_id, :string, 1
+    optional :pre_receive_error, :string, 2
+  end
   add_message "gitaly.OperationBranchUpdate" do
     optional :commit_id, :string, 1
     optional :repo_created, :bool, 2
@@ -224,6 +236,8 @@ module Gitaly
   UserCreateTagResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.UserCreateTagResponse").msgclass
   UserMergeBranchRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.UserMergeBranchRequest").msgclass
   UserMergeBranchResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.UserMergeBranchResponse").msgclass
+  UserMergeToRefRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.UserMergeToRefRequest").msgclass
+  UserMergeToRefResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.UserMergeToRefResponse").msgclass
   OperationBranchUpdate = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.OperationBranchUpdate").msgclass
   UserFFBranchRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.UserFFBranchRequest").msgclass
   UserFFBranchResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.UserFFBranchResponse").msgclass
diff --git a/ruby/lib/gitaly/operations_services_pb.rb b/ruby/lib/gitaly/operations_services_pb.rb
index 8dd70dcc38c0a88f2d9e5a61d51194682b442410..188cdde6634ffe1cdc42a8eaa7d7e59e41b1992d 100644
--- a/ruby/lib/gitaly/operations_services_pb.rb
+++ b/ruby/lib/gitaly/operations_services_pb.rb
@@ -19,6 +19,7 @@ module Gitaly
       rpc :UserDeleteBranch, UserDeleteBranchRequest, UserDeleteBranchResponse
       rpc :UserCreateTag, UserCreateTagRequest, UserCreateTagResponse
       rpc :UserDeleteTag, UserDeleteTagRequest, UserDeleteTagResponse
+      rpc :UserMergeToRef, UserMergeToRefRequest, UserMergeToRefResponse
       rpc :UserMergeBranch, stream(UserMergeBranchRequest), stream(UserMergeBranchResponse)
       rpc :UserFFBranch, UserFFBranchRequest, UserFFBranchResponse
       rpc :UserCherryPick, UserCherryPickRequest, UserCherryPickResponse