implement `gateway.Reference.StatFile` method

Signed-off-by: Ian Campbell <ijc@docker.com>

cache/util/fsutil.go

@@ -122,3 +122,18 @@ func ReadDir(ctx context.Context, ref cache.ImmutableRef, req ReadDirRequest) ([
 	})
 	return rd, err
 }
+
+func StatFile(ctx context.Context, ref cache.ImmutableRef, path string) (*fstypes.Stat, error) {
+	var st *fstypes.Stat
+	err := withMount(ctx, ref, func(root string) error {
+		fp, err := fs.RootPath(root, path)
+		if err != nil {
+			return err
+		}
+		if st, err = fsutil.Stat(fp); err != nil {
+			return err
+		}
+		return nil
+	})
+	return st, err
+}

client/build.go

@@ -89,6 +89,11 @@ func (g *gatewayClientForBuild) ReadDir(ctx context.Context, in *gatewayapi.Read
 	return g.gateway.ReadDir(ctx, in, opts...)
 }
 
+func (g *gatewayClientForBuild) StatFile(ctx context.Context, in *gatewayapi.StatFileRequest, opts ...grpc.CallOption) (*gatewayapi.StatFileResponse, error) {
+	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
+	return g.gateway.StatFile(ctx, in, opts...)
+}
+
 func (g *gatewayClientForBuild) Ping(ctx context.Context, in *gatewayapi.PingRequest, opts ...grpc.CallOption) (*gatewayapi.PongResponse, error) {
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.Ping(ctx, in, opts...)

control/gateway/gateway.go

@@ -133,3 +133,11 @@ func (gwf *GatewayForwarder) ReadDir(ctx context.Context, req *gwapi.ReadDirRequ
 	}
 	return fwd.ReadDir(ctx, req)
 }
+
+func (gwf *GatewayForwarder) StatFile(ctx context.Context, req *gwapi.StatFileRequest) (*gwapi.StatFileResponse, error) {
+	fwd, err := gwf.lookupForwarder(ctx)
+	if err != nil {
+		return nil, errors.Wrap(err, "forwarding StatFile")
+	}
+	return fwd.StatFile(ctx, req)
+}

frontend/frontend_test.go

@@ -27,6 +27,7 @@ func TestFrontendIntegration(t *testing.T) {
 	integration.Run(t, []integration.Test{
 		testRefReadFile,
 		testRefReadDir,
+		testRefStatFile,
 	})
 }
 
@@ -213,6 +214,60 @@ func testRefReadDir(t *testing.T, sb integration.Sandbox) {
 	require.NoError(t, err)
 }
 
+func testRefStatFile(t *testing.T, sb integration.Sandbox) {
+	t.Parallel()
+	ctx := context.TODO()
+
+	c, err := client.New(ctx, sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	testcontent := []byte(`foobar`)
+
+	dir, err := tmpdir(
+		fstest.CreateFile("test", testcontent, 0666),
+	)
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	exp, err := fsutil.Stat(filepath.Join(dir, "test"))
+	require.NoError(t, err)
+
+	frontend := func(ctx context.Context, c gateway.Client) (*gateway.Result, error) {
+		def, err := llb.Local("mylocal").Marshal()
+		if err != nil {
+			return nil, err
+		}
+
+		res, err := c.Solve(ctx, gateway.SolveRequest{
+			Definition: def.ToPB(),
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		ref, err := res.SingleRef()
+		if err != nil {
+			return nil, err
+		}
+
+		st, err := ref.StatFile(ctx, gateway.StatRequest{
+			Path: "test",
+		})
+		require.NoError(t, err)
+		require.NotNil(t, st)
+		assert.Equal(t, exp, st)
+		return gateway.NewResult(), nil
+	}
+
+	_, err = c.Build(ctx, client.SolveOpt{
+		LocalDirs: map[string]string{
+			"mylocal": dir,
+		},
+	}, "", frontend, nil)
+	require.NoError(t, err)
+}
+
 func tmpdir(appliers ...fstest.Applier) (string, error) {
 	tmpdir, err := ioutil.TempDir("", "buildkit-frontend")
 	if err != nil {

frontend/gateway/client/client.go

@@ -18,7 +18,7 @@ type Client interface {
 
 type Reference interface {
 	ReadFile(ctx context.Context, req ReadRequest) ([]byte, error)
-	// StatFile(ctx context.Context, req StatRequest) (*StatResponse, error)
+	StatFile(ctx context.Context, req StatRequest) (*fstypes.Stat, error)
 	ReadDir(ctx context.Context, req ReadDirRequest) ([]*fstypes.Stat, error)
 }
 
@@ -37,6 +37,10 @@ type ReadDirRequest struct {
 	IncludePattern string
 }
 
+type StatRequest struct {
+	Path string
+}
+
 // SolveRequest is same as frontend.SolveRequest but avoiding dependency
 type SolveRequest struct {
 	Definition      *pb.Definition

frontend/gateway/forwarder/forward.go

@@ -162,6 +162,14 @@ func (r *ref) ReadDir(ctx context.Context, req client.ReadDirRequest) ([]*fstype
 	return cacheutil.ReadDir(ctx, ref, newReq)
 }
 
+func (r *ref) StatFile(ctx context.Context, req client.StatRequest) (*fstypes.Stat, error) {
+	ref, err := r.getImmutableRef()
+	if err != nil {
+		return nil, err
+	}
+	return cacheutil.StatFile(ctx, ref, req.Path)
+}
+
 func (r *ref) getImmutableRef() (cache.ImmutableRef, error) {
 	ref, ok := r.CachedResult.Sys().(*worker.WorkerRef)
 	if !ok {

frontend/gateway/gateway.go

@@ -533,6 +533,30 @@ func (lbf *llbBridgeForwarder) ReadDir(ctx context.Context, req *pb.ReadDirReque
 	return &pb.ReadDirResponse{Entries: entries}, nil
 }
 
+func (lbf *llbBridgeForwarder) StatFile(ctx context.Context, req *pb.StatFileRequest) (*pb.StatFileResponse, error) {
+	ctx = tracing.ContextWithSpanFromContext(ctx, lbf.callCtx)
+	lbf.mu.Lock()
+	ref, ok := lbf.refs[req.Ref]
+	lbf.mu.Unlock()
+	if !ok {
+		return nil, errors.Errorf("no such ref: %v", req.Ref)
+	}
+	if ref == nil {
+		return nil, errors.Wrapf(os.ErrNotExist, "%s not found", req.Path)
+	}
+	workerRef, ok := ref.Sys().(*worker.WorkerRef)
+	if !ok {
+		return nil, errors.Errorf("invalid ref: %T", ref.Sys())
+	}
+
+	st, err := cacheutil.StatFile(ctx, workerRef.ImmutableRef, req.Path)
+	if err != nil {
+		return nil, err
+	}
+
+	return &pb.StatFileResponse{Stat: st}, nil
+}
+
 func (lbf *llbBridgeForwarder) Ping(context.Context, *pb.PingRequest) (*pb.PongResponse, error) {
 
 	workers := lbf.workers.WorkerInfos()

frontend/gateway/grpcclient/client.go

@@ -368,6 +368,18 @@ func (r *reference) ReadDir(ctx context.Context, req client.ReadDirRequest) ([]*
 	return resp.Entries, nil
 }
 
+func (r *reference) StatFile(ctx context.Context, req client.StatRequest) (*fstypes.Stat, error) {
+	rdr := &pb.StatFileRequest{
+		Path: req.Path,
+		Ref:  r.id,
+	}
+	resp, err := r.c.client.StatFile(ctx, rdr)
+	if err != nil {
+		return nil, err
+	}
+	return resp.Stat, nil
+}
+
 func grpcClientConn(ctx context.Context) (context.Context, *grpc.ClientConn, error) {
 	dialOpt := grpc.WithDialer(func(addr string, d time.Duration) (net.Conn, error) {
 		return stdioConn(), nil

frontend/gateway/pb/caps.go

@@ -17,6 +17,7 @@ const (
 	CapReturnResult            apicaps.CapID = "return"
 	CapReturnMap               apicaps.CapID = "returnmap"
 	CapReadDir                 apicaps.CapID = "readdir"
+	CapStatFile                apicaps.CapID = "statfile"
 )
 
 func init() {
@@ -76,4 +77,11 @@ func init() {
 		Enabled: true,
 		Status:  apicaps.CapStatusExperimental,
 	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapStatFile,
+		Name:    "stat a file",
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
 }

frontend/gateway/pb/gateway.pb.go

@@ -21,6 +21,8 @@
 		ReadFileResponse
 		ReadDirRequest
 		ReadDirResponse
+		StatFileRequest
+		StatFileResponse
 		PingRequest
 		PongResponse
 */
@@ -499,13 +501,53 @@ func (m *ReadDirResponse) GetEntries() []*fsutil_types.Stat {
 	return nil
 }
 
+type StatFileRequest struct {
+	Ref  string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	Path string `protobuf:"bytes,2,opt,name=Path,proto3" json:"Path,omitempty"`
+}
+
+func (m *StatFileRequest) Reset()                    { *m = StatFileRequest{} }
+func (m *StatFileRequest) String() string            { return proto.CompactTextString(m) }
+func (*StatFileRequest) ProtoMessage()               {}
+func (*StatFileRequest) Descriptor() ([]byte, []int) { return fileDescriptorGateway, []int{13} }
+
+func (m *StatFileRequest) GetRef() string {
+	if m != nil {
+		return m.Ref
+	}
+	return ""
+}
+
+func (m *StatFileRequest) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+type StatFileResponse struct {
+	Stat *fsutil_types.Stat `protobuf:"bytes,1,opt,name=stat" json:"stat,omitempty"`
+}
+
+func (m *StatFileResponse) Reset()                    { *m = StatFileResponse{} }
+func (m *StatFileResponse) String() string            { return proto.CompactTextString(m) }
+func (*StatFileResponse) ProtoMessage()               {}
+func (*StatFileResponse) Descriptor() ([]byte, []int) { return fileDescriptorGateway, []int{14} }
+
+func (m *StatFileResponse) GetStat() *fsutil_types.Stat {
+	if m != nil {
+		return m.Stat
+	}
+	return nil
+}
+
 type PingRequest struct {
 }
 
 func (m *PingRequest) Reset()                    { *m = PingRequest{} }
 func (m *PingRequest) String() string            { return proto.CompactTextString(m) }
 func (*PingRequest) ProtoMessage()               {}
-func (*PingRequest) Descriptor() ([]byte, []int) { return fileDescriptorGateway, []int{13} }
+func (*PingRequest) Descriptor() ([]byte, []int) { return fileDescriptorGateway, []int{15} }
 
 type PongResponse struct {
 	FrontendAPICaps []moby_buildkit_v1_apicaps.APICap      `protobuf:"bytes,1,rep,name=FrontendAPICaps" json:"FrontendAPICaps"`
@@ -516,7 +558,7 @@ type PongResponse struct {
 func (m *PongResponse) Reset()                    { *m = PongResponse{} }
 func (m *PongResponse) String() string            { return proto.CompactTextString(m) }
 func (*PongResponse) ProtoMessage()               {}
-func (*PongResponse) Descriptor() ([]byte, []int) { return fileDescriptorGateway, []int{14} }
+func (*PongResponse) Descriptor() ([]byte, []int) { return fileDescriptorGateway, []int{16} }
 
 func (m *PongResponse) GetFrontendAPICaps() []moby_buildkit_v1_apicaps.APICap {
 	if m != nil {
@@ -553,6 +595,8 @@ func init() {
 	proto.RegisterType((*ReadFileResponse)(nil), "moby.buildkit.v1.frontend.ReadFileResponse")
 	proto.RegisterType((*ReadDirRequest)(nil), "moby.buildkit.v1.frontend.ReadDirRequest")
 	proto.RegisterType((*ReadDirResponse)(nil), "moby.buildkit.v1.frontend.ReadDirResponse")
+	proto.RegisterType((*StatFileRequest)(nil), "moby.buildkit.v1.frontend.StatFileRequest")
+	proto.RegisterType((*StatFileResponse)(nil), "moby.buildkit.v1.frontend.StatFileResponse")
 	proto.RegisterType((*PingRequest)(nil), "moby.buildkit.v1.frontend.PingRequest")
 	proto.RegisterType((*PongResponse)(nil), "moby.buildkit.v1.frontend.PongResponse")
 }
@@ -576,6 +620,8 @@ type LLBBridgeClient interface {
 	ReadFile(ctx context.Context, in *ReadFileRequest, opts ...grpc.CallOption) (*ReadFileResponse, error)
 	// apicaps:CapReadDir
 	ReadDir(ctx context.Context, in *ReadDirRequest, opts ...grpc.CallOption) (*ReadDirResponse, error)
+	// apicaps:CapStatFile
+	StatFile(ctx context.Context, in *StatFileRequest, opts ...grpc.CallOption) (*StatFileResponse, error)
 	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PongResponse, error)
 	Return(ctx context.Context, in *ReturnRequest, opts ...grpc.CallOption) (*ReturnResponse, error)
 }
@@ -624,6 +670,15 @@ func (c *lLBBridgeClient) ReadDir(ctx context.Context, in *ReadDirRequest, opts
 	return out, nil
 }
 
+func (c *lLBBridgeClient) StatFile(ctx context.Context, in *StatFileRequest, opts ...grpc.CallOption) (*StatFileResponse, error) {
+	out := new(StatFileResponse)
+	err := grpc.Invoke(ctx, "/moby.buildkit.v1.frontend.LLBBridge/StatFile", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *lLBBridgeClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PongResponse, error) {
 	out := new(PongResponse)
 	err := grpc.Invoke(ctx, "/moby.buildkit.v1.frontend.LLBBridge/Ping", in, out, c.cc, opts...)
@@ -653,6 +708,8 @@ type LLBBridgeServer interface {
 	ReadFile(context.Context, *ReadFileRequest) (*ReadFileResponse, error)
 	// apicaps:CapReadDir
 	ReadDir(context.Context, *ReadDirRequest) (*ReadDirResponse, error)
+	// apicaps:CapStatFile
+	StatFile(context.Context, *StatFileRequest) (*StatFileResponse, error)
 	Ping(context.Context, *PingRequest) (*PongResponse, error)
 	Return(context.Context, *ReturnRequest) (*ReturnResponse, error)
 }
@@ -733,6 +790,24 @@ func _LLBBridge_ReadDir_Handler(srv interface{}, ctx context.Context, dec func(i
 	return interceptor(ctx, in, info, handler)
 }
 
+func _LLBBridge_StatFile_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(StatFileRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(LLBBridgeServer).StatFile(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/moby.buildkit.v1.frontend.LLBBridge/StatFile",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(LLBBridgeServer).StatFile(ctx, req.(*StatFileRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _LLBBridge_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(PingRequest)
 	if err := dec(in); err != nil {
@@ -789,6 +864,10 @@ var _LLBBridge_serviceDesc = grpc.ServiceDesc{
 			MethodName: "ReadDir",
 			Handler:    _LLBBridge_ReadDir_Handler,
 		},
+		{
+			MethodName: "StatFile",
+			Handler:    _LLBBridge_StatFile_Handler,
+		},
 		{
 			MethodName: "Ping",
 			Handler:    _LLBBridge_Ping_Handler,
@@ -1323,6 +1402,64 @@ func (m *ReadDirResponse) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *StatFileRequest) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *StatFileRequest) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if len(m.Ref) > 0 {
+		dAtA[i] = 0xa
+		i++
+		i = encodeVarintGateway(dAtA, i, uint64(len(m.Ref)))
+		i += copy(dAtA[i:], m.Ref)
+	}
+	if len(m.Path) > 0 {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintGateway(dAtA, i, uint64(len(m.Path)))
+		i += copy(dAtA[i:], m.Path)
+	}
+	return i, nil
+}
+
+func (m *StatFileResponse) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *StatFileResponse) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.Stat != nil {
+		dAtA[i] = 0xa
+		i++
+		i = encodeVarintGateway(dAtA, i, uint64(m.Stat.Size()))
+		n9, err := m.Stat.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n9
+	}
+	return i, nil
+}
+
 func (m *PingRequest) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -1633,6 +1770,30 @@ func (m *ReadDirResponse) Size() (n int) {
 	return n
 }
 
+func (m *StatFileRequest) Size() (n int) {
+	var l int
+	_ = l
+	l = len(m.Ref)
+	if l > 0 {
+		n += 1 + l + sovGateway(uint64(l))
+	}
+	l = len(m.Path)
+	if l > 0 {
+		n += 1 + l + sovGateway(uint64(l))
+	}
+	return n
+}
+
+func (m *StatFileResponse) Size() (n int) {
+	var l int
+	_ = l
+	if m.Stat != nil {
+		l = m.Stat.Size()
+		n += 1 + l + sovGateway(uint64(l))
+	}
+	return n
+}
+
 func (m *PingRequest) Size() (n int) {
 	var l int
 	_ = l
@@ -3490,6 +3651,197 @@ func (m *ReadDirResponse) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *StatFileRequest) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGateway
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: StatFileRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: StatFileRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGateway
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGateway
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Ref = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Path", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGateway
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGateway
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Path = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGateway(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthGateway
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *StatFileResponse) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGateway
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: StatFileResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: StatFileResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Stat", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGateway
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGateway
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Stat == nil {
+				m.Stat = &fsutil_types.Stat{}
+			}
+			if err := m.Stat.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGateway(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthGateway
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *PingRequest) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
@@ -3791,74 +4143,77 @@ var (
 func init() { proto.RegisterFile("gateway.proto", fileDescriptorGateway) }
 
 var fileDescriptorGateway = []byte{
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+	0xf4, 0x0c, 0xca, 0x6f, 0xd5, 0x0f, 0x42, 0x6a, 0x26, 0xc7, 0x15, 0x25, 0xa7, 0x03, 0xd5, 0x6a,
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+	0xc0, 0x79, 0x78, 0x2b, 0x5d, 0xe3, 0xe4, 0x07, 0x28, 0x9b, 0xe2, 0x47, 0x0f, 0x6e, 0xc0, 0x4d,
+	0xdb, 0xd0, 0xd9, 0xb8, 0x8d, 0xea, 0x34, 0x8c, 0xac, 0xc8, 0xe7, 0x86, 0x31, 0xd3, 0x42, 0x73,
+	0xc3, 0xb8, 0xd4, 0x35, 0x6f, 0xa1, 0x28, 0xbb, 0x01, 0xad, 0xcf, 0x01, 0xe5, 0xda, 0xc5, 0x99,
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+	0x22, 0xe7, 0xc1, 0x2d, 0x34, 0xb5, 0xf9, 0x76, 0xfd, 0xfd, 0xf9, 0x9a, 0xf5, 0xd7, 0xf9, 0x9a,
+	0xf5, 0xcf, 0xf9, 0x9a, 0xd5, 0x5b, 0x52, 0xff, 0xb4, 0x8f, 0xff, 0x0b, 0x00, 0x00, 0xff, 0xff,
+	0x80, 0x7e, 0xd2, 0xb5, 0x25, 0x0c, 0x00, 0x00,
 }

frontend/gateway/pb/gateway.proto

@@ -22,6 +22,8 @@ service LLBBridge {
 	rpc ReadFile(ReadFileRequest) returns (ReadFileResponse);
 	// apicaps:CapReadDir
 	rpc ReadDir(ReadDirRequest) returns (ReadDirResponse);
+	// apicaps:CapStatFile
+	rpc StatFile(StatFileRequest) returns (StatFileResponse);
 	rpc Ping(PingRequest) returns (PongResponse);
 	rpc Return(ReturnRequest) returns (ReturnResponse);
 }
@@ -105,6 +107,15 @@ message ReadDirResponse {
 	repeated fsutil.types.Stat entries = 1;
 }
 
+message StatFileRequest {
+	string Ref = 1;
+	string Path = 2;
+}
+
+message StatFileResponse {
+	fsutil.types.Stat stat = 1;
+}
+
 message PingRequest{
 }
 message PongResponse{