diff --git a/api/services/control/control.pb.go b/api/services/control/control.pb.go
index a180b3ae5278..efed916c8f72 100644
--- a/api/services/control/control.pb.go
+++ b/api/services/control/control.pb.go
@@ -405,6 +405,7 @@ type SolveRequest struct {
 	Internal                bool                      `protobuf:"varint,11,opt,name=Internal,proto3" json:"Internal,omitempty"` // Internal builds are not recorded in build history
 	SourcePolicy            *pb1.Policy               `protobuf:"bytes,12,opt,name=SourcePolicy,proto3" json:"SourcePolicy,omitempty"`
 	Exporters               []*Exporter               `protobuf:"bytes,13,rep,name=Exporters,proto3" json:"Exporters,omitempty"`
+	EnableSessionExporter   bool                      `protobuf:"varint,14,opt,name=EnableSessionExporter,proto3" json:"EnableSessionExporter,omitempty"`
 }
 
 func (x *SolveRequest) Reset() {
@@ -528,6 +529,13 @@ func (x *SolveRequest) GetExporters() []*Exporter {
 	return nil
 }
 
+func (x *SolveRequest) GetEnableSessionExporter() bool {
+	if x != nil {
+		return x.EnableSessionExporter
+	}
+	return false
+}
+
 type CacheOptions struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2087,7 +2095,7 @@ var file_github_com_moby_buildkit_api_services_control_control_proto_rawDesc = [
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+	0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x53, 0x74, 0x61, 0x74, 0x75, 0x73, 0x52,
+	0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x30, 0x01, 0x12, 0x4d, 0x0a, 0x07, 0x53, 0x65, 0x73,
+	0x73, 0x69, 0x6f, 0x6e, 0x12, 0x1e, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e, 0x62, 0x75, 0x69, 0x6c,
+	0x64, 0x6b, 0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x42, 0x79, 0x74, 0x65, 0x73, 0x4d, 0x65, 0x73,
+	0x73, 0x61, 0x67, 0x65, 0x1a, 0x1e, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e, 0x62, 0x75, 0x69, 0x6c,
+	0x64, 0x6b, 0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x42, 0x79, 0x74, 0x65, 0x73, 0x4d, 0x65, 0x73,
+	0x73, 0x61, 0x67, 0x65, 0x28, 0x01, 0x30, 0x01, 0x12, 0x5a, 0x0a, 0x0b, 0x4c, 0x69, 0x73, 0x74,
+	0x57, 0x6f, 0x72, 0x6b, 0x65, 0x72, 0x73, 0x12, 0x24, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e, 0x62,
 	0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x4c, 0x69, 0x73, 0x74, 0x57,
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-	0x62, 0x79, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x42,
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-	0x73, 0x74, 0x1a, 0x23, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b,
-	0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x48, 0x69, 0x73, 0x74, 0x6f,
-	0x72, 0x79, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x30, 0x01, 0x12, 0x6f, 0x0a, 0x12, 0x55, 0x70, 0x64,
-	0x61, 0x74, 0x65, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x48, 0x69, 0x73, 0x74, 0x6f, 0x72, 0x79, 0x12,
-	0x2b, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2e,
-	0x76, 0x31, 0x2e, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x48, 0x69,
-	0x73, 0x74, 0x6f, 0x72, 0x79, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x2c, 0x2e, 0x6d,
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 	0x6f, 0x62, 0x79, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e,
-	0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x48, 0x69, 0x73, 0x74, 0x6f,
-	0x72, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x42, 0x40, 0x5a, 0x3e, 0x67, 0x69,
-	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6d, 0x6f, 0x62, 0x79, 0x2f, 0x62, 0x75,
-	0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2f, 0x61, 0x70, 0x69, 0x2f, 0x73, 0x65, 0x72, 0x76, 0x69,
-	0x63, 0x65, 0x73, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x3b, 0x6d, 0x6f, 0x62, 0x79,
-	0x5f, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x5f, 0x76, 0x31, 0x62, 0x06, 0x70, 0x72,
-	0x6f, 0x74, 0x6f, 0x33,
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+	0x6e, 0x66, 0x6f, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x62, 0x0a, 0x12, 0x4c,
+	0x69, 0x73, 0x74, 0x65, 0x6e, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x48, 0x69, 0x73, 0x74, 0x6f, 0x72,
+	0x79, 0x12, 0x25, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69,
+	0x74, 0x2e, 0x76, 0x31, 0x2e, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x48, 0x69, 0x73, 0x74, 0x6f, 0x72,
+	0x79, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x23, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e,
+	0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x42, 0x75, 0x69, 0x6c,
+	0x64, 0x48, 0x69, 0x73, 0x74, 0x6f, 0x72, 0x79, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x30, 0x01, 0x12,
+	0x6f, 0x0a, 0x12, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x48, 0x69,
+	0x73, 0x74, 0x6f, 0x72, 0x79, 0x12, 0x2b, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e, 0x62, 0x75, 0x69,
+	0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x42,
+	0x75, 0x69, 0x6c, 0x64, 0x48, 0x69, 0x73, 0x74, 0x6f, 0x72, 0x79, 0x52, 0x65, 0x71, 0x75, 0x65,
+	0x73, 0x74, 0x1a, 0x2c, 0x2e, 0x6d, 0x6f, 0x62, 0x79, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b,
+	0x69, 0x74, 0x2e, 0x76, 0x31, 0x2e, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x42, 0x75, 0x69, 0x6c,
+	0x64, 0x48, 0x69, 0x73, 0x74, 0x6f, 0x72, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x42, 0x40, 0x5a, 0x3e, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6d,
+	0x6f, 0x62, 0x79, 0x2f, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2f, 0x61, 0x70, 0x69,
+	0x2f, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x73, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f,
+	0x6c, 0x3b, 0x6d, 0x6f, 0x62, 0x79, 0x5f, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x5f,
+	0x76, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/api/services/control/control.proto b/api/services/control/control.proto
index 85da9a72a73d..24816d05cd8d 100644
--- a/api/services/control/control.proto
+++ b/api/services/control/control.proto
@@ -74,6 +74,7 @@ message SolveRequest {
 	bool Internal = 11; // Internal builds are not recorded in build history
 	moby.buildkit.v1.sourcepolicy.Policy SourcePolicy = 12;
 	repeated Exporter Exporters = 13;
+	bool EnableSessionExporter = 14;
 }
 
 message CacheOptions {
diff --git a/api/services/control/control_vtproto.pb.go b/api/services/control/control_vtproto.pb.go
index e4daa74ca57b..e220f1bd5557 100644
--- a/api/services/control/control_vtproto.pb.go
+++ b/api/services/control/control_vtproto.pb.go
@@ -140,6 +140,7 @@ func (m *SolveRequest) CloneVT() *SolveRequest {
 	r.Cache = m.Cache.CloneVT()
 	r.Internal = m.Internal
 	r.SourcePolicy = m.SourcePolicy.CloneVT()
+	r.EnableSessionExporter = m.EnableSessionExporter
 	if rhs := m.ExporterAttrsDeprecated; rhs != nil {
 		tmpContainer := make(map[string]string, len(rhs))
 		for k, v := range rhs {
@@ -1031,6 +1032,9 @@ func (this *SolveRequest) EqualVT(that *SolveRequest) bool {
 			}
 		}
 	}
+	if this.EnableSessionExporter != that.EnableSessionExporter {
+		return false
+	}
 	return string(this.unknownFields) == string(that.unknownFields)
 }
 
@@ -2232,6 +2236,16 @@ func (m *SolveRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.EnableSessionExporter {
+		i--
+		if m.EnableSessionExporter {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x70
+	}
 	if len(m.Exporters) > 0 {
 		for iNdEx := len(m.Exporters) - 1; iNdEx >= 0; iNdEx-- {
 			size, err := m.Exporters[iNdEx].MarshalToSizedBufferVT(dAtA[:i])
@@ -4130,6 +4144,9 @@ func (m *SolveRequest) SizeVT() (n int) {
 			n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 		}
 	}
+	if m.EnableSessionExporter {
+		n += 2
+	}
 	n += len(m.unknownFields)
 	return n
 }
@@ -6211,6 +6228,26 @@ func (m *SolveRequest) UnmarshalVT(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 14:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field EnableSessionExporter", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.EnableSessionExporter = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
diff --git a/client/build.go b/client/build.go
index c27c1a60c0ea..93787ba4ff55 100644
--- a/client/build.go
+++ b/client/build.go
@@ -53,7 +53,8 @@ func (c *Client) Build(ctx context.Context, opt SolveOpt, product string, buildF
 			return err
 		}
 
-		gwClient.caps = g.BuildOpts().Caps
+		caps := g.BuildOpts().Caps
+		gwClient.caps = &caps
 
 		if err := g.Run(ctx, buildFunc); err != nil {
 			return errors.Wrap(err, "failed to run Build function")
@@ -72,10 +73,14 @@ func (c *Client) gatewayClientForBuild(buildid string) *gatewayClientForBuild {
 	}
 }
 
+func (c *Client) GatewayClientForBuild(buildid string) gatewayapi.LLBBridgeClient {
+	return c.gatewayClientForBuild(buildid)
+}
+
 type gatewayClientForBuild struct {
 	gateway gatewayapi.LLBBridgeClient
 	buildID string
-	caps    apicaps.CapSet
+	caps    *apicaps.CapSet
 }
 
 func (g *gatewayClientForBuild) ResolveImageConfig(ctx context.Context, in *gatewayapi.ResolveImageConfigRequest, opts ...grpc.CallOption) (*gatewayapi.ResolveImageConfigResponse, error) {
@@ -99,29 +104,35 @@ func (g *gatewayClientForBuild) ReadFile(ctx context.Context, in *gatewayapi.Rea
 }
 
 func (g *gatewayClientForBuild) ReadDir(ctx context.Context, in *gatewayapi.ReadDirRequest, opts ...grpc.CallOption) (*gatewayapi.ReadDirResponse, error) {
-	if err := g.caps.Supports(gatewayapi.CapReadDir); err != nil {
-		return nil, err
+	if g.caps != nil {
+		if err := g.caps.Supports(gatewayapi.CapReadDir); err != nil {
+			return nil, err
+		}
 	}
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.ReadDir(ctx, in, opts...)
 }
 
 func (g *gatewayClientForBuild) StatFile(ctx context.Context, in *gatewayapi.StatFileRequest, opts ...grpc.CallOption) (*gatewayapi.StatFileResponse, error) {
-	if err := g.caps.Supports(gatewayapi.CapStatFile); err != nil {
-		return nil, err
+	if g.caps != nil {
+		if err := g.caps.Supports(gatewayapi.CapStatFile); err != nil {
+			return nil, err
+		}
 	}
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.StatFile(ctx, in, opts...)
 }
 
 func (g *gatewayClientForBuild) Evaluate(ctx context.Context, in *gatewayapi.EvaluateRequest, opts ...grpc.CallOption) (*gatewayapi.EvaluateResponse, error) {
-	if err := g.caps.Supports(gatewayapi.CapGatewayEvaluate); err != nil {
-		if err2 := g.caps.Supports(gatewayapi.CapStatFile); err2 != nil {
-			return nil, err
+	if g.caps != nil {
+		if err := g.caps.Supports(gatewayapi.CapGatewayEvaluate); err != nil {
+			if err2 := g.caps.Supports(gatewayapi.CapStatFile); err2 != nil {
+				return nil, err
+			}
+			ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
+			_, err := g.gateway.StatFile(ctx, &gatewayapi.StatFileRequest{Ref: in.Ref, Path: "."}, opts...)
+			return &gatewayapi.EvaluateResponse{}, err
 		}
-		ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
-		_, err := g.gateway.StatFile(ctx, &gatewayapi.StatFileRequest{Ref: in.Ref, Path: "."}, opts...)
-		return &gatewayapi.EvaluateResponse{}, err
 	}
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.Evaluate(ctx, in, opts...)
@@ -138,32 +149,40 @@ func (g *gatewayClientForBuild) Return(ctx context.Context, in *gatewayapi.Retur
 }
 
 func (g *gatewayClientForBuild) Inputs(ctx context.Context, in *gatewayapi.InputsRequest, opts ...grpc.CallOption) (*gatewayapi.InputsResponse, error) {
-	if err := g.caps.Supports(gatewayapi.CapFrontendInputs); err != nil {
-		return nil, err
+	if g.caps != nil {
+		if err := g.caps.Supports(gatewayapi.CapFrontendInputs); err != nil {
+			return nil, err
+		}
 	}
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.Inputs(ctx, in, opts...)
 }
 
 func (g *gatewayClientForBuild) NewContainer(ctx context.Context, in *gatewayapi.NewContainerRequest, opts ...grpc.CallOption) (*gatewayapi.NewContainerResponse, error) {
-	if err := g.caps.Supports(gatewayapi.CapGatewayExec); err != nil {
-		return nil, err
+	if g.caps != nil {
+		if err := g.caps.Supports(gatewayapi.CapGatewayExec); err != nil {
+			return nil, err
+		}
 	}
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.NewContainer(ctx, in, opts...)
 }
 
 func (g *gatewayClientForBuild) ReleaseContainer(ctx context.Context, in *gatewayapi.ReleaseContainerRequest, opts ...grpc.CallOption) (*gatewayapi.ReleaseContainerResponse, error) {
-	if err := g.caps.Supports(gatewayapi.CapGatewayExec); err != nil {
-		return nil, err
+	if g.caps != nil {
+		if err := g.caps.Supports(gatewayapi.CapGatewayExec); err != nil {
+			return nil, err
+		}
 	}
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.ReleaseContainer(ctx, in, opts...)
 }
 
 func (g *gatewayClientForBuild) ExecProcess(ctx context.Context, opts ...grpc.CallOption) (gatewayapi.LLBBridge_ExecProcessClient, error) {
-	if err := g.caps.Supports(gatewayapi.CapGatewayExec); err != nil {
-		return nil, err
+	if g.caps != nil {
+		if err := g.caps.Supports(gatewayapi.CapGatewayExec); err != nil {
+			return nil, err
+		}
 	}
 	ctx = buildid.AppendToOutgoingContext(ctx, g.buildID)
 	return g.gateway.ExecProcess(ctx, opts...)
diff --git a/client/client_test.go b/client/client_test.go
index ad2c7c5e8c40..14b167a614f4 100644
--- a/client/client_test.go
+++ b/client/client_test.go
@@ -9,6 +9,7 @@ import (
 	"crypto/rsa"
 	"crypto/x509"
 	"encoding/base64"
+	"encoding/binary"
 	"encoding/json"
 	"encoding/pem"
 	"fmt"
@@ -19,6 +20,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"runtime"
 	"strconv"
 	"strings"
 	"syscall"
@@ -46,6 +48,8 @@ import (
 	gatewaypb "github.com/moby/buildkit/frontend/gateway/pb"
 	"github.com/moby/buildkit/identity"
 	"github.com/moby/buildkit/session"
+	"github.com/moby/buildkit/session/exporter"
+	"github.com/moby/buildkit/session/exporter/exporterprovider"
 	"github.com/moby/buildkit/session/filesync"
 	"github.com/moby/buildkit/session/secrets/secretsprovider"
 	"github.com/moby/buildkit/session/sshforward/sshprovider"
@@ -70,6 +74,7 @@ import (
 	"github.com/spdx/tools-golang/spdx"
 	"github.com/stretchr/testify/require"
 	"github.com/tonistiigi/fsutil"
+	fsutiltypes "github.com/tonistiigi/fsutil/types"
 	"golang.org/x/crypto/ssh/agent"
 	"golang.org/x/mod/semver"
 	"golang.org/x/sync/errgroup"
@@ -114,6 +119,7 @@ var allTests = []func(t *testing.T, sb integration.Sandbox){
 	testUser,
 	testOCIExporter,
 	testOCIExporterContentStore,
+	testSessionExporter,
 	testWhiteoutParentDir,
 	testFrontendImageNaming,
 	testDuplicateWhiteouts,
@@ -225,6 +231,7 @@ var allTests = []func(t *testing.T, sb integration.Sandbox){
 	testFrontendLintSkipVerifyPlatforms,
 	testRunValidExitCodes,
 	testFileOpSymlink,
+	testMetadataOnlyLocal,
 }
 
 func TestIntegration(t *testing.T) {
@@ -2310,6 +2317,108 @@ func testOCILayoutSource(t *testing.T, sb integration.Sandbox) {
 	require.Equal(t, []byte("second"+newLine), dt)
 }
 
+func testSessionExporter(t *testing.T, sb integration.Sandbox) {
+	integration.SkipOnPlatform(t, "windows")
+	workers.CheckFeatureCompat(t, sb, workers.FeatureOCIExporter, workers.FeatureOCILayout)
+	c, err := New(context.TODO(), sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	// make an image that is exported there
+	imgName := integration.UnixOrWindows("busybox:latest", "nanoserver:latest")
+	busybox := llb.Image(imgName)
+	st := integration.UnixOrWindows(
+		llb.Scratch(),
+		llb.Image(imgName),
+	)
+
+	run := func(cmd string) {
+		st = busybox.Run(llb.Shlex(cmd), llb.Dir("/wd")).AddMount("/wd", st)
+	}
+
+	cmdPrefix := `sh -c "echo -n`
+	run(fmt.Sprintf(`%s first > foo"`, cmdPrefix))
+	run(fmt.Sprintf(`%s second > bar"`, cmdPrefix))
+
+	def, err := st.Marshal(sb.Context())
+	require.NoError(t, err)
+
+	var attachable []session.Attachable
+	target := filesync.NewFSSyncTarget()
+
+	attachable = append(attachable, target)
+
+	buildID := identity.NewID()
+
+	outW := bytes.NewBuffer(nil)
+	exporterCalled := false
+	exporter := exporterprovider.New(func(ctx context.Context, md map[string][]byte, refs []string) ([]*exporter.ExporterRequest, error) {
+		require.Len(t, refs, 1)
+		g := c.GatewayClientForBuild(buildID)
+		resp, err := g.ReadDir(sb.Context(), &gatewaypb.ReadDirRequest{
+			Ref:     refs[0],
+			DirPath: "/",
+		})
+		if err != nil {
+			return nil, err
+		}
+		t.Logf("readdir: %v", resp)
+
+		require.Equal(t, 2, len(resp.Entries))
+		require.Equal(t, "bar", resp.Entries[0].Path)
+		require.Equal(t, "foo", resp.Entries[1].Path)
+
+		exporterCalled = true
+		target.Add(filesync.WithFSSync(0, fixedWriteCloser(nopWriteCloser{outW})))
+		return []*exporter.ExporterRequest{
+			{
+				Type: ExporterOCI,
+				Attrs: map[string]string{
+					"compression": "zstd",
+				},
+			},
+		}, nil
+	})
+	require.NoError(t, err)
+	attachable = append(attachable, exporter)
+
+	_, err = c.Build(sb.Context(), SolveOpt{
+		EnableSessionExporter: true,
+		Session:               attachable,
+		Ref:                   buildID,
+	}, "", func(ctx context.Context, c gateway.Client) (*gateway.Result, error) {
+		return c.Solve(ctx, gateway.SolveRequest{
+			Definition: def.ToPB(),
+		})
+	}, nil)
+	require.NoError(t, err)
+
+	require.True(t, exporterCalled)
+
+	// extract the tar stream to the directory as OCI layout
+	m, err := testutil.ReadTarToMap(outW.Bytes(), false)
+	require.NoError(t, err)
+
+	var index ocispecs.Index
+	err = json.Unmarshal(m[ocispecs.ImageIndexFile].Data, &index)
+	require.NoError(t, err)
+	require.Equal(t, 1, len(index.Manifests))
+	digest := index.Manifests[0].Digest
+
+	var mfst ocispecs.Manifest
+	err = json.Unmarshal(m[path.Join("blobs/sha256", digest.Hex())].Data, &mfst)
+	require.NoError(t, err)
+
+	if runtime.GOOS == "windows" {
+		mfst.Layers = mfst.Layers[1:] // skip base layer
+	}
+
+	require.Equal(t, 2, len(mfst.Layers))
+	for _, layer := range mfst.Layers {
+		require.Contains(t, layer.MediaType, "application/vnd.oci.image.layer.v1.tar+zstd")
+	}
+}
+
 func testOCILayoutPlatformSource(t *testing.T, sb integration.Sandbox) {
 	workers.CheckFeatureCompat(t, sb, workers.FeatureOCIExporter, workers.FeatureOCILayout)
 	requiresLinux(t)
@@ -8453,6 +8562,150 @@ func testParallelLocalBuilds(t *testing.T, sb integration.Sandbox) {
 	require.NoError(t, err)
 }
 
+func testMetadataOnlyLocal(t *testing.T, sb integration.Sandbox) {
+	ctx, cancel := context.WithCancelCause(sb.Context())
+	defer func() { cancel(errors.WithStack(context.Canceled)) }()
+
+	c, err := New(ctx, sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	srcDir := integration.Tmpdir(
+		t,
+		fstest.CreateFile("data", []byte("contents"), 0600),
+		fstest.CreateDir("dir", 0700),
+		fstest.CreateFile("dir/file1", []byte("file1"), 0600),
+		fstest.CreateFile("dir/file2", []byte("file2"), 0600),
+		fstest.CreateDir("dir/subdir", 0700),
+		fstest.CreateDir("dir/subdir2", 0700),
+		fstest.CreateFile("dir/subdir/bar1", []byte("bar1"), 0600),
+		fstest.CreateFile("dir/subdir/bar2", []byte("bar2"), 0600),
+		fstest.CreateFile("dir/subdir2/bar3", []byte("bar3"), 0600),
+		fstest.CreateFile("foo", []byte("foo"), 0602),
+	)
+
+	def, err := llb.Local("source", llb.MetadataOnlyTransfer([]string{"dir/**/*1", "foo"})).Marshal(sb.Context())
+	require.NoError(t, err)
+
+	destDir := t.TempDir()
+
+	_, err = c.Solve(ctx, def, SolveOpt{
+		Exports: []ExportEntry{
+			{
+				Type:      ExporterLocal,
+				OutputDir: destDir,
+			},
+		},
+		LocalMounts: map[string]fsutil.FS{
+			"source": srcDir,
+		},
+	}, nil)
+	require.NoError(t, err)
+
+	_, err = os.ReadFile(filepath.Join(destDir, "data"))
+	require.Error(t, err)
+	require.True(t, os.IsNotExist(err))
+
+	act, err := os.ReadFile(filepath.Join(destDir, "dir/file1"))
+	require.NoError(t, err)
+	require.Equal(t, "file1", string(act))
+
+	act, err = os.ReadFile(filepath.Join(destDir, "foo"))
+	require.NoError(t, err)
+	require.Equal(t, "foo", string(act))
+
+	_, err = os.ReadFile(filepath.Join(destDir, "dir/file2"))
+	require.Error(t, err)
+	require.True(t, os.IsNotExist(err))
+
+	act, err = os.ReadFile(filepath.Join(destDir, "dir/subdir/bar1"))
+	require.NoError(t, err)
+	require.Equal(t, "bar1", string(act))
+
+	_, err = os.Stat(filepath.Join(destDir, "dir/subdir2"))
+	require.Error(t, err)
+	require.True(t, os.IsNotExist(err))
+
+	_, err = os.ReadFile(filepath.Join(destDir, "dir/subdir/bar2"))
+	require.Error(t, err)
+	require.True(t, os.IsNotExist(err))
+
+	dt, err := os.ReadFile(filepath.Join(destDir, ".fsutil-metadata"))
+	require.NoError(t, err)
+
+	stats := parseFSMetadata(t, dt)
+	require.Equal(t, 10, len(stats))
+
+	require.Equal(t, "data", stats[0].Path)
+	require.Equal(t, "dir", stats[1].Path)
+	require.Equal(t, "dir/file1", stats[2].Path)
+	require.Equal(t, "dir/file2", stats[3].Path)
+	require.Equal(t, "dir/subdir", stats[4].Path)
+	require.Equal(t, "dir/subdir/bar1", stats[5].Path)
+	require.Equal(t, "dir/subdir/bar2", stats[6].Path)
+	require.Equal(t, "dir/subdir2", stats[7].Path)
+	require.Equal(t, "dir/subdir2/bar3", stats[8].Path)
+	require.Equal(t, "foo", stats[9].Path)
+
+	err = os.RemoveAll(filepath.Join(srcDir.Name, "dir/subdir"))
+	require.NoError(t, err)
+
+	err = os.WriteFile(filepath.Join(srcDir.Name, "dir/file1"), []byte("file1-updated"), 0600)
+	require.NoError(t, err)
+
+	err = os.WriteFile(filepath.Join(srcDir.Name, "dir/bar1"), []byte("bar1"), 0600)
+	require.NoError(t, err)
+
+	def, err = llb.Local("source", llb.MetadataOnlyTransfer([]string{"dir/**/*1", "foo"})).Marshal(sb.Context())
+	require.NoError(t, err)
+
+	destDir = t.TempDir()
+
+	_, err = c.Solve(ctx, def, SolveOpt{
+		Exports: []ExportEntry{
+			{
+				Type:      ExporterLocal,
+				OutputDir: destDir,
+			},
+		},
+		LocalMounts: map[string]fsutil.FS{
+			"source": srcDir,
+		},
+	}, nil)
+	require.NoError(t, err)
+
+	_, err = os.ReadFile(filepath.Join(destDir, "data"))
+	require.Error(t, err)
+	require.True(t, os.IsNotExist(err))
+
+	act, err = os.ReadFile(filepath.Join(destDir, "dir/file1"))
+	require.NoError(t, err)
+	require.Equal(t, "file1-updated", string(act))
+
+	act, err = os.ReadFile(filepath.Join(destDir, "dir/bar1"))
+	require.NoError(t, err)
+	require.Equal(t, "bar1", string(act))
+
+	_, err = os.Stat(filepath.Join(destDir, "dir/subdir"))
+	require.Error(t, err)
+	require.True(t, os.IsNotExist(err))
+
+	dt, err = os.ReadFile(filepath.Join(destDir, ".fsutil-metadata"))
+	require.NoError(t, err)
+
+	stats = parseFSMetadata(t, dt)
+	require.Equal(t, 8, len(stats))
+
+	require.Equal(t, "data", stats[0].Path)
+	require.Equal(t, "dir", stats[1].Path)
+	require.Equal(t, "dir/bar1", stats[2].Path)
+	require.Equal(t, "dir/file1", stats[3].Path)
+	require.Equal(t, "dir/file2", stats[4].Path)
+	require.Equal(t, "dir/subdir2", stats[5].Path)
+	require.Equal(t, "dir/subdir2/bar3", stats[6].Path)
+	require.Equal(t, "foo", stats[7].Path)
+}
+
 // testRelativeMountpoint is a test that relative paths for mountpoints don't
 // fail when runc is upgraded to at least rc95, which introduces an error when
 // mountpoints are not absolute. Relative paths should be transformed to
@@ -11663,3 +11916,17 @@ devices:
 	require.NotContains(t, strings.TrimSpace(string(dt)), `BAZ=injected`)
 	require.NotContains(t, strings.TrimSpace(string(dt)), `QUX=injected`)
 }
+
+func parseFSMetadata(t *testing.T, dt []byte) []fsutiltypes.Stat {
+	var m []fsutiltypes.Stat
+	for len(dt) > 0 {
+		var s fsutiltypes.Stat
+		n := binary.LittleEndian.Uint32(dt[:4])
+		dt = dt[4:]
+		err := s.Unmarshal(dt[:n])
+		require.NoError(t, err)
+		m = append(m, *s.CloneVT())
+		dt = dt[n:]
+	}
+	return m
+}
diff --git a/client/llb/source.go b/client/llb/source.go
index e4290b4638dc..443a0cc6bcaf 100644
--- a/client/llb/source.go
+++ b/client/llb/source.go
@@ -435,6 +435,13 @@ func Local(name string, opts ...LocalOption) State {
 			addCap(&gi.Constraints, pb.CapSourceLocalDiffer)
 		}
 	}
+	if gi.MetadataOnlyCollector {
+		attrs[pb.AttrMetadataTransfer] = "true"
+		if gi.MetadataOnlyExceptions != "" {
+			attrs[pb.AttrMetadataTransferExclude] = gi.MetadataOnlyExceptions
+		}
+		addCap(&gi.Constraints, pb.CapSourceMetadataTransfer)
+	}
 
 	addCap(&gi.Constraints, pb.CapSourceLocal)
 
@@ -506,6 +513,18 @@ func Differ(t DiffType, required bool) LocalOption {
 	})
 }
 
+func MetadataOnlyTransfer(exceptions []string) LocalOption {
+	return localOptionFunc(func(li *LocalInfo) {
+		li.MetadataOnlyCollector = true
+		if len(exceptions) == 0 {
+			li.MetadataOnlyExceptions = ""
+		} else {
+			dt, _ := json.Marshal(exceptions) // empty on error
+			li.MetadataOnlyExceptions = string(dt)
+		}
+	})
+}
+
 func OCILayout(ref string, opts ...OCILayoutOption) State {
 	gi := &OCILayoutInfo{}
 
@@ -578,12 +597,14 @@ type DifferInfo struct {
 
 type LocalInfo struct {
 	constraintsWrapper
-	SessionID       string
-	IncludePatterns string
-	ExcludePatterns string
-	FollowPaths     string
-	SharedKeyHint   string
-	Differ          DifferInfo
+	SessionID              string
+	IncludePatterns        string
+	ExcludePatterns        string
+	FollowPaths            string
+	SharedKeyHint          string
+	Differ                 DifferInfo
+	MetadataOnlyCollector  bool
+	MetadataOnlyExceptions string
 }
 
 func HTTP(url string, opts ...HTTPOption) State {
diff --git a/client/solve.go b/client/solve.go
index 557c4886fff1..f3e97b3aa8e7 100644
--- a/client/solve.go
+++ b/client/solve.go
@@ -35,6 +35,7 @@ import (
 
 type SolveOpt struct {
 	Exports               []ExportEntry
+	EnableSessionExporter bool
 	LocalDirs             map[string]string // Deprecated: use LocalMounts
 	LocalMounts           map[string]fsutil.FS
 	OCIStores             map[string]content.Store
@@ -270,6 +271,7 @@ func (c *Client) solve(ctx context.Context, def *llb.Definition, runGateway runG
 			Exporters:               exports,
 			ExporterDeprecated:      exportDeprecated,
 			ExporterAttrsDeprecated: exportAttrDeprecated,
+			EnableSessionExporter:   opt.EnableSessionExporter,
 			Session:                 s.ID(),
 			Frontend:                opt.Frontend,
 			FrontendAttrs:           frontendAttrs,
diff --git a/control/control.go b/control/control.go
index dd03c75673a8..a86f7dc5aebf 100644
--- a/control/control.go
+++ b/control/control.go
@@ -514,8 +514,9 @@ func (c *Controller) Solve(ctx context.Context, req *controlapi.SolveRequest) (*
 		FrontendInputs: req.FrontendInputs,
 		CacheImports:   cacheImports,
 	}, llbsolver.ExporterRequest{
-		Exporters:      expis,
-		CacheExporters: cacheExporters,
+		Exporters:             expis,
+		CacheExporters:        cacheExporters,
+		EnableSessionExporter: req.EnableSessionExporter,
 	}, entitlementsFromPB(req.Entitlements), procs, req.Internal, req.SourcePolicy)
 	if err != nil {
 		return nil, err
diff --git a/frontend/gateway/gateway.go b/frontend/gateway/gateway.go
index 158e4ccfd89a..45d6b45acf5c 100644
--- a/frontend/gateway/gateway.go
+++ b/frontend/gateway/gateway.go
@@ -891,10 +891,18 @@ func (lbf *llbBridgeForwarder) Solve(ctx context.Context, req *pb.SolveRequest)
 func (lbf *llbBridgeForwarder) getImmutableRef(ctx context.Context, id string) (cache.ImmutableRef, error) {
 	lbf.mu.Lock()
 	ref, ok := lbf.refs[id]
-	lbf.mu.Unlock()
 	if !ok {
-		return nil, errors.Errorf("no such ref: %s", id)
+		if lbf.result != nil {
+			if r, ok := lbf.result.FindRef(id); ok {
+				ref = r
+			}
+		}
+		if ref == nil {
+			lbf.mu.Unlock()
+			return nil, errors.Errorf("no such ref: %s, all %+v", id, maps.Keys(lbf.refs))
+		}
 	}
+	lbf.mu.Unlock()
 	if ref == nil {
 		return nil, errors.Errorf("empty ref: %s", id)
 	}
diff --git a/go.mod b/go.mod
index 36cf697a8c54..d905f7fc02fd 100644
--- a/go.mod
+++ b/go.mod
@@ -73,7 +73,7 @@ require (
 	github.com/spdx/tools-golang v0.5.3
 	github.com/stretchr/testify v1.10.0
 	github.com/tonistiigi/dchapes-mode v0.0.0-20250318174251-73d941a28323
-	github.com/tonistiigi/fsutil v0.0.0-20250318190121-d73a4b3b8a7e
+	github.com/tonistiigi/fsutil v0.0.0-20250410151801-5b74a7ad7583
 	github.com/tonistiigi/go-actions-cache v0.0.0-20250228231703-3e9a6642607f
 	github.com/tonistiigi/go-archvariant v1.0.0
 	github.com/tonistiigi/go-csvvalue v0.0.0-20240710180619-ddb21b71c0b4
diff --git a/go.sum b/go.sum
index 1dd8dd1222c3..6c4c65dffb07 100644
--- a/go.sum
+++ b/go.sum
@@ -397,8 +397,8 @@ github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 h1:kdXcSzyDtse
 github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635/go.mod h1:hkRG7XYTFWNJGYcbNJQlaLq0fg1yr4J4t/NcTQtrfww=
 github.com/tonistiigi/dchapes-mode v0.0.0-20250318174251-73d941a28323 h1:r0p7fK56l8WPequOaR3i9LBqfPtEdXIQbUTzT55iqT4=
 github.com/tonistiigi/dchapes-mode v0.0.0-20250318174251-73d941a28323/go.mod h1:3Iuxbr0P7D3zUzBMAZB+ois3h/et0shEz0qApgHYGpY=
-github.com/tonistiigi/fsutil v0.0.0-20250318190121-d73a4b3b8a7e h1:AiXT0JHwQA52AEOVMsxRytSI9mdJSie5gUp6OQ1R8fU=
-github.com/tonistiigi/fsutil v0.0.0-20250318190121-d73a4b3b8a7e/go.mod h1:BKdcez7BiVtBvIcef90ZPc6ebqIWr4JWD7+EvLm6J98=
+github.com/tonistiigi/fsutil v0.0.0-20250410151801-5b74a7ad7583 h1:mK+ZskNt7SG4dxfKIi27C7qHAQzyjAVt1iyTf0hmsNc=
+github.com/tonistiigi/fsutil v0.0.0-20250410151801-5b74a7ad7583/go.mod h1:BKdcez7BiVtBvIcef90ZPc6ebqIWr4JWD7+EvLm6J98=
 github.com/tonistiigi/go-actions-cache v0.0.0-20250228231703-3e9a6642607f h1:q/SWz3Bz0KtAsqaBo73CHVXjaz5O8PDnmD2JHVhgYnE=
 github.com/tonistiigi/go-actions-cache v0.0.0-20250228231703-3e9a6642607f/go.mod h1:h0oRlVs3NoFIHysRQ4rU1+RG4QmU0M2JVSwTYrB4igk=
 github.com/tonistiigi/go-archvariant v1.0.0 h1:5LC1eDWiBNflnTF1prCiX09yfNHIxDC/aukdhCdTyb0=
diff --git a/session/exporter/exporter.pb.go b/session/exporter/exporter.pb.go
new file mode 100644
index 000000000000..fd52ca6c4368
--- /dev/null
+++ b/session/exporter/exporter.pb.go
@@ -0,0 +1,278 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.35.2
+// 	protoc        v3.11.4
+// source: github.com/moby/buildkit/session/exporter/exporter.proto
+
+package exporter
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type FindExportersRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Metadata map[string][]byte `protobuf:"bytes,1,rep,name=metadata,proto3" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Refs     []string          `protobuf:"bytes,2,rep,name=refs,proto3" json:"refs,omitempty"`
+}
+
+func (x *FindExportersRequest) Reset() {
+	*x = FindExportersRequest{}
+	mi := &file_github_com_moby_buildkit_session_exporter_exporter_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *FindExportersRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FindExportersRequest) ProtoMessage() {}
+
+func (x *FindExportersRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_github_com_moby_buildkit_session_exporter_exporter_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FindExportersRequest.ProtoReflect.Descriptor instead.
+func (*FindExportersRequest) Descriptor() ([]byte, []int) {
+	return file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *FindExportersRequest) GetMetadata() map[string][]byte {
+	if x != nil {
+		return x.Metadata
+	}
+	return nil
+}
+
+func (x *FindExportersRequest) GetRefs() []string {
+	if x != nil {
+		return x.Refs
+	}
+	return nil
+}
+
+type FindExportersResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Exporters []*ExporterRequest `protobuf:"bytes,1,rep,name=exporters,proto3" json:"exporters,omitempty"`
+}
+
+func (x *FindExportersResponse) Reset() {
+	*x = FindExportersResponse{}
+	mi := &file_github_com_moby_buildkit_session_exporter_exporter_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *FindExportersResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FindExportersResponse) ProtoMessage() {}
+
+func (x *FindExportersResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_github_com_moby_buildkit_session_exporter_exporter_proto_msgTypes[1]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FindExportersResponse.ProtoReflect.Descriptor instead.
+func (*FindExportersResponse) Descriptor() ([]byte, []int) {
+	return file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *FindExportersResponse) GetExporters() []*ExporterRequest {
+	if x != nil {
+		return x.Exporters
+	}
+	return nil
+}
+
+type ExporterRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Type  string            `protobuf:"bytes,1,opt,name=Type,proto3" json:"Type,omitempty"`
+	Attrs map[string]string `protobuf:"bytes,2,rep,name=Attrs,proto3" json:"Attrs,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+}
+
+func (x *ExporterRequest) Reset() {
+	*x = ExporterRequest{}
+	mi := &file_github_com_moby_buildkit_session_exporter_exporter_proto_msgTypes[2]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ExporterRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ExporterRequest) ProtoMessage() {}
+
+func (x *ExporterRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_github_com_moby_buildkit_session_exporter_exporter_proto_msgTypes[2]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ExporterRequest.ProtoReflect.Descriptor instead.
+func (*ExporterRequest) Descriptor() ([]byte, []int) {
+	return file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *ExporterRequest) GetType() string {
+	if x != nil {
+		return x.Type
+	}
+	return ""
+}
+
+func (x *ExporterRequest) GetAttrs() map[string]string {
+	if x != nil {
+		return x.Attrs
+	}
+	return nil
+}
+
+var File_github_com_moby_buildkit_session_exporter_exporter_proto protoreflect.FileDescriptor
+
+var file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDesc = []byte{
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+	0x74, 0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescOnce sync.Once
+	file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescData = file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDesc
+)
+
+func file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescGZIP() []byte {
+	file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescOnce.Do(func() {
+		file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescData = protoimpl.X.CompressGZIP(file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescData)
+	})
+	return file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDescData
+}
+
+var file_github_com_moby_buildkit_session_exporter_exporter_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
+var file_github_com_moby_buildkit_session_exporter_exporter_proto_goTypes = []any{
+	(*FindExportersRequest)(nil),  // 0: moby.exporter.v1.FindExportersRequest
+	(*FindExportersResponse)(nil), // 1: moby.exporter.v1.FindExportersResponse
+	(*ExporterRequest)(nil),       // 2: moby.exporter.v1.ExporterRequest
+	nil,                           // 3: moby.exporter.v1.FindExportersRequest.MetadataEntry
+	nil,                           // 4: moby.exporter.v1.ExporterRequest.AttrsEntry
+}
+var file_github_com_moby_buildkit_session_exporter_exporter_proto_depIdxs = []int32{
+	3, // 0: moby.exporter.v1.FindExportersRequest.metadata:type_name -> moby.exporter.v1.FindExportersRequest.MetadataEntry
+	2, // 1: moby.exporter.v1.FindExportersResponse.exporters:type_name -> moby.exporter.v1.ExporterRequest
+	4, // 2: moby.exporter.v1.ExporterRequest.Attrs:type_name -> moby.exporter.v1.ExporterRequest.AttrsEntry
+	0, // 3: moby.exporter.v1.Exporter.FindExporters:input_type -> moby.exporter.v1.FindExportersRequest
+	1, // 4: moby.exporter.v1.Exporter.FindExporters:output_type -> moby.exporter.v1.FindExportersResponse
+	4, // [4:5] is the sub-list for method output_type
+	3, // [3:4] is the sub-list for method input_type
+	3, // [3:3] is the sub-list for extension type_name
+	3, // [3:3] is the sub-list for extension extendee
+	0, // [0:3] is the sub-list for field type_name
+}
+
+func init() { file_github_com_moby_buildkit_session_exporter_exporter_proto_init() }
+func file_github_com_moby_buildkit_session_exporter_exporter_proto_init() {
+	if File_github_com_moby_buildkit_session_exporter_exporter_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   5,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_github_com_moby_buildkit_session_exporter_exporter_proto_goTypes,
+		DependencyIndexes: file_github_com_moby_buildkit_session_exporter_exporter_proto_depIdxs,
+		MessageInfos:      file_github_com_moby_buildkit_session_exporter_exporter_proto_msgTypes,
+	}.Build()
+	File_github_com_moby_buildkit_session_exporter_exporter_proto = out.File
+	file_github_com_moby_buildkit_session_exporter_exporter_proto_rawDesc = nil
+	file_github_com_moby_buildkit_session_exporter_exporter_proto_goTypes = nil
+	file_github_com_moby_buildkit_session_exporter_exporter_proto_depIdxs = nil
+}
diff --git a/session/exporter/exporter.proto b/session/exporter/exporter.proto
new file mode 100644
index 000000000000..0a0423372696
--- /dev/null
+++ b/session/exporter/exporter.proto
@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+package moby.exporter.v1;
+
+option go_package = "github.com/moby/buildkit/session/exporter";
+
+service Exporter {
+	rpc FindExporters(FindExportersRequest) returns (FindExportersResponse);
+}
+
+message FindExportersRequest{
+	map<string, bytes> metadata = 1;
+	repeated string refs = 2;
+}
+
+message FindExportersResponse {
+	repeated ExporterRequest exporters = 1;
+}
+
+message ExporterRequest {
+	string Type = 1;
+	map<string, string> Attrs = 2;
+}
diff --git a/session/exporter/exporter_grpc.pb.go b/session/exporter/exporter_grpc.pb.go
new file mode 100644
index 000000000000..558dd1bd607b
--- /dev/null
+++ b/session/exporter/exporter_grpc.pb.go
@@ -0,0 +1,119 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v3.11.4
+// source: github.com/moby/buildkit/session/exporter/exporter.proto
+
+package exporter
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	Exporter_FindExporters_FullMethodName = "/moby.exporter.v1.Exporter/FindExporters"
+)
+
+// ExporterClient is the client API for Exporter service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type ExporterClient interface {
+	FindExporters(ctx context.Context, in *FindExportersRequest, opts ...grpc.CallOption) (*FindExportersResponse, error)
+}
+
+type exporterClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewExporterClient(cc grpc.ClientConnInterface) ExporterClient {
+	return &exporterClient{cc}
+}
+
+func (c *exporterClient) FindExporters(ctx context.Context, in *FindExportersRequest, opts ...grpc.CallOption) (*FindExportersResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(FindExportersResponse)
+	err := c.cc.Invoke(ctx, Exporter_FindExporters_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ExporterServer is the server API for Exporter service.
+// All implementations should embed UnimplementedExporterServer
+// for forward compatibility.
+type ExporterServer interface {
+	FindExporters(context.Context, *FindExportersRequest) (*FindExportersResponse, error)
+}
+
+// UnimplementedExporterServer should be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedExporterServer struct{}
+
+func (UnimplementedExporterServer) FindExporters(context.Context, *FindExportersRequest) (*FindExportersResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method FindExporters not implemented")
+}
+func (UnimplementedExporterServer) testEmbeddedByValue() {}
+
+// UnsafeExporterServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ExporterServer will
+// result in compilation errors.
+type UnsafeExporterServer interface {
+	mustEmbedUnimplementedExporterServer()
+}
+
+func RegisterExporterServer(s grpc.ServiceRegistrar, srv ExporterServer) {
+	// If the following call pancis, it indicates UnimplementedExporterServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&Exporter_ServiceDesc, srv)
+}
+
+func _Exporter_FindExporters_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(FindExportersRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ExporterServer).FindExporters(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: Exporter_FindExporters_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ExporterServer).FindExporters(ctx, req.(*FindExportersRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// Exporter_ServiceDesc is the grpc.ServiceDesc for Exporter service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Exporter_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "moby.exporter.v1.Exporter",
+	HandlerType: (*ExporterServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "FindExporters",
+			Handler:    _Exporter_FindExporters_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "github.com/moby/buildkit/session/exporter/exporter.proto",
+}
diff --git a/session/exporter/exporter_vtproto.pb.go b/session/exporter/exporter_vtproto.pb.go
new file mode 100644
index 000000000000..469754619d40
--- /dev/null
+++ b/session/exporter/exporter_vtproto.pb.go
@@ -0,0 +1,933 @@
+// Code generated by protoc-gen-go-vtproto. DO NOT EDIT.
+// protoc-gen-go-vtproto version: v0.6.1-0.20240319094008-0393e58bdf10
+// source: github.com/moby/buildkit/session/exporter/exporter.proto
+
+package exporter
+
+import (
+	fmt "fmt"
+	protohelpers "github.com/planetscale/vtprotobuf/protohelpers"
+	proto "google.golang.org/protobuf/proto"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	io "io"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+func (m *FindExportersRequest) CloneVT() *FindExportersRequest {
+	if m == nil {
+		return (*FindExportersRequest)(nil)
+	}
+	r := new(FindExportersRequest)
+	if rhs := m.Metadata; rhs != nil {
+		tmpContainer := make(map[string][]byte, len(rhs))
+		for k, v := range rhs {
+			tmpBytes := make([]byte, len(v))
+			copy(tmpBytes, v)
+			tmpContainer[k] = tmpBytes
+		}
+		r.Metadata = tmpContainer
+	}
+	if rhs := m.Refs; rhs != nil {
+		tmpContainer := make([]string, len(rhs))
+		copy(tmpContainer, rhs)
+		r.Refs = tmpContainer
+	}
+	if len(m.unknownFields) > 0 {
+		r.unknownFields = make([]byte, len(m.unknownFields))
+		copy(r.unknownFields, m.unknownFields)
+	}
+	return r
+}
+
+func (m *FindExportersRequest) CloneMessageVT() proto.Message {
+	return m.CloneVT()
+}
+
+func (m *FindExportersResponse) CloneVT() *FindExportersResponse {
+	if m == nil {
+		return (*FindExportersResponse)(nil)
+	}
+	r := new(FindExportersResponse)
+	if rhs := m.Exporters; rhs != nil {
+		tmpContainer := make([]*ExporterRequest, len(rhs))
+		for k, v := range rhs {
+			tmpContainer[k] = v.CloneVT()
+		}
+		r.Exporters = tmpContainer
+	}
+	if len(m.unknownFields) > 0 {
+		r.unknownFields = make([]byte, len(m.unknownFields))
+		copy(r.unknownFields, m.unknownFields)
+	}
+	return r
+}
+
+func (m *FindExportersResponse) CloneMessageVT() proto.Message {
+	return m.CloneVT()
+}
+
+func (m *ExporterRequest) CloneVT() *ExporterRequest {
+	if m == nil {
+		return (*ExporterRequest)(nil)
+	}
+	r := new(ExporterRequest)
+	r.Type = m.Type
+	if rhs := m.Attrs; rhs != nil {
+		tmpContainer := make(map[string]string, len(rhs))
+		for k, v := range rhs {
+			tmpContainer[k] = v
+		}
+		r.Attrs = tmpContainer
+	}
+	if len(m.unknownFields) > 0 {
+		r.unknownFields = make([]byte, len(m.unknownFields))
+		copy(r.unknownFields, m.unknownFields)
+	}
+	return r
+}
+
+func (m *ExporterRequest) CloneMessageVT() proto.Message {
+	return m.CloneVT()
+}
+
+func (this *FindExportersRequest) EqualVT(that *FindExportersRequest) bool {
+	if this == that {
+		return true
+	} else if this == nil || that == nil {
+		return false
+	}
+	if len(this.Metadata) != len(that.Metadata) {
+		return false
+	}
+	for i, vx := range this.Metadata {
+		vy, ok := that.Metadata[i]
+		if !ok {
+			return false
+		}
+		if string(vx) != string(vy) {
+			return false
+		}
+	}
+	if len(this.Refs) != len(that.Refs) {
+		return false
+	}
+	for i, vx := range this.Refs {
+		vy := that.Refs[i]
+		if vx != vy {
+			return false
+		}
+	}
+	return string(this.unknownFields) == string(that.unknownFields)
+}
+
+func (this *FindExportersRequest) EqualMessageVT(thatMsg proto.Message) bool {
+	that, ok := thatMsg.(*FindExportersRequest)
+	if !ok {
+		return false
+	}
+	return this.EqualVT(that)
+}
+func (this *FindExportersResponse) EqualVT(that *FindExportersResponse) bool {
+	if this == that {
+		return true
+	} else if this == nil || that == nil {
+		return false
+	}
+	if len(this.Exporters) != len(that.Exporters) {
+		return false
+	}
+	for i, vx := range this.Exporters {
+		vy := that.Exporters[i]
+		if p, q := vx, vy; p != q {
+			if p == nil {
+				p = &ExporterRequest{}
+			}
+			if q == nil {
+				q = &ExporterRequest{}
+			}
+			if !p.EqualVT(q) {
+				return false
+			}
+		}
+	}
+	return string(this.unknownFields) == string(that.unknownFields)
+}
+
+func (this *FindExportersResponse) EqualMessageVT(thatMsg proto.Message) bool {
+	that, ok := thatMsg.(*FindExportersResponse)
+	if !ok {
+		return false
+	}
+	return this.EqualVT(that)
+}
+func (this *ExporterRequest) EqualVT(that *ExporterRequest) bool {
+	if this == that {
+		return true
+	} else if this == nil || that == nil {
+		return false
+	}
+	if this.Type != that.Type {
+		return false
+	}
+	if len(this.Attrs) != len(that.Attrs) {
+		return false
+	}
+	for i, vx := range this.Attrs {
+		vy, ok := that.Attrs[i]
+		if !ok {
+			return false
+		}
+		if vx != vy {
+			return false
+		}
+	}
+	return string(this.unknownFields) == string(that.unknownFields)
+}
+
+func (this *ExporterRequest) EqualMessageVT(thatMsg proto.Message) bool {
+	that, ok := thatMsg.(*ExporterRequest)
+	if !ok {
+		return false
+	}
+	return this.EqualVT(that)
+}
+func (m *FindExportersRequest) MarshalVT() (dAtA []byte, err error) {
+	if m == nil {
+		return nil, nil
+	}
+	size := m.SizeVT()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBufferVT(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *FindExportersRequest) MarshalToVT(dAtA []byte) (int, error) {
+	size := m.SizeVT()
+	return m.MarshalToSizedBufferVT(dAtA[:size])
+}
+
+func (m *FindExportersRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
+	if m == nil {
+		return 0, nil
+	}
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.unknownFields != nil {
+		i -= len(m.unknownFields)
+		copy(dAtA[i:], m.unknownFields)
+	}
+	if len(m.Refs) > 0 {
+		for iNdEx := len(m.Refs) - 1; iNdEx >= 0; iNdEx-- {
+			i -= len(m.Refs[iNdEx])
+			copy(dAtA[i:], m.Refs[iNdEx])
+			i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Refs[iNdEx])))
+			i--
+			dAtA[i] = 0x12
+		}
+	}
+	if len(m.Metadata) > 0 {
+		for k := range m.Metadata {
+			v := m.Metadata[k]
+			baseI := i
+			i -= len(v)
+			copy(dAtA[i:], v)
+			i = protohelpers.EncodeVarint(dAtA, i, uint64(len(v)))
+			i--
+			dAtA[i] = 0x12
+			i -= len(k)
+			copy(dAtA[i:], k)
+			i = protohelpers.EncodeVarint(dAtA, i, uint64(len(k)))
+			i--
+			dAtA[i] = 0xa
+			i = protohelpers.EncodeVarint(dAtA, i, uint64(baseI-i))
+			i--
+			dAtA[i] = 0xa
+		}
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *FindExportersResponse) MarshalVT() (dAtA []byte, err error) {
+	if m == nil {
+		return nil, nil
+	}
+	size := m.SizeVT()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBufferVT(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *FindExportersResponse) MarshalToVT(dAtA []byte) (int, error) {
+	size := m.SizeVT()
+	return m.MarshalToSizedBufferVT(dAtA[:size])
+}
+
+func (m *FindExportersResponse) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
+	if m == nil {
+		return 0, nil
+	}
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.unknownFields != nil {
+		i -= len(m.unknownFields)
+		copy(dAtA[i:], m.unknownFields)
+	}
+	if len(m.Exporters) > 0 {
+		for iNdEx := len(m.Exporters) - 1; iNdEx >= 0; iNdEx-- {
+			size, err := m.Exporters[iNdEx].MarshalToSizedBufferVT(dAtA[:i])
+			if err != nil {
+				return 0, err
+			}
+			i -= size
+			i = protohelpers.EncodeVarint(dAtA, i, uint64(size))
+			i--
+			dAtA[i] = 0xa
+		}
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *ExporterRequest) MarshalVT() (dAtA []byte, err error) {
+	if m == nil {
+		return nil, nil
+	}
+	size := m.SizeVT()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBufferVT(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *ExporterRequest) MarshalToVT(dAtA []byte) (int, error) {
+	size := m.SizeVT()
+	return m.MarshalToSizedBufferVT(dAtA[:size])
+}
+
+func (m *ExporterRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
+	if m == nil {
+		return 0, nil
+	}
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.unknownFields != nil {
+		i -= len(m.unknownFields)
+		copy(dAtA[i:], m.unknownFields)
+	}
+	if len(m.Attrs) > 0 {
+		for k := range m.Attrs {
+			v := m.Attrs[k]
+			baseI := i
+			i -= len(v)
+			copy(dAtA[i:], v)
+			i = protohelpers.EncodeVarint(dAtA, i, uint64(len(v)))
+			i--
+			dAtA[i] = 0x12
+			i -= len(k)
+			copy(dAtA[i:], k)
+			i = protohelpers.EncodeVarint(dAtA, i, uint64(len(k)))
+			i--
+			dAtA[i] = 0xa
+			i = protohelpers.EncodeVarint(dAtA, i, uint64(baseI-i))
+			i--
+			dAtA[i] = 0x12
+		}
+	}
+	if len(m.Type) > 0 {
+		i -= len(m.Type)
+		copy(dAtA[i:], m.Type)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Type)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *FindExportersRequest) SizeVT() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if len(m.Metadata) > 0 {
+		for k, v := range m.Metadata {
+			_ = k
+			_ = v
+			l = 1 + len(v) + protohelpers.SizeOfVarint(uint64(len(v)))
+			mapEntrySize := 1 + len(k) + protohelpers.SizeOfVarint(uint64(len(k))) + l
+			n += mapEntrySize + 1 + protohelpers.SizeOfVarint(uint64(mapEntrySize))
+		}
+	}
+	if len(m.Refs) > 0 {
+		for _, s := range m.Refs {
+			l = len(s)
+			n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
+		}
+	}
+	n += len(m.unknownFields)
+	return n
+}
+
+func (m *FindExportersResponse) SizeVT() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if len(m.Exporters) > 0 {
+		for _, e := range m.Exporters {
+			l = e.SizeVT()
+			n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
+		}
+	}
+	n += len(m.unknownFields)
+	return n
+}
+
+func (m *ExporterRequest) SizeVT() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Type)
+	if l > 0 {
+		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
+	}
+	if len(m.Attrs) > 0 {
+		for k, v := range m.Attrs {
+			_ = k
+			_ = v
+			mapEntrySize := 1 + len(k) + protohelpers.SizeOfVarint(uint64(len(k))) + 1 + len(v) + protohelpers.SizeOfVarint(uint64(len(v)))
+			n += mapEntrySize + 1 + protohelpers.SizeOfVarint(uint64(mapEntrySize))
+		}
+	}
+	n += len(m.unknownFields)
+	return n
+}
+
+func (m *FindExportersRequest) UnmarshalVT(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 protohelpers.ErrIntOverflow
+			}
+			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: FindExportersRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: FindExportersRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Metadata", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Metadata == nil {
+				m.Metadata = make(map[string][]byte)
+			}
+			var mapkey string
+			var mapvalue []byte
+			for iNdEx < postIndex {
+				entryPreIndex := iNdEx
+				var wire uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return protohelpers.ErrIntOverflow
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					wire |= uint64(b&0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				fieldNum := int32(wire >> 3)
+				if fieldNum == 1 {
+					var stringLenmapkey uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return protohelpers.ErrIntOverflow
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						stringLenmapkey |= uint64(b&0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					intStringLenmapkey := int(stringLenmapkey)
+					if intStringLenmapkey < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					postStringIndexmapkey := iNdEx + intStringLenmapkey
+					if postStringIndexmapkey < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					if postStringIndexmapkey > l {
+						return io.ErrUnexpectedEOF
+					}
+					mapkey = string(dAtA[iNdEx:postStringIndexmapkey])
+					iNdEx = postStringIndexmapkey
+				} else if fieldNum == 2 {
+					var mapbyteLen uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return protohelpers.ErrIntOverflow
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						mapbyteLen |= uint64(b&0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					intMapbyteLen := int(mapbyteLen)
+					if intMapbyteLen < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					postbytesIndex := iNdEx + intMapbyteLen
+					if postbytesIndex < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					if postbytesIndex > l {
+						return io.ErrUnexpectedEOF
+					}
+					mapvalue = make([]byte, mapbyteLen)
+					copy(mapvalue, dAtA[iNdEx:postbytesIndex])
+					iNdEx = postbytesIndex
+				} else {
+					iNdEx = entryPreIndex
+					skippy, err := protohelpers.Skip(dAtA[iNdEx:])
+					if err != nil {
+						return err
+					}
+					if (skippy < 0) || (iNdEx+skippy) < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					if (iNdEx + skippy) > postIndex {
+						return io.ErrUnexpectedEOF
+					}
+					iNdEx += skippy
+				}
+			}
+			m.Metadata[mapkey] = mapvalue
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Refs", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				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 protohelpers.ErrInvalidLength
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Refs = append(m.Refs, string(dAtA[iNdEx:postIndex]))
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.unknownFields = append(m.unknownFields, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *FindExportersResponse) UnmarshalVT(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 protohelpers.ErrIntOverflow
+			}
+			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: FindExportersResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: FindExportersResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Exporters", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Exporters = append(m.Exporters, &ExporterRequest{})
+			if err := m.Exporters[len(m.Exporters)-1].UnmarshalVT(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.unknownFields = append(m.unknownFields, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *ExporterRequest) UnmarshalVT(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 protohelpers.ErrIntOverflow
+			}
+			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: ExporterRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ExporterRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Type", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				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 protohelpers.ErrInvalidLength
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Type = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Attrs", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Attrs == nil {
+				m.Attrs = make(map[string]string)
+			}
+			var mapkey string
+			var mapvalue string
+			for iNdEx < postIndex {
+				entryPreIndex := iNdEx
+				var wire uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return protohelpers.ErrIntOverflow
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					wire |= uint64(b&0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				fieldNum := int32(wire >> 3)
+				if fieldNum == 1 {
+					var stringLenmapkey uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return protohelpers.ErrIntOverflow
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						stringLenmapkey |= uint64(b&0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					intStringLenmapkey := int(stringLenmapkey)
+					if intStringLenmapkey < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					postStringIndexmapkey := iNdEx + intStringLenmapkey
+					if postStringIndexmapkey < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					if postStringIndexmapkey > l {
+						return io.ErrUnexpectedEOF
+					}
+					mapkey = string(dAtA[iNdEx:postStringIndexmapkey])
+					iNdEx = postStringIndexmapkey
+				} else if fieldNum == 2 {
+					var stringLenmapvalue uint64
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return protohelpers.ErrIntOverflow
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						stringLenmapvalue |= uint64(b&0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					intStringLenmapvalue := int(stringLenmapvalue)
+					if intStringLenmapvalue < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					postStringIndexmapvalue := iNdEx + intStringLenmapvalue
+					if postStringIndexmapvalue < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					if postStringIndexmapvalue > l {
+						return io.ErrUnexpectedEOF
+					}
+					mapvalue = string(dAtA[iNdEx:postStringIndexmapvalue])
+					iNdEx = postStringIndexmapvalue
+				} else {
+					iNdEx = entryPreIndex
+					skippy, err := protohelpers.Skip(dAtA[iNdEx:])
+					if err != nil {
+						return err
+					}
+					if (skippy < 0) || (iNdEx+skippy) < 0 {
+						return protohelpers.ErrInvalidLength
+					}
+					if (iNdEx + skippy) > postIndex {
+						return io.ErrUnexpectedEOF
+					}
+					iNdEx += skippy
+				}
+			}
+			m.Attrs[mapkey] = mapvalue
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.unknownFields = append(m.unknownFields, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
diff --git a/session/exporter/exporterprovider/provider.go b/session/exporter/exporterprovider/provider.go
new file mode 100644
index 000000000000..abdc28894072
--- /dev/null
+++ b/session/exporter/exporterprovider/provider.go
@@ -0,0 +1,39 @@
+package exporterprovider
+
+import (
+	"context"
+
+	"github.com/moby/buildkit/session/exporter"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+type Callback func(ctx context.Context, md map[string][]byte, refs []string) ([]*exporter.ExporterRequest, error)
+
+func New(cb Callback) *Exporter {
+	return &Exporter{
+		cb: cb,
+	}
+}
+
+type Exporter struct {
+	cb Callback
+}
+
+func (e *Exporter) Register(server *grpc.Server) {
+	exporter.RegisterExporterServer(server, e)
+}
+
+func (e *Exporter) FindExporters(ctx context.Context, in *exporter.FindExportersRequest) (*exporter.FindExportersResponse, error) {
+	if e.cb == nil {
+		return nil, status.Errorf(codes.Unavailable, "no exporter callback registered")
+	}
+	res, err := e.cb(ctx, in.Metadata, in.Refs)
+	if err != nil {
+		return nil, err
+	}
+	return &exporter.FindExportersResponse{
+		Exporters: res,
+	}, nil
+}
diff --git a/session/filesync/diffcopy.go b/session/filesync/diffcopy.go
index edf6ce41b653..5176b5c03fa5 100644
--- a/session/filesync/diffcopy.go
+++ b/session/filesync/diffcopy.go
@@ -83,7 +83,7 @@ func (wc *streamWriterCloser) Close() error {
 	return nil
 }
 
-func recvDiffCopy(ds grpc.ClientStream, dest string, cu CacheUpdater, progress progressCb, differ fsutil.DiffType, filter func(string, *fstypes.Stat) bool) (err error) {
+func recvDiffCopy(ds grpc.ClientStream, dest string, cu CacheUpdater, progress progressCb, differ fsutil.DiffType, filter, metadataOnlyFilter func(string, *fstypes.Stat) bool) (err error) {
 	st := time.Now()
 	defer func() {
 		bklog.G(ds.Context()).Debugf("diffcopy took: %v", time.Since(st))
@@ -107,6 +107,7 @@ func recvDiffCopy(ds grpc.ClientStream, dest string, cu CacheUpdater, progress p
 		ProgressCb:    progress,
 		Filter:        fsutil.FilterFunc(filter),
 		Differ:        differ,
+		MetadataOnly:  metadataOnlyFilter,
 	}))
 }
 
diff --git a/session/filesync/filesync.go b/session/filesync/filesync.go
index 4c7e4b233739..2a402e445a12 100644
--- a/session/filesync/filesync.go
+++ b/session/filesync/filesync.go
@@ -3,7 +3,7 @@ package filesync
 import (
 	"context"
 	"fmt"
-	io "io"
+	"io"
 	"net/url"
 	"os"
 	"strconv"
@@ -145,7 +145,7 @@ type progressCb func(int, bool)
 type protocol struct {
 	name   string
 	sendFn func(stream Stream, fs fsutil.FS, progress progressCb) error
-	recvFn func(stream grpc.ClientStream, destDir string, cu CacheUpdater, progress progressCb, differ fsutil.DiffType, mapFunc func(string, *fstypes.Stat) bool) error
+	recvFn func(stream grpc.ClientStream, destDir string, cu CacheUpdater, progress progressCb, differ fsutil.DiffType, mapFunc, metadataOnlyFilter func(string, *fstypes.Stat) bool) error
 }
 
 var supportedProtocols = []protocol{
@@ -158,15 +158,17 @@ var supportedProtocols = []protocol{
 
 // FSSendRequestOpt defines options for FSSend request
 type FSSendRequestOpt struct {
-	Name            string
-	IncludePatterns []string
-	ExcludePatterns []string
-	FollowPaths     []string
-	DestDir         string
-	CacheUpdater    CacheUpdater
-	ProgressCb      func(int, bool)
-	Filter          func(string, *fstypes.Stat) bool
-	Differ          fsutil.DiffType
+	Name               string
+	IncludePatterns    []string
+	ExcludePatterns    []string
+	FollowPaths        []string
+	DestDir            string
+	CacheUpdater       CacheUpdater
+	ProgressCb         func(int, bool)
+	Filter             func(string, *fstypes.Stat) bool
+	Differ             fsutil.DiffType
+	MetadataOnly       bool
+	MetadataOnlyFilter func(string, *fstypes.Stat) bool
 }
 
 // CacheUpdater is an object capable of sending notifications for the cache hash changes
@@ -233,7 +235,16 @@ func FSSync(ctx context.Context, c session.Caller, opt FSSendRequestOpt) error {
 		panic(fmt.Sprintf("invalid protocol: %q", pr.name))
 	}
 
-	return pr.recvFn(stream, opt.DestDir, opt.CacheUpdater, opt.ProgressCb, opt.Differ, opt.Filter)
+	var metadataOnlyFilter func(string, *fstypes.Stat) bool
+	if opt.MetadataOnly {
+		if opt.MetadataOnlyFilter != nil {
+			metadataOnlyFilter = opt.MetadataOnlyFilter
+		} else {
+			metadataOnlyFilter = func(string, *fstypes.Stat) bool { return false }
+		}
+	}
+
+	return pr.recvFn(stream, opt.DestDir, opt.CacheUpdater, opt.ProgressCb, opt.Differ, opt.Filter, metadataOnlyFilter)
 }
 
 type FSSyncTarget interface {
@@ -264,34 +275,39 @@ func WithFSSyncDir(id int, outdir string) FSSyncTarget {
 	}
 }
 
-func NewFSSyncTarget(targets ...FSSyncTarget) session.Attachable {
-	fs := make(map[int]FileOutputFunc)
-	outdirs := make(map[int]string)
+func NewFSSyncTarget(targets ...FSSyncTarget) *SyncTarget {
+	st := &SyncTarget{
+		fs:      make(map[int]FileOutputFunc),
+		outdirs: make(map[int]string),
+	}
+	st.Add(targets...)
+	return st
+}
+
+type SyncTarget struct {
+	fs      map[int]FileOutputFunc
+	outdirs map[int]string
+}
+
+var _ session.Attachable = &SyncTarget{}
+
+func (sp *SyncTarget) Add(targets ...FSSyncTarget) {
 	for _, t := range targets {
 		t := t.target()
 		if t.f != nil {
-			fs[t.id] = t.f
+			sp.fs[t.id] = t.f
 		}
 		if t.outdir != "" {
-			outdirs[t.id] = t.outdir
+			sp.outdirs[t.id] = t.outdir
 		}
 	}
-	return &fsSyncAttachable{
-		fs:      fs,
-		outdirs: outdirs,
-	}
-}
-
-type fsSyncAttachable struct {
-	fs      map[int]FileOutputFunc
-	outdirs map[int]string
 }
 
-func (sp *fsSyncAttachable) Register(server *grpc.Server) {
+func (sp *SyncTarget) Register(server *grpc.Server) {
 	RegisterFileSendServer(server, sp)
 }
 
-func (sp *fsSyncAttachable) chooser(ctx context.Context) int {
+func (sp *SyncTarget) chooser(ctx context.Context) int {
 	md, ok := metadata.FromIncomingContext(ctx)
 	if !ok {
 		return 0
@@ -307,7 +323,7 @@ func (sp *fsSyncAttachable) chooser(ctx context.Context) int {
 	return int(id)
 }
 
-func (sp *fsSyncAttachable) DiffCopy(stream FileSend_DiffCopyServer) (err error) {
+func (sp *SyncTarget) DiffCopy(stream FileSend_DiffCopyServer) (err error) {
 	id := sp.chooser(stream.Context())
 	if outdir, ok := sp.outdirs[id]; ok {
 		return syncTargetDiffCopy(stream, outdir)
diff --git a/solver/llbsolver/solver.go b/solver/llbsolver/solver.go
index fdf9abc36b63..32ca3da84a9f 100644
--- a/solver/llbsolver/solver.go
+++ b/solver/llbsolver/solver.go
@@ -29,6 +29,7 @@ import (
 	"github.com/moby/buildkit/frontend/gateway"
 	"github.com/moby/buildkit/identity"
 	"github.com/moby/buildkit/session"
+	sessionexporter "github.com/moby/buildkit/session/exporter"
 	"github.com/moby/buildkit/solver"
 	"github.com/moby/buildkit/solver/llbsolver/provenance"
 	"github.com/moby/buildkit/solver/result"
@@ -36,6 +37,7 @@ import (
 	"github.com/moby/buildkit/util/bklog"
 	"github.com/moby/buildkit/util/compression"
 	"github.com/moby/buildkit/util/entitlements"
+	"github.com/moby/buildkit/util/grpcerrors"
 	"github.com/moby/buildkit/util/leaseutil"
 	"github.com/moby/buildkit/util/progress"
 	"github.com/moby/buildkit/util/tracing"
@@ -44,6 +46,7 @@ import (
 	digest "github.com/opencontainers/go-digest"
 	"github.com/pkg/errors"
 	"golang.org/x/sync/errgroup"
+	"google.golang.org/grpc/codes"
 	"google.golang.org/protobuf/types/known/timestamppb"
 )
 
@@ -53,8 +56,9 @@ const (
 )
 
 type ExporterRequest struct {
-	Exporters      []exporter.ExporterInstance
-	CacheExporters []RemoteCacheExporter
+	Exporters             []exporter.ExporterInstance
+	CacheExporters        []RemoteCacheExporter
+	EnableSessionExporter bool
 }
 
 type RemoteCacheExporter struct {
@@ -631,6 +635,14 @@ func (s *Solver) Solve(ctx context.Context, id string, sessionID string, req fro
 
 	cacheExporters, inlineCacheExporter := splitCacheExporters(exp.CacheExporters)
 
+	if exp.EnableSessionExporter {
+		exporters, err := s.getSessionExporters(ctx, j.SessionID, len(exp.Exporters), inp)
+		if err != nil {
+			return nil, err
+		}
+		exp.Exporters = append(exp.Exporters, exporters...)
+	}
+
 	var exporterResponse map[string]string
 	exporterResponse, descrefs, err = s.runExporters(ctx, exp.Exporters, inlineCacheExporter, j, cached, inp)
 	if err != nil {
@@ -662,6 +674,59 @@ func (s *Solver) Solve(ctx context.Context, id string, sessionID string, req fro
 	}, nil
 }
 
+func (s *Solver) getSessionExporters(ctx context.Context, sessionID string, id int, inp *exporter.Source) ([]exporter.ExporterInstance, error) {
+	timeoutCtx, cancel := context.WithCancelCause(ctx)
+	timeoutCtx, _ = context.WithTimeoutCause(timeoutCtx, 5*time.Second, errors.WithStack(context.DeadlineExceeded))
+	defer func() { cancel(errors.WithStack(context.Canceled)) }()
+
+	caller, err := s.sm.Get(timeoutCtx, sessionID, false)
+	if err != nil {
+		return nil, err
+	}
+
+	client := sessionexporter.NewExporterClient(caller.Conn())
+
+	var ids []string
+	if err := inp.EachRef(func(ref cache.ImmutableRef) error {
+		ids = append(ids, ref.ID())
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	res, err := client.FindExporters(ctx, &sessionexporter.FindExportersRequest{
+		Metadata: inp.Metadata,
+		Refs:     ids,
+	})
+	if err != nil {
+		switch grpcerrors.Code(err) {
+		case codes.Unavailable, codes.Unimplemented:
+			return nil, nil
+		default:
+			return nil, err
+		}
+	}
+
+	w, err := defaultResolver(s.workerController)()
+	if err != nil {
+		return nil, err
+	}
+
+	var out []exporter.ExporterInstance
+	for i, req := range res.Exporters {
+		exp, err := w.Exporter(req.Type, s.sm)
+		if err != nil {
+			return nil, err
+		}
+		expi, err := exp.Resolve(ctx, id+i, req.Attrs)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, expi)
+	}
+	return out, nil
+}
+
 func validateSourcePolicy(pol *spb.Policy) error {
 	for _, r := range pol.Rules {
 		if r == nil {
@@ -750,7 +815,7 @@ func runInlineCacheExporter(ctx context.Context, e exporter.ExporterInstance, in
 	return res, done(err)
 }
 
-func (s *Solver) runExporters(ctx context.Context, exporters []exporter.ExporterInstance, inlineCacheExporter inlineCacheExporter, job *solver.Job, cached *result.Result[solver.CachedResult], inp *result.Result[cache.ImmutableRef]) (exporterResponse map[string]string, descrefs []exporter.DescriptorReference, err error) {
+func (s *Solver) runExporters(ctx context.Context, exporters []exporter.ExporterInstance, inlineCacheExporter inlineCacheExporter, job *solver.Job, cached *result.Result[solver.CachedResult], inp *exporter.Source) (exporterResponse map[string]string, descrefs []exporter.DescriptorReference, err error) {
 	warnings, err := verifier.CheckInvalidPlatforms(ctx, inp)
 	if err != nil {
 		return nil, nil, err
diff --git a/solver/pb/attr.go b/solver/pb/attr.go
index 473ac05efaff..b18223dcdc6a 100644
--- a/solver/pb/attr.go
+++ b/solver/pb/attr.go
@@ -12,6 +12,8 @@ const AttrIncludePatterns = "local.includepattern"
 const AttrFollowPaths = "local.followpaths"
 const AttrExcludePatterns = "local.excludepatterns"
 const AttrSharedKeyHint = "local.sharedkeyhint"
+const AttrMetadataTransfer = "local.metadatatransfer"
+const AttrMetadataTransferExclude = "local.metadatatransferexclude"
 
 const AttrLLBDefinitionFilename = "llbbuild.filename"
 
diff --git a/solver/pb/caps.go b/solver/pb/caps.go
index 16b546d78716..ce5b0d4ea9d2 100644
--- a/solver/pb/caps.go
+++ b/solver/pb/caps.go
@@ -21,6 +21,7 @@ const (
 	CapSourceLocalExcludePatterns apicaps.CapID = "source.local.excludepatterns"
 	CapSourceLocalSharedKeyHint   apicaps.CapID = "source.local.sharedkeyhint"
 	CapSourceLocalDiffer          apicaps.CapID = "source.local.differ"
+	CapSourceMetadataTransfer     apicaps.CapID = "source.local.metadatatransfer"
 
 	CapSourceGit              apicaps.CapID = "source.git"
 	CapSourceGitKeepDir       apicaps.CapID = "source.git.keepgitdir"
@@ -95,6 +96,7 @@ const (
 	CapSourceDateEpoch apicaps.CapID = "exporter.sourcedateepoch"
 
 	CapMultipleExporters apicaps.CapID = "exporter.multiple"
+	CapSessionExporter   apicaps.CapID = "exporter.session"
 
 	CapSourcePolicy apicaps.CapID = "source.policy"
 
@@ -172,6 +174,12 @@ func init() {
 		Status:  apicaps.CapStatusExperimental,
 	})
 
+	Caps.Init(apicaps.Cap{
+		ID:      CapSourceMetadataTransfer,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
 	Caps.Init(apicaps.Cap{
 		ID:      CapSourceGit,
 		Enabled: true,
@@ -519,6 +527,12 @@ func init() {
 		Status:  apicaps.CapStatusExperimental,
 	})
 
+	Caps.Init(apicaps.Cap{
+		ID:      CapSessionExporter,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
 	Caps.Init(apicaps.Cap{
 		ID:      CapSourcePolicy,
 		Enabled: true,
diff --git a/source/local/identifier.go b/source/local/identifier.go
index 5bc63206bc26..32662302a8f4 100644
--- a/source/local/identifier.go
+++ b/source/local/identifier.go
@@ -9,13 +9,15 @@ import (
 )
 
 type LocalIdentifier struct {
-	Name            string
-	SessionID       string
-	IncludePatterns []string
-	ExcludePatterns []string
-	FollowPaths     []string
-	SharedKeyHint   string
-	Differ          fsutil.DiffType
+	Name               string
+	SessionID          string
+	IncludePatterns    []string
+	ExcludePatterns    []string
+	FollowPaths        []string
+	SharedKeyHint      string
+	Differ             fsutil.DiffType
+	MetadataOnly       bool
+	MetadataExceptions []string
 }
 
 func NewLocalIdentifier(str string) (*LocalIdentifier, error) {
diff --git a/source/local/source.go b/source/local/source.go
index 5f6485a66e06..db4f9fe67691 100644
--- a/source/local/source.go
+++ b/source/local/source.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"strconv"
 	"strings"
 	"time"
 
@@ -19,6 +20,7 @@ import (
 	srctypes "github.com/moby/buildkit/source/types"
 	"github.com/moby/buildkit/util/bklog"
 	"github.com/moby/buildkit/util/progress"
+	"github.com/moby/patternmatcher"
 	"github.com/moby/sys/user"
 	digest "github.com/opencontainers/go-digest"
 	"github.com/pkg/errors"
@@ -87,6 +89,18 @@ func (ls *localSource) Identifier(scheme, ref string, attrs map[string]string, p
 			case pb.AttrLocalDifferNone:
 				id.Differ = fsutil.DiffNone
 			}
+		case pb.AttrMetadataTransfer:
+			b, err := strconv.ParseBool(v)
+			if err != nil {
+				return nil, errors.Wrapf(err, "invalid value for local.metadatatransfer %q", v)
+			}
+			id.MetadataOnly = b
+		case pb.AttrMetadataTransferExclude:
+			var exceptions []string
+			if err := json.Unmarshal([]byte(v), &exceptions); err != nil {
+				return nil, err
+			}
+			id.MetadataExceptions = exceptions
 		}
 	}
 
@@ -123,11 +137,20 @@ func (ls *localSourceHandler) CacheKey(ctx context.Context, g session.Group, ind
 		sessionID = id
 	}
 	dt, err := json.Marshal(struct {
-		SessionID       string
-		IncludePatterns []string
-		ExcludePatterns []string
-		FollowPaths     []string
-	}{SessionID: sessionID, IncludePatterns: ls.src.IncludePatterns, ExcludePatterns: ls.src.ExcludePatterns, FollowPaths: ls.src.FollowPaths})
+		SessionID          string
+		IncludePatterns    []string
+		ExcludePatterns    []string
+		FollowPaths        []string
+		MetadataTransfer   bool     `json:",omitempty"`
+		MetadataExceptions []string `json:",omitempty"`
+	}{
+		SessionID:          sessionID,
+		IncludePatterns:    ls.src.IncludePatterns,
+		ExcludePatterns:    ls.src.ExcludePatterns,
+		FollowPaths:        ls.src.FollowPaths,
+		MetadataTransfer:   ls.src.MetadataOnly,
+		MetadataExceptions: ls.src.MetadataExceptions,
+	})
 	if err != nil {
 		return "", "", nil, false, err
 	}
@@ -174,7 +197,11 @@ func (ls *localSourceHandler) snapshotWithAnySession(ctx context.Context, g sess
 }
 
 func (ls *localSourceHandler) snapshot(ctx context.Context, caller session.Caller) (out cache.ImmutableRef, retErr error) {
-	sharedKey := ls.src.Name + ":" + ls.src.SharedKeyHint + ":" + caller.SharedKey() // TODO: replace caller.SharedKey() with source based hint from client(absolute-path+nodeid)
+	metaSfx := ""
+	if ls.src.MetadataOnly {
+		metaSfx = ":metadata"
+	}
+	sharedKey := ls.src.Name + ":" + ls.src.SharedKeyHint + ":" + caller.SharedKey() + metaSfx // TODO: replace caller.SharedKey() with source based hint from client(absolute-path+nodeid)
 
 	var mutable cache.MutableRef
 	sis, err := searchSharedKey(ctx, ls.cm, sharedKey)
@@ -243,6 +270,18 @@ func (ls *localSourceHandler) snapshot(ctx context.Context, caller session.Calle
 		CacheUpdater:    &cacheUpdater{cc, mount.IdentityMapping()},
 		ProgressCb:      newProgressHandler(ctx, "transferring "+ls.src.Name+":"),
 		Differ:          ls.src.Differ,
+		MetadataOnly:    ls.src.MetadataOnly,
+	}
+
+	if opt.MetadataOnly && len(ls.src.MetadataExceptions) > 0 {
+		matcher, err := patternmatcher.New(ls.src.MetadataExceptions)
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+		opt.MetadataOnlyFilter = func(p string, _ *fstypes.Stat) bool {
+			v, err := matcher.MatchesOrParentMatches(p)
+			return err == nil && v
+		}
 	}
 
 	if idmap := mount.IdentityMapping(); idmap != nil {
diff --git a/vendor/github.com/tonistiigi/fsutil/buffer.go b/vendor/github.com/tonistiigi/fsutil/buffer.go
new file mode 100644
index 000000000000..09d94acbd38e
--- /dev/null
+++ b/vendor/github.com/tonistiigi/fsutil/buffer.go
@@ -0,0 +1,44 @@
+package fsutil
+
+import (
+	"io"
+)
+
+const chunkSize = 32 * 1024
+
+type buffer struct {
+	chunks [][]byte
+}
+
+func (b *buffer) alloc(n int) []byte {
+	if n > chunkSize {
+		buf := make([]byte, n)
+		b.chunks = append(b.chunks, buf)
+		return buf
+	}
+
+	if len(b.chunks) != 0 {
+		lastChunk := b.chunks[len(b.chunks)-1]
+		l := len(lastChunk)
+		if l+n <= cap(lastChunk) {
+			lastChunk = lastChunk[:l+n]
+			b.chunks[len(b.chunks)-1] = lastChunk
+			return lastChunk[l : l+n]
+		}
+	}
+
+	buf := make([]byte, n, chunkSize)
+	b.chunks = append(b.chunks, buf)
+	return buf
+}
+
+func (b *buffer) WriteTo(w io.Writer) (n int64, err error) {
+	for _, c := range b.chunks {
+		m, err := w.Write(c)
+		n += int64(m)
+		if err != nil {
+			return n, err
+		}
+	}
+	return n, nil
+}
diff --git a/vendor/github.com/tonistiigi/fsutil/receive.go b/vendor/github.com/tonistiigi/fsutil/receive.go
index 2f94778a2f59..57d903c5d1d9 100644
--- a/vendor/github.com/tonistiigi/fsutil/receive.go
+++ b/vendor/github.com/tonistiigi/fsutil/receive.go
@@ -32,6 +32,7 @@ package fsutil
 
 import (
 	"context"
+	"encoding/binary"
 	"io"
 	"os"
 	"path/filepath"
@@ -51,6 +52,8 @@ const (
 	DiffContent
 )
 
+const metadataPath = ".fsutil-metadata"
+
 type ReceiveOpt struct {
 	NotifyHashed  ChangeFunc
 	ContentHasher ContentHasher
@@ -58,6 +61,7 @@ type ReceiveOpt struct {
 	Merge         bool
 	Filter        FilterFunc
 	Differ        DiffType
+	MetadataOnly  FilterFunc
 }
 
 func Receive(ctx context.Context, conn Stream, dest string, opt ReceiveOpt) error {
@@ -75,21 +79,23 @@ func Receive(ctx context.Context, conn Stream, dest string, opt ReceiveOpt) erro
 		merge:         opt.Merge,
 		filter:        opt.Filter,
 		differ:        opt.Differ,
+		metadataOnly:  opt.MetadataOnly,
 	}
 	return r.run(ctx)
 }
 
 type receiver struct {
-	dest       string
-	conn       Stream
-	files      map[string]uint32
-	pipes      map[uint32]io.WriteCloser
-	mu         sync.RWMutex
-	muPipes    sync.RWMutex
-	progressCb func(int, bool)
-	merge      bool
-	filter     FilterFunc
-	differ     DiffType
+	dest         string
+	conn         Stream
+	files        map[string]uint32
+	pipes        map[uint32]io.WriteCloser
+	mu           sync.RWMutex
+	muPipes      sync.RWMutex
+	progressCb   func(int, bool)
+	merge        bool
+	filter       FilterFunc
+	differ       DiffType
+	metadataOnly FilterFunc
 
 	notifyHashed   ChangeFunc
 	contentHasher  ContentHasher
@@ -164,6 +170,11 @@ func (r *receiver) run(ctx context.Context) error {
 	}
 
 	w := newDynamicWalker()
+	metadataTransfer := r.metadataOnly != nil
+	// buffer Stat metadata in framed proto
+	metadataBuffer := &buffer{}
+	// stack of parent paths that can be replayed if metadata filter matches
+	metadataParents := newStack[*currentPath]()
 
 	g.Go(func() (retErr error) {
 		defer func() {
@@ -223,10 +234,26 @@ func (r *receiver) run(ctx context.Context) error {
 					// e.g. a linux path foo/bar\baz cannot be represented on windows
 					return errors.WithStack(&os.PathError{Path: p.Stat.Path, Err: syscall.EINVAL, Op: "unrepresentable path"})
 				}
+				var metaOnly bool
+				if metadataTransfer {
+					if path == metadataPath {
+						continue
+					}
+					n := p.Stat.SizeVT()
+					dt := metadataBuffer.alloc(n + 4)
+					binary.LittleEndian.PutUint32(dt[0:4], uint32(n))
+					_, err := p.Stat.MarshalToSizedBufferVT(dt[4:])
+					if err != nil {
+						return err
+					}
+					if !r.metadataOnly(path, p.Stat) {
+						metaOnly = true
+					}
+				}
 				p.Stat.Path = path
 				p.Stat.Linkname = filepath.FromSlash(p.Stat.Linkname)
 
-				if fileCanRequestData(os.FileMode(p.Stat.Mode)) {
+				if !metaOnly && fileCanRequestData(os.FileMode(p.Stat.Mode)) {
 					r.mu.Lock()
 					r.files[p.Stat.Path] = i
 					r.mu.Unlock()
@@ -240,6 +267,31 @@ func (r *receiver) run(ctx context.Context) error {
 				if err := r.hlValidator.HandleChange(ChangeKindAdd, cp.path, &StatInfo{cp.stat}, nil); err != nil {
 					return err
 				}
+				if metadataTransfer {
+					parent := filepath.Dir(cp.path)
+					isDir := os.FileMode(p.Stat.Mode).IsDir()
+					for {
+						last, ok := metadataParents.peek()
+						if !ok || parent == last.path {
+							break
+						}
+						metadataParents.pop()
+					}
+					if isDir {
+						metadataParents.push(cp)
+					}
+					if metaOnly {
+						continue
+					} else {
+						for _, cp := range metadataParents.items {
+							if err := w.update(cp); err != nil {
+								return err
+							}
+						}
+						metadataParents.clear()
+					}
+				}
+
 				if err := w.update(cp); err != nil {
 					return err
 				}
@@ -272,7 +324,27 @@ func (r *receiver) run(ctx context.Context) error {
 			}
 		}
 	})
-	return g.Wait()
+
+	if err := g.Wait(); err != nil {
+		return err
+	}
+
+	if !metadataTransfer {
+		return nil
+	}
+
+	// although we don't allow tranferring metadataPath, make sure there was no preexisting file/symlink
+	os.Remove(filepath.Join(r.dest, metadataPath))
+
+	f, err := os.OpenFile(filepath.Join(r.dest, metadataPath), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	if err != nil {
+		return err
+	}
+	if _, err := metadataBuffer.WriteTo(f); err != nil {
+		f.Close()
+		return err
+	}
+	return f.Close()
 }
 
 func (r *receiver) asyncDataFunc(ctx context.Context, p string, wc io.WriteCloser) error {
@@ -327,3 +399,39 @@ func (w *wrappedWriteCloser) Wait(ctx context.Context) error {
 		return w.err
 	}
 }
+
+type stack[T any] struct {
+	items []T
+}
+
+func newStack[T any]() *stack[T] {
+	return &stack[T]{
+		items: make([]T, 0, 8),
+	}
+}
+
+func (s *stack[T]) push(v T) {
+	s.items = append(s.items, v)
+}
+
+func (s *stack[T]) pop() (T, bool) {
+	if len(s.items) == 0 {
+		var zero T
+		return zero, false
+	}
+	v := s.items[len(s.items)-1]
+	s.items = s.items[:len(s.items)-1]
+	return v, true
+}
+
+func (s *stack[T]) peek() (T, bool) {
+	if len(s.items) == 0 {
+		var zero T
+		return zero, false
+	}
+	return s.items[len(s.items)-1], true
+}
+
+func (s *stack[T]) clear() {
+	s.items = s.items[:0]
+}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 96b053cae213..dd1b2f13326a 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -779,7 +779,7 @@ github.com/syndtr/gocapability/capability
 # github.com/tonistiigi/dchapes-mode v0.0.0-20250318174251-73d941a28323
 ## explicit; go 1.21
 github.com/tonistiigi/dchapes-mode
-# github.com/tonistiigi/fsutil v0.0.0-20250318190121-d73a4b3b8a7e
+# github.com/tonistiigi/fsutil v0.0.0-20250410151801-5b74a7ad7583
 ## explicit; go 1.21
 github.com/tonistiigi/fsutil
 github.com/tonistiigi/fsutil/copy