From 1060328a9606939962cbb4aaaff5add1c2b213d0 Mon Sep 17 00:00:00 2001
From: CrazyMax <1951866+crazy-max@users.noreply.github.com>
Date: Tue, 8 Oct 2024 13:38:13 +0200
Subject: [PATCH 1/2] build: fix build details link in experimental mode

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
---
 cmd/buildx/main.go                       | 11 +++++-
 controller/errdefs/build.go              | 18 ++++++++-
 controller/errdefs/errdefs.pb.go         | 23 ++++++++----
 controller/errdefs/errdefs.proto         |  1 +
 controller/errdefs/errdefs_vtproto.pb.go | 47 ++++++++++++++++++++++++
 controller/local/controller.go           |  8 +++-
 controller/remote/server.go              |  8 +++-
 tests/build.go                           |  5 ---
 util/desktop/desktop.go                  |  1 -
 9 files changed, 104 insertions(+), 18 deletions(-)

diff --git a/cmd/buildx/main.go b/cmd/buildx/main.go
index 62762f4cd77..98c654d7495 100644
--- a/cmd/buildx/main.go
+++ b/cmd/buildx/main.go
@@ -6,6 +6,7 @@ import (
 	"os"
 
 	"github.com/docker/buildx/commands"
+	controllererrors "github.com/docker/buildx/controller/errdefs"
 	"github.com/docker/buildx/util/desktop"
 	"github.com/docker/buildx/version"
 	"github.com/docker/cli/cli"
@@ -16,6 +17,7 @@ import (
 	cliflags "github.com/docker/cli/cli/flags"
 	"github.com/moby/buildkit/solver/errdefs"
 	"github.com/moby/buildkit/util/stack"
+	"github.com/pkg/errors"
 	"go.opentelemetry.io/otel"
 
 	//nolint:staticcheck // vendored dependencies may still use this
@@ -109,8 +111,15 @@ func main() {
 	} else {
 		fmt.Fprintf(cmd.Err(), "ERROR: %v\n", err)
 	}
-	if ebr, ok := err.(*desktop.ErrorWithBuildRef); ok {
+
+	var ebr *desktop.ErrorWithBuildRef
+	if errors.As(err, &ebr) {
 		ebr.Print(cmd.Err())
+	} else {
+		var be *controllererrors.BuildError
+		if errors.As(err, &be) {
+			be.PrintBuildDetails(cmd.Err())
+		}
 	}
 
 	os.Exit(1)
diff --git a/controller/errdefs/build.go b/controller/errdefs/build.go
index ffa5f6da8f0..471adbac517 100644
--- a/controller/errdefs/build.go
+++ b/controller/errdefs/build.go
@@ -1,7 +1,10 @@
 package errdefs
 
 import (
+	"io"
+
 	"github.com/containerd/typeurl/v2"
+	"github.com/docker/buildx/util/desktop"
 	"github.com/moby/buildkit/util/grpcerrors"
 )
 
@@ -22,11 +25,22 @@ func (e *BuildError) ToProto() grpcerrors.TypedErrorProto {
 	return e.Build
 }
 
-func WrapBuild(err error, ref string) error {
+func (e *BuildError) PrintBuildDetails(w io.Writer) error {
+	if e.BuildRef == "" {
+		return nil
+	}
+	ebr := &desktop.ErrorWithBuildRef{
+		Ref: e.BuildRef,
+		Err: e.error,
+	}
+	return ebr.Print(w)
+}
+
+func WrapBuild(err error, ref string, buildRef string) error {
 	if err == nil {
 		return nil
 	}
-	return &BuildError{Build: &Build{Ref: ref}, error: err}
+	return &BuildError{Build: &Build{Ref: ref, BuildRef: buildRef}, error: err}
 }
 
 func (b *Build) WrapError(err error) error {
diff --git a/controller/errdefs/errdefs.pb.go b/controller/errdefs/errdefs.pb.go
index ead4df646a7..40505a99fdb 100644
--- a/controller/errdefs/errdefs.pb.go
+++ b/controller/errdefs/errdefs.pb.go
@@ -25,7 +25,8 @@ type Build struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	Ref      string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	BuildRef string `protobuf:"bytes,2,opt,name=BuildRef,proto3" json:"BuildRef,omitempty"`
 }
 
 func (x *Build) Reset() {
@@ -67,6 +68,13 @@ func (x *Build) GetRef() string {
 	return ""
 }
 
+func (x *Build) GetBuildRef() string {
+	if x != nil {
+		return x.BuildRef
+	}
+	return ""
+}
+
 var File_github_com_docker_buildx_controller_errdefs_errdefs_proto protoreflect.FileDescriptor
 
 var file_github_com_docker_buildx_controller_errdefs_errdefs_proto_rawDesc = []byte{
@@ -75,12 +83,13 @@ var file_github_com_docker_buildx_controller_errdefs_errdefs_proto_rawDesc = []b
 	0x6f, 0x6c, 0x6c, 0x65, 0x72, 0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x2f, 0x65, 0x72,
 	0x72, 0x64, 0x65, 0x66, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x15, 0x64, 0x6f, 0x63,
 	0x6b, 0x65, 0x72, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x78, 0x2e, 0x65, 0x72, 0x72, 0x64, 0x65,
-	0x66, 0x73, 0x22, 0x19, 0x0a, 0x05, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x12, 0x10, 0x0a, 0x03, 0x52,
-	0x65, 0x66, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x52, 0x65, 0x66, 0x42, 0x2d, 0x5a,
-	0x2b, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x64, 0x6f, 0x63, 0x6b,
-	0x65, 0x72, 0x2f, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x78, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f,
-	0x6c, 0x6c, 0x65, 0x72, 0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x62, 0x06, 0x70, 0x72,
-	0x6f, 0x74, 0x6f, 0x33,
+	0x66, 0x73, 0x22, 0x35, 0x0a, 0x05, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x12, 0x10, 0x0a, 0x03, 0x52,
+	0x65, 0x66, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x52, 0x65, 0x66, 0x12, 0x1a, 0x0a,
+	0x08, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x52, 0x65, 0x66, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x08, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x52, 0x65, 0x66, 0x42, 0x2d, 0x5a, 0x2b, 0x67, 0x69, 0x74,
+	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x64, 0x6f, 0x63, 0x6b, 0x65, 0x72, 0x2f, 0x62,
+	0x75, 0x69, 0x6c, 0x64, 0x78, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x6c, 0x65, 0x72,
+	0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/controller/errdefs/errdefs.proto b/controller/errdefs/errdefs.proto
index f99b5953543..ded837e94a5 100644
--- a/controller/errdefs/errdefs.proto
+++ b/controller/errdefs/errdefs.proto
@@ -6,4 +6,5 @@ option go_package = "github.com/docker/buildx/controller/errdefs";
 
 message Build {
   string Ref = 1;
+  string BuildRef = 2;
 }
diff --git a/controller/errdefs/errdefs_vtproto.pb.go b/controller/errdefs/errdefs_vtproto.pb.go
index 0b256532fde..cab6582e0c2 100644
--- a/controller/errdefs/errdefs_vtproto.pb.go
+++ b/controller/errdefs/errdefs_vtproto.pb.go
@@ -25,6 +25,7 @@ func (m *Build) CloneVT() *Build {
 	}
 	r := new(Build)
 	r.Ref = m.Ref
+	r.BuildRef = m.BuildRef
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -45,6 +46,9 @@ func (this *Build) EqualVT(that *Build) bool {
 	if this.Ref != that.Ref {
 		return false
 	}
+	if this.BuildRef != that.BuildRef {
+		return false
+	}
 	return string(this.unknownFields) == string(that.unknownFields)
 }
 
@@ -85,6 +89,13 @@ func (m *Build) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if len(m.BuildRef) > 0 {
+		i -= len(m.BuildRef)
+		copy(dAtA[i:], m.BuildRef)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.BuildRef)))
+		i--
+		dAtA[i] = 0x12
+	}
 	if len(m.Ref) > 0 {
 		i -= len(m.Ref)
 		copy(dAtA[i:], m.Ref)
@@ -105,6 +116,10 @@ func (m *Build) SizeVT() (n int) {
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
+	l = len(m.BuildRef)
+	if l > 0 {
+		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
+	}
 	n += len(m.unknownFields)
 	return n
 }
@@ -170,6 +185,38 @@ func (m *Build) UnmarshalVT(dAtA []byte) error {
 			}
 			m.Ref = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field BuildRef", 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.BuildRef = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
diff --git a/controller/local/controller.go b/controller/local/controller.go
index 48e7e00da2c..68c5a809bac 100644
--- a/controller/local/controller.go
+++ b/controller/local/controller.go
@@ -11,6 +11,7 @@ import (
 	controllererrors "github.com/docker/buildx/controller/errdefs"
 	controllerapi "github.com/docker/buildx/controller/pb"
 	"github.com/docker/buildx/controller/processes"
+	"github.com/docker/buildx/util/desktop"
 	"github.com/docker/buildx/util/ioset"
 	"github.com/docker/buildx/util/progress"
 	"github.com/docker/cli/cli/command"
@@ -56,7 +57,12 @@ func (b *localController) Build(ctx context.Context, options *controllerapi.Buil
 			buildOptions: options,
 		}
 		if buildErr != nil {
-			buildErr = controllererrors.WrapBuild(buildErr, b.ref)
+			var buildRef string
+			var ebr *desktop.ErrorWithBuildRef
+			if errors.As(buildErr, &ebr) {
+				buildRef = ebr.Ref
+			}
+			buildErr = controllererrors.WrapBuild(buildErr, b.ref, buildRef)
 		}
 	}
 	if buildErr != nil {
diff --git a/controller/remote/server.go b/controller/remote/server.go
index b0b82bef138..f586571b58e 100644
--- a/controller/remote/server.go
+++ b/controller/remote/server.go
@@ -11,6 +11,7 @@ import (
 	controllererrors "github.com/docker/buildx/controller/errdefs"
 	"github.com/docker/buildx/controller/pb"
 	"github.com/docker/buildx/controller/processes"
+	"github.com/docker/buildx/util/desktop"
 	"github.com/docker/buildx/util/ioset"
 	"github.com/docker/buildx/util/progress"
 	"github.com/docker/buildx/version"
@@ -210,7 +211,12 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 			s.buildOptions = req.Options
 			m.session[ref] = s
 			if buildErr != nil {
-				buildErr = controllererrors.WrapBuild(buildErr, ref)
+				var buildRef string
+				var ebr *desktop.ErrorWithBuildRef
+				if errors.As(buildErr, &ebr) {
+					buildRef = ebr.Ref
+				}
+				buildErr = controllererrors.WrapBuild(buildErr, ref, buildRef)
 			}
 		}
 	} else {
diff --git a/tests/build.go b/tests/build.go
index beb8fbe48f5..046689dd182 100644
--- a/tests/build.go
+++ b/tests/build.go
@@ -493,11 +493,6 @@ RUN echo foo > /bar`)
 	require.NoError(t, err, string(out))
 	require.True(t, buildDetailsPattern.MatchString(string(out)), fmt.Sprintf("expected build details link in output, got %q", out))
 
-	if isExperimental() {
-		// FIXME: https://github.com/docker/buildx/issues/2382
-		t.Skip("build details link not displayed in experimental mode when build fails: https://github.com/docker/buildx/issues/2382")
-	}
-
 	// build erroneous dockerfile
 	dockerfile = []byte(`FROM busybox:latest
 RUN exit 1`)
diff --git a/util/desktop/desktop.go b/util/desktop/desktop.go
index 7fa4ee6d802..563b8f2fd3e 100644
--- a/util/desktop/desktop.go
+++ b/util/desktop/desktop.go
@@ -65,7 +65,6 @@ func hyperlink(url string) string {
 type ErrorWithBuildRef struct {
 	Ref string
 	Err error
-	Msg string
 }
 
 func (e *ErrorWithBuildRef) Error() string {

From eb15c667b9e24f7c722b8ccb068854aa6e08d47b Mon Sep 17 00:00:00 2001
From: CrazyMax <1951866+crazy-max@users.noreply.github.com>
Date: Thu, 24 Oct 2024 15:37:18 +0200
Subject: [PATCH 2/2] controller: rename ref to sessionID and set buildRef back
 to ref

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
---
 controller/errdefs/build.go              |   8 +-
 controller/errdefs/errdefs.pb.go         |  27 +-
 controller/errdefs/errdefs.proto         |   4 +-
 controller/errdefs/errdefs_vtproto.pb.go |  32 +-
 controller/local/controller.go           |  38 +-
 controller/pb/controller.pb.go           | 658 ++++++++++++-----------
 controller/pb/controller.proto           |  18 +-
 controller/pb/controller_vtproto.pb.go   | 162 +++---
 controller/remote/client.go              |  36 +-
 controller/remote/io.go                  |   6 +-
 controller/remote/server.go              |  78 +--
 11 files changed, 537 insertions(+), 530 deletions(-)

diff --git a/controller/errdefs/build.go b/controller/errdefs/build.go
index 471adbac517..d289d5746b6 100644
--- a/controller/errdefs/build.go
+++ b/controller/errdefs/build.go
@@ -26,21 +26,21 @@ func (e *BuildError) ToProto() grpcerrors.TypedErrorProto {
 }
 
 func (e *BuildError) PrintBuildDetails(w io.Writer) error {
-	if e.BuildRef == "" {
+	if e.Ref == "" {
 		return nil
 	}
 	ebr := &desktop.ErrorWithBuildRef{
-		Ref: e.BuildRef,
+		Ref: e.Ref,
 		Err: e.error,
 	}
 	return ebr.Print(w)
 }
 
-func WrapBuild(err error, ref string, buildRef string) error {
+func WrapBuild(err error, sessionID string, ref string) error {
 	if err == nil {
 		return nil
 	}
-	return &BuildError{Build: &Build{Ref: ref, BuildRef: buildRef}, error: err}
+	return &BuildError{Build: &Build{SessionID: sessionID, Ref: ref}, error: err}
 }
 
 func (b *Build) WrapError(err error) error {
diff --git a/controller/errdefs/errdefs.pb.go b/controller/errdefs/errdefs.pb.go
index 40505a99fdb..e6daad7064e 100644
--- a/controller/errdefs/errdefs.pb.go
+++ b/controller/errdefs/errdefs.pb.go
@@ -25,8 +25,8 @@ type Build struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref      string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
-	BuildRef string `protobuf:"bytes,2,opt,name=BuildRef,proto3" json:"BuildRef,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
+	Ref       string `protobuf:"bytes,2,opt,name=Ref,proto3" json:"Ref,omitempty"`
 }
 
 func (x *Build) Reset() {
@@ -61,16 +61,16 @@ func (*Build) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_errdefs_errdefs_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *Build) GetRef() string {
+func (x *Build) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
 
-func (x *Build) GetBuildRef() string {
+func (x *Build) GetRef() string {
 	if x != nil {
-		return x.BuildRef
+		return x.Ref
 	}
 	return ""
 }
@@ -83,13 +83,14 @@ var file_github_com_docker_buildx_controller_errdefs_errdefs_proto_rawDesc = []b
 	0x6f, 0x6c, 0x6c, 0x65, 0x72, 0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x2f, 0x65, 0x72,
 	0x72, 0x64, 0x65, 0x66, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x15, 0x64, 0x6f, 0x63,
 	0x6b, 0x65, 0x72, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x78, 0x2e, 0x65, 0x72, 0x72, 0x64, 0x65,
-	0x66, 0x73, 0x22, 0x35, 0x0a, 0x05, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x12, 0x10, 0x0a, 0x03, 0x52,
-	0x65, 0x66, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x52, 0x65, 0x66, 0x12, 0x1a, 0x0a,
-	0x08, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x52, 0x65, 0x66, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52,
-	0x08, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x52, 0x65, 0x66, 0x42, 0x2d, 0x5a, 0x2b, 0x67, 0x69, 0x74,
-	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x64, 0x6f, 0x63, 0x6b, 0x65, 0x72, 0x2f, 0x62,
-	0x75, 0x69, 0x6c, 0x64, 0x78, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x6c, 0x65, 0x72,
-	0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x66, 0x73, 0x22, 0x37, 0x0a, 0x05, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x12, 0x1c, 0x0a, 0x09, 0x53,
+	0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x49, 0x44, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x09,
+	0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x49, 0x44, 0x12, 0x10, 0x0a, 0x03, 0x52, 0x65, 0x66,
+	0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x52, 0x65, 0x66, 0x42, 0x2d, 0x5a, 0x2b, 0x67,
+	0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x64, 0x6f, 0x63, 0x6b, 0x65, 0x72,
+	0x2f, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x78, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x6c,
+	0x65, 0x72, 0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
diff --git a/controller/errdefs/errdefs.proto b/controller/errdefs/errdefs.proto
index ded837e94a5..a1b903f8dfa 100644
--- a/controller/errdefs/errdefs.proto
+++ b/controller/errdefs/errdefs.proto
@@ -5,6 +5,6 @@ package docker.buildx.errdefs;
 option go_package = "github.com/docker/buildx/controller/errdefs";
 
 message Build {
-  string Ref = 1;
-  string BuildRef = 2;
+  string SessionID = 1;
+  string Ref = 2;
 }
diff --git a/controller/errdefs/errdefs_vtproto.pb.go b/controller/errdefs/errdefs_vtproto.pb.go
index cab6582e0c2..c6fe19b52a5 100644
--- a/controller/errdefs/errdefs_vtproto.pb.go
+++ b/controller/errdefs/errdefs_vtproto.pb.go
@@ -24,8 +24,8 @@ func (m *Build) CloneVT() *Build {
 		return (*Build)(nil)
 	}
 	r := new(Build)
+	r.SessionID = m.SessionID
 	r.Ref = m.Ref
-	r.BuildRef = m.BuildRef
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -43,10 +43,10 @@ func (this *Build) EqualVT(that *Build) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
-	if this.BuildRef != that.BuildRef {
+	if this.Ref != that.Ref {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -89,18 +89,18 @@ func (m *Build) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.BuildRef) > 0 {
-		i -= len(m.BuildRef)
-		copy(dAtA[i:], m.BuildRef)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.BuildRef)))
-		i--
-		dAtA[i] = 0x12
-	}
 	if len(m.Ref) > 0 {
 		i -= len(m.Ref)
 		copy(dAtA[i:], m.Ref)
 		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
 		i--
+		dAtA[i] = 0x12
+	}
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
+		i--
 		dAtA[i] = 0xa
 	}
 	return len(dAtA) - i, nil
@@ -112,11 +112,11 @@ func (m *Build) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
-	l = len(m.BuildRef)
+	l = len(m.Ref)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -155,7 +155,7 @@ func (m *Build) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -183,11 +183,11 @@ func (m *Build) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field BuildRef", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -215,7 +215,7 @@ func (m *Build) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.BuildRef = string(dAtA[iNdEx:postIndex])
+			m.Ref = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
diff --git a/controller/local/controller.go b/controller/local/controller.go
index 68c5a809bac..9d58b31f386 100644
--- a/controller/local/controller.go
+++ b/controller/local/controller.go
@@ -22,7 +22,7 @@ import (
 func NewLocalBuildxController(ctx context.Context, dockerCli command.Cli, logger progress.SubLogger) control.BuildxController {
 	return &localController{
 		dockerCli: dockerCli,
-		ref:       "local",
+		sessionID: "local",
 		processes: processes.NewManager(),
 	}
 }
@@ -36,7 +36,7 @@ type buildConfig struct {
 
 type localController struct {
 	dockerCli   command.Cli
-	ref         string
+	sessionID   string
 	buildConfig buildConfig
 	processes   *processes.Manager
 
@@ -57,30 +57,30 @@ func (b *localController) Build(ctx context.Context, options *controllerapi.Buil
 			buildOptions: options,
 		}
 		if buildErr != nil {
-			var buildRef string
+			var ref string
 			var ebr *desktop.ErrorWithBuildRef
 			if errors.As(buildErr, &ebr) {
-				buildRef = ebr.Ref
+				ref = ebr.Ref
 			}
-			buildErr = controllererrors.WrapBuild(buildErr, b.ref, buildRef)
+			buildErr = controllererrors.WrapBuild(buildErr, b.sessionID, ref)
 		}
 	}
 	if buildErr != nil {
 		return "", nil, nil, buildErr
 	}
-	return b.ref, resp, dockerfileMappings, nil
+	return b.sessionID, resp, dockerfileMappings, nil
 }
 
-func (b *localController) ListProcesses(ctx context.Context, ref string) (infos []*controllerapi.ProcessInfo, retErr error) {
-	if ref != b.ref {
-		return nil, errors.Errorf("unknown ref %q", ref)
+func (b *localController) ListProcesses(ctx context.Context, sessionID string) (infos []*controllerapi.ProcessInfo, retErr error) {
+	if sessionID != b.sessionID {
+		return nil, errors.Errorf("unknown session ID %q", sessionID)
 	}
 	return b.processes.ListProcesses(), nil
 }
 
-func (b *localController) DisconnectProcess(ctx context.Context, ref, pid string) error {
-	if ref != b.ref {
-		return errors.Errorf("unknown ref %q", ref)
+func (b *localController) DisconnectProcess(ctx context.Context, sessionID, pid string) error {
+	if sessionID != b.sessionID {
+		return errors.Errorf("unknown session ID %q", sessionID)
 	}
 	return b.processes.DeleteProcess(pid)
 }
@@ -89,9 +89,9 @@ func (b *localController) cancelRunningProcesses() {
 	b.processes.CancelRunningProcesses()
 }
 
-func (b *localController) Invoke(ctx context.Context, ref string, pid string, cfg *controllerapi.InvokeConfig, ioIn io.ReadCloser, ioOut io.WriteCloser, ioErr io.WriteCloser) error {
-	if ref != b.ref {
-		return errors.Errorf("unknown ref %q", ref)
+func (b *localController) Invoke(ctx context.Context, sessionID string, pid string, cfg *controllerapi.InvokeConfig, ioIn io.ReadCloser, ioOut io.WriteCloser, ioErr io.WriteCloser) error {
+	if sessionID != b.sessionID {
+		return errors.Errorf("unknown session ID %q", sessionID)
 	}
 
 	proc, ok := b.processes.Get(pid)
@@ -136,7 +136,7 @@ func (b *localController) Close() error {
 }
 
 func (b *localController) List(ctx context.Context) (res []string, _ error) {
-	return []string{b.ref}, nil
+	return []string{b.sessionID}, nil
 }
 
 func (b *localController) Disconnect(ctx context.Context, key string) error {
@@ -144,9 +144,9 @@ func (b *localController) Disconnect(ctx context.Context, key string) error {
 	return nil
 }
 
-func (b *localController) Inspect(ctx context.Context, ref string) (*controllerapi.InspectResponse, error) {
-	if ref != b.ref {
-		return nil, errors.Errorf("unknown ref %q", ref)
+func (b *localController) Inspect(ctx context.Context, sessionID string) (*controllerapi.InspectResponse, error) {
+	if sessionID != b.sessionID {
+		return nil, errors.Errorf("unknown session ID %q", sessionID)
 	}
 	return &controllerapi.InspectResponse{Options: b.buildConfig.buildOptions}, nil
 }
diff --git a/controller/pb/controller.pb.go b/controller/pb/controller.pb.go
index 4526fc22907..95913c07ef7 100644
--- a/controller/pb/controller.pb.go
+++ b/controller/pb/controller.pb.go
@@ -27,7 +27,7 @@ type ListProcessesRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *ListProcessesRequest) Reset() {
@@ -62,9 +62,9 @@ func (*ListProcessesRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *ListProcessesRequest) GetRef() string {
+func (x *ListProcessesRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -176,7 +176,7 @@ type DisconnectProcessRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref       string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 	ProcessID string `protobuf:"bytes,2,opt,name=ProcessID,proto3" json:"ProcessID,omitempty"`
 }
 
@@ -212,9 +212,9 @@ func (*DisconnectProcessRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{3}
 }
 
-func (x *DisconnectProcessRequest) GetRef() string {
+func (x *DisconnectProcessRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -269,8 +269,8 @@ type BuildRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref     string        `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
-	Options *BuildOptions `protobuf:"bytes,2,opt,name=Options,proto3" json:"Options,omitempty"`
+	SessionID string        `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
+	Options   *BuildOptions `protobuf:"bytes,2,opt,name=Options,proto3" json:"Options,omitempty"`
 }
 
 func (x *BuildRequest) Reset() {
@@ -305,9 +305,9 @@ func (*BuildRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{5}
 }
 
-func (x *BuildRequest) GetRef() string {
+func (x *BuildRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -981,7 +981,7 @@ type InspectRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *InspectRequest) Reset() {
@@ -1016,9 +1016,9 @@ func (*InspectRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{13}
 }
 
-func (x *InspectRequest) GetRef() string {
+func (x *InspectRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -1232,7 +1232,7 @@ type DisconnectRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *DisconnectRequest) Reset() {
@@ -1267,9 +1267,9 @@ func (*DisconnectRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{18}
 }
 
-func (x *DisconnectRequest) GetRef() string {
+func (x *DisconnectRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -1317,7 +1317,7 @@ type ListRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *ListRequest) Reset() {
@@ -1352,9 +1352,9 @@ func (*ListRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{20}
 }
 
-func (x *ListRequest) GetRef() string {
+func (x *ListRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -1492,7 +1492,7 @@ type InputInitMessage struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *InputInitMessage) Reset() {
@@ -1527,9 +1527,9 @@ func (*InputInitMessage) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{23}
 }
 
-func (x *InputInitMessage) GetRef() string {
+func (x *InputInitMessage) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -1745,7 +1745,7 @@ type InitMessage struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 	// If ProcessID already exists in the server, it tries to connect to it
 	// instead of invoking the new one. In this case, InvokeConfig will be ignored.
 	ProcessID    string        `protobuf:"bytes,2,opt,name=ProcessID,proto3" json:"ProcessID,omitempty"`
@@ -1784,9 +1784,9 @@ func (*InitMessage) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{27}
 }
 
-func (x *InitMessage) GetRef() string {
+func (x *InitMessage) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -2104,7 +2104,7 @@ type StatusRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *StatusRequest) Reset() {
@@ -2139,9 +2139,9 @@ func (*StatusRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{32}
 }
 
-func (x *StatusRequest) GetRef() string {
+func (x *StatusRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -2380,178 +2380,181 @@ var file_github_com_docker_buildx_controller_pb_controller_proto_rawDesc = []byt
 	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6d, 0x6f, 0x62, 0x79, 0x2f, 0x62, 0x75,
 	0x69, 0x6c, 0x64, 0x6b, 0x69, 0x74, 0x2f, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x70, 0x6f, 0x6c,
 	0x69, 0x63, 0x79, 0x2f, 0x70, 0x62, 0x2f, 0x70, 0x6f, 0x6c, 0x69, 0x63, 0x79, 0x2e, 0x70, 0x72,
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+	0x65, 0x72, 0x2f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/controller/pb/controller.proto b/controller/pb/controller.proto
index 18044d3d359..71281c1b15c 100644
--- a/controller/pb/controller.proto
+++ b/controller/pb/controller.proto
@@ -21,7 +21,7 @@ service Controller {
 }
 
 message ListProcessesRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message ListProcessesResponse {
@@ -34,7 +34,7 @@ message ProcessInfo {
 }
 
 message DisconnectProcessRequest {
-  string Ref = 1;
+  string SessionID = 1;
   string ProcessID = 2;
 }
 
@@ -42,7 +42,7 @@ message DisconnectProcessResponse {
 }
 
 message BuildRequest {
-  string Ref = 1;
+  string SessionID = 1;
   BuildOptions Options = 2;
 }
 
@@ -118,7 +118,7 @@ message CallFunc {
 }
 
 message InspectRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message InspectResponse {
@@ -140,13 +140,13 @@ message BuildResponse {
 }
 
 message DisconnectRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message DisconnectResponse {}
 
 message ListRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message ListResponse {
@@ -161,7 +161,7 @@ message InputMessage {
 }
 
 message InputInitMessage {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message DataMessage {
@@ -186,7 +186,7 @@ message Message {
 }
 
 message InitMessage {
-  string Ref = 1;
+  string SessionID = 1;
 
   // If ProcessID already exists in the server, it tries to connect to it
   // instead of invoking the new one. In this case, InvokeConfig will be ignored.
@@ -227,7 +227,7 @@ message SignalMessage {
 }
 
 message StatusRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message StatusResponse {
diff --git a/controller/pb/controller_vtproto.pb.go b/controller/pb/controller_vtproto.pb.go
index 572672a04c0..5785602eea6 100644
--- a/controller/pb/controller_vtproto.pb.go
+++ b/controller/pb/controller_vtproto.pb.go
@@ -26,7 +26,7 @@ func (m *ListProcessesRequest) CloneVT() *ListProcessesRequest {
 		return (*ListProcessesRequest)(nil)
 	}
 	r := new(ListProcessesRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -84,7 +84,7 @@ func (m *DisconnectProcessRequest) CloneVT() *DisconnectProcessRequest {
 		return (*DisconnectProcessRequest)(nil)
 	}
 	r := new(DisconnectProcessRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	r.ProcessID = m.ProcessID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
@@ -118,7 +118,7 @@ func (m *BuildRequest) CloneVT() *BuildRequest {
 		return (*BuildRequest)(nil)
 	}
 	r := new(BuildRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	r.Options = m.Options.CloneVT()
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
@@ -396,7 +396,7 @@ func (m *InspectRequest) CloneVT() *InspectRequest {
 		return (*InspectRequest)(nil)
 	}
 	r := new(InspectRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -495,7 +495,7 @@ func (m *DisconnectRequest) CloneVT() *DisconnectRequest {
 		return (*DisconnectRequest)(nil)
 	}
 	r := new(DisconnectRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -528,7 +528,7 @@ func (m *ListRequest) CloneVT() *ListRequest {
 		return (*ListRequest)(nil)
 	}
 	r := new(ListRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -603,7 +603,7 @@ func (m *InputInitMessage) CloneVT() *InputInitMessage {
 		return (*InputInitMessage)(nil)
 	}
 	r := new(InputInitMessage)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -713,7 +713,7 @@ func (m *InitMessage) CloneVT() *InitMessage {
 		return (*InitMessage)(nil)
 	}
 	r := new(InitMessage)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	r.ProcessID = m.ProcessID
 	r.InvokeConfig = m.InvokeConfig.CloneVT()
 	if len(m.unknownFields) > 0 {
@@ -829,7 +829,7 @@ func (m *StatusRequest) CloneVT() *StatusRequest {
 		return (*StatusRequest)(nil)
 	}
 	r := new(StatusRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -959,7 +959,7 @@ func (this *ListProcessesRequest) EqualVT(that *ListProcessesRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1033,7 +1033,7 @@ func (this *DisconnectProcessRequest) EqualVT(that *DisconnectProcessRequest) bo
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	if this.ProcessID != that.ProcessID {
@@ -1071,7 +1071,7 @@ func (this *BuildRequest) EqualVT(that *BuildRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	if !this.Options.EqualVT(that.Options) {
@@ -1524,7 +1524,7 @@ func (this *InspectRequest) EqualVT(that *InspectRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1651,7 +1651,7 @@ func (this *DisconnectRequest) EqualVT(that *DisconnectRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1686,7 +1686,7 @@ func (this *ListRequest) EqualVT(that *ListRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1808,7 +1808,7 @@ func (this *InputInitMessage) EqualVT(that *InputInitMessage) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1991,7 +1991,7 @@ func (this *InitMessage) EqualVT(that *InitMessage) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	if this.ProcessID != that.ProcessID {
@@ -2149,7 +2149,7 @@ func (this *StatusRequest) EqualVT(that *StatusRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -2356,10 +2356,10 @@ func (m *ListProcessesRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error)
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -2498,10 +2498,10 @@ func (m *DisconnectProcessRequest) MarshalToSizedBufferVT(dAtA []byte) (int, err
 		i--
 		dAtA[i] = 0x12
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -2581,10 +2581,10 @@ func (m *BuildRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0x12
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -3363,10 +3363,10 @@ func (m *InspectRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -3603,10 +3603,10 @@ func (m *DisconnectRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -3676,10 +3676,10 @@ func (m *ListRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -3846,10 +3846,10 @@ func (m *InputInitMessage) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -4120,10 +4120,10 @@ func (m *InitMessage) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0x12
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -4432,10 +4432,10 @@ func (m *StatusRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -4707,7 +4707,7 @@ func (m *ListProcessesRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -4755,7 +4755,7 @@ func (m *DisconnectProcessRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -4783,7 +4783,7 @@ func (m *BuildRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5108,7 +5108,7 @@ func (m *InspectRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5197,7 +5197,7 @@ func (m *DisconnectRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5221,7 +5221,7 @@ func (m *ListRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5292,7 +5292,7 @@ func (m *InputInitMessage) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5402,7 +5402,7 @@ func (m *InitMessage) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5528,7 +5528,7 @@ func (m *StatusRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5671,7 +5671,7 @@ func (m *ListProcessesRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -5699,7 +5699,7 @@ func (m *ListProcessesRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -5958,7 +5958,7 @@ func (m *DisconnectProcessRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -5986,7 +5986,7 @@ func (m *DisconnectProcessRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
@@ -6124,7 +6124,7 @@ func (m *BuildRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -6152,7 +6152,7 @@ func (m *BuildRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
@@ -8558,7 +8558,7 @@ func (m *InspectRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -8586,7 +8586,7 @@ func (m *InspectRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -9207,7 +9207,7 @@ func (m *DisconnectRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -9235,7 +9235,7 @@ func (m *DisconnectRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -9341,7 +9341,7 @@ func (m *ListRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -9369,7 +9369,7 @@ func (m *ListRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -9640,7 +9640,7 @@ func (m *InputInitMessage) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -9668,7 +9668,7 @@ func (m *InputInitMessage) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -10094,7 +10094,7 @@ func (m *InitMessage) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -10122,7 +10122,7 @@ func (m *InitMessage) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
@@ -10872,7 +10872,7 @@ func (m *StatusRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -10900,7 +10900,7 @@ func (m *StatusRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
diff --git a/controller/remote/client.go b/controller/remote/client.go
index f28005c0412..dd6b5b65f6a 100644
--- a/controller/remote/client.go
+++ b/controller/remote/client.go
@@ -75,36 +75,36 @@ func (c *Client) List(ctx context.Context) (keys []string, retErr error) {
 	return res.Keys, nil
 }
 
-func (c *Client) Disconnect(ctx context.Context, key string) error {
-	if key == "" {
+func (c *Client) Disconnect(ctx context.Context, sessionID string) error {
+	if sessionID == "" {
 		return nil
 	}
-	_, err := c.client().Disconnect(ctx, &pb.DisconnectRequest{Ref: key})
+	_, err := c.client().Disconnect(ctx, &pb.DisconnectRequest{SessionID: sessionID})
 	return err
 }
 
-func (c *Client) ListProcesses(ctx context.Context, ref string) (infos []*pb.ProcessInfo, retErr error) {
-	res, err := c.client().ListProcesses(ctx, &pb.ListProcessesRequest{Ref: ref})
+func (c *Client) ListProcesses(ctx context.Context, sessionID string) (infos []*pb.ProcessInfo, retErr error) {
+	res, err := c.client().ListProcesses(ctx, &pb.ListProcessesRequest{SessionID: sessionID})
 	if err != nil {
 		return nil, err
 	}
 	return res.Infos, nil
 }
 
-func (c *Client) DisconnectProcess(ctx context.Context, ref, pid string) error {
-	_, err := c.client().DisconnectProcess(ctx, &pb.DisconnectProcessRequest{Ref: ref, ProcessID: pid})
+func (c *Client) DisconnectProcess(ctx context.Context, sessionID, pid string) error {
+	_, err := c.client().DisconnectProcess(ctx, &pb.DisconnectProcessRequest{SessionID: sessionID, ProcessID: pid})
 	return err
 }
 
-func (c *Client) Invoke(ctx context.Context, ref string, pid string, invokeConfig *pb.InvokeConfig, in io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) error {
-	if ref == "" || pid == "" {
-		return errors.New("build reference must be specified")
+func (c *Client) Invoke(ctx context.Context, sessionID string, pid string, invokeConfig *pb.InvokeConfig, in io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) error {
+	if sessionID == "" || pid == "" {
+		return errors.New("build session ID must be specified")
 	}
 	stream, err := c.client().Invoke(ctx)
 	if err != nil {
 		return err
 	}
-	return attachIO(ctx, stream, &pb.InitMessage{Ref: ref, ProcessID: pid, InvokeConfig: invokeConfig}, ioAttachConfig{
+	return attachIO(ctx, stream, &pb.InitMessage{SessionID: sessionID, ProcessID: pid, InvokeConfig: invokeConfig}, ioAttachConfig{
 		stdin:  in,
 		stdout: stdout,
 		stderr: stderr,
@@ -112,8 +112,8 @@ func (c *Client) Invoke(ctx context.Context, ref string, pid string, invokeConfi
 	})
 }
 
-func (c *Client) Inspect(ctx context.Context, ref string) (*pb.InspectResponse, error) {
-	return c.client().Inspect(ctx, &pb.InspectRequest{Ref: ref})
+func (c *Client) Inspect(ctx context.Context, sessionID string) (*pb.InspectResponse, error) {
+	return c.client().Inspect(ctx, &pb.InspectRequest{SessionID: sessionID})
 }
 
 func (c *Client) Build(ctx context.Context, options *pb.BuildOptions, in io.ReadCloser, progress progress.Writer) (string, *client.SolveResponse, *build.Inputs, error) {
@@ -137,7 +137,7 @@ func (c *Client) Build(ctx context.Context, options *pb.BuildOptions, in io.Read
 	return ref, resp, nil, eg.Wait()
 }
 
-func (c *Client) build(ctx context.Context, ref string, options *pb.BuildOptions, in io.ReadCloser, statusChan chan *client.SolveStatus) (*client.SolveResponse, error) {
+func (c *Client) build(ctx context.Context, sessionID string, options *pb.BuildOptions, in io.ReadCloser, statusChan chan *client.SolveStatus) (*client.SolveResponse, error) {
 	eg, egCtx := errgroup.WithContext(ctx)
 	done := make(chan struct{})
 
@@ -146,8 +146,8 @@ func (c *Client) build(ctx context.Context, ref string, options *pb.BuildOptions
 	eg.Go(func() error {
 		defer close(done)
 		pbResp, err := c.client().Build(egCtx, &pb.BuildRequest{
-			Ref:     ref,
-			Options: options,
+			SessionID: sessionID,
+			Options:   options,
 		})
 		if err != nil {
 			return err
@@ -159,7 +159,7 @@ func (c *Client) build(ctx context.Context, ref string, options *pb.BuildOptions
 	})
 	eg.Go(func() error {
 		stream, err := c.client().Status(egCtx, &pb.StatusRequest{
-			Ref: ref,
+			SessionID: sessionID,
 		})
 		if err != nil {
 			return err
@@ -184,7 +184,7 @@ func (c *Client) build(ctx context.Context, ref string, options *pb.BuildOptions
 			if err := stream.Send(&pb.InputMessage{
 				Input: &pb.InputMessage_Init{
 					Init: &pb.InputInitMessage{
-						Ref: ref,
+						SessionID: sessionID,
 					},
 				},
 			}); err != nil {
diff --git a/controller/remote/io.go b/controller/remote/io.go
index 6b8f7646687..df28b4457e5 100644
--- a/controller/remote/io.go
+++ b/controller/remote/io.go
@@ -43,9 +43,9 @@ func serveIO(attachCtx context.Context, srv msgStream, initFn func(*pb.InitMessa
 	if init == nil {
 		return errors.Errorf("unexpected message: %T; wanted init", msg.GetInput())
 	}
-	ref := init.Ref
-	if ref == "" {
-		return errors.New("no ref is provided")
+	sessionID := init.SessionID
+	if sessionID == "" {
+		return errors.New("no session ID is provided")
 	}
 	if err := initFn(init); err != nil {
 		return errors.Wrap(err, "failed to initialize IO server")
diff --git a/controller/remote/server.go b/controller/remote/server.go
index f586571b58e..a53486ade8e 100644
--- a/controller/remote/server.go
+++ b/controller/remote/server.go
@@ -53,9 +53,9 @@ func (s *session) cancelRunningProcesses() {
 func (m *Server) ListProcesses(ctx context.Context, req *pb.ListProcessesRequest) (res *pb.ListProcessesResponse, err error) {
 	m.sessionMu.Lock()
 	defer m.sessionMu.Unlock()
-	s, ok := m.session[req.Ref]
+	s, ok := m.session[req.SessionID]
 	if !ok {
-		return nil, errors.Errorf("unknown ref %q", req.Ref)
+		return nil, errors.Errorf("unknown session ID %q", req.SessionID)
 	}
 	res = new(pb.ListProcessesResponse)
 	res.Infos = append(res.Infos, s.processes.ListProcesses()...)
@@ -65,9 +65,9 @@ func (m *Server) ListProcesses(ctx context.Context, req *pb.ListProcessesRequest
 func (m *Server) DisconnectProcess(ctx context.Context, req *pb.DisconnectProcessRequest) (res *pb.DisconnectProcessResponse, err error) {
 	m.sessionMu.Lock()
 	defer m.sessionMu.Unlock()
-	s, ok := m.session[req.Ref]
+	s, ok := m.session[req.SessionID]
 	if !ok {
-		return nil, errors.Errorf("unknown ref %q", req.Ref)
+		return nil, errors.Errorf("unknown session ID %q", req.SessionID)
 	}
 	return res, s.processes.DeleteProcess(req.ProcessID)
 }
@@ -101,13 +101,13 @@ func (m *Server) List(ctx context.Context, req *pb.ListRequest) (res *pb.ListRes
 }
 
 func (m *Server) Disconnect(ctx context.Context, req *pb.DisconnectRequest) (res *pb.DisconnectResponse, err error) {
-	key := req.Ref
-	if key == "" {
-		return nil, errors.New("disconnect: empty key")
+	sessionID := req.SessionID
+	if sessionID == "" {
+		return nil, errors.New("disconnect: empty session ID")
 	}
 
 	m.sessionMu.Lock()
-	if s, ok := m.session[key]; ok {
+	if s, ok := m.session[sessionID]; ok {
 		if s.cancelBuild != nil {
 			s.cancelBuild()
 		}
@@ -116,7 +116,7 @@ func (m *Server) Disconnect(ctx context.Context, req *pb.DisconnectRequest) (res
 			s.result.Done()
 		}
 	}
-	delete(m.session, key)
+	delete(m.session, sessionID)
 	m.sessionMu.Unlock()
 
 	return &pb.DisconnectResponse{}, nil
@@ -137,26 +137,26 @@ func (m *Server) Close() error {
 }
 
 func (m *Server) Inspect(ctx context.Context, req *pb.InspectRequest) (*pb.InspectResponse, error) {
-	ref := req.Ref
-	if ref == "" {
-		return nil, errors.New("inspect: empty key")
+	sessionID := req.SessionID
+	if sessionID == "" {
+		return nil, errors.New("inspect: empty session ID")
 	}
 	var bo *pb.BuildOptions
 	m.sessionMu.Lock()
-	if s, ok := m.session[ref]; ok {
+	if s, ok := m.session[sessionID]; ok {
 		bo = s.buildOptions
 	} else {
 		m.sessionMu.Unlock()
-		return nil, errors.Errorf("inspect: unknown key %v", ref)
+		return nil, errors.Errorf("inspect: unknown key %v", sessionID)
 	}
 	m.sessionMu.Unlock()
 	return &pb.InspectResponse{Options: bo}, nil
 }
 
 func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResponse, error) {
-	ref := req.Ref
-	if ref == "" {
-		return nil, errors.New("build: empty key")
+	sessionID := req.SessionID
+	if sessionID == "" {
+		return nil, errors.New("build: empty session ID")
 	}
 
 	// Prepare status channel and session
@@ -164,7 +164,7 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 	if m.session == nil {
 		m.session = make(map[string]*session)
 	}
-	s, ok := m.session[ref]
+	s, ok := m.session[sessionID]
 	if ok {
 		if !s.buildOnGoing.CompareAndSwap(false, true) {
 			m.sessionMu.Unlock()
@@ -183,12 +183,12 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 	inR, inW := io.Pipe()
 	defer inR.Close()
 	s.inputPipe = inW
-	m.session[ref] = s
+	m.session[sessionID] = s
 	m.sessionMu.Unlock()
 	defer func() {
 		close(statusChan)
 		m.sessionMu.Lock()
-		s, ok := m.session[ref]
+		s, ok := m.session[sessionID]
 		if ok {
 			s.statusChan = nil
 			s.buildOnGoing.Store(false)
@@ -203,25 +203,25 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 	defer cancel()
 	resp, res, _, buildErr := m.buildFunc(ctx, req.Options, inR, pw)
 	m.sessionMu.Lock()
-	if s, ok := m.session[ref]; ok {
+	if s, ok := m.session[sessionID]; ok {
 		// NOTE: buildFunc can return *build.ResultHandle even on error (e.g. when it's implemented using (github.com/docker/buildx/controller/build).RunBuild).
 		if res != nil {
 			s.result = res
 			s.cancelBuild = cancel
 			s.buildOptions = req.Options
-			m.session[ref] = s
+			m.session[sessionID] = s
 			if buildErr != nil {
-				var buildRef string
+				var ref string
 				var ebr *desktop.ErrorWithBuildRef
 				if errors.As(buildErr, &ebr) {
-					buildRef = ebr.Ref
+					ref = ebr.Ref
 				}
-				buildErr = controllererrors.WrapBuild(buildErr, ref, buildRef)
+				buildErr = controllererrors.WrapBuild(buildErr, sessionID, ref)
 			}
 		}
 	} else {
 		m.sessionMu.Unlock()
-		return nil, errors.Errorf("build: unknown key %v", ref)
+		return nil, errors.Errorf("build: unknown session ID %v", sessionID)
 	}
 	m.sessionMu.Unlock()
 
@@ -238,9 +238,9 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 }
 
 func (m *Server) Status(req *pb.StatusRequest, stream pb.Controller_StatusServer) error {
-	ref := req.Ref
-	if ref == "" {
-		return errors.New("status: empty key")
+	sessionID := req.SessionID
+	if sessionID == "" {
+		return errors.New("status: empty session ID")
 	}
 
 	// Wait and get status channel prepared by Build()
@@ -248,12 +248,12 @@ func (m *Server) Status(req *pb.StatusRequest, stream pb.Controller_StatusServer
 	for {
 		// TODO: timeout?
 		m.sessionMu.Lock()
-		if _, ok := m.session[ref]; !ok || m.session[ref].statusChan == nil {
+		if _, ok := m.session[sessionID]; !ok || m.session[sessionID].statusChan == nil {
 			m.sessionMu.Unlock()
 			time.Sleep(time.Millisecond) // TODO: wait Build without busy loop and make it cancellable
 			continue
 		}
-		statusChan = m.session[ref].statusChan
+		statusChan = m.session[sessionID].statusChan
 		m.sessionMu.Unlock()
 		break
 	}
@@ -284,9 +284,9 @@ func (m *Server) Input(stream pb.Controller_InputServer) (err error) {
 	if init == nil {
 		return errors.Errorf("unexpected message: %T; wanted init", msg.GetInit())
 	}
-	ref := init.Ref
-	if ref == "" {
-		return errors.New("input: no ref is provided")
+	sessionID := init.SessionID
+	if sessionID == "" {
+		return errors.New("input: no session ID is provided")
 	}
 
 	// Wait and get input stream pipe prepared by Build()
@@ -294,12 +294,12 @@ func (m *Server) Input(stream pb.Controller_InputServer) (err error) {
 	for {
 		// TODO: timeout?
 		m.sessionMu.Lock()
-		if _, ok := m.session[ref]; !ok || m.session[ref].inputPipe == nil {
+		if _, ok := m.session[sessionID]; !ok || m.session[sessionID].inputPipe == nil {
 			m.sessionMu.Unlock()
 			time.Sleep(time.Millisecond) // TODO: wait Build without busy loop and make it cancellable
 			continue
 		}
-		inputPipeW = m.session[ref].inputPipe
+		inputPipeW = m.session[sessionID].inputPipe
 		m.sessionMu.Unlock()
 		break
 	}
@@ -379,14 +379,14 @@ func (m *Server) Invoke(srv pb.Controller_InvokeServer) error {
 					initErrCh <- retErr
 				}
 			}()
-			ref := initMessage.Ref
+			sessionID := initMessage.SessionID
 			cfg := initMessage.InvokeConfig
 
 			m.sessionMu.Lock()
-			s, ok := m.session[ref]
+			s, ok := m.session[sessionID]
 			if !ok {
 				m.sessionMu.Unlock()
-				return errors.Errorf("invoke: unknown key %v", ref)
+				return errors.Errorf("invoke: unknown session ID %v", sessionID)
 			}
 			m.sessionMu.Unlock()