diff --git a/bake/bake.go b/bake/bake.go
index fc8b9337..b76afb02 100644
--- a/bake/bake.go
+++ b/bake/bake.go
@@ -14,14 +14,12 @@ import (
 
 	"github.com/docker/buildx/bake/hclparser"
 	"github.com/docker/buildx/build"
+	cbuild "github.com/docker/buildx/controller/build"
 	controllerapi "github.com/docker/buildx/controller/pb"
 	"github.com/docker/buildx/util/buildflags"
-	"github.com/docker/buildx/util/platformutil"
-	"github.com/docker/cli/cli/config"
 	"github.com/docker/docker/builder/remotecontext/urlutil"
 	hcl "github.com/hashicorp/hcl/v2"
 	"github.com/moby/buildkit/client/llb"
-	"github.com/moby/buildkit/session/auth/authprovider"
 	"github.com/pkg/errors"
 )
 
@@ -769,7 +767,11 @@ func (t *Target) AddOverrides(overrides map[string]Override) error {
 func TargetsToBuildOpt(m map[string]*Target, inp *Input) (map[string]build.Options, error) {
 	m2 := make(map[string]build.Options, len(m))
 	for k, v := range m {
-		bo, err := toBuildOpt(v, inp)
+		opts, err := toControllerOpt(v, inp)
+		if err != nil {
+			return nil, err
+		}
+		bo, err := cbuild.ToBuildOpts(*opts, nil)
 		if err != nil {
 			return nil, err
 		}
@@ -778,14 +780,14 @@ func TargetsToBuildOpt(m map[string]*Target, inp *Input) (map[string]build.Optio
 	return m2, nil
 }
 
-func updateContext(t *build.Inputs, inp *Input) {
+func updateContext(t *controllerapi.Inputs, inp *Input) error {
 	if inp == nil || inp.State == nil {
-		return
+		return nil
 	}
 
 	for k, v := range t.NamedContexts {
 		if v.Path == "." {
-			t.NamedContexts[k] = build.NamedContext{Path: inp.URL}
+			t.NamedContexts[k] = &controllerapi.NamedContext{Path: inp.URL}
 		}
 		if strings.HasPrefix(v.Path, "cwd://") || strings.HasPrefix(v.Path, "target:") || strings.HasPrefix(v.Path, "docker-image:") {
 			continue
@@ -794,27 +796,36 @@ func updateContext(t *build.Inputs, inp *Input) {
 			continue
 		}
 		st := llb.Scratch().File(llb.Copy(*inp.State, v.Path, "/"), llb.WithCustomNamef("set context %s to %s", k, v.Path))
-		t.NamedContexts[k] = build.NamedContext{State: &st}
+		def, err := st.Marshal(context.TODO())
+		if err != nil {
+			return err
+		}
+		t.NamedContexts[k] = &controllerapi.NamedContext{Definition: def.ToPB()}
 	}
 
 	if t.ContextPath == "." {
 		t.ContextPath = inp.URL
-		return
+		return nil
 	}
 	if strings.HasPrefix(t.ContextPath, "cwd://") {
-		return
+		return nil
 	}
 	if IsRemoteURL(t.ContextPath) {
-		return
+		return nil
 	}
 	st := llb.Scratch().File(llb.Copy(*inp.State, t.ContextPath, "/"), llb.WithCustomNamef("set context to %s", t.ContextPath))
-	t.ContextState = &st
+	def, err := st.Marshal(context.TODO())
+	if err != nil {
+		return err
+	}
+	t.ContextDefinition = def.ToPB()
+	return nil
 }
 
 // validateContextsEntitlements is a basic check to ensure contexts do not
 // escape local directories when loaded from remote sources. This is to be
 // replaced with proper entitlements support in the future.
-func validateContextsEntitlements(t build.Inputs, inp *Input) error {
+func validateContextsEntitlements(t controllerapi.Inputs, inp *Input) error {
 	if inp == nil || inp.State == nil {
 		return nil
 	}
@@ -823,13 +834,13 @@ func validateContextsEntitlements(t build.Inputs, inp *Input) error {
 			return nil
 		}
 	}
-	if t.ContextState == nil {
+	if t.ContextDefinition == nil {
 		if err := checkPath(t.ContextPath); err != nil {
 			return err
 		}
 	}
 	for _, v := range t.NamedContexts {
-		if v.State != nil {
+		if v.Definition != nil {
 			continue
 		}
 		if err := checkPath(v.Path); err != nil {
@@ -864,7 +875,7 @@ func checkPath(p string) error {
 	return nil
 }
 
-func toBuildOpt(t *Target, inp *Input) (*build.Options, error) {
+func toControllerOpt(t *Target, inp *Input) (*controllerapi.BuildOptions, error) {
 	if v := t.Context; v != nil && *v == "-" {
 		return nil, errors.Errorf("context from stdin not allowed in bake")
 	}
@@ -917,9 +928,9 @@ func toBuildOpt(t *Target, inp *Input) (*build.Options, error) {
 		networkMode = *t.NetworkMode
 	}
 
-	bi := build.Inputs{
+	bi := controllerapi.Inputs{
 		ContextPath:    contextPath,
-		DockerfilePath: dockerfilePath,
+		DockerfileName: dockerfilePath,
 		NamedContexts:  toNamedContexts(t.Contexts),
 	}
 	if t.DockerfileInline != nil {
@@ -931,7 +942,7 @@ func toBuildOpt(t *Target, inp *Input) (*build.Options, error) {
 	}
 	for k, v := range bi.NamedContexts {
 		if strings.HasPrefix(v.Path, "cwd://") {
-			bi.NamedContexts[k] = build.NamedContext{Path: path.Clean(strings.TrimPrefix(v.Path, "cwd://"))}
+			bi.NamedContexts[k] = &controllerapi.NamedContext{Path: path.Clean(strings.TrimPrefix(v.Path, "cwd://"))}
 		}
 	}
 
@@ -941,82 +952,55 @@ func toBuildOpt(t *Target, inp *Input) (*build.Options, error) {
 
 	t.Context = &bi.ContextPath
 
-	bo := &build.Options{
-		Inputs:        bi,
+	opts := &controllerapi.BuildOptions{
+		Inputs:        &bi,
 		Tags:          t.Tags,
 		BuildArgs:     args,
 		Labels:        labels,
-		NoCache:       noCache,
 		NoCacheFilter: t.NoCacheFilter,
-		Pull:          pull,
 		NetworkMode:   networkMode,
-		Linked:        t.linked,
+		Opts: &controllerapi.CommonOptions{
+			NoCache: noCache,
+			Pull:    pull,
+			Linked:  t.linked,
+		},
+		Platforms: t.Platforms,
 	}
+	var err error
 
-	platforms, err := platformutil.Parse(t.Platforms)
-	if err != nil {
-		return nil, err
-	}
-	bo.Platforms = platforms
-
-	dockerConfig := config.LoadDefaultConfigFile(os.Stderr)
-	bo.Session = append(bo.Session, authprovider.NewDockerAuthProvider(dockerConfig))
-
-	secrets, err := buildflags.ParseSecretSpecs(t.Secrets)
-	if err != nil {
-		return nil, err
-	}
-	secretAttachment, err := controllerapi.CreateSecrets(secrets)
-	if err != nil {
-		return nil, err
+	if t.Target != nil {
+		opts.Target = *t.Target
 	}
-	bo.Session = append(bo.Session, secretAttachment)
 
-	sshSpecs, err := buildflags.ParseSSHSpecs(t.SSH)
+	opts.Secrets, err = buildflags.ParseSecretSpecs(t.Secrets)
 	if err != nil {
 		return nil, err
 	}
-	if len(sshSpecs) == 0 && buildflags.IsGitSSH(contextPath) {
-		sshSpecs = append(sshSpecs, &controllerapi.SSH{ID: "default"})
-	}
-	sshAttachment, err := controllerapi.CreateSSH(sshSpecs)
+	opts.SSH, err = buildflags.ParseSSHSpecs(t.SSH)
 	if err != nil {
 		return nil, err
 	}
-	bo.Session = append(bo.Session, sshAttachment)
-
-	if t.Target != nil {
-		bo.Target = *t.Target
-	}
 
-	cacheImports, err := buildflags.ParseCacheEntry(t.CacheFrom)
+	opts.CacheFrom, err = buildflags.ParseCacheEntry(t.CacheFrom)
 	if err != nil {
 		return nil, err
 	}
-	bo.CacheFrom = controllerapi.CreateCaches(cacheImports)
-
-	cacheExports, err := buildflags.ParseCacheEntry(t.CacheTo)
+	opts.CacheTo, err = buildflags.ParseCacheEntry(t.CacheTo)
 	if err != nil {
 		return nil, err
 	}
-	bo.CacheTo = controllerapi.CreateCaches(cacheExports)
 
-	outputs, err := buildflags.ParseExports(t.Outputs)
-	if err != nil {
-		return nil, err
-	}
-	bo.Exports, err = controllerapi.CreateExports(outputs)
+	opts.Exports, err = buildflags.ParseExports(t.Outputs)
 	if err != nil {
 		return nil, err
 	}
 
-	attests, err := buildflags.ParseAttests(t.Attest)
+	opts.Attests, err = buildflags.ParseAttests(t.Attest)
 	if err != nil {
 		return nil, err
 	}
-	bo.Attests = controllerapi.CreateAttestations(attests)
 
-	return bo, nil
+	return opts, nil
 }
 
 func defaultTarget() *Target {
@@ -1089,10 +1073,10 @@ func sliceEqual(s1, s2 []string) bool {
 	return true
 }
 
-func toNamedContexts(m map[string]string) map[string]build.NamedContext {
-	m2 := make(map[string]build.NamedContext, len(m))
+func toNamedContexts(m map[string]string) map[string]*controllerapi.NamedContext {
+	m2 := make(map[string]*controllerapi.NamedContext, len(m))
 	for k, v := range m {
-		m2[k] = build.NamedContext{Path: v}
+		m2[k] = &controllerapi.NamedContext{Path: v}
 	}
 	return m2
 }
diff --git a/commands/build.go b/commands/build.go
index fef0b48c..a472bb74 100644
--- a/commands/build.go
+++ b/commands/build.go
@@ -81,23 +81,32 @@ type buildOptions struct {
 
 func (o *buildOptions) toControllerOptions() (controllerapi.BuildOptions, error) {
 	var err error
-	opts := controllerapi.BuildOptions{
-		Allow:          o.allow,
-		BuildArgs:      listToMap(o.buildArgs, true),
-		CgroupParent:   o.cgroupParent,
+
+	inputs := controllerapi.Inputs{
 		ContextPath:    o.contextPath,
 		DockerfileName: o.dockerfileName,
-		ExtraHosts:     o.extraHosts,
-		Labels:         listToMap(o.labels, false),
-		NetworkMode:    o.networkMode,
-		NoCacheFilter:  o.noCacheFilter,
-		Platforms:      o.platforms,
-		PrintFunc:      o.printFunc,
-		ShmSize:        int64(o.shmSize),
-		Tags:           o.tags,
-		Target:         o.target,
-		Ulimits:        dockerUlimitToControllerUlimit(o.ulimits),
-		Opts:           &o.CommonOptions,
+	}
+	inputs.NamedContexts, err = buildflags.ParseContextNames(o.contexts)
+	if err != nil {
+		return controllerapi.BuildOptions{}, err
+	}
+
+	opts := controllerapi.BuildOptions{
+		Inputs:        &inputs,
+		Allow:         o.allow,
+		BuildArgs:     listToMap(o.buildArgs, true),
+		CgroupParent:  o.cgroupParent,
+		ExtraHosts:    o.extraHosts,
+		Labels:        listToMap(o.labels, false),
+		NetworkMode:   o.networkMode,
+		NoCacheFilter: o.noCacheFilter,
+		Platforms:     o.platforms,
+		PrintFunc:     o.printFunc,
+		ShmSize:       int64(o.shmSize),
+		Tags:          o.tags,
+		Target:        o.target,
+		Ulimits:       dockerUlimitToControllerUlimit(o.ulimits),
+		Opts:          &o.CommonOptions,
 	}
 
 	// TODO: extract env var parsing to a method easily usable by library consumers
@@ -119,11 +128,6 @@ func (o *buildOptions) toControllerOptions() (controllerapi.BuildOptions, error)
 		return controllerapi.BuildOptions{}, err
 	}
 
-	opts.NamedContexts, err = buildflags.ParseContextNames(o.contexts)
-	if err != nil {
-		return controllerapi.BuildOptions{}, err
-	}
-
 	opts.Exports, err = buildflags.ParseExports(o.outputs)
 	if err != nil {
 		return controllerapi.BuildOptions{}, err
@@ -669,45 +673,6 @@ func dockerUlimitToControllerUlimit(u *dockeropts.UlimitOpt) *controllerapi.Ulim
 // resolvePaths resolves all paths contained in controllerapi.BuildOptions
 // and replaces them to absolute paths.
 func resolvePaths(options *controllerapi.BuildOptions) (_ *controllerapi.BuildOptions, err error) {
-	if options.ContextPath != "" && options.ContextPath != "-" {
-		options.ContextPath, err = filepath.Abs(options.ContextPath)
-		if err != nil {
-			return nil, err
-		}
-	}
-	if options.DockerfileName != "" && options.DockerfileName != "-" {
-		options.DockerfileName, err = filepath.Abs(options.DockerfileName)
-		if err != nil {
-			return nil, err
-		}
-	}
-	var contexts map[string]string
-	for k, v := range options.NamedContexts {
-		if urlutil.IsGitURL(v) || urlutil.IsURL(v) || strings.HasPrefix(v, "docker-image://") {
-			// url prefix, this is a remote path
-		} else if strings.HasPrefix(v, "oci-layout://") {
-			// oci layout prefix, this is a local path
-			p := strings.TrimPrefix(v, "oci-layout://")
-			p, err = filepath.Abs(p)
-			if err != nil {
-				return nil, err
-			}
-			v = "oci-layout://" + p
-		} else {
-			// no prefix, assume local path
-			v, err = filepath.Abs(v)
-			if err != nil {
-				return nil, err
-			}
-		}
-
-		if contexts == nil {
-			contexts = make(map[string]string)
-		}
-		contexts[k] = v
-	}
-	options.NamedContexts = contexts
-
 	var cacheFrom []*controllerapi.CacheOptionsEntry
 	for _, co := range options.CacheFrom {
 		switch co.Type {
@@ -819,5 +784,50 @@ func resolvePaths(options *controllerapi.BuildOptions) (_ *controllerapi.BuildOp
 		}
 	}
 
+	if options.Inputs == nil {
+		return options, nil
+	}
+	if options.Inputs.ContextPath != "" && options.Inputs.ContextPath != "-" {
+		options.Inputs.ContextPath, err = filepath.Abs(options.Inputs.ContextPath)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if options.Inputs.DockerfileName != "" && options.Inputs.DockerfileName != "-" {
+		options.Inputs.DockerfileName, err = filepath.Abs(options.Inputs.DockerfileName)
+		if err != nil {
+			return nil, err
+		}
+	}
+	var contexts map[string]*controllerapi.NamedContext
+	for k, v := range options.Inputs.NamedContexts {
+		v := *v
+		if v.Definition != nil {
+			// definition, no path
+		} else if urlutil.IsGitURL(v.Path) || urlutil.IsURL(v.Path) || strings.HasPrefix(v.Path, "docker-image://") {
+			// url prefix, this is a remote path
+		} else if strings.HasPrefix(v.Path, "oci-layout://") {
+			// oci layout prefix, this is a local path
+			p := strings.TrimPrefix(v.Path, "oci-layout://")
+			p, err = filepath.Abs(p)
+			if err != nil {
+				return nil, err
+			}
+			v.Path = "oci-layout://" + p
+		} else {
+			// no prefix, assume local path
+			v.Path, err = filepath.Abs(v.Path)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if contexts == nil {
+			contexts = make(map[string]*controllerapi.NamedContext)
+		}
+		contexts[k] = &v
+	}
+	options.Inputs.NamedContexts = contexts
+
 	return options, nil
 }
diff --git a/commands/build_test.go b/commands/build_test.go
index 1a7f335e..85694f51 100644
--- a/commands/build_test.go
+++ b/commands/build_test.go
@@ -21,36 +21,68 @@ func TestResolvePaths(t *testing.T) {
 		want    controllerapi.BuildOptions
 	}{
 		{
-			name:    "contextpath",
-			options: controllerapi.BuildOptions{ContextPath: "test"},
-			want:    controllerapi.BuildOptions{ContextPath: filepath.Join(tmpwd, "test")},
+			name: "contextpath",
+			options: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{ContextPath: "test"},
+			},
+			want: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{ContextPath: filepath.Join(tmpwd, "test")},
+			},
 		},
 		{
-			name:    "contextpath-cwd",
-			options: controllerapi.BuildOptions{ContextPath: "."},
-			want:    controllerapi.BuildOptions{ContextPath: tmpwd},
+			name: "contextpath-cwd",
+			options: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{ContextPath: "."},
+			},
+			want: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{ContextPath: tmpwd},
+			},
 		},
 		{
-			name:    "contextpath-dash",
-			options: controllerapi.BuildOptions{ContextPath: "-"},
-			want:    controllerapi.BuildOptions{ContextPath: "-"},
+			name: "contextpath-dash",
+			options: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{ContextPath: "-"},
+			},
+			want: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{ContextPath: "-"},
+			},
 		},
 		{
-			name:    "dockerfilename",
-			options: controllerapi.BuildOptions{DockerfileName: "test"},
-			want:    controllerapi.BuildOptions{DockerfileName: filepath.Join(tmpwd, "test")},
+			name: "dockerfilename",
+			options: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{DockerfileName: "test"},
+			},
+			want: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{DockerfileName: filepath.Join(tmpwd, "test")},
+			},
 		},
 		{
-			name:    "dockerfilename-dash",
-			options: controllerapi.BuildOptions{DockerfileName: "-"},
-			want:    controllerapi.BuildOptions{DockerfileName: "-"},
+			name: "dockerfilename-dash",
+			options: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{DockerfileName: "-"},
+			},
+			want: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{DockerfileName: "-"},
+			},
 		},
 		{
 			name: "contexts",
-			options: controllerapi.BuildOptions{NamedContexts: map[string]string{"a": "test1", "b": "test2",
-				"alpine": "docker-image://alpine@sha256:0123456789", "project": "https://github.com/myuser/project.git"}},
-			want: controllerapi.BuildOptions{NamedContexts: map[string]string{"a": filepath.Join(tmpwd, "test1"), "b": filepath.Join(tmpwd, "test2"),
-				"alpine": "docker-image://alpine@sha256:0123456789", "project": "https://github.com/myuser/project.git"}},
+			options: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{NamedContexts: map[string]*controllerapi.NamedContext{
+					"a":       {Path: "test1"},
+					"b":       {Path: "test2"},
+					"alpine":  {Path: "docker-image://alpine@sha256:0123456789"},
+					"project": {Path: "https://github.com/myuser/project.git"},
+				},
+				}},
+			want: controllerapi.BuildOptions{
+				Inputs: &controllerapi.Inputs{NamedContexts: map[string]*controllerapi.NamedContext{
+					"a":       {Path: filepath.Join(tmpwd, "test1")},
+					"b":       {Path: filepath.Join(tmpwd, "test2")},
+					"alpine":  {Path: "docker-image://alpine@sha256:0123456789"},
+					"project": {Path: "https://github.com/myuser/project.git"},
+				},
+				}},
 		},
 		{
 			name: "cache-from",
diff --git a/controller/build/build.go b/controller/build/build.go
index 12fa8580..f6196b58 100644
--- a/controller/build/build.go
+++ b/controller/build/build.go
@@ -29,6 +29,7 @@ import (
 	"github.com/docker/docker/pkg/ioutils"
 	"github.com/docker/go-units"
 	"github.com/moby/buildkit/client"
+	"github.com/moby/buildkit/client/llb"
 	"github.com/moby/buildkit/session/auth/authprovider"
 	"github.com/moby/buildkit/solver/errdefs"
 	"github.com/moby/buildkit/util/grpcerrors"
@@ -42,26 +43,82 @@ import (
 const defaultTargetName = "default"
 
 func RunBuild(ctx context.Context, dockerCli command.Cli, in controllerapi.BuildOptions, inStream io.Reader, progressMode string, statusChan chan *client.SolveStatus) (*client.SolveResponse, *build.ResultContext, error) {
+	opts, err := ToBuildOpts(in, inStream)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// key string used for kubernetes "sticky" mode
+	contextPathHash, err := filepath.Abs(in.Inputs.ContextPath)
+	if err != nil {
+		contextPathHash = in.Inputs.ContextPath
+	}
+
+	b, err := builder.New(dockerCli,
+		builder.WithName(in.Opts.Builder),
+		builder.WithContextPathHash(contextPathHash),
+	)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err = updateLastActivity(dockerCli, b.NodeGroup); err != nil {
+		return nil, nil, errors.Wrapf(err, "failed to update builder last activity time")
+	}
+	nodes, err := b.LoadNodes(ctx, false)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	resp, res, err := buildTargets(ctx, dockerCli, b.NodeGroup, nodes, map[string]build.Options{defaultTargetName: *opts}, progressMode, in.Opts.MetadataFile, statusChan)
+	err = wrapBuildError(err, false)
+	if err != nil {
+		return nil, nil, err
+	}
+	return resp, res, nil
+}
+
+func ToBuildOpts(in controllerapi.BuildOptions, inStream io.Reader) (*build.Options, error) {
 	if in.Opts.NoCache && len(in.NoCacheFilter) > 0 {
-		return nil, nil, errors.Errorf("--no-cache and --no-cache-filter cannot currently be used together")
+		return nil, errors.Errorf("--no-cache and --no-cache-filter cannot currently be used together")
+	}
+
+	var context *llb.State
+	if in.Inputs.ContextDefinition != nil {
+		defop, err := llb.NewDefinitionOp(in.Inputs.ContextDefinition)
+		if err != nil {
+			return nil, err
+		}
+		st := llb.NewState(defop)
+		context = &st
 	}
 
 	contexts := map[string]build.NamedContext{}
-	for name, path := range in.NamedContexts {
-		contexts[name] = build.NamedContext{Path: path}
+	for name, context := range in.Inputs.NamedContexts {
+		if context.Definition != nil {
+			defop, err := llb.NewDefinitionOp(context.Definition)
+			if err != nil {
+				return nil, err
+			}
+			st := llb.NewState(defop)
+			contexts[name] = build.NamedContext{State: &st}
+		} else {
+			contexts[name] = build.NamedContext{Path: context.Path}
+		}
 	}
 
 	printFunc, err := parsePrintFunc(in.PrintFunc)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 
 	opts := build.Options{
 		Inputs: build.Inputs{
-			ContextPath:    in.ContextPath,
-			DockerfilePath: in.DockerfileName,
-			InStream:       inStream,
-			NamedContexts:  contexts,
+			ContextPath:      in.Inputs.ContextPath,
+			DockerfilePath:   in.Inputs.DockerfileName,
+			DockerfileInline: in.Inputs.DockerfileInline,
+			ContextState:     context,
+			InStream:         inStream,
+			NamedContexts:    contexts,
 		},
 		BuildArgs:     in.BuildArgs,
 		ExtraHosts:    in.ExtraHosts,
@@ -79,7 +136,7 @@ func RunBuild(ctx context.Context, dockerCli command.Cli, in controllerapi.Build
 
 	platforms, err := platformutil.Parse(in.Platforms)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 	opts.Platforms = platforms
 
@@ -88,27 +145,27 @@ func RunBuild(ctx context.Context, dockerCli command.Cli, in controllerapi.Build
 
 	secrets, err := controllerapi.CreateSecrets(in.Secrets)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 	opts.Session = append(opts.Session, secrets)
 
 	sshSpecs := in.SSH
-	if len(sshSpecs) == 0 && buildflags.IsGitSSH(in.ContextPath) {
+	if len(sshSpecs) == 0 && buildflags.IsGitSSH(in.Inputs.ContextPath) {
 		sshSpecs = append(sshSpecs, &controllerapi.SSH{ID: "default"})
 	}
 	ssh, err := controllerapi.CreateSSH(sshSpecs)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 	opts.Session = append(opts.Session, ssh)
 
 	outputs, err := controllerapi.CreateExports(in.Exports)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 	if in.Opts.ExportPush {
 		if in.Opts.ExportLoad {
-			return nil, nil, errors.Errorf("push and load may not be set together at the moment")
+			return nil, errors.Errorf("push and load may not be set together at the moment")
 		}
 		if len(outputs) == 0 {
 			outputs = []client.ExportEntry{{
@@ -122,7 +179,7 @@ func RunBuild(ctx context.Context, dockerCli command.Cli, in controllerapi.Build
 			case "image":
 				outputs[0].Attrs["push"] = "true"
 			default:
-				return nil, nil, errors.Errorf("push and %q output can't be used together", outputs[0].Type)
+				return nil, errors.Errorf("push and %q output can't be used together", outputs[0].Type)
 			}
 		}
 	}
@@ -136,7 +193,7 @@ func RunBuild(ctx context.Context, dockerCli command.Cli, in controllerapi.Build
 			switch outputs[0].Type {
 			case "docker":
 			default:
-				return nil, nil, errors.Errorf("load and %q output can't be used together", outputs[0].Type)
+				return nil, errors.Errorf("load and %q output can't be used together", outputs[0].Type)
 			}
 		}
 	}
@@ -149,37 +206,11 @@ func RunBuild(ctx context.Context, dockerCli command.Cli, in controllerapi.Build
 
 	allow, err := buildflags.ParseEntitlements(in.Allow)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 	opts.Allow = allow
 
-	// key string used for kubernetes "sticky" mode
-	contextPathHash, err := filepath.Abs(in.ContextPath)
-	if err != nil {
-		contextPathHash = in.ContextPath
-	}
-
-	b, err := builder.New(dockerCli,
-		builder.WithName(in.Opts.Builder),
-		builder.WithContextPathHash(contextPathHash),
-	)
-	if err != nil {
-		return nil, nil, err
-	}
-	if err = updateLastActivity(dockerCli, b.NodeGroup); err != nil {
-		return nil, nil, errors.Wrapf(err, "failed to update builder last activity time")
-	}
-	nodes, err := b.LoadNodes(ctx, false)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	resp, res, err := buildTargets(ctx, dockerCli, b.NodeGroup, nodes, map[string]build.Options{defaultTargetName: opts}, progressMode, in.Opts.MetadataFile, statusChan)
-	err = wrapBuildError(err, false)
-	if err != nil {
-		return nil, nil, err
-	}
-	return resp, res, nil
+	return &opts, nil
 }
 
 func buildTargets(ctx context.Context, dockerCli command.Cli, ng *store.NodeGroup, nodes []builder.Node, opts map[string]build.Options, progressMode string, metadataFile string, statusChan chan *client.SolveStatus) (*client.SolveResponse, *build.ResultContext, error) {
diff --git a/controller/pb/controller.pb.go b/controller/pb/controller.pb.go
index ec675210..ab8708fb 100644
--- a/controller/pb/controller.pb.go
+++ b/controller/pb/controller.pb.go
@@ -8,6 +8,7 @@ import (
 	fmt "fmt"
 	proto "github.com/gogo/protobuf/proto"
 	control "github.com/moby/buildkit/api/services/control"
+	pb "github.com/moby/buildkit/solver/pb"
 	grpc "google.golang.org/grpc"
 	codes "google.golang.org/grpc/codes"
 	status "google.golang.org/grpc/status"
@@ -269,30 +270,98 @@ func (m *BuildRequest) GetOptions() *BuildOptions {
 	return nil
 }
 
+type Inputs struct {
+	ContextPath          string                   `protobuf:"bytes,1,opt,name=ContextPath,proto3" json:"ContextPath,omitempty"`
+	DockerfileName       string                   `protobuf:"bytes,2,opt,name=DockerfileName,proto3" json:"DockerfileName,omitempty"`
+	DockerfileInline     string                   `protobuf:"bytes,3,opt,name=DockerfileInline,proto3" json:"DockerfileInline,omitempty"`
+	ContextDefinition    *pb.Definition           `protobuf:"bytes,4,opt,name=ContextDefinition,proto3" json:"ContextDefinition,omitempty"`
+	NamedContexts        map[string]*NamedContext `protobuf:"bytes,5,rep,name=NamedContexts,proto3" json:"NamedContexts,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
+	XXX_unrecognized     []byte                   `json:"-"`
+	XXX_sizecache        int32                    `json:"-"`
+}
+
+func (m *Inputs) Reset()         { *m = Inputs{} }
+func (m *Inputs) String() string { return proto.CompactTextString(m) }
+func (*Inputs) ProtoMessage()    {}
+func (*Inputs) Descriptor() ([]byte, []int) {
+	return fileDescriptor_ed7f10298fa1d90f, []int{6}
+}
+func (m *Inputs) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Inputs.Unmarshal(m, b)
+}
+func (m *Inputs) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Inputs.Marshal(b, m, deterministic)
+}
+func (m *Inputs) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Inputs.Merge(m, src)
+}
+func (m *Inputs) XXX_Size() int {
+	return xxx_messageInfo_Inputs.Size(m)
+}
+func (m *Inputs) XXX_DiscardUnknown() {
+	xxx_messageInfo_Inputs.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Inputs proto.InternalMessageInfo
+
+func (m *Inputs) GetContextPath() string {
+	if m != nil {
+		return m.ContextPath
+	}
+	return ""
+}
+
+func (m *Inputs) GetDockerfileName() string {
+	if m != nil {
+		return m.DockerfileName
+	}
+	return ""
+}
+
+func (m *Inputs) GetDockerfileInline() string {
+	if m != nil {
+		return m.DockerfileInline
+	}
+	return ""
+}
+
+func (m *Inputs) GetContextDefinition() *pb.Definition {
+	if m != nil {
+		return m.ContextDefinition
+	}
+	return nil
+}
+
+func (m *Inputs) GetNamedContexts() map[string]*NamedContext {
+	if m != nil {
+		return m.NamedContexts
+	}
+	return nil
+}
+
 type BuildOptions struct {
-	ContextPath          string               `protobuf:"bytes,1,opt,name=ContextPath,proto3" json:"ContextPath,omitempty"`
-	DockerfileName       string               `protobuf:"bytes,2,opt,name=DockerfileName,proto3" json:"DockerfileName,omitempty"`
-	PrintFunc            string               `protobuf:"bytes,3,opt,name=PrintFunc,proto3" json:"PrintFunc,omitempty"`
-	NamedContexts        map[string]string    `protobuf:"bytes,4,rep,name=NamedContexts,proto3" json:"NamedContexts,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	Allow                []string             `protobuf:"bytes,5,rep,name=Allow,proto3" json:"Allow,omitempty"`
-	Attests              []*Attest            `protobuf:"bytes,6,rep,name=Attests,proto3" json:"Attests,omitempty"`
-	BuildArgs            map[string]string    `protobuf:"bytes,7,rep,name=BuildArgs,proto3" json:"BuildArgs,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	CacheFrom            []*CacheOptionsEntry `protobuf:"bytes,8,rep,name=CacheFrom,proto3" json:"CacheFrom,omitempty"`
-	CacheTo              []*CacheOptionsEntry `protobuf:"bytes,9,rep,name=CacheTo,proto3" json:"CacheTo,omitempty"`
-	CgroupParent         string               `protobuf:"bytes,10,opt,name=CgroupParent,proto3" json:"CgroupParent,omitempty"`
-	Exports              []*ExportEntry       `protobuf:"bytes,11,rep,name=Exports,proto3" json:"Exports,omitempty"`
-	ExtraHosts           []string             `protobuf:"bytes,12,rep,name=ExtraHosts,proto3" json:"ExtraHosts,omitempty"`
-	Labels               map[string]string    `protobuf:"bytes,13,rep,name=Labels,proto3" json:"Labels,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	NetworkMode          string               `protobuf:"bytes,14,opt,name=NetworkMode,proto3" json:"NetworkMode,omitempty"`
-	NoCacheFilter        []string             `protobuf:"bytes,15,rep,name=NoCacheFilter,proto3" json:"NoCacheFilter,omitempty"`
-	Platforms            []string             `protobuf:"bytes,16,rep,name=Platforms,proto3" json:"Platforms,omitempty"`
-	Secrets              []*Secret            `protobuf:"bytes,17,rep,name=Secrets,proto3" json:"Secrets,omitempty"`
-	ShmSize              int64                `protobuf:"varint,18,opt,name=ShmSize,proto3" json:"ShmSize,omitempty"`
-	SSH                  []*SSH               `protobuf:"bytes,19,rep,name=SSH,proto3" json:"SSH,omitempty"`
-	Tags                 []string             `protobuf:"bytes,20,rep,name=Tags,proto3" json:"Tags,omitempty"`
-	Target               string               `protobuf:"bytes,21,opt,name=Target,proto3" json:"Target,omitempty"`
-	Ulimits              *UlimitOpt           `protobuf:"bytes,22,opt,name=Ulimits,proto3" json:"Ulimits,omitempty"`
-	Opts                 *CommonOptions       `protobuf:"bytes,24,opt,name=Opts,proto3" json:"Opts,omitempty"`
+	Inputs               *Inputs              `protobuf:"bytes,1,opt,name=inputs,proto3" json:"inputs,omitempty"`
+	PrintFunc            string               `protobuf:"bytes,2,opt,name=PrintFunc,proto3" json:"PrintFunc,omitempty"`
+	Allow                []string             `protobuf:"bytes,3,rep,name=Allow,proto3" json:"Allow,omitempty"`
+	Attests              []*Attest            `protobuf:"bytes,4,rep,name=Attests,proto3" json:"Attests,omitempty"`
+	BuildArgs            map[string]string    `protobuf:"bytes,5,rep,name=BuildArgs,proto3" json:"BuildArgs,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	CacheFrom            []*CacheOptionsEntry `protobuf:"bytes,6,rep,name=CacheFrom,proto3" json:"CacheFrom,omitempty"`
+	CacheTo              []*CacheOptionsEntry `protobuf:"bytes,7,rep,name=CacheTo,proto3" json:"CacheTo,omitempty"`
+	CgroupParent         string               `protobuf:"bytes,8,opt,name=CgroupParent,proto3" json:"CgroupParent,omitempty"`
+	Exports              []*ExportEntry       `protobuf:"bytes,9,rep,name=Exports,proto3" json:"Exports,omitempty"`
+	ExtraHosts           []string             `protobuf:"bytes,10,rep,name=ExtraHosts,proto3" json:"ExtraHosts,omitempty"`
+	Labels               map[string]string    `protobuf:"bytes,11,rep,name=Labels,proto3" json:"Labels,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	NetworkMode          string               `protobuf:"bytes,12,opt,name=NetworkMode,proto3" json:"NetworkMode,omitempty"`
+	NoCacheFilter        []string             `protobuf:"bytes,13,rep,name=NoCacheFilter,proto3" json:"NoCacheFilter,omitempty"`
+	Platforms            []string             `protobuf:"bytes,14,rep,name=Platforms,proto3" json:"Platforms,omitempty"`
+	Secrets              []*Secret            `protobuf:"bytes,15,rep,name=Secrets,proto3" json:"Secrets,omitempty"`
+	ShmSize              int64                `protobuf:"varint,16,opt,name=ShmSize,proto3" json:"ShmSize,omitempty"`
+	SSH                  []*SSH               `protobuf:"bytes,17,rep,name=SSH,proto3" json:"SSH,omitempty"`
+	Tags                 []string             `protobuf:"bytes,18,rep,name=Tags,proto3" json:"Tags,omitempty"`
+	Target               string               `protobuf:"bytes,19,opt,name=Target,proto3" json:"Target,omitempty"`
+	Ulimits              *UlimitOpt           `protobuf:"bytes,20,opt,name=Ulimits,proto3" json:"Ulimits,omitempty"`
+	Opts                 *CommonOptions       `protobuf:"bytes,21,opt,name=Opts,proto3" json:"Opts,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}             `json:"-"`
 	XXX_unrecognized     []byte               `json:"-"`
 	XXX_sizecache        int32                `json:"-"`
@@ -302,7 +371,7 @@ func (m *BuildOptions) Reset()         { *m = BuildOptions{} }
 func (m *BuildOptions) String() string { return proto.CompactTextString(m) }
 func (*BuildOptions) ProtoMessage()    {}
 func (*BuildOptions) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{6}
+	return fileDescriptor_ed7f10298fa1d90f, []int{7}
 }
 func (m *BuildOptions) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BuildOptions.Unmarshal(m, b)
@@ -322,18 +391,11 @@ func (m *BuildOptions) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_BuildOptions proto.InternalMessageInfo
 
-func (m *BuildOptions) GetContextPath() string {
-	if m != nil {
-		return m.ContextPath
-	}
-	return ""
-}
-
-func (m *BuildOptions) GetDockerfileName() string {
+func (m *BuildOptions) GetInputs() *Inputs {
 	if m != nil {
-		return m.DockerfileName
+		return m.Inputs
 	}
-	return ""
+	return nil
 }
 
 func (m *BuildOptions) GetPrintFunc() string {
@@ -343,13 +405,6 @@ func (m *BuildOptions) GetPrintFunc() string {
 	return ""
 }
 
-func (m *BuildOptions) GetNamedContexts() map[string]string {
-	if m != nil {
-		return m.NamedContexts
-	}
-	return nil
-}
-
 func (m *BuildOptions) GetAllow() []string {
 	if m != nil {
 		return m.Allow
@@ -496,7 +551,7 @@ func (m *ExportEntry) Reset()         { *m = ExportEntry{} }
 func (m *ExportEntry) String() string { return proto.CompactTextString(m) }
 func (*ExportEntry) ProtoMessage()    {}
 func (*ExportEntry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{7}
+	return fileDescriptor_ed7f10298fa1d90f, []int{8}
 }
 func (m *ExportEntry) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ExportEntry.Unmarshal(m, b)
@@ -549,7 +604,7 @@ func (m *CacheOptionsEntry) Reset()         { *m = CacheOptionsEntry{} }
 func (m *CacheOptionsEntry) String() string { return proto.CompactTextString(m) }
 func (*CacheOptionsEntry) ProtoMessage()    {}
 func (*CacheOptionsEntry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{8}
+	return fileDescriptor_ed7f10298fa1d90f, []int{9}
 }
 func (m *CacheOptionsEntry) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CacheOptionsEntry.Unmarshal(m, b)
@@ -596,7 +651,7 @@ func (m *Attest) Reset()         { *m = Attest{} }
 func (m *Attest) String() string { return proto.CompactTextString(m) }
 func (*Attest) ProtoMessage()    {}
 func (*Attest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{9}
+	return fileDescriptor_ed7f10298fa1d90f, []int{10}
 }
 func (m *Attest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Attest.Unmarshal(m, b)
@@ -649,7 +704,7 @@ func (m *SSH) Reset()         { *m = SSH{} }
 func (m *SSH) String() string { return proto.CompactTextString(m) }
 func (*SSH) ProtoMessage()    {}
 func (*SSH) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{10}
+	return fileDescriptor_ed7f10298fa1d90f, []int{11}
 }
 func (m *SSH) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SSH.Unmarshal(m, b)
@@ -696,7 +751,7 @@ func (m *Secret) Reset()         { *m = Secret{} }
 func (m *Secret) String() string { return proto.CompactTextString(m) }
 func (*Secret) ProtoMessage()    {}
 func (*Secret) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{11}
+	return fileDescriptor_ed7f10298fa1d90f, []int{12}
 }
 func (m *Secret) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Secret.Unmarshal(m, b)
@@ -737,6 +792,52 @@ func (m *Secret) GetEnv() string {
 	return ""
 }
 
+type NamedContext struct {
+	Path                 string         `protobuf:"bytes,1,opt,name=Path,proto3" json:"Path,omitempty"`
+	Definition           *pb.Definition `protobuf:"bytes,2,opt,name=Definition,proto3" json:"Definition,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
+	XXX_unrecognized     []byte         `json:"-"`
+	XXX_sizecache        int32          `json:"-"`
+}
+
+func (m *NamedContext) Reset()         { *m = NamedContext{} }
+func (m *NamedContext) String() string { return proto.CompactTextString(m) }
+func (*NamedContext) ProtoMessage()    {}
+func (*NamedContext) Descriptor() ([]byte, []int) {
+	return fileDescriptor_ed7f10298fa1d90f, []int{13}
+}
+func (m *NamedContext) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_NamedContext.Unmarshal(m, b)
+}
+func (m *NamedContext) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_NamedContext.Marshal(b, m, deterministic)
+}
+func (m *NamedContext) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_NamedContext.Merge(m, src)
+}
+func (m *NamedContext) XXX_Size() int {
+	return xxx_messageInfo_NamedContext.Size(m)
+}
+func (m *NamedContext) XXX_DiscardUnknown() {
+	xxx_messageInfo_NamedContext.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_NamedContext proto.InternalMessageInfo
+
+func (m *NamedContext) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+func (m *NamedContext) GetDefinition() *pb.Definition {
+	if m != nil {
+		return m.Definition
+	}
+	return nil
+}
+
 type UlimitOpt struct {
 	Values               map[string]*Ulimit `protobuf:"bytes,1,rep,name=values,proto3" json:"values,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
@@ -748,7 +849,7 @@ func (m *UlimitOpt) Reset()         { *m = UlimitOpt{} }
 func (m *UlimitOpt) String() string { return proto.CompactTextString(m) }
 func (*UlimitOpt) ProtoMessage()    {}
 func (*UlimitOpt) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{12}
+	return fileDescriptor_ed7f10298fa1d90f, []int{14}
 }
 func (m *UlimitOpt) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_UlimitOpt.Unmarshal(m, b)
@@ -788,7 +889,7 @@ func (m *Ulimit) Reset()         { *m = Ulimit{} }
 func (m *Ulimit) String() string { return proto.CompactTextString(m) }
 func (*Ulimit) ProtoMessage()    {}
 func (*Ulimit) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{13}
+	return fileDescriptor_ed7f10298fa1d90f, []int{15}
 }
 func (m *Ulimit) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Ulimit.Unmarshal(m, b)
@@ -834,9 +935,14 @@ type CommonOptions struct {
 	MetadataFile string `protobuf:"bytes,2,opt,name=MetadataFile,proto3" json:"MetadataFile,omitempty"`
 	NoCache      bool   `protobuf:"varint,3,opt,name=NoCache,proto3" json:"NoCache,omitempty"`
 	// string Progress: no progress view on server side
-	Pull                 bool     `protobuf:"varint,4,opt,name=Pull,proto3" json:"Pull,omitempty"`
-	ExportPush           bool     `protobuf:"varint,5,opt,name=ExportPush,proto3" json:"ExportPush,omitempty"`
-	ExportLoad           bool     `protobuf:"varint,6,opt,name=ExportLoad,proto3" json:"ExportLoad,omitempty"`
+	Pull       bool `protobuf:"varint,4,opt,name=Pull,proto3" json:"Pull,omitempty"`
+	ExportPush bool `protobuf:"varint,5,opt,name=ExportPush,proto3" json:"ExportPush,omitempty"`
+	ExportLoad bool `protobuf:"varint,6,opt,name=ExportLoad,proto3" json:"ExportLoad,omitempty"`
+	// TODO: we should remove Linked from the controllerapi, it's only used to
+	// produce a single warning. To allow this, we need to move the default
+	// export detection out from the controller server, as well as load the
+	// driver on the controller client.
+	Linked               bool     `protobuf:"varint,7,opt,name=Linked,proto3" json:"Linked,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -846,7 +952,7 @@ func (m *CommonOptions) Reset()         { *m = CommonOptions{} }
 func (m *CommonOptions) String() string { return proto.CompactTextString(m) }
 func (*CommonOptions) ProtoMessage()    {}
 func (*CommonOptions) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{14}
+	return fileDescriptor_ed7f10298fa1d90f, []int{16}
 }
 func (m *CommonOptions) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CommonOptions.Unmarshal(m, b)
@@ -908,6 +1014,13 @@ func (m *CommonOptions) GetExportLoad() bool {
 	return false
 }
 
+func (m *CommonOptions) GetLinked() bool {
+	if m != nil {
+		return m.Linked
+	}
+	return false
+}
+
 type BuildResponse struct {
 	ExporterResponse     map[string]string `protobuf:"bytes,1,rep,name=ExporterResponse,proto3" json:"ExporterResponse,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
@@ -919,7 +1032,7 @@ func (m *BuildResponse) Reset()         { *m = BuildResponse{} }
 func (m *BuildResponse) String() string { return proto.CompactTextString(m) }
 func (*BuildResponse) ProtoMessage()    {}
 func (*BuildResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{15}
+	return fileDescriptor_ed7f10298fa1d90f, []int{17}
 }
 func (m *BuildResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BuildResponse.Unmarshal(m, b)
@@ -957,7 +1070,7 @@ func (m *DisconnectRequest) Reset()         { *m = DisconnectRequest{} }
 func (m *DisconnectRequest) String() string { return proto.CompactTextString(m) }
 func (*DisconnectRequest) ProtoMessage()    {}
 func (*DisconnectRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{16}
+	return fileDescriptor_ed7f10298fa1d90f, []int{18}
 }
 func (m *DisconnectRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DisconnectRequest.Unmarshal(m, b)
@@ -994,7 +1107,7 @@ func (m *DisconnectResponse) Reset()         { *m = DisconnectResponse{} }
 func (m *DisconnectResponse) String() string { return proto.CompactTextString(m) }
 func (*DisconnectResponse) ProtoMessage()    {}
 func (*DisconnectResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{17}
+	return fileDescriptor_ed7f10298fa1d90f, []int{19}
 }
 func (m *DisconnectResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DisconnectResponse.Unmarshal(m, b)
@@ -1025,7 +1138,7 @@ func (m *ListRequest) Reset()         { *m = ListRequest{} }
 func (m *ListRequest) String() string { return proto.CompactTextString(m) }
 func (*ListRequest) ProtoMessage()    {}
 func (*ListRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{18}
+	return fileDescriptor_ed7f10298fa1d90f, []int{20}
 }
 func (m *ListRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListRequest.Unmarshal(m, b)
@@ -1063,7 +1176,7 @@ func (m *ListResponse) Reset()         { *m = ListResponse{} }
 func (m *ListResponse) String() string { return proto.CompactTextString(m) }
 func (*ListResponse) ProtoMessage()    {}
 func (*ListResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{19}
+	return fileDescriptor_ed7f10298fa1d90f, []int{21}
 }
 func (m *ListResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ListResponse.Unmarshal(m, b)
@@ -1104,7 +1217,7 @@ func (m *InputMessage) Reset()         { *m = InputMessage{} }
 func (m *InputMessage) String() string { return proto.CompactTextString(m) }
 func (*InputMessage) ProtoMessage()    {}
 func (*InputMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{20}
+	return fileDescriptor_ed7f10298fa1d90f, []int{22}
 }
 func (m *InputMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InputMessage.Unmarshal(m, b)
@@ -1178,7 +1291,7 @@ func (m *InputInitMessage) Reset()         { *m = InputInitMessage{} }
 func (m *InputInitMessage) String() string { return proto.CompactTextString(m) }
 func (*InputInitMessage) ProtoMessage()    {}
 func (*InputInitMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{21}
+	return fileDescriptor_ed7f10298fa1d90f, []int{23}
 }
 func (m *InputInitMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InputInitMessage.Unmarshal(m, b)
@@ -1217,7 +1330,7 @@ func (m *DataMessage) Reset()         { *m = DataMessage{} }
 func (m *DataMessage) String() string { return proto.CompactTextString(m) }
 func (*DataMessage) ProtoMessage()    {}
 func (*DataMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{22}
+	return fileDescriptor_ed7f10298fa1d90f, []int{24}
 }
 func (m *DataMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DataMessage.Unmarshal(m, b)
@@ -1261,7 +1374,7 @@ func (m *InputResponse) Reset()         { *m = InputResponse{} }
 func (m *InputResponse) String() string { return proto.CompactTextString(m) }
 func (*InputResponse) ProtoMessage()    {}
 func (*InputResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{23}
+	return fileDescriptor_ed7f10298fa1d90f, []int{25}
 }
 func (m *InputResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InputResponse.Unmarshal(m, b)
@@ -1297,7 +1410,7 @@ func (m *Message) Reset()         { *m = Message{} }
 func (m *Message) String() string { return proto.CompactTextString(m) }
 func (*Message) ProtoMessage()    {}
 func (*Message) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{24}
+	return fileDescriptor_ed7f10298fa1d90f, []int{26}
 }
 func (m *Message) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Message.Unmarshal(m, b)
@@ -1399,7 +1512,7 @@ func (m *InitMessage) Reset()         { *m = InitMessage{} }
 func (m *InitMessage) String() string { return proto.CompactTextString(m) }
 func (*InitMessage) ProtoMessage()    {}
 func (*InitMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{25}
+	return fileDescriptor_ed7f10298fa1d90f, []int{27}
 }
 func (m *InitMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InitMessage.Unmarshal(m, b)
@@ -1459,7 +1572,7 @@ func (m *InvokeConfig) Reset()         { *m = InvokeConfig{} }
 func (m *InvokeConfig) String() string { return proto.CompactTextString(m) }
 func (*InvokeConfig) ProtoMessage()    {}
 func (*InvokeConfig) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{26}
+	return fileDescriptor_ed7f10298fa1d90f, []int{28}
 }
 func (m *InvokeConfig) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InvokeConfig.Unmarshal(m, b)
@@ -1555,7 +1668,7 @@ func (m *FdMessage) Reset()         { *m = FdMessage{} }
 func (m *FdMessage) String() string { return proto.CompactTextString(m) }
 func (*FdMessage) ProtoMessage()    {}
 func (*FdMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{27}
+	return fileDescriptor_ed7f10298fa1d90f, []int{29}
 }
 func (m *FdMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_FdMessage.Unmarshal(m, b)
@@ -1608,7 +1721,7 @@ func (m *ResizeMessage) Reset()         { *m = ResizeMessage{} }
 func (m *ResizeMessage) String() string { return proto.CompactTextString(m) }
 func (*ResizeMessage) ProtoMessage()    {}
 func (*ResizeMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{28}
+	return fileDescriptor_ed7f10298fa1d90f, []int{30}
 }
 func (m *ResizeMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ResizeMessage.Unmarshal(m, b)
@@ -1655,7 +1768,7 @@ func (m *SignalMessage) Reset()         { *m = SignalMessage{} }
 func (m *SignalMessage) String() string { return proto.CompactTextString(m) }
 func (*SignalMessage) ProtoMessage()    {}
 func (*SignalMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{29}
+	return fileDescriptor_ed7f10298fa1d90f, []int{31}
 }
 func (m *SignalMessage) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SignalMessage.Unmarshal(m, b)
@@ -1693,7 +1806,7 @@ func (m *StatusRequest) Reset()         { *m = StatusRequest{} }
 func (m *StatusRequest) String() string { return proto.CompactTextString(m) }
 func (*StatusRequest) ProtoMessage()    {}
 func (*StatusRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{30}
+	return fileDescriptor_ed7f10298fa1d90f, []int{32}
 }
 func (m *StatusRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_StatusRequest.Unmarshal(m, b)
@@ -1734,7 +1847,7 @@ func (m *StatusResponse) Reset()         { *m = StatusResponse{} }
 func (m *StatusResponse) String() string { return proto.CompactTextString(m) }
 func (*StatusResponse) ProtoMessage()    {}
 func (*StatusResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{31}
+	return fileDescriptor_ed7f10298fa1d90f, []int{33}
 }
 func (m *StatusResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_StatusResponse.Unmarshal(m, b)
@@ -1792,7 +1905,7 @@ func (m *InfoRequest) Reset()         { *m = InfoRequest{} }
 func (m *InfoRequest) String() string { return proto.CompactTextString(m) }
 func (*InfoRequest) ProtoMessage()    {}
 func (*InfoRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{32}
+	return fileDescriptor_ed7f10298fa1d90f, []int{34}
 }
 func (m *InfoRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InfoRequest.Unmarshal(m, b)
@@ -1823,7 +1936,7 @@ func (m *InfoResponse) Reset()         { *m = InfoResponse{} }
 func (m *InfoResponse) String() string { return proto.CompactTextString(m) }
 func (*InfoResponse) ProtoMessage()    {}
 func (*InfoResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{33}
+	return fileDescriptor_ed7f10298fa1d90f, []int{35}
 }
 func (m *InfoResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InfoResponse.Unmarshal(m, b)
@@ -1863,7 +1976,7 @@ func (m *BuildxVersion) Reset()         { *m = BuildxVersion{} }
 func (m *BuildxVersion) String() string { return proto.CompactTextString(m) }
 func (*BuildxVersion) ProtoMessage()    {}
 func (*BuildxVersion) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ed7f10298fa1d90f, []int{34}
+	return fileDescriptor_ed7f10298fa1d90f, []int{36}
 }
 func (m *BuildxVersion) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_BuildxVersion.Unmarshal(m, b)
@@ -1911,10 +2024,11 @@ func init() {
 	proto.RegisterType((*DisconnectProcessRequest)(nil), "buildx.controller.v1.DisconnectProcessRequest")
 	proto.RegisterType((*DisconnectProcessResponse)(nil), "buildx.controller.v1.DisconnectProcessResponse")
 	proto.RegisterType((*BuildRequest)(nil), "buildx.controller.v1.BuildRequest")
+	proto.RegisterType((*Inputs)(nil), "buildx.controller.v1.Inputs")
+	proto.RegisterMapType((map[string]*NamedContext)(nil), "buildx.controller.v1.Inputs.NamedContextsEntry")
 	proto.RegisterType((*BuildOptions)(nil), "buildx.controller.v1.BuildOptions")
 	proto.RegisterMapType((map[string]string)(nil), "buildx.controller.v1.BuildOptions.BuildArgsEntry")
 	proto.RegisterMapType((map[string]string)(nil), "buildx.controller.v1.BuildOptions.LabelsEntry")
-	proto.RegisterMapType((map[string]string)(nil), "buildx.controller.v1.BuildOptions.NamedContextsEntry")
 	proto.RegisterType((*ExportEntry)(nil), "buildx.controller.v1.ExportEntry")
 	proto.RegisterMapType((map[string]string)(nil), "buildx.controller.v1.ExportEntry.AttrsEntry")
 	proto.RegisterType((*CacheOptionsEntry)(nil), "buildx.controller.v1.CacheOptionsEntry")
@@ -1922,6 +2036,7 @@ func init() {
 	proto.RegisterType((*Attest)(nil), "buildx.controller.v1.Attest")
 	proto.RegisterType((*SSH)(nil), "buildx.controller.v1.SSH")
 	proto.RegisterType((*Secret)(nil), "buildx.controller.v1.Secret")
+	proto.RegisterType((*NamedContext)(nil), "buildx.controller.v1.NamedContext")
 	proto.RegisterType((*UlimitOpt)(nil), "buildx.controller.v1.UlimitOpt")
 	proto.RegisterMapType((map[string]*Ulimit)(nil), "buildx.controller.v1.UlimitOpt.ValuesEntry")
 	proto.RegisterType((*Ulimit)(nil), "buildx.controller.v1.Ulimit")
@@ -1952,119 +2067,127 @@ func init() {
 func init() { proto.RegisterFile("controller.proto", fileDescriptor_ed7f10298fa1d90f) }
 
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+	0x62, 0xda, 0xd7, 0x50, 0x4f, 0x68, 0xc1, 0x9c, 0x71, 0xd6, 0x41, 0x40, 0x95, 0xaa, 0xa1, 0xb2,
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+	0x25, 0x56, 0xf1, 0x22, 0x65, 0xf7, 0x93, 0x2c, 0xbb, 0x17, 0x4d, 0xfe, 0x05, 0x94, 0x66, 0x77,
+	0x24, 0xb3, 0x7c, 0x77, 0xfa, 0x09, 0x1a, 0x5e, 0x9f, 0x5f, 0x41, 0x99, 0x32, 0xa1, 0x5a, 0x8d,
+	0x62, 0x5e, 0xfd, 0xd6, 0x98, 0x39, 0xd9, 0x90, 0x14, 0xfd, 0xc2, 0x1b, 0x06, 0xae, 0x6f, 0xde,
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+	0xa8, 0xfb, 0x14, 0x72, 0x2f, 0x90, 0x26, 0x64, 0x13, 0x12, 0xb5, 0xd1, 0xbd, 0x71, 0xdf, 0x14,
+	0x1c, 0x35, 0x9c, 0x17, 0x8e, 0xa2, 0x29, 0x1c, 0x2a, 0x08, 0xde, 0x09, 0x16, 0xa1, 0x8b, 0x6a,
+	0x14, 0xc7, 0x2a, 0x91, 0x9c, 0x72, 0x94, 0xea, 0x24, 0x64, 0x66, 0xa8, 0xef, 0x4a, 0x67, 0x1e,
+	0xa5, 0xef, 0x0a, 0x2b, 0xe0, 0x29, 0x57, 0x32, 0x9d, 0x71, 0xf4, 0x44, 0xe1, 0xde, 0xca, 0x1b,
+	0xec, 0xc0, 0xab, 0x54, 0x0d, 0x55, 0x31, 0xa3, 0xdc, 0xf7, 0xbb, 0x6e, 0x6f, 0x64, 0xd7, 0x74,
+	0x15, 0x8d, 0xe7, 0xce, 0x0e, 0xd4, 0x66, 0x47, 0xaf, 0xaa, 0x60, 0xa7, 0x8f, 0xae, 0x6d, 0xd0,
+	0x42, 0xa7, 0x1f, 0x47, 0x6d, 0x61, 0x31, 0x6a, 0x8b, 0x89, 0xa8, 0x7d, 0x01, 0x8d, 0x54, 0x10,
+	0x28, 0x10, 0xe5, 0x57, 0xc2, 0x28, 0xc2, 0xb1, 0x92, 0xed, 0x71, 0x5f, 0xbf, 0xb2, 0x1b, 0x14,
+	0xc7, 0xce, 0x53, 0x68, 0xa4, 0x8e, 0x7f, 0x59, 0xf5, 0x70, 0x9e, 0x40, 0xe3, 0x42, 0xba, 0x72,
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+	0xfa, 0x0d, 0x2b, 0xef, 0x0e, 0xee, 0x26, 0xa1, 0x34, 0xcd, 0x74, 0x7e, 0x30, 0xe5, 0x2b, 0x16,
+	0xa8, 0xb2, 0x1a, 0xba, 0xbd, 0x91, 0x3b, 0x8c, 0xcf, 0x29, 0x9e, 0xaa, 0x2f, 0x53, 0xb3, 0x9e,
+	0xbe, 0x86, 0xf1, 0x54, 0x45, 0x60, 0xc4, 0xa6, 0x9e, 0x98, 0x37, 0xbb, 0xb3, 0xf9, 0xf6, 0x5f,
+	0xcb, 0x00, 0x7b, 0xb3, 0xfd, 0x90, 0x73, 0x58, 0xc1, 0xf5, 0x88, 0x93, 0x5b, 0x0c, 0xd1, 0xee,
+	0xe6, 0xd3, 0x7b, 0x14, 0x4c, 0xf2, 0x0e, 0xca, 0xfa, 0xb4, 0x48, 0x56, 0x0e, 0x4a, 0xc6, 0x57,
+	0xf3, 0x59, 0x3e, 0x48, 0x2b, 0xfd, 0xd2, 0x22, 0xd4, 0x64, 0x28, 0xe2, 0xe4, 0x94, 0x20, 0x13,
+	0xd9, 0x59, 0x1b, 0x4d, 0x65, 0xfb, 0x2d, 0x8b, 0x7c, 0x07, 0x65, 0x9d, 0x63, 0xc8, 0x4f, 0x97,
+	0x13, 0x62, 0x7d, 0xf9, 0x9f, 0xb7, 0xac, 0x2f, 0x2d, 0x72, 0x02, 0x25, 0x55, 0x5c, 0x49, 0x46,
+	0xa5, 0x48, 0x54, 0xe6, 0xa6, 0x93, 0x07, 0x31, 0x5e, 0xfc, 0x01, 0x60, 0x5e, 0xe2, 0x49, 0xc6,
+	0x3f, 0x04, 0x0b, 0xbd, 0x42, 0x73, 0xeb, 0x6e, 0xa0, 0x59, 0xe0, 0x44, 0xd5, 0xb7, 0x01, 0x27,
+	0x99, 0x95, 0x6d, 0x16, 0xee, 0x4d, 0x27, 0x0f, 0x62, 0xd4, 0x5d, 0x42, 0x23, 0xf5, 0x5f, 0x29,
+	0xf9, 0x3c, 0xdb, 0xc8, 0xdb, 0x7f, 0xbd, 0x36, 0x9f, 0xdf, 0x0b, 0x6b, 0x56, 0x92, 0xc9, 0x1e,
+	0xc9, 0x7c, 0x26, 0xad, 0xbb, 0xec, 0x4e, 0xff, 0xef, 0xd9, 0x6c, 0xdf, 0x1b, 0xaf, 0x57, 0xdd,
+	0x2d, 0xfd, 0xa6, 0x10, 0x76, 0xbb, 0x65, 0xfc, 0x0b, 0xf9, 0xeb, 0xff, 0x06, 0x00, 0x00, 0xff,
+	0xff, 0x6f, 0xa9, 0xd4, 0x1e, 0xd7, 0x16, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/controller/pb/controller.proto b/controller/pb/controller.proto
index 944bbc26..518a4bf0 100644
--- a/controller/pb/controller.proto
+++ b/controller/pb/controller.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package buildx.controller.v1;
 
 import "github.com/moby/buildkit/api/services/control/control.proto";
+import "github.com/moby/buildkit/solver/pb/ops.proto";
 
 option go_package = "pb";
 
@@ -44,32 +45,39 @@ message BuildRequest {
   BuildOptions Options = 2;
 }
 
-message BuildOptions {
+message Inputs {
   string ContextPath = 1;
   string DockerfileName = 2;
-  string PrintFunc = 3;
-  map<string, string> NamedContexts = 4;
-
-  repeated string Allow = 5;
-  repeated Attest Attests = 6;
-  map<string, string> BuildArgs = 7;
-  repeated CacheOptionsEntry CacheFrom = 8;
-  repeated CacheOptionsEntry CacheTo = 9;
-  string CgroupParent = 10;
-  repeated ExportEntry Exports = 11;
-  repeated string ExtraHosts = 12;
-  map<string, string> Labels = 13;
-  string NetworkMode = 14;
-  repeated string NoCacheFilter = 15;
-  repeated string Platforms = 16;
-  repeated Secret Secrets = 17;
-  int64 ShmSize = 18;
-  repeated SSH SSH = 19;
-  repeated string Tags = 20;
-  string Target = 21;
-  UlimitOpt Ulimits = 22;
-
-  CommonOptions Opts = 24;
+  string DockerfileInline = 3;
+  pb.Definition ContextDefinition = 4;
+  map<string, NamedContext> NamedContexts = 5;
+  // io.Reader InStream = ???;
+}
+
+message BuildOptions {
+  Inputs inputs = 1;
+  string PrintFunc = 2;
+
+  repeated string Allow = 3;
+  repeated Attest Attests = 4;
+  map<string, string> BuildArgs = 5;
+  repeated CacheOptionsEntry CacheFrom = 6;
+  repeated CacheOptionsEntry CacheTo = 7;
+  string CgroupParent = 8;
+  repeated ExportEntry Exports = 9;
+  repeated string ExtraHosts = 10;
+  map<string, string> Labels = 11;
+  string NetworkMode = 12;
+  repeated string NoCacheFilter = 13;
+  repeated string Platforms = 14;
+  repeated Secret Secrets = 15;
+  int64 ShmSize = 16;
+  repeated SSH SSH = 17;
+  repeated string Tags = 18;
+  string Target = 19;
+  UlimitOpt Ulimits = 20;
+
+  CommonOptions Opts = 21;
 }
 
 message ExportEntry {
@@ -100,6 +108,11 @@ message Secret {
   string Env = 3;
 }
 
+message NamedContext {
+  string Path = 1;
+  pb.Definition Definition = 2;
+}
+
 message UlimitOpt {
   map<string, Ulimit> values = 1;
 }
@@ -118,6 +131,11 @@ message CommonOptions {
   bool Pull = 4;
   bool ExportPush = 5;
   bool ExportLoad = 6;
+  // TODO: we should remove Linked from the controllerapi, it's only used to
+  // produce a single warning. To allow this, we need to move the default
+  // export detection out from the controller server, as well as load the
+  // driver on the controller client.
+  bool Linked = 7;
 }
 
 message BuildResponse {
diff --git a/util/buildflags/context.go b/util/buildflags/context.go
index e67fb97c..73d8c1c2 100644
--- a/util/buildflags/context.go
+++ b/util/buildflags/context.go
@@ -3,15 +3,16 @@ package buildflags
 import (
 	"strings"
 
+	controllerapi "github.com/docker/buildx/controller/pb"
 	"github.com/docker/distribution/reference"
 	"github.com/pkg/errors"
 )
 
-func ParseContextNames(values []string) (map[string]string, error) {
+func ParseContextNames(values []string) (map[string]*controllerapi.NamedContext, error) {
 	if len(values) == 0 {
 		return nil, nil
 	}
-	result := make(map[string]string, len(values))
+	result := make(map[string]*controllerapi.NamedContext, len(values))
 	for _, value := range values {
 		kv := strings.SplitN(value, "=", 2)
 		if len(kv) != 2 {
@@ -22,7 +23,7 @@ func ParseContextNames(values []string) (map[string]string, error) {
 			return nil, errors.Wrapf(err, "invalid context name %s", kv[0])
 		}
 		name := strings.TrimSuffix(reference.FamiliarString(named), ":latest")
-		result[name] = kv[1]
+		result[name] = &controllerapi.NamedContext{Path: kv[1]}
 	}
 	return result, nil
 }