worker: add platforms support

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

api/services/control/control.pb.go

@@ -544,6 +544,7 @@ func (m *ListWorkersResponse) GetRecord() []*WorkerRecord {
 type WorkerRecord struct {
 	ID        string            `protobuf:"bytes,1,opt,name=ID,proto3" json:"ID,omitempty"`
 	Labels    map[string]string `protobuf:"bytes,2,rep,name=Labels" json:"Labels,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Platforms []pb.Platform     `protobuf:"bytes,3,rep,name=platforms" json:"platforms"`
 }
 
 func (m *WorkerRecord) Reset()                    { *m = WorkerRecord{} }
@@ -565,6 +566,13 @@ func (m *WorkerRecord) GetLabels() map[string]string {
 	return nil
 }
 
+func (m *WorkerRecord) GetPlatforms() []pb.Platform {
+	if m != nil {
+		return m.Platforms
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*PruneRequest)(nil), "moby.buildkit.v1.PruneRequest")
 	proto.RegisterType((*DiskUsageRequest)(nil), "moby.buildkit.v1.DiskUsageRequest")
@@ -1650,6 +1658,18 @@ func (m *WorkerRecord) MarshalTo(dAtA []byte) (int, error) {
 			i += copy(dAtA[i:], v)
 		}
 	}
+	if len(m.Platforms) > 0 {
+		for _, msg := range m.Platforms {
+			dAtA[i] = 0x1a
+			i++
+			i = encodeVarintControl(dAtA, i, uint64(msg.Size()))
+			n, err := msg.MarshalTo(dAtA[i:])
+			if err != nil {
+				return 0, err
+			}
+			i += n
+		}
+	}
 	return i, nil
 }
 
@@ -1979,6 +1999,12 @@ func (m *WorkerRecord) Size() (n int) {
 			n += mapEntrySize + 1 + sovControl(uint64(mapEntrySize))
 		}
 	}
+	if len(m.Platforms) > 0 {
+		for _, e := range m.Platforms {
+			l = e.Size()
+			n += 1 + l + sovControl(uint64(l))
+		}
+	}
 	return n
 }
 
@@ -4663,6 +4689,37 @@ func (m *WorkerRecord) Unmarshal(dAtA []byte) error {
 			}
 			m.Labels[mapkey] = mapvalue
 			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Platforms", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowControl
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthControl
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Platforms = append(m.Platforms, pb.Platform{})
+			if err := m.Platforms[len(m.Platforms)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipControl(dAtA[iNdEx:])
@@ -4792,80 +4849,81 @@ var (
 func init() { proto.RegisterFile("control.proto", fileDescriptorControl) }
 
 var fileDescriptorControl = []byte{
-	// 1192 bytes of a gzipped FileDescriptorProto
+	// 1214 bytes of a gzipped FileDescriptorProto
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-	0xc3, 0x1a, 0x54, 0x74, 0x44, 0x62, 0x39, 0x28, 0xc3, 0x28, 0x26, 0x8c, 0x37, 0xfb, 0xf4, 0x9e,
+	0xd7, 0x18, 0x54, 0x24, 0xc5, 0x89, 0x18, 0x94, 0x61, 0x94, 0x60, 0xca, 0x5a, 0x03, 0x72, 0x5f,
-	0x76, 0x09, 0xda, 0xea, 0x0f, 0x36, 0x0c, 0x92, 0x2b, 0x8a, 0x47, 0x89, 0x30, 0x85, 0x79, 0x3b,
+	0x99, 0xf8, 0x1d, 0xf9, 0x13, 0x68, 0x06, 0xc1, 0x15, 0x25, 0xe9, 0x88, 0xeb, 0xc2, 0xbc, 0x1d,
-	0x2e, 0xcd, 0x20, 0x47, 0x44, 0x1c, 0x0e, 0x89, 0xe9, 0x6b, 0xea, 0x2c, 0x47, 0x44, 0x57, 0xd6,
+	0x97, 0x62, 0x10, 0x23, 0x22, 0x09, 0x87, 0x58, 0xf7, 0x35, 0x79, 0x16, 0x23, 0xa2, 0x27, 0xea,
-	0x6d, 0x4f, 0x0d, 0x8e, 0x32, 0x36, 0x16, 0xda, 0x86, 0x12, 0x17, 0x21, 0x13, 0xa4, 0xa7, 0x5a,
+	0xb6, 0x2f, 0x07, 0x47, 0x35, 0xd0, 0x12, 0xda, 0x82, 0x0a, 0xe3, 0x21, 0xe5, 0xb8, 0x2f, 0x5b,
-	0xd2, 0x4d, 0x7a, 0x7b, 0xea, 0x80, 0x1e, 0x42, 0xa5, 0x4b, 0x87, 0xa3, 0x01, 0x91, 0xde, 0xc5,
+	0xd2, 0x4d, 0x7a, 0x7b, 0x66, 0x80, 0x1e, 0x81, 0xdd, 0x23, 0xc3, 0x34, 0xc6, 0xc2, 0xba, 0x7c,
-	0x1b, 0x7a, 0x4f, 0x5c, 0x64, 0xf5, 0x10, 0xc6, 0x28, 0x53, 0x53, 0xa5, 0x82, 0xb5, 0xe1, 0xff,
+	0x43, 0xeb, 0x89, 0x89, 0xa8, 0x1e, 0x4c, 0x29, 0xa1, 0x72, 0xaa, 0xd8, 0x81, 0x12, 0xbc, 0xff,
-	0x97, 0x83, 0x9a, 0x2d, 0x56, 0x66, 0x62, 0xee, 0x41, 0x51, 0x4b, 0xaf, 0xab, 0xee, 0x76, 0xa9,
+	0x0a, 0x50, 0x37, 0x93, 0x95, 0x9b, 0x98, 0xbb, 0x50, 0x56, 0xa9, 0x57, 0x55, 0x77, 0xbb, 0x50,
-	0xd2, 0x0c, 0x73, 0x53, 0xe5, 0x42, 0xa9, 0x9b, 0x30, 0x35, 0x4e, 0xf5, 0x90, 0x4d, 0x4d, 0x19,
+	0x29, 0x86, 0xb9, 0xa1, 0x72, 0xa0, 0xd2, 0x1b, 0x51, 0x39, 0x4e, 0xd5, 0x90, 0xcd, 0x44, 0xe1,
-	0xb0, 0xa0, 0x22, 0x1c, 0xa8, 0x54, 0xe5, 0xb1, 0x36, 0xe4, 0x94, 0x1d, 0xaf, 0x2a, 0x8b, 0x4d,
+	0x30, 0x27, 0x3c, 0x8c, 0x65, 0xa8, 0x8a, 0x81, 0x12, 0xc4, 0x94, 0x1d, 0xaf, 0x2a, 0x8b, 0x4d,
-	0xd9, 0xb1, 0x9b, 0x2d, 0x43, 0xe9, 0x8d, 0x64, 0x28, 0x2f, 0x2c, 0x83, 0xff, 0xa7, 0x03, 0x95,
+	0xd9, 0xb1, 0x99, 0x99, 0x86, 0xca, 0x1b, 0xa5, 0xa1, 0xba, 0x70, 0x1a, 0xbc, 0x3f, 0x2c, 0xb0,
-	0x71, 0x95, 0x5b, 0xd9, 0x75, 0xde, 0x38, 0xbb, 0x53, 0x99, 0xc9, 0xdd, 0x2e, 0x33, 0x77, 0xa0,
+	0xc7, 0x55, 0x6e, 0x44, 0xd7, 0x7a, 0xe3, 0xe8, 0x4e, 0x45, 0xa6, 0x70, 0xbb, 0xc8, 0xdc, 0x81,
-	0xc8, 0x05, 0x23, 0xe1, 0x50, 0x69, 0x94, 0xc7, 0xc6, 0x92, 0xfd, 0x64, 0xc8, 0xfb, 0x4a, 0xa1,
+	0x32, 0xe3, 0x14, 0x87, 0x43, 0x99, 0xa3, 0x62, 0xa0, 0x25, 0xd1, 0x4f, 0x86, 0x6c, 0x20, 0x33,
-	0x1a, 0x96, 0x47, 0xdf, 0x87, 0x5a, 0xeb, 0x4c, 0x10, 0x7e, 0x40, 0xb8, 0x5c, 0x2e, 0xa4, 0xb6,
+	0x54, 0x0f, 0xc4, 0xd1, 0xf3, 0xa0, 0xde, 0x3e, 0xe3, 0x98, 0xed, 0x63, 0x26, 0x96, 0x0b, 0x91,
-	0xbd, 0x50, 0x84, 0xea, 0x1d, 0x35, 0xac, 0xce, 0xfe, 0x5d, 0x40, 0xfb, 0x11, 0x17, 0xcf, 0x29,
+	0xdb, 0x7e, 0xc8, 0x43, 0x79, 0x8f, 0x7a, 0x20, 0xcf, 0xde, 0x3d, 0x40, 0x7b, 0x11, 0xe3, 0xcf,
-	0x3b, 0x21, 0x8c, 0xcf, 0xdb, 0x03, 0xf3, 0xd6, 0x1e, 0x78, 0x00, 0xef, 0x4c, 0xa1, 0x4d, 0x97,
+	0x09, 0x3d, 0xc1, 0x94, 0xcd, 0xdb, 0x03, 0x8b, 0xc6, 0x1e, 0xb8, 0x0f, 0xef, 0x4c, 0xa1, 0x75,
-	0xfa, 0x62, 0x66, 0x13, 0x9c, 0xd3, 0x6d, 0xb4, 0xcb, 0xcc, 0x2a, 0xf8, 0xab, 0x03, 0x35, 0xfb,
+	0x97, 0xfa, 0x62, 0x66, 0x13, 0x9c, 0xd3, 0x6d, 0x94, 0xc9, 0xcc, 0x2a, 0xf8, 0xa7, 0x05, 0x75,
-	0x1f, 0x99, 0xca, 0x6e, 0x41, 0x71, 0x3f, 0xec, 0x90, 0x41, 0xda, 0xc6, 0x36, 0xae, 0x26, 0x0e,
+	0xf3, 0x41, 0xae, 0xb2, 0xdb, 0x50, 0xde, 0x0b, 0xbb, 0x38, 0xce, 0xda, 0xd8, 0xdd, 0xab, 0x89,
-	0x34, 0x58, 0xf7, 0x71, 0xe3, 0xe9, 0x7d, 0x05, 0x55, 0xeb, 0x7a, 0x91, 0x9e, 0xbd, 0xf5, 0x6f,
+	0x7d, 0x05, 0x56, 0x7d, 0x5c, 0x5b, 0xa2, 0x0d, 0xb0, 0xd3, 0x38, 0xe4, 0xc7, 0x84, 0x0e, 0xb3,
-	0x1e, 0x4a, 0x3b, 0x7a, 0xa9, 0x47, 0xcf, 0xa0, 0x32, 0x5e, 0x81, 0x91, 0x9f, 0x8d, 0x63, 0x76,
+	0xae, 0x56, 0x17, 0x7b, 0xd0, 0x81, 0x56, 0xea, 0x31, 0x3e, 0x01, 0xb9, 0x5f, 0x41, 0xcd, 0x20,
-	0x97, 0xf6, 0x3e, 0xbe, 0x12, 0x63, 0x32, 0xf7, 0x0d, 0x2c, 0xa9, 0xa5, 0x1c, 0xcd, 0x49, 0x99,
+	0x5a, 0xa4, 0xcb, 0x6f, 0xfe, 0x5b, 0x84, 0xca, 0xb6, 0xfa, 0x1b, 0x80, 0x9e, 0x81, 0x3d, 0x5e,
-	0xbd, 0xad, 0x7b, 0x57, 0x2f, 0xd7, 0x9b, 0x8e, 0x64, 0x52, 0xd3, 0x6d, 0x1e, 0x93, 0xbd, 0x06,
+	0x9a, 0x91, 0x97, 0xf7, 0x7c, 0x76, 0xfb, 0x76, 0x3f, 0xbe, 0x12, 0xa3, 0x63, 0xfd, 0x0d, 0x2c,
-	0x79, 0xeb, 0xd7, 0x8c, 0x45, 0x74, 0x00, 0x45, 0xd3, 0x68, 0xe6, 0x41, 0xed, 0x19, 0xe6, 0xd5,
+	0xc9, 0x35, 0x1e, 0xcd, 0x09, 0xb2, 0xb9, 0xdf, 0xbb, 0x57, 0xaf, 0xe3, 0x1b, 0x96, 0x60, 0x92,
-	0x2f, 0x07, 0x68, 0xb2, 0x4d, 0x07, 0x1d, 0x8c, 0x77, 0xbc, 0x79, 0xa1, 0xd9, 0x05, 0xea, 0x5d,
+	0xf3, 0x70, 0x1e, 0x93, 0xb9, 0x38, 0xb9, 0xeb, 0xd7, 0x0c, 0x52, 0xb4, 0x0f, 0x65, 0xdd, 0x9a,
-	0xf3, 0xff, 0x86, 0xb3, 0xe9, 0xa0, 0x1f, 0xa0, 0x6a, 0x95, 0x20, 0xfa, 0x24, 0xeb, 0x92, 0xad,
+	0xe6, 0x41, 0xcd, 0xa9, 0xe7, 0x36, 0x2e, 0x07, 0x28, 0xb2, 0x0d, 0x0b, 0xed, 0x8f, 0xb7, 0xc2,
-	0x67, 0xef, 0xd3, 0x6b, 0x50, 0x3a, 0xd8, 0x56, 0xed, 0xd5, 0xc5, 0x9a, 0xf3, 0xd7, 0xc5, 0x9a,
+	0x79, 0xae, 0x99, 0x25, 0xed, 0x5e, 0xf3, 0xbc, 0x69, 0x6d, 0x58, 0xe8, 0x07, 0xa8, 0x19, 0x45,
-	0xf3, 0xcf, 0xc5, 0x9a, 0xd3, 0x29, 0xaa, 0x5f, 0xe4, 0x67, 0xff, 0x07, 0x00, 0x00, 0xff, 0xff,
+	0x8b, 0x3e, 0xc9, 0x9b, 0xe4, 0xbf, 0x00, 0xf7, 0xd3, 0x6b, 0x50, 0xca, 0xd9, 0x76, 0xfd, 0xd5,
-	0x4d, 0x94, 0x5a, 0xb6, 0xd8, 0x0d, 0x00, 0x00,
+	0xc5, 0x9a, 0xf5, 0xd7, 0xc5, 0x9a, 0xf5, 0xcf, 0xc5, 0x9a, 0xd5, 0x2d, 0xcb, 0x6f, 0xf8, 0xb3,
+	0xff, 0x03, 0x00, 0x00, 0xff, 0xff, 0x86, 0xd4, 0x0f, 0xa1, 0x0a, 0x0e, 0x00, 0x00,
 }

api/services/control/control.proto

@@ -118,4 +118,5 @@ message ListWorkersResponse {
 message WorkerRecord {
 	string ID = 1;
 	map<string, string> Labels = 2;
+	repeated pb.Platform platforms = 3 [(gogoproto.nullable) = false];
 }

client/workers.go

@@ -4,12 +4,15 @@ import (
 	"context"
 
 	controlapi "github.com/moby/buildkit/api/services/control"
+	"github.com/moby/buildkit/solver/pb"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 )
 
 type WorkerInfo struct {
 	ID        string
 	Labels    map[string]string
+	Platforms []specs.Platform
 }
 
 func (c *Client) ListWorkers(ctx context.Context, opts ...ListWorkersOption) ([]*WorkerInfo, error) {
@@ -30,6 +33,7 @@ func (c *Client) ListWorkers(ctx context.Context, opts ...ListWorkersOption) ([]
 		wi = append(wi, &WorkerInfo{
 			ID:        w.ID,
 			Labels:    w.Labels,
+			Platforms: toClientPlatforms(w.Platforms),
 		})
 	}
 
@@ -47,3 +51,17 @@ func WithWorkerFilter(f []string) ListWorkersOption {
 		wi.Filter = f
 	}
 }
+
+func toClientPlatforms(p []pb.Platform) []specs.Platform {
+	out := make([]specs.Platform, 0, len(p))
+	for _, pp := range p {
+		out = append(out, specs.Platform{
+			OS:           pp.OS,
+			Architecture: pp.Architecture,
+			Variant:      pp.Variant,
+			OSVersion:    pp.OSVersion,
+			OSFeatures:   pp.OSFeatures,
+		})
+	}
+	return out
+}

cmd/buildctl/debug/workers.go

@@ -5,9 +5,12 @@ import (
 	"fmt"
 	"os"
 	"sort"
+	"strings"
 	"text/tabwriter"
 
+	"github.com/containerd/containerd/platforms"
 	"github.com/moby/buildkit/client"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/urfave/cli"
 )
 
@@ -54,6 +57,7 @@ func listWorkers(clicontext *cli.Context) error {
 func printWorkersVerbose(tw *tabwriter.Writer, winfo []*client.WorkerInfo) {
 	for _, wi := range winfo {
 		fmt.Fprintf(tw, "ID:\t%s\n", wi.ID)
+		fmt.Fprintf(tw, "Platforms:\t%s\n", joinPlatforms(wi.Platforms))
 		fmt.Fprintf(tw, "Labels:\n")
 		for _, k := range sortedKeys(wi.Labels) {
 			v := wi.Labels[k]
@@ -66,11 +70,11 @@ func printWorkersVerbose(tw *tabwriter.Writer, winfo []*client.WorkerInfo) {
 }
 
 func printWorkersTable(tw *tabwriter.Writer, winfo []*client.WorkerInfo) {
-	fmt.Fprintln(tw, "ID")
+	fmt.Fprintln(tw, "ID\tPLATFORMS")
 
 	for _, wi := range winfo {
 		id := wi.ID
-		fmt.Fprintf(tw, "%s\n", id)
+		fmt.Fprintf(tw, "%s\t%s\n", id, joinPlatforms(wi.Platforms))
 	}
 
 	tw.Flush()
@@ -90,3 +94,11 @@ func sortedKeys(m map[string]string) []string {
 func commandContext(c *cli.Context) context.Context {
 	return c.App.Metadata["context"].(context.Context)
 }
+
+func joinPlatforms(p []specs.Platform) string {
+	str := make([]string, 0, len(p))
+	for _, pp := range p {
+		str = append(str, platforms.Format(platforms.Normalize(pp)))
+	}
+	return strings.Join(str, ",")
+}

cmd/buildkitd/main_oci_worker.go

@@ -5,12 +5,14 @@ package main
 import (
 	"os/exec"
 
+	"github.com/containerd/containerd/platforms"
 	ctdsnapshot "github.com/containerd/containerd/snapshots"
 	"github.com/containerd/containerd/snapshots/native"
 	"github.com/containerd/containerd/snapshots/overlay"
 	"github.com/moby/buildkit/worker"
 	"github.com/moby/buildkit/worker/base"
 	"github.com/moby/buildkit/worker/runc"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
@@ -32,6 +34,10 @@ func init() {
 			Usage: "name of snapshotter (overlayfs or native)",
 			Value: "auto",
 		},
+		cli.StringSliceFlag{
+			Name:  "oci-worker-platform",
+			Usage: "override supported platforms for worker",
+		},
 	}
 	n := "oci-worker-rootless"
 	u := "enable rootless mode"
@@ -82,6 +88,14 @@ func ociWorkerInitializer(c *cli.Context, common workerInitializerOpt) ([]worker
 		return nil, err
 	}
 	opt.SessionManager = common.sessionManager
+	platformsStr := c.GlobalStringSlice("oci-worker-platform")
+	if len(platformsStr) != 0 {
+		platforms, err := parsePlatforms(platformsStr)
+		if err != nil {
+			return nil, errors.Wrap(err, "invalid platforms")
+		}
+		opt.Platforms = platforms
+	}
 	w, err := base.NewWorker(opt)
 	if err != nil {
 		return nil, err
@@ -89,6 +103,18 @@ func ociWorkerInitializer(c *cli.Context, common workerInitializerOpt) ([]worker
 	return []worker.Worker{w}, nil
 }
 
+func parsePlatforms(platformsStr []string) ([]specs.Platform, error) {
+	out := make([]specs.Platform, 0, len(platformsStr))
+	for _, s := range platformsStr {
+		p, err := platforms.Parse(s)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, platforms.Normalize(p))
+	}
+	return out, nil
+}
+
 func snapshotterFactory(commonRoot, name string) (runc.SnapshotterFactory, error) {
 	if name == "auto" {
 		if err := overlay.Supported(commonRoot); err == nil {

control/control.go

@@ -13,7 +13,9 @@ import (
 	"github.com/moby/buildkit/session/grpchijack"
 	"github.com/moby/buildkit/solver"
 	"github.com/moby/buildkit/solver/llbsolver"
+	"github.com/moby/buildkit/solver/pb"
 	"github.com/moby/buildkit/worker"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sync/errgroup"
@@ -267,6 +269,7 @@ func (c *Controller) ListWorkers(ctx context.Context, r *controlapi.ListWorkersR
 		resp.Record = append(resp.Record, &controlapi.WorkerRecord{
 			ID:        w.ID(),
 			Labels:    w.Labels(),
+			Platforms: toPBPlatforms(w.Platforms()),
 		})
 	}
 	return resp, nil
@@ -290,3 +293,17 @@ func parseCacheExporterOpt(opt map[string]string) solver.CacheExportMode {
 	}
 	return solver.CacheExportModeMin
 }
+
+func toPBPlatforms(p []specs.Platform) []pb.Platform {
+	out := make([]pb.Platform, 0, len(p))
+	for _, pp := range p {
+		out = append(out, pb.Platform{
+			OS:           pp.OS,
+			Architecture: pp.Architecture,
+			Variant:      pp.Variant,
+			OSVersion:    pp.OSVersion,
+			OSFeatures:   pp.OSFeatures,
+		})
+	}
+	return out
+}

worker/base/worker.go

@@ -43,6 +43,7 @@ import (
 	digest "github.com/opencontainers/go-digest"
 	ociidentity "github.com/opencontainers/image-spec/identity"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"golang.org/x/sync/errgroup"
 )
@@ -56,6 +57,7 @@ const labelCreatedAt = "buildkit/createdat"
 type WorkerOpt struct {
 	ID             string
 	Labels         map[string]string
+	Platforms      []specs.Platform
 	SessionManager *session.Manager
 	MetadataStore  *metadata.Store
 	Executor       executor.Executor
@@ -201,6 +203,10 @@ func (w *Worker) Labels() map[string]string {
 	return w.WorkerOpt.Labels
 }
 
+func (w *Worker) Platforms() []specs.Platform {
+	return w.WorkerOpt.Platforms
+}
+
 func (w *Worker) LoadRef(id string) (cache.ImmutableRef, error) {
 	return w.CacheManager.Get(context.TODO(), id)
 }

worker/containerd/containerd.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/containerd/containerd"
+	introspection "github.com/containerd/containerd/api/services/introspection/v1"
 	"github.com/containerd/containerd/namespaces"
 	"github.com/containerd/containerd/snapshots"
 	"github.com/moby/buildkit/cache/metadata"
@@ -16,6 +17,7 @@ import (
 	containerdsnapshot "github.com/moby/buildkit/snapshot/containerd"
 	"github.com/moby/buildkit/util/throttle"
 	"github.com/moby/buildkit/worker/base"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -81,6 +83,25 @@ func newContainerd(root string, client *containerd.Client, snapshotterName strin
 
 	cs := containerdsnapshot.NewContentStore(client.ContentStore(), "buildkit", gc)
 
+	resp, err := client.IntrospectionService().Plugins(context.TODO(), &introspection.PluginsRequest{Filters: []string{"type==io.containerd.runtime.v1"}})
+	if err != nil {
+		return base.WorkerOpt{}, errors.Wrap(err, "failed to list runtime plugin")
+	}
+	if len(resp.Plugins) == 0 {
+		return base.WorkerOpt{}, errors.Wrap(err, "failed to get runtime plugin")
+	}
+
+	var platforms []specs.Platform
+	for _, plugin := range resp.Plugins {
+		for _, p := range plugin.Platforms {
+			platforms = append(platforms, specs.Platform{
+				OS:           p.OS,
+				Architecture: p.Architecture,
+				Variant:      p.Variant,
+			})
+		}
+	}
+
 	opt := base.WorkerOpt{
 		ID:            id,
 		Labels:        xlabels,
@@ -91,6 +112,7 @@ func newContainerd(root string, client *containerd.Client, snapshotterName strin
 		Applier:       df,
 		Differ:        df,
 		ImageStore:    client.ImageService(),
+		Platforms:     platforms,
 	}
 	return opt, nil
 }

worker/runc/runc.go

@@ -11,12 +11,14 @@ import (
 	"github.com/containerd/containerd/diff/apply"
 	"github.com/containerd/containerd/diff/walking"
 	ctdmetadata "github.com/containerd/containerd/metadata"
+	"github.com/containerd/containerd/platforms"
 	ctdsnapshot "github.com/containerd/containerd/snapshots"
 	"github.com/moby/buildkit/cache/metadata"
 	"github.com/moby/buildkit/executor/runcexecutor"
 	containerdsnapshot "github.com/moby/buildkit/snapshot/containerd"
 	"github.com/moby/buildkit/util/throttle"
 	"github.com/moby/buildkit/worker/base"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/sirupsen/logrus"
 )
 
@@ -102,6 +104,7 @@ func NewWorkerOpt(root string, snFactory SnapshotterFactory, rootless bool, labe
 		Applier:       apply.NewFileSystemApplier(c),
 		Differ:        walking.NewWalkingDiff(c),
 		ImageStore:    nil, // explicitly
+		Platforms:     []specs.Platform{platforms.Normalize(platforms.DefaultSpec())},
 	}
 	return opt, nil
 }

worker/worker.go

@@ -11,12 +11,14 @@ import (
 	"github.com/moby/buildkit/frontend"
 	"github.com/moby/buildkit/solver"
 	digest "github.com/opencontainers/go-digest"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
 type Worker interface {
 	// ID needs to be unique in the cluster
 	ID() string
 	Labels() map[string]string
+	Platforms() []specs.Platform
 	LoadRef(id string) (cache.ImmutableRef, error)
 	// ResolveOp resolves Vertex.Sys() to Op implementation.
 	ResolveOp(v solver.Vertex, s frontend.FrontendLLBBridge) (solver.Op, error)