fix ctr image export not found error

Signed-off-by: Jie Zhang <iamkadisi@163.com>

images/oci/exporter.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/images"
+	"github.com/containerd/containerd/platforms"
 	ocispecs "github.com/opencontainers/image-spec/specs-go"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
@@ -37,6 +38,36 @@ import (
 //                    e.g. application/vnd.docker.image.rootfs.diff.tar.gzip
 //                         -> application/vnd.oci.image.layer.v1.tar+gzip
 type V1Exporter struct {
+	AllPlatforms bool
+}
+
+// V1ExporterOpt allows to set  additional options to a newly V1Exporter
+type V1ExporterOpt func(c *V1Exporter) error
+
+// DefaultV1Exporter return a default V1Exporter pointer
+func DefaultV1Exporter() *V1Exporter {
+	return &V1Exporter{
+		AllPlatforms: false,
+	}
+}
+
+// ResolveV1ExportOpt return a new V1Exporter with V1ExporterOpt
+func ResolveV1ExportOpt(opts ...V1ExporterOpt) (*V1Exporter, error) {
+	exporter := DefaultV1Exporter()
+	for _, o := range opts {
+		if err := o(exporter); err != nil {
+			return exporter, err
+		}
+	}
+	return exporter, nil
+}
+
+// WithAllPlatforms set V1Exporter`s AllPlatforms option
+func WithAllPlatforms(allPlatforms bool) V1ExporterOpt {
+	return func(c *V1Exporter) error {
+		c.AllPlatforms = allPlatforms
+		return nil
+	}
 }
 
 // Export implements Exporter.
@@ -56,8 +87,19 @@ func (oe *V1Exporter) Export(ctx context.Context, store content.Provider, desc o
 		return nil, nil
 	}
 
+	childrenHandler := images.ChildrenHandler(store)
+
+	if !oe.AllPlatforms {
+		// get local default platform to fetch image manifest
+		p, err := platforms.Parse(platforms.DefaultString())
+		if err != nil {
+			return errors.Wrapf(err, "invalid platform %s", platforms.DefaultString())
+		}
+		childrenHandler = images.FilterPlatforms(childrenHandler, platforms.Any(p))
+	}
+
 	handlers := images.Handlers(
-		images.ChildrenHandler(store),
+		childrenHandler,
 		images.HandlerFunc(exportHandler),
 	)