Officially deprecate Schema 1

RELEASES.md

@@ -336,10 +336,11 @@ against total impact.
 
 The deprecated features are shown in the following table:
 
-| Component                                                            | Deprecation release | Target release for removal | Recommendation                    |
-|----------------------------------------------------------------------|---------------------|----------------------------|-----------------------------------|
-| Runtime V1 API and implementation (`io.containerd.runtime.v1.linux`) | containerd v1.4     | containerd v2.0            | Use `io.containerd.runc.v2`       |
-| Runc V1 implementation of Runtime V2 (`io.containerd.runc.v1`)       | containerd v1.4     | containerd v2.0            | Use `io.containerd.runc.v2`       |
-| config.toml `version = 1`                                            | containerd v1.5     | containerd v2.0            | Use config.toml `version = 2`     |
-| Built-in `aufs` snapshotter                                          | containerd v1.5     | containerd v2.0            | Use `overlayfs` snapshotter       |
-| `cri-containerd-*.tar.gz` release bundles                            | containerd v1.6     | containerd v2.0            | Use `containerd-*.tar.gz` bundles |
+| Component                                                                        | Deprecation release | Target release for removal | Recommendation                    |
+|----------------------------------------------------------------------------------|---------------------|----------------------------|-----------------------------------|
+| Runtime V1 API and implementation (`io.containerd.runtime.v1.linux`)             | containerd v1.4     | containerd v2.0            | Use `io.containerd.runc.v2`       |
+| Runc V1 implementation of Runtime V2 (`io.containerd.runc.v1`)                   | containerd v1.4     | containerd v2.0            | Use `io.containerd.runc.v2`       |
+| config.toml `version = 1`                                                        | containerd v1.5     | containerd v2.0            | Use config.toml `version = 2`     |
+| Built-in `aufs` snapshotter                                                      | containerd v1.5     | containerd v2.0            | Use `overlayfs` snapshotter       |
+| `cri-containerd-*.tar.gz` release bundles                                        | containerd v1.6     | containerd v2.0            | Use `containerd-*.tar.gz` bundles |
+| Pulling Schema 1 images (`application/vnd.docker.distribution.manifest.v1+json`) | containerd v1.7     | containerd v2.0            | Use Schema 2 or OCI images        |

client.go

@@ -348,6 +348,8 @@ type RemoteContext struct {
 	// ConvertSchema1 is whether to convert Docker registry schema 1
 	// manifests. If this option is false then any image which resolves
 	// to schema 1 will return an error since schema 1 is not supported.
+	//
+	// Deprecated: use Schema 2 or OCI images.
 	ConvertSchema1 bool
 
 	// Platforms defines which platforms to handle when doing the image operation.

client_opts.go

@@ -200,6 +200,8 @@ func WithChildLabelMap(fn func(ocispec.Descriptor) []string) RemoteOpt {
 // WithSchema1Conversion is used to convert Docker registry schema 1
 // manifests to oci manifests on pull. Without this option schema 1
 // manifests will return a not supported error.
+//
+// Deprecated: use Schema 2 or OCI images.
 func WithSchema1Conversion(client *Client, c *RemoteContext) error {
 	c.ConvertSchema1 = true
 	return nil

cmd/ctr/commands/content/fetch.go

@@ -190,7 +190,7 @@ func Fetch(ctx context.Context, client *containerd.Client, ref string, config *F
 		containerd.WithPullLabels(labels),
 		containerd.WithResolver(config.Resolver),
 		containerd.WithImageHandler(h),
-		containerd.WithSchema1Conversion,
+		containerd.WithSchema1Conversion, //nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
 	}
 	opts = append(opts, config.RemoteOpts...)
 

pkg/cri/server/image_pull.go

@@ -127,7 +127,7 @@ func (c *criService) PullImage(ctx context.Context, r *runtime.PullImageRequest)
 	)
 
 	pullOpts := []containerd.RemoteOpt{
-		containerd.WithSchema1Conversion,
+		containerd.WithSchema1Conversion, //nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
 		containerd.WithResolver(resolver),
 		containerd.WithPullSnapshotter(c.config.ContainerdConfig.Snapshotter),
 		containerd.WithPullUnpack,

pull.go

@@ -27,7 +27,7 @@ import (
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/remotes"
 	"github.com/containerd/containerd/remotes/docker"
-	"github.com/containerd/containerd/remotes/docker/schema1"
+	"github.com/containerd/containerd/remotes/docker/schema1" //nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"golang.org/x/sync/semaphore"
 )

remotes/docker/resolver.go

@@ -31,7 +31,7 @@ import (
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/reference"
 	"github.com/containerd/containerd/remotes"
-	"github.com/containerd/containerd/remotes/docker/schema1"
+	"github.com/containerd/containerd/remotes/docker/schema1" //nolint:staticcheck // Ignore SA1019. Need to keep deprecated package for compatibility.
 	remoteerrors "github.com/containerd/containerd/remotes/errors"
 	"github.com/containerd/containerd/version"
 	digest "github.com/opencontainers/go-digest"

remotes/docker/schema1/converter.go

@@ -14,6 +14,9 @@
    limitations under the License.
 */
 
+// Package schema1 provides a converter to fetch an image formatted in Docker Image Manifest v2, Schema 1.
+//
+// Deprecated: use images formatted in Docker Image Manifest v2, Schema 2, or OCI Image Spec v1.
 package schema1
 
 import (