Revert "proto: move all protos under a single root"

This reverts commit 352c6b590c.

api/registry/gen.go

@@ -0,0 +1,3 @@
+package registry
+
+//go:generate protoc -I.:../../../../../github.com/gogo/protobuf --gogoctrd_out=plugins=grpc,import_path=github.com/docker/containerd/api/registry,Mgogoproto/gogo.proto=github.com/gogo/protobuf/gogoproto,Mgoogle/protobuf/descriptor.proto=github.com/gogo/protobuf/protoc-gen-gogo/descriptor:. registry.proto

api/registry/registry.proto

@@ -0,0 +1,53 @@
+syntax = "proto3";
+
+package containerd.v1;
+
+import "gogoproto/gogo.proto";
+
+service Registry {
+	// Pull an image from a registry
+	rpc Pull(PullRequest) returns (PullResponse);
+	// Push pushes a new or existing image to a registry
+	rpc Push(PushRequest) returns (PushResponse);
+	// Delete deletes an image from the registry
+	rpc Delete(DeleteRequest) returns (DeleteResponse);
+
+	// Status returns a progress stream of the push or pull operation
+	rpc Status(StatusRequest) returns (stream StatusResponse);
+	// Cancel cancels a push or pull operation
+	rpc Cancel(CancelRequest) returns (CancelResponse);
+}
+
+message PullRequest {
+	string uri = 1;
+	Authentication auth = 2;
+}
+
+message PullResponse {
+	string id = 1 [(gogoproto.customname) = "ID"];
+	repeated Layer layers = 2;
+}
+
+message PushRequest {}
+message PushResponse {}
+
+message StatusRequest {}
+message StatusResponse {}
+
+message DeleteRequest {}
+message DeleteResponse {}
+
+message CancelRequest{}
+message CancelResponse{}
+
+message Layer {
+	string id = 1 [(gogoproto.customname) = "ID"];
+	uint64 size = 2;
+}
+
+// TODO: we have no clue what should go here, halp stevvooo
+message Authentication {
+	string username = 1;
+	string password = 2;
+}
+