Support transfer to and from container

api/proto/nerdbox/types/transfer/v1/datastream.proto

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+/*
+	Copyright The containerd Authors.
+
+	Licensed under the Apache License, Version 2.0 (the "License");
+	you may not use this file except in compliance with the License.
+	You may obtain a copy of the License at
+
+		http://www.apache.org/licenses/LICENSE-2.0
+
+	Unless required by applicable law or agreed to in writing, software
+	distributed under the License is distributed on an "AS IS" BASIS,
+	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+	See the License for the specific language governing permissions and
+	limitations under the License.
+*/
+
+syntax = "proto3";
+
+package containerd.nerdbox.types.transfer.v1;
+
+option go_package = "github.com/containerd/nerdbox/api/types/transfer/v1;transfer";
+
+// ReadStream carries data from the client to the server (import
+// direction). The client sends data through the stream and the
+// server reads it.
+message ReadStream {
+	string stream = 1;
+	string media_type = 2;
+}
+
+// WriteStream carries data from the server to the client (export
+// direction). The server writes data into the stream and the
+// client receives it.
+message WriteStream {
+	string stream = 1;
+	string media_type = 2;
+}

api/proto/nerdbox/types/transfer/v1/filesystem.proto

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+/*
+	Copyright The containerd Authors.
+
+	Licensed under the Apache License, Version 2.0 (the "License");
+	you may not use this file except in compliance with the License.
+	You may obtain a copy of the License at
+
+		http://www.apache.org/licenses/LICENSE-2.0
+
+	Unless required by applicable law or agreed to in writing, software
+	distributed under the License is distributed on an "AS IS" BASIS,
+	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+	See the License for the specific language governing permissions and
+	limitations under the License.
+*/
+
+syntax = "proto3";
+
+package containerd.nerdbox.types.transfer.v1;
+
+option go_package = "github.com/containerd/nerdbox/api/types/transfer/v1;transfer";
+
+// ContainerFilesystem represents a path within a running container's
+// filesystem. It acts as either a source or destination in a transfer
+// operation, identifying the container and path for archive operations.
+message ContainerFilesystem {
+	string container_id = 1;
+	string path = 2;
+
+	// When true and path is a directory, return only the directory entry
+	// itself without walking into its contents. This is useful for
+	// stat-like operations where only the directory's metadata is needed.
+	bool no_walk = 3;
+
+	// When true, preserve the UID/GID from tar headers when extracting
+	// files. When false, extracted files are owned by the extracting
+	// process.
+	bool preserve_ownership = 4;
+}