Add containerd shim v2 support. (#13)

* Update vendors

Signed-off-by: Lantao Liu <lantaol@google.com>

* Add containerd shim v2 support.

Signed-off-by: Lantao Liu <lantaol@google.com>

* Add test and doc for containerd-shim-runsc-v1.

Signed-off-by: Lantao Liu <lantaol@google.com>

* Address comments.

1 files changed, 50 insertions, 0 deletions

diff --git a/pkg/v1/utils/utils.go b/pkg/v1/utils/utils.go
new file mode 100644
index 000000000..b89edb064
--- /dev/null
+++ b/pkg/v1/utils/utils.go
@@ -0,0 +1,50 @@
+/*
+Copyright 2018 Google LLC
+
+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
+
+    https://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.
+*/
+
+package utils
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/containerd/cri/pkg/annotations"
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+// ReadSpec reads OCI spec from the bundle directory.
+func ReadSpec(bundle string) (*specs.Spec, error) {
+	f, err := os.Open(filepath.Join(bundle, "config.json"))
+	if err != nil {
+		return nil, err
+	}
+	b, err := ioutil.ReadAll(f)
+	if err != nil {
+		return nil, err
+	}
+	var spec specs.Spec
+	if err := json.Unmarshal(b, &spec); err != nil {
+		return nil, err
+	}
+	return &spec, nil
+}
+
+// IsSandbox checks whether a container is a sandbox container.
+func IsSandbox(spec *specs.Spec) bool {
+	t, ok := spec.Annotations[annotations.ContainerType]
+	return !ok || t == annotations.ContainerTypeSandbox
+}