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, 90 insertions, 0 deletions

diff --git a/vendor/github.com/containerd/cgroups/devices.go b/vendor/github.com/containerd/cgroups/devices.go
new file mode 100644
index 000000000..f9a118b22
--- /dev/null
+++ b/vendor/github.com/containerd/cgroups/devices.go
@@ -0,0 +1,90 @@
+/*
+   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.
+*/
+
+package cgroups
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+const (
+	allowDeviceFile = "devices.allow"
+	denyDeviceFile  = "devices.deny"
+	wildcard        = -1
+)
+
+func NewDevices(root string) *devicesController {
+	return &devicesController{
+		root: filepath.Join(root, string(Devices)),
+	}
+}
+
+type devicesController struct {
+	root string
+}
+
+func (d *devicesController) Name() Name {
+	return Devices
+}
+
+func (d *devicesController) Path(path string) string {
+	return filepath.Join(d.root, path)
+}
+
+func (d *devicesController) Create(path string, resources *specs.LinuxResources) error {
+	if err := os.MkdirAll(d.Path(path), defaultDirPerm); err != nil {
+		return err
+	}
+	for _, device := range resources.Devices {
+		file := denyDeviceFile
+		if device.Allow {
+			file = allowDeviceFile
+		}
+		if err := ioutil.WriteFile(
+			filepath.Join(d.Path(path), file),
+			[]byte(deviceString(device)),
+			defaultFilePerm,
+		); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (d *devicesController) Update(path string, resources *specs.LinuxResources) error {
+	return d.Create(path, resources)
+}
+
+func deviceString(device specs.LinuxDeviceCgroup) string {
+	return fmt.Sprintf("%s %s:%s %s",
+		device.Type,
+		deviceNumber(device.Major),
+		deviceNumber(device.Minor),
+		device.Access,
+	)
+}
+
+func deviceNumber(number *int64) string {
+	if number == nil || *number == wildcard {
+		return "*"
+	}
+	return fmt.Sprint(*number)
+}