Update go-cni to 891c2a41e18144b2d7921f971d6c9789a68046b2.

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

vendor/github.com/containerd/go-cni/README.md

@@ -47,3 +47,14 @@ func main() {
 	fmt.Printf("IP of the default interface %s:%s", defaultIfName, IP)
 }
 ```
+
+## Project details
+
+The go-cni is a containerd sub-project, licensed under the [Apache 2.0 license](./LICENSE).
+As a containerd sub-project, you will find the:
+
+ * [Project governance](https://github.com/containerd/project/blob/master/GOVERNANCE.md),
+ * [Maintainers](https://github.com/containerd/project/blob/master/MAINTAINERS),
+ * and [Contributing guidelines](https://github.com/containerd/project/blob/master/CONTRIBUTING.md)
+
+information in our [`containerd/project`](https://github.com/containerd/project) repository.

vendor/github.com/containerd/go-cni/cni.go

@@ -22,6 +22,7 @@ import (
 	"sync"
 
 	cnilibrary "github.com/containernetworking/cni/libcni"
+	"github.com/containernetworking/cni/pkg/types"
 	"github.com/containernetworking/cni/pkg/types/current"
 	"github.com/pkg/errors"
 )
@@ -35,6 +36,34 @@ type CNI interface {
 	Load(opts ...CNIOpt) error
 	// Status checks the status of the cni initialization
 	Status() error
+	// GetConfig returns a copy of the CNI plugin configurations as parsed by CNI
+	GetConfig() *ConfigResult
+}
+
+type ConfigResult struct {
+	PluginDirs    []string
+	PluginConfDir string
+	Prefix        string
+	Networks      []*ConfNetwork
+}
+
+type ConfNetwork struct {
+	Config *NetworkConfList
+	IFName string
+}
+
+// NetworkConfList is a source bytes to string version of cnilibrary.NetworkConfigList
+type NetworkConfList struct {
+	Name       string
+	CNIVersion string
+	Plugins    []*NetworkConf
+	Source     string
+}
+
+// NetworkConf is a source bytes to string conversion of cnilibrary.NetworkConfig
+type NetworkConf struct {
+	Network *types.NetConf
+	Source  string
 }
 
 type libcni struct {
@@ -60,6 +89,7 @@ func defaultCNIConfig() *libcni {
 	}
 }
 
+// New creates a new libcni instance.
 func New(config ...CNIOpt) (CNI, error) {
 	cni := defaultCNIConfig()
 	var err error
@@ -71,6 +101,7 @@ func New(config ...CNIOpt) (CNI, error) {
 	return cni, nil
 }
 
+// Load loads the latest config from cni config files.
 func (c *libcni) Load(opts ...CNIOpt) error {
 	var err error
 	c.Lock()
@@ -87,17 +118,27 @@ func (c *libcni) Load(opts ...CNIOpt) error {
 	return nil
 }
 
+// Status returns the status of CNI initialization.
 func (c *libcni) Status() error {
 	c.RLock()
 	defer c.RUnlock()
-	return c.status()
+	if len(c.networks) < c.networkCount {
+		return ErrCNINotInitialized
+	}
+	return nil
+}
+
+// Networks returns all the configured networks.
+// NOTE: Caller MUST NOT modify anything in the returned array.
+func (c *libcni) Networks() []*Network {
+	c.RLock()
+	defer c.RUnlock()
+	return append([]*Network{}, c.networks...)
 }
 
 // Setup setups the network in the namespace
 func (c *libcni) Setup(id string, path string, opts ...NamespaceOpts) (*CNIResult, error) {
-	c.RLock()
-	defer c.RUnlock()
-	if err := c.status(); err != nil {
+	if err := c.Status(); err != nil {
 		return nil, err
 	}
 	ns, err := newNamespace(id, path, opts...)
@@ -105,7 +146,7 @@ func (c *libcni) Setup(id string, path string, opts ...NamespaceOpts) (*CNIResul
 		return nil, err
 	}
 	var results []*current.Result
-	for _, network := range c.networks {
+	for _, network := range c.Networks() {
 		r, err := network.Attach(ns)
 		if err != nil {
 			return nil, err
@@ -117,16 +158,14 @@ func (c *libcni) Setup(id string, path string, opts ...NamespaceOpts) (*CNIResul
 
 // Remove removes the network config from the namespace
 func (c *libcni) Remove(id string, path string, opts ...NamespaceOpts) error {
-	c.RLock()
-	defer c.RUnlock()
-	if err := c.status(); err != nil {
+	if err := c.Status(); err != nil {
 		return err
 	}
 	ns, err := newNamespace(id, path, opts...)
 	if err != nil {
 		return err
 	}
-	for _, network := range c.networks {
+	for _, network := range c.Networks() {
 		if err := network.Remove(ns); err != nil {
 			// Based on CNI spec v0.7.0, empty network namespace is allowed to
 			// do best effort cleanup. However, it is not handled consistently
@@ -143,13 +182,35 @@ func (c *libcni) Remove(id string, path string, opts ...NamespaceOpts) error {
 	return nil
 }
 
+// GetConfig returns a copy of the CNI plugin configurations as parsed by CNI
+func (c *libcni) GetConfig() *ConfigResult {
+	c.RLock()
+	defer c.RUnlock()
+	r := &ConfigResult{
+		PluginDirs:    c.config.pluginDirs,
+		PluginConfDir: c.config.pluginConfDir,
+		Prefix:        c.config.prefix,
+	}
+	for _, network := range c.networks {
+		conf := &NetworkConfList{
+			Name:       network.config.Name,
+			CNIVersion: network.config.CNIVersion,
+			Source:     string(network.config.Bytes),
+		}
+		for _, plugin := range network.config.Plugins {
+			conf.Plugins = append(conf.Plugins, &NetworkConf{
+				Network: plugin.Network,
+				Source:  string(plugin.Bytes),
+			})
+		}
+		r.Networks = append(r.Networks, &ConfNetwork{
+			Config: conf,
+			IFName: network.ifName,
+		})
+	}
+	return r
+}
+
 func (c *libcni) reset() {
 	c.networks = nil
 }
-
-func (c *libcni) status() error {
-	if len(c.networks) < c.networkCount {
-		return ErrCNINotInitialized
-	}
-	return nil
-}

vendor/github.com/containerd/go-cni/errors.go

@@ -1,3 +1,19 @@
+/*
+   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 cni
 
 import (
@@ -13,7 +29,7 @@ var (
 	ErrLoad              = errors.New("failed to load cni config")
 )
 
-// IsCNINotInitialized returns true if the error is due cni config not being intialized
+// IsCNINotInitialized returns true if the error is due to cni config not being initialized
 func IsCNINotInitialized(err error) bool {
 	return errors.Cause(err) == ErrCNINotInitialized
 }

vendor/github.com/containerd/go-cni/opts.go

@@ -55,7 +55,7 @@ func WithPluginConfDir(dir string) CNIOpt {
 }
 
 // WithMinNetworkCount can be used to configure the
-// minimum networks to be configured and initalized
+// minimum networks to be configured and initialized
 // for the status to report success. By default its 1.
 func WithMinNetworkCount(count int) CNIOpt {
 	return func(c *libcni) error {

vendor/github.com/containerd/go-cni/result.go

@@ -54,6 +54,9 @@ type Config struct {
 // c) DNS information. Dictionary that includes DNS information for nameservers,
 // domain, search domains and options.
 func (c *libcni) GetCNIResultFromResults(results []*current.Result) (*CNIResult, error) {
+	c.RLock()
+	defer c.RUnlock()
+
 	r := &CNIResult{
 		Interfaces: make(map[string]*Config),
 	}