testing: test invocation of newer plugins with an older libcni

diff --git a/version/legacy_examples/example_runtime.go b/version/legacy_examples/example_runtime.go
new file mode 100644 (file)
index 0000000..a461981
--- /dev/null
+++ b/version/legacy_examples/example_runtime.go
@@ -0,0 +1,167 @@
+// Copyright 2016 CNI 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 legacy_examples
+
+// An ExampleRuntime is a small program that uses libcni to invoke a network plugin.
+// It should call ADD and DELETE, verifying all intermediate steps
+// and data structures.
+type ExampleRuntime struct {
+       Example
+       NetConfs []string // The network configuration names to pass
+}
+
+// NetConfs are various versioned network configuration files. Examples should
+// specify which version they expect
+var NetConfs = map[string]string{
+       "unversioned": `{
+       "name": "default",
+       "type": "ptp",
+       "ipam": {
+               "type": "host-local",
+               "subnet": "10.1.2.0/24"
+       }
+}`,
+       "0.1.0": `{
+       "cniVersion": "0.1.0",
+       "name": "default",
+       "type": "ptp",
+       "ipam": {
+               "type": "host-local",
+               "subnet": "10.1.2.0/24"
+       }
+}`,
+}
+
+// V010_Runtime creates a simple ptp network configuration, then
+// executes libcni against the currently-built plugins.
+var V010_Runtime = ExampleRuntime{
+       NetConfs: []string{"unversioned", "0.1.0"},
+       Example: Example{
+               Name:          "example_invoker_v010",
+               CNIRepoGitRef: "c0d34c69", //version with ns.Do
+               PluginSource: `package main
+
+import (
+       "fmt"
+       "io/ioutil"
+       "net"
+       "os"
+
+       "github.com/containernetworking/cni/pkg/ns"
+       "github.com/containernetworking/cni/libcni"
+)
+
+func main(){
+       code := exec()
+       os.Exit(code)
+}
+
+func exec() int {
+       confBytes, err := ioutil.ReadAll(os.Stdin)
+       if err != nil {
+               fmt.Printf("could not read netconfig from stdin: %+v", err)
+               return 1
+       }
+
+       netConf, err := libcni.ConfFromBytes(confBytes)
+       if err != nil {
+               fmt.Printf("could not parse netconfig: %+v", err)
+               return 1
+       }
+       fmt.Printf("Parsed network configuration: %+v\n", netConf.Network)
+
+       if len(os.Args) == 1 {
+               fmt.Printf("Expect CNI plugin paths in argv")
+               return 1
+       }
+
+       targetNs, err := ns.NewNS()
+       if err !=  nil {
+               fmt.Printf("Could not create ns: %+v", err)
+               return 1
+       }
+       defer targetNs.Close()
+
+       ifName := "eth0"
+
+       runtimeConf := &libcni.RuntimeConf{
+               ContainerID: "some-container-id",
+               NetNS:       targetNs.Path(),
+               IfName:      ifName,
+       }
+
+       cniConfig := &libcni.CNIConfig{Path: os.Args[1:]}
+
+       result, err := cniConfig.AddNetwork(netConf, runtimeConf)
+       if err != nil {
+               fmt.Printf("AddNetwork failed: %+v", err)
+               return 2
+       }
+       fmt.Printf("AddNetwork result: %+v", result)
+
+       expectedIP := result.IP4.IP
+
+       err = targetNs.Do(func(ns.NetNS) error {
+               netif, err := net.InterfaceByName(ifName)
+               if err != nil {
+                       return fmt.Errorf("could not retrieve interface: %v", err)
+               }
+
+               addrs, err := netif.Addrs()
+               if err != nil {
+                       return fmt.Errorf("could not retrieve addresses, %+v", err)
+               }
+
+               found := false
+               for _, addr := range addrs {
+                       if addr.String() == expectedIP.String() {
+                               found = true
+                               break
+                       }
+               }
+
+               if !found {
+                       return fmt.Errorf("Far-side link did not have expected address %s", expectedIP)
+               }
+               return nil
+       })
+       if err != nil {
+               fmt.Println(err)
+               return 4
+       }
+
+       err = cniConfig.DelNetwork(netConf, runtimeConf)
+       if err != nil {
+               fmt.Printf("DelNetwork failed: %v", err)
+               return 5
+       }
+
+       err = targetNs.Do(func(ns.NetNS) error {
+               _, err := net.InterfaceByName(ifName)
+               if err == nil {
+                       return fmt.Errorf("interface was not deleted")
+               }
+               return nil
+       })
+       if err != nil {
+               fmt.Println(err)
+               return 6
+       }
+
+       return 0
+}
+`,
+       },
+}