cnitool CNI 1.1.0 support

This change make cnitool CNI v1.1.0 support. This also addresses
to fix error crash in case of GC with empty attachments.

Signed-off-by: Tomofumi Hayashi <[email protected]>

Author: s1061123

cnitool/cnitool

@@ -36,9 +36,11 @@ const (
 
 	DefaultNetDir = "/etc/cni/net.d"
 
-	CmdAdd   = "add"
-	CmdCheck = "check"
-	CmdDel   = "del"
+	CmdAdd    = "add"
+	CmdCheck  = "check"
+	CmdDel    = "del"
+	CmdGC     = "gc"
+	CmdStatus = "status"
 )
 
 func parseArgs(args string) ([][2]string, error) {
@@ -125,16 +127,23 @@ func main() {
 		exit(err)
 	case CmdDel:
 		exit(cninet.DelNetworkList(context.TODO(), netconf, rt))
+	case CmdGC:
+		// Currently just invoke GC without args, hence all network interface should be GC'ed!
+		exit(cninet.GCNetworkList(context.TODO(), netconf, nil))
+	case CmdStatus:
+		exit(cninet.GetStatusNetworkList(context.TODO(), netconf))
 	}
 }
 
 func usage() {
 	exe := filepath.Base(os.Args[0])
 
-	fmt.Fprintf(os.Stderr, "%s: Add, check, or remove network interfaces from a network namespace\n", exe)
-	fmt.Fprintf(os.Stderr, "  %s add   <net> <netns>\n", exe)
-	fmt.Fprintf(os.Stderr, "  %s check <net> <netns>\n", exe)
-	fmt.Fprintf(os.Stderr, "  %s del   <net> <netns>\n", exe)
+	fmt.Fprintf(os.Stderr, "%s: Add, check, remove, gc or status network interfaces from a network namespace\n", exe)
+	fmt.Fprintf(os.Stderr, "  %s add    <net> <netns>\n", exe)
+	fmt.Fprintf(os.Stderr, "  %s check  <net> <netns>\n", exe)
+	fmt.Fprintf(os.Stderr, "  %s del    <net> <netns>\n", exe)
+	fmt.Fprintf(os.Stderr, "  %s gc     <net> <netns>\n", exe)
+	fmt.Fprintf(os.Stderr, "  %s status <net> <netns>\n", exe)
 	os.Exit(1)
 }
 

cnitool/cnitool.go

@@ -765,9 +765,12 @@ func (c *CNIConfig) GCNetworkList(ctx context.Context, list *NetworkConfigList,
 		return nil
 	}
 
-	validAttachments := make(map[types.GCAttachment]interface{}, len(args.ValidAttachments))
-	for _, a := range args.ValidAttachments {
-		validAttachments[a] = nil
+	var validAttachments map[types.GCAttachment]interface{}
+	if args != nil {
+		validAttachments = make(map[types.GCAttachment]interface{}, len(args.ValidAttachments))
+		for _, a := range args.ValidAttachments {
+			validAttachments[a] = nil
+		}
 	}
 
 	var errs []error
@@ -800,10 +803,13 @@ func (c *CNIConfig) GCNetworkList(ctx context.Context, list *NetworkConfigList,
 	// now, if the version supports it, issue a GC
 	if gt, _ := version.GreaterThanOrEqualTo(list.CNIVersion, "1.1.0"); gt {
 		inject := map[string]interface{}{
-			"name":                      list.Name,
-			"cniVersion":                list.CNIVersion,
-			"cni.dev/valid-attachments": args.ValidAttachments,
+			"name":       list.Name,
+			"cniVersion": list.CNIVersion,
+		}
+		if args != nil {
+			inject["cni.dev/valid-attachments"] = args.ValidAttachments
 		}
+
 		for _, plugin := range list.Plugins {
 			// build config here
 			pluginConfig, err := InjectConf(plugin, inject)