Add Drivers method to the Network Interface

Drivers should return the list of supported network drivers by this
plugin. This is useful for podman info.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

libpod/info.go

@@ -18,7 +18,6 @@ import (
 	"github.com/containers/image/v5/pkg/sysregistriesv2"
 	"github.com/containers/podman/v3/libpod/define"
 	"github.com/containers/podman/v3/libpod/linkmode"
-	"github.com/containers/podman/v3/libpod/network/types"
 	"github.com/containers/podman/v3/pkg/cgroups"
 	"github.com/containers/podman/v3/pkg/rootless"
 	"github.com/containers/storage"
@@ -73,8 +72,7 @@ func (r *Runtime) info() (*define.Info, error) {
 		volumePlugins = append(volumePlugins, plugin)
 	}
 	info.Plugins.Volume = volumePlugins
-	// TODO move this into the new network interface
-	info.Plugins.Network = []string{types.BridgeNetworkDriver, types.MacVLANNetworkDriver}
+	info.Plugins.Network = r.network.Drivers()
 	info.Plugins.Log = logDrivers
 
 	info.Registries = registries

libpod/network/cni/network.go

@@ -106,6 +106,12 @@ func NewCNINetworkInterface(conf InitConfig) (types.ContainerNetwork, error) {
 	return n, nil
 }
 
+// Drivers will return the list of supported network drivers
+// for this interface.
+func (n *cniNetwork) Drivers() []string {
+	return []string{types.BridgeNetworkDriver, types.MacVLANNetworkDriver}
+}
+
 func (n *cniNetwork) loadNetworks() error {
 	// skip loading networks if they are already loaded
 	if n.networks != nil {

libpod/network/types/network.go

@@ -23,6 +23,10 @@ type ContainerNetwork interface {
 	Setup(namespacePath string, options SetupOptions) (map[string]StatusBlock, error)
 	// Teardown will teardown the container network namespace.
 	Teardown(namespacePath string, options TeardownOptions) error
+
+	// Drivers will return the list of supported network drivers
+	// for this interface.
+	Drivers() []string
 }
 
 // Network describes the Network attributes.