Adding dynamic Flexvolume plugin discovery capability, using filesystem watch.

cmd/kubelet/app/plugins.go

@@ -61,9 +61,7 @@ import (
 )
 
 // ProbeVolumePlugins collects all volume plugins into an easy to use list.
-// PluginDir specifies the directory to search for additional third party
-// volume plugins.
-func ProbeVolumePlugins(pluginDir string) []volume.VolumePlugin {
+func ProbeVolumePlugins() []volume.VolumePlugin {
 	allPlugins := []volume.VolumePlugin{}
 
 	// The list of plugins to probe is decided by the kubelet binary, not
@@ -88,7 +86,6 @@ func ProbeVolumePlugins(pluginDir string) []volume.VolumePlugin {
 	allPlugins = append(allPlugins, downwardapi.ProbeVolumePlugins()...)
 	allPlugins = append(allPlugins, fc.ProbeVolumePlugins()...)
 	allPlugins = append(allPlugins, flocker.ProbeVolumePlugins()...)
-	allPlugins = append(allPlugins, flexvolume.ProbeVolumePlugins(pluginDir)...)
 	allPlugins = append(allPlugins, azure_file.ProbeVolumePlugins()...)
 	allPlugins = append(allPlugins, configmap.ProbeVolumePlugins()...)
 	allPlugins = append(allPlugins, vsphere_volume.ProbeVolumePlugins()...)
@@ -102,6 +99,13 @@ func ProbeVolumePlugins(pluginDir string) []volume.VolumePlugin {
 	return allPlugins
 }
 
+// GetDynamicPluginProber gets the probers of dynamically discoverable plugins
+// for kubelet.
+// Currently only Flexvolume plugins are dynamically discoverable.
+func GetDynamicPluginProber(pluginDir string) volume.DynamicPluginProber {
+	return flexvolume.GetDynamicPluginProber(pluginDir)
+}
+
 // ProbeNetworkPlugins collects all compiled-in plugins
 func ProbeNetworkPlugins(pluginDir, cniConfDir, cniBinDir string) []network.NetworkPlugin {
 	allPlugins := []network.NetworkPlugin{}