Fix access to files on subdirectorties on /dev

Author: alexandref75

README.md

@@ -17,6 +17,10 @@ The smarter-device-manager starts by reading a YAML configuration file. This con
   nummaxdevices: 10
 ```
 
+Devices in subdirectories have the slash replaced with underscore in the
+resource name, due to kubernetes naming restrictions: e.g. `/dev/net/tun`
+becomes `smarter-devices/net_tun`.
+
 The default config file provided will enable most of the devices available on a Raspberry Pi (vers 1-4) or equivalent boards. I2C, SPI, video devices, sound and others would be enabled. The config file can be replaced using a configmap to enable or disable access to different devices, like accelerators, GPUs, etc.
 
 The node will show the devices it recognizes as resources in the node object in Kubernetes. The example below shows a raspberry PI.

main.go

@@ -56,17 +56,33 @@ func init() {
 }
 
 func readDevDirectory(dirToList string) (files []string, err error) {
-	f, err := os.Open(dirToList)
-	if err != nil {
-		return nil, err
-	}
-	files, err = f.Readdirnames(-1)
-	f.Close()
-	if err != nil {
-		return nil, err
-	}
+        var foundFiles []string
+
+        f, err := os.Open(dirToList)
+        if err != nil {
+                return nil, err
+        }
+        files, err = f.Readdirnames(-1)
+        if err != nil {
+                f.Close()
+                return nil, err
+        }
+        f.Close()
+        for _, subDir := range files {
+                foundFiles = append(foundFiles, subDir)
+                filesDir, err := readDevDirectory(dirToList+"/"+subDir)
+                if err == nil {
+                        for _, fileName := range filesDir {
+                                foundFiles = append(foundFiles, subDir+"/"+fileName)
+                        }
+                }
+        }
+
+        return foundFiles, nil
+}
 
-	return files, nil
+func sanitizeName(path string) string {
+        return strings.Replace(path, "/", "_" ,-1)
 }
 
 func findDevicesPattern(listDevices []string, pattern string) ([]string,error) {
@@ -151,9 +167,10 @@ func main() {
                         if len(foundDevices) > 0 {
                                 for _, deviceToCreate := range foundDevices {
                                         var newDevice DeviceInstance
+                                        deviceSafeName := sanitizeName(deviceToCreate)
                                         newDevice.deviceType = deviceFileType
-                                        newDevice.deviceName = "smarter-devices/" + deviceToCreate
-                                        newDevice.socketName = pluginapi.DevicePluginPath + "smarter-" + deviceToCreate + ".sock"
+                                        newDevice.deviceName = "smarter-devices/" + deviceSafeName
+                                        newDevice.socketName = pluginapi.DevicePluginPath + "smarter-" + deviceSafeName + ".sock"
                                         newDevice.deviceFile = "/dev/" + deviceToCreate
                                         newDevice.numDevices = deviceToTest.NumMaxDevices
                                         listDevicesAvailable = append(listDevicesAvailable, newDevice)