add data folder permission validation

agent will not boot up if not having any permissions

machinery/main.go

@@ -44,6 +44,13 @@ func main() {
 			name := os.Args[2]
 			port := os.Args[3]
 
+			// Check the folder permissions, it might be that we do not have permissions to write
+			// recordings, update the configuration or save snapshots.
+			err := utils.CheckDataDirectoryPermissions()
+			if err != nil {
+				log.Log.Fatal(err.Error())
+			}
+
 			// Read the config on start, and pass it to the other
 			// function and features. Please note that this might be changed
 			// when saving or updating the configuration through the REST api or MQTT handler.

machinery/src/utils/main.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"math/rand"
@@ -85,6 +86,41 @@ func CountDigits(i int64) (count int) {
 	return count
 }
 
+func CheckDataDirectoryPermissions() error {
+	recordingsDirectory := "./data/recordings"
+	configDirectory := "./data/config"
+	snapshotsDirectory := "./data/snapshots"
+
+	err := CheckDirectoryPermissions(recordingsDirectory)
+	if err != nil {
+		return err
+	}
+	err = CheckDirectoryPermissions(configDirectory)
+	if err != nil {
+		return err
+	}
+	err = CheckDirectoryPermissions(snapshotsDirectory)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func CheckDirectoryPermissions(directory string) error {
+	file := directory + "/.test"
+	f, err := os.Create(file)
+	defer f.Close()
+	if err == nil {
+		err := os.Remove(file)
+		if err == nil {
+			return nil
+		} else {
+			return errors.New("Problem deleting a file: " + err.Error())
+		}
+	}
+	return errors.New("Problem creating a file: " + err.Error())
+}
+
 func ReadDirectory(directory string) ([]os.FileInfo, error) {
 	ff, err := ioutil.ReadDir(directory)
 	if err != nil {