Updated README and added gid check

Signed-off-by: Matt Bentley <mbentley@mbentley.net>

README.md

@@ -33,7 +33,7 @@ docker run -d \
 
 ## Time Zones
 
-By default, this image used the `Etc/UTC` time zone.  You may update the time zone used by passing a different value in the `TZ` variable.  See [List of tz database time zones](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones#List) for a complete list of values in the `TZ database name` table column.
+By default, this image uses the `Etc/UTC` time zone.  You may update the time zone used by passing a different value in the `TZ` variable.  See [List of tz database time zones](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones#List) for a complete list of values in the `TZ database name` table column.
 
 ## Persistent Data and Permissions
 

entrypoint.sh

@@ -10,10 +10,13 @@ echo "INFO: Time zone set to '${TZ}'"
 # make sure permissions are set appropriately on each directory
 for DIR in data work logs
 do
-  if [ "$(stat -c '%u' /opt/tplink/EAPController/${DIR})" != "508" ]
+  OWNER="$(stat -c '%u' /opt/tplink/EAPController/${DIR}))"
+  GROUP="$(stat -c '%g' /opt/tplink/EAPController/${DIR}))"
+
+  if [ "${OWNER}" != "508" ] || [ "${GROUP}" != "508" ]
   then
-    echo "ERROR: ownership not set appropriate on /opt/tplink/EAPController/${DIR}"
-    echo "  Hint: ownership should be set to 508:508; see https://github.com/mbentley/docker-omada-controller#persistent-data-and-permissions"
+    echo "ERROR: owner or group (${OWNER}:${GROUP}) not set correctly on /opt/tplink/EAPController/${DIR}"
+    echo "  Hint: owner and group should be set to 508:508; see https://github.com/mbentley/docker-omada-controller#persistent-data-and-permissions"
     exit 1
   fi
 done