WeeWX error on Trixie during startup

[David Enstrom]

Just installed Trixie on my Raspberry Pi 3. I created a virtual environment and installed Python, required software, and WeeWX using PIP. The weather hardware is from BC Robotics, which has worked beautifully for many years. I wrote the driver many years ago.

My test app runs fine. I can also run WeeWX manually (i.e., activate my weeve virtual environment and then run 'weewxd') and it operates just fine. However, if I start weewx using the command 'sudo systemctl start weewx' and check the system log it does not start properly. I'm very confused by the following error in the log:

Oct 08 08:35:08 raspberrypi systemd[1]: Started weewx.service - WeeWX weather system.
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Initializing weewxd version 5.1.0
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Command line: /home/dave/weeve/lib/python3.13/site-packages/weewxd.py /home/dave/weewx-data/weewx.conf
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Using Python: 3.13.5 (main, Jun 25 2025, 18:55:22) [GCC 14.2.0]
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Located at:   /home/dave/weeve/bin/python3
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Platform:     Linux-6.12.47+rpt-rpi-v8-aarch64-with-glibc2.41
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Locale:       'en_CA.UTF-8'
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Entry path:   /home/dave/weeve/lib/python3.13/site-packages/weewxd.py
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: WEEWX_ROOT:   /home/dave/weewx-data
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Config file:  /home/dave/weewx-data/weewx.conf
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: User module:  /home/dave/weewx-data/bin/user
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Debug:        0
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: User:         dave
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Group:        dave
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO __main__: Groups:       adm dialout cdrom sudo audio video plugdev games users netdev lpadmin gpio i2c spi render input dave
Oct 08 08:35:09 raspberrypi weewxd[4962]: INFO weewx.engine: Loading station type BCRobotics (user.BCRobotics)
Oct 08 08:35:09 raspberrypi python3[4962]: 2025-10-08 08:35:09 xCreatePipe: Can't set permissions (436) for //.lgd-nfy0, No such file or directory
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__: Caught OSError: [Errno 2] No such file or directory: '.lgd-nfy-3'
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****  Traceback (most recent call last):
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/home/dave/weeve/lib/python3.13/site-packages/weewxd.py", line 121, in main
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      engine = weewx.engine.StdEngine(config_dict)
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/home/dave/weeve/lib/python3.13/site-packages/weewx/engine.py", line 80, in __init__
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      self.setupStation(config_dict)
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/home/dave/weeve/lib/python3.13/site-packages/weewx/engine.py", line 104, in setupStation
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      __import__(driver)
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      ~~~~~~~~~~^^^^^^^^
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/home/dave/weewx-data/bin/user/BCRobotics.py", line 29, in <module>
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      import board
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/home/dave/weeve/lib/python3.13/site-packages/board.py", line 51, in <module>
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      from adafruit_blinka.board.raspberrypi.raspi_40pin import *
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/home/dave/weeve/lib/python3.13/site-packages/adafruit_blinka/board/raspberrypi/raspi_40pin.py", line 6, in <module>
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      from adafruit_blinka.microcontroller.bcm283x import pin
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/home/dave/weeve/lib/python3.13/site-packages/adafruit_blinka/microcontroller/bcm283x/pin.py", line 7, in <module>
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      from adafruit_blinka.microcontroller.generic_linux.rpi_gpio_pin import Pin
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/home/dave/weeve/lib/python3.13/site-packages/adafruit_blinka/microcontroller/generic_linux/rpi_gpio_pin.py", line 6, in <module>
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      from RPi import GPIO
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/usr/lib/python3/dist-packages/RPi/GPIO/__init__.py", line 14, in <module>
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      import lgpio
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/usr/lib/python3/dist-packages/lgpio.py", line 562, in <module>
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      _notify_thread = _callback_thread()
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****    File "/usr/lib/python3/dist-packages/lgpio.py", line 504, in __init__
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****      self._file = open('.lgd-nfy{}'.format(self._notify), 'rb')
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****                   ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****  FileNotFoundError: [Errno 2] No such file or directory: '.lgd-nfy-3'
Oct 08 08:35:09 raspberrypi weewxd[4962]: CRITICAL __main__:     ****  Waiting 10 seconds then retrying...

HELP!!

[matthew wall]

hi david,

perhaps others in this forum could help if you post your driver code, but here is a guess:

it looks like your driver is using a file related to gpio (perhaps a socket?) whose location is not explicitly specified, so when you run it as you the file is in a directory in which you have permissions, but when you run it as a daemon (under the control of systemd) the file ends up somewhere that you do *not* have permissions.

take a look at your driver code for details about how you do the gpio, and see if you can specify the location explicitly, e.g., to /var/tmp or /tmp

m

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[David Enstrom]

I think something has changed with the WeeWX startup (as daemon) under Trixie. This is the same error, with a solution:

      https://github.com/gpiozero/gpiozero/discussions/1153

I logged the working directory at start up of WeeWX as a daemon:  Current working directory: /   

This seems rather odd!

So, when I change it to /tmp/ in my BCRobotics.py driver, and it works just fine! (i.e., os.chdir("/tmp/")

I logged the change:

Current working directory: /
New working directory: /tmp

So, it is fixed (WeeWX runs fine), but I am still confused as to the root cause! Trixie?

[vince]

If by many years ago you mean you were previously successfully running weewx v4 or earlier (which ran as root) and it broke now using weewx v5 (which runs as a unprivileged user) then that’s the cause. Your unprivileged process tried to write to a privileged location.

If you were previously running weewx v5 and the only change you made was updating your os, then I no ideas here.

[David Enstrom]

I was previously running WeeWX V5 with no issues ... really the only change was the OS, to Trixie.

[Graham Eddy]

i upgraded bookworm to trixie with no such issues. it is specific to this installation. i think the clue is all in the error message:

**** FileNotFoundError: [Errno 2] No such file or directory: '.lgd-nfy-3'

⊣GE⊢

[David Enstrom]

Clarification: currently running WeeWX V5.0.2 

So something has changed to cause this error: either the OS to Trixie or WeeWX to V5.1.0