Validate Moonraker conf on save

[leigh-johnson]

Describe the bug

I'm seeing reports that Moonraker crashes when using the default moonraker.conf https://github.com/bitsy-ai/printnanny-settings/blob/4fe6928b8864cd5b578356539b5d7b7395785d06/moonraker/moonraker.conf

Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - data_path: /home/printnanny/.local/share/moonraker
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - is_default_data_path: False
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - config_file: /home/printnanny/.config/printnanny/vcs/moonraker/moonraker.conf
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - startup_warnings: []
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - verbose: False
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - debug: False
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - asyncio_debug: False
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - is_backup_config: False
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - log_file: /var/log/moonraker/moonraker.log
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - software_version: ?
Jun 30 20:51:06 x10m-0000 bash[678]: [utils.py:setup_logging()] - python_version: 3.11.2 (main, Feb  7 2023, 13:52:42) [GCC 12.2.0]
Jun 30 20:51:06 x10m-0000 bash[678]: [confighelper.py:read_file()] - Configuration File '/home/printnanny/.config/printnanny/vcs/moonraker/moonraker.conf' parsed, total size: 0 B
Jun 30 20:51:06 x10m-0000 bash[678]: [moonraker.py:main()] - Server Config Error
Jun 30 20:51:06 x10m-0000 bash[678]: Traceback (most recent call last):
Jun 30 20:51:06 x10m-0000 bash[678]:   File "/home/printnanny/.moonraker/moonraker/moonraker.py", line 497, in main
Jun 30 20:51:06 x10m-0000 bash[678]:     server = Server(app_args, file_logger, event_loop)
Jun 30 20:51:06 x10m-0000 bash[678]:              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jun 30 20:51:06 x10m-0000 bash[678]:   File "/home/printnanny/.moonraker/moonraker/moonraker.py", line 72, in __init__
Jun 30 20:51:06 x10m-0000 bash[678]:     self.config = config = self._parse_config()
Jun 30 20:51:06 x10m-0000 bash[678]:                            ^^^^^^^^^^^^^^^^^^^^
Jun 30 20:51:06 x10m-0000 bash[678]:   File "/home/printnanny/.moonraker/moonraker/moonraker.py", line 133, in _parse_config
Jun 30 20:51:06 x10m-0000 bash[678]:     config = confighelper.get_configuration(self, self.app_args)
Jun 30 20:51:06 x10m-0000 bash[678]:              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jun 30 20:51:06 x10m-0000 bash[678]:   File "/home/printnanny/.moonraker/moonraker/confighelper.py", line 1042, in get_configuration
Jun 30 20:51:06 x10m-0000 bash[678]:     raise ConfigError("No section [server] in config")
Jun 30 20:51:06 x10m-0000 bash[678]: confighelper.ConfigError: No section [server] in config
Jun 30 20:51:06 x10m-0000 bash[678]: [moonraker.py:main()] - Server Shutdown
Jun 30 20:51:06 x10m-0000 systemd[1]: moonraker.service: Main process exited, code=exited, status=1/FAILURE
Jun 30 20:51:06 x10m-0000 systemd[1]: moonraker.service: Failed with result 'exit-code'.

Issue.txt

-----------------------
Build Info:  |
-----------------------
IMAGE_NAME = printnanny-release-image-raspberrypi4-64-20230528210042
DISTRO_PRETTY = PrintNanny Linux 0.7.2 (Garnet)
VARIANT_NAME = PrintNanny OS Core
VARIANT_ID = core
DISTRO = printnanny
DISTRO_NAME = PrintNanny Linux
DISTRO_VERSION = 0.7.2
DISTRO_CODENAME = Garnet
ID_LIKE = BitsyLinux
HOME_URL = https://printnanny.ai
BUG_REPORT_URL = https://github.com/bitsy-ai/printnanny-os/issues
YOCTO_VERSION = 4.1.2
YOCTO_CODENAME = Langdale
MACHINE = raspberrypi4-64
TUNE_PKGARCH = cortexa72
-----------------------
Layer Revisions:      |
-----------------------
meta              = mickledore:ddb298ce894482467d82699d223c5555baad6591
meta-poky         = mickledore:ddb298ce894482467d82699d223c5555baad6591
meta-yocto-bsp    = mickledore:ddb298ce894482467d82699d223c5555baad6591
meta-oe           = mickledore-polkit-src:4321a5fd17fa2c307ca579ae76b921fb4c560bfa
meta-networking   = mickledore-polkit-src:4321a5fd17fa2c307ca579ae76b921fb4c560bfa
meta-python       = mickledore-polkit-src:4321a5fd17fa2c307ca579ae76b921fb4c560bfa
meta-webserver    = mickledore-polkit-src:4321a5fd17fa2c307ca579ae76b921fb4c560bfa
meta-initramfs    = mickledore-polkit-src:4321a5fd17fa2c307ca579ae76b921fb4c560bfa
meta-bitsy        = upgrade-printnanny-rs-deps:7e551cb649692815d9ff1c300dbbaef13bae338b
meta-microcontroller = mickledore:a848733698649628d0c3e34ae04ced0ee6ce3aee
meta-neural-network = mickledore:39f06bfa582eedc8621df677bb5cf044e9481309
meta-raspberrypi  = issue-1167-raspberrypi-hq-camera:26a25492a639310bb94afd4b2b066895c9217bad
meta-swupdate     = master:19007b03a1d96eca38e12f3bbd7bb296aea50bab
meta-printnanny   = upgrade-printnanny-rs-deps:7e551cb649692815d9ff1c300dbbaef13bae338b
meta-multimedia   = mickledore-polkit-src:4321a5fd17fa2c307ca579ae76b921fb4c560bfa

[leigh-johnson]

After digging in a bit more, it turns out the reporter removed the [server] section from their moonraker.conffile. Updating this issue to an enhancement, which is to validate conf on load/save.

[leigh-johnson]

While we're on Moonraker / Klipper config, I think we should improve our documentation on enabling Moonraker / Klipper / Mainsail and setting up printer.cfg.

Right now, we ship a default printer.cfg that doesn't work with ANY printer out of the box, but we don't provide detailed instructions about how to proceed. https://github.com/bitsy-ai/printnanny-settings/blob/main/klipper/printer.cfg

1. We should reference the defaults/examples here:
   https://github.com/Klipper3d/klipper/tree/master/config

2. We should provide common mainsail / printnanny config partials, and allow the user to write the rest of printer.cfg, e.g.

[include mainsail.cfg]
[include printnanny.cfg]