• 1 Post
  • 17 Comments
Joined 2 years ago
Cake day: June 12th, 2023
  • atzanteol@sh.itjust.workstoLinux@lemmy.ml•What's a unique customization on your Linux machine you think no one else has?English
    0·
    10 days ago

    It’s really quite simple - but works pretty well. There are 3 components:

    Kiosk service

    A simple systemd service that starts a kiosk script.

    [Unit]
Description=Kiosk
Wants=graphical.target
After=graphical.target

[Service]
Environment=DISPLAY=:0.0
Environment=XAUTHORITY=/home/pi/.Xauthority
Type=simple
ExecStart=/bin/bash /home/pi/kiosk.sh
Restart=on-abort
User=pi
Group=pi

[Install]
WantedBy=graphical.target

    Kiosk script

    The script in /home/pi/kiosk.sh just starts a web browser in full-screen mode pointed at my home assistant instance:

    #!/bin/bash

xset s noblank
xset s off
xset -dpms

export DISPLAY=:0.0 

echo 0 > /sys/class/backlight/rpi_backlight/bl_power

LANDING_PAGE="https://homeassistant.example.com/"

unclutter -idle 0.5 -root &

/usr/bin/chromium-browser --noerrdialogs --disable-infobars --kiosk $LANDING_PAGE

    Display service

    I have a very simple python/flask service that runs and exposes an endpoint that lets you turn on/off the display. It’s called by a homeassistant automation for when the motion detector senses or hasn’t sensed movement.

    Here’s the python - I have this started from another “kiosk.service” systemd service as well.

    #!/usr/bin/env python3
import subprocess

from flask import Flask
from flask_restful import Api, Resource

def turn_off_display():
    with(open(backlight_dev, 'w')) as dev:
        dev.write("1")


def turn_on_display():
    with(open(backlight_dev, 'w')) as dev:
        dev.write("0")


class DisplayController(Resource):
    def get(self, state):
        if state == 'off':
            turn_off_display()
        elif state == 'on':
            turn_on_display()
        else:
            return {'message': f'Unknown state {state} - should be off/on'}, 500
        return {"message": "Success"}


def init():
    turn_on_display()


if __name__ == "__main__":
    init()
    app = Flask(__name__)
    api = Api(app)
    api.add_resource(DisplayController, '/display/<string:state>')
    app.run(debug=False, host='0.0.0.0', port=3000)

    You can then have the HA rest action call this with “http://pidisplay:3000/display/on” or off.

  • atzanteol@sh.itjust.workstoLinux@lemmy.ml•Use arguments in shell script with aptEnglish
    0·
    14 days ago

    For apt to install a local file I think you need either a fully qualified path or to use “./” at the start for a relative path.

    So “./$1/opensnitch_${1}_amd64.deb”

    apt install 1.6.5/opensnitch_1.6.5_amd64.deb 1.6.5/python3-opensnitch-ui_1.6.5_all.deb

    Edit: Here’s a better example of what I think you would want:

    #!/bin/bash
# Often good to assign a numbered parameter to a variable
VER="${1}"
apt install "./${VER}/opensnitch_${VER}_amd64.deb" "./${VER}/python3-opensnitch-ui_${VER}_all.deb"

    Also - when debugging bash scripts it’s often helpful to just put “echo” before the line you’re questioning to see what exactly is being run. e.g.:

    #!/bin/bash
VER="${1}"
echo apt install "./${VER}/opensnitch_${VER}_amd64.deb" "./${VER}/python3-opensnitch-ui_${VER}_all.deb"

    That will show the the command that would have run rather than running it, then you can inspect it for errors and even copy/paste it to run it by hand.