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Ensure screen is on/off at boot time based on a config file that matches the on/off timers

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KemoNine 2020-08-14 18:49:25 -04:00
parent 6f5ce35fee
commit 0a41d91c74
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83
docs/scheduled_display.md
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@ -6,12 +6,93 @@ The below is setup to turn the display on at ```0600``` and off at ```0000```. P
``` sh
pip3 install -U python-dotenv
cat > /etc/default/screen-on-off <<EOF
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# YOU MUST TWEAK THE screen-on.timer AND screen-off.timer IF CHANGING THESE VALUES
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# MUST BE A VALID TIME AND HAVE "*-*-* " AT THE START OF THE STRING
# Hours, Minutes and Seconds MUST be 0 padded (aka : we are using datetime.time.fromisoformat in the python3 stdlib)
# WE DO NOT SUPPORT DATES!!!!!
TIME_SCREEN_ON="*-*-* 06:00:00"
TIME_SCREEN_OFF="*-*-* 00:00:00"
# Indicate the ON time is the following day (aka turn off at night, on following next morning)
# REMEMBER: MIDNIGHT IS TODAY!
# To set true use 'true'
# To set false use ''
TIME_ON_IS_NEXT_DAY=''
EOF
cat > /usr/local/bin/screen-on-off <<EOF
#!/usr/bin/python3
# Load up the config file
from pathlib import Path
from dotenv import load_dotenv
env_path = Path('/etc/default/screen-on-off')
load_dotenv(dotenv_path=env_path)
# Get values from env vars
import os
TIME_SCREEN_ON = os.getenv("TIME_SCREEN_ON")
TIME_SCREEN_OFF = os.getenv("TIME_SCREEN_OFF")
TIME_ON_IS_NEXT_DAY = bool(os.getenv("TIME_ON_IS_NEXT_DAY"))
# Strip variables of data we don't support
TIME_SCREEN_ON = TIME_SCREEN_ON.strip('*-*-* ')
TIME_SCREEN_OFF = TIME_SCREEN_OFF.strip('*-*-* ')
# Convert strings to timestamps
from datetime import datetime, time, timedelta
current = datetime.now()
on = datetime.combine(current, time.fromisoformat(TIME_SCREEN_ON))
off = datetime.combine(current, time.fromisoformat(TIME_SCREEN_OFF))
# Adjust day of off time in case it's an overnight off
if TIME_ON_IS_NEXT_DAY:
on = on + timedelta(days=1)
# Let's do the quick checks to see if we are within the screen off window
turn_on = True
if on < off:
if on <= current <= off:
turn_on = False
else:
if off <= current <= on:
turn_on = False
# Turn screen on or off based on the schedule
import subprocess
if turn_on:
subprocess.check_call(['/opt/vc/bin/vcgencmd', 'display_power', '1'])
else:
subprocess.check_call(['/opt/vc/bin/vcgencmd', 'display_power', '0'])
EOF
chmod a+x /usr/local/bin/screen-on-off
cat > /etc/systemd/system/screen-on-off.service <<EOF
[Unit]
Description=auto-set screen on/off if rebooting (this will keep the screen off all but briefly during overnight reboots if the off window is set for overnight)
After=getty.target
[Service]
ExecStart=/usr/local/bin/screen-on-off
Type=oneshot
[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl enable --now screen-on-off.service
cat > /etc/systemd/system/screen-on.timer <<EOF
[Unit]
Description=Turn on display
[Timer]
OnCalendar=*-*-* 6:00:00
OnCalendar=*-*-* 06:00:00
Persistent=true
[Install]