Created
February 2, 2022 05:52
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generate cron jobs based on sunrise/sunset, independent of daylight savings time
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#!/usr/bin/env python3 | |
import ephem | |
from datetime import datetime, timedelta, timezone | |
# don't generate any invocations until | |
SKIP_UNTIL = datetime(2021, 10, 16, 12, 0, 0) | |
# times to run per day | |
FOODS = 8 | |
# thing to run | |
SCRIPT = "/home/pi/dispense.py" | |
sun=ephem.Sun() | |
# where you are | |
boulder=ephem.Observer() | |
boulder.lat='40:0:53.94' | |
boulder.lon='-105:16:13.96' | |
boulder.date=datetime.now().replace(hour=0, minute=0, second=0).astimezone(timezone.utc) | |
print("# {} {}".format(boulder.lat, boulder.lon)) | |
if SKIP_UNTIL > datetime.now(): | |
print("# Skipping until {}".format(SKIP_UNTIL)) | |
print() | |
def generate(sunrise, sunset): | |
s = "# {} {} -> {} ({})".format( | |
sunrise.date().isoformat(), | |
sunrise.time().isoformat()[:8], | |
sunset.time().isoformat()[:8], | |
sunset - sunrise) | |
print(s) | |
# start one hour after sunrise | |
start = sunrise + timedelta(hours=1) | |
# stop 3/4 of the way between sunset and midnight | |
midnight = datetime(sunset.year, sunset.month, sunset.day) + timedelta(days=1) | |
nightoffset = 3.0 * ((midnight - sunset) / 4.0) | |
stop = sunset + nightoffset | |
step = (stop - start) / (FOODS - 1) | |
cronline = "{:2d} {:2d} {:2d} {:2d} {} {} sleep {:2d} ; {}" | |
for j in range(FOODS): | |
t = start + j * step | |
t -= timedelta(seconds=1) | |
if t <= SKIP_UNTIL: | |
print("# ", end='') | |
print(cronline.format(t.minute, t.hour, t.day, t.month, "*", "root", | |
t.second, SCRIPT)) | |
print() | |
for i in range(7): | |
sunrise = boulder.next_rising(sun) | |
boulder.date = sunrise | |
sunrise = ephem.localtime(sunrise) | |
sunset = boulder.next_setting(sun) | |
boulder.date = sunset | |
sunset = ephem.localtime(sunset) | |
generate(sunrise, sunset) |
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