better entrypoint, crontab in env

README.md

@@ -3,3 +3,28 @@
 [![Build Status](https://drone.asperti.com/api/badges/paspo/docker-python-runner/status.svg)](https://drone.asperti.com/paspo/docker-python-runner)
 
 Base docker container for running python scripts.
+
+## usage
+
+```yaml
+version: '3.6'
+services:
+  runner:
+    image: docker.asperti.com/paspo/python-runner:latest
+    container_name: python-scripts
+    restart: unless-stopped
+    volumes:
+      - ./scripts:/scripts
+      - ./logs:/var/log
+    environment:
+      CRONTAB: >
+        */5 7-22 * * * /scripts/test.py
+        */10 7-22 * * * /scripts/test2.py
+```
+
+```bash
+mkdir scripts logs
+touch scripts/test.py && chmod +x scripts/test.py
+touch scripts/test2.py && chmod +x scripts/test2.py
+docker-compose up -d
+```

docker/Dockerfile

@@ -1,10 +1,13 @@
 FROM alpine:3.16
 
 COPY logrotate-cron /etc/logrotate.d
+COPY entrypoint.sh /
 
 RUN \
   mkdir /scripts /crontabs && \
   apk -U add python3 py3-pip py3-requests py3-dateutil py3-beautifulsoup4 logrotate && \
   pip3 install fdb mysql-connector-python==8.0.29 telepot caldav
 
-ENTRYPOINT ["/usr/sbin/crond", "-f", "-d8", "-L", "/var/log/cron.log", "-c", "/crontabs"]
+ENV CRONTAB=""
+
+ENTRYPOINT ["/bin/sh", "/entrypoint.sh"]

docker/entrypoint.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+echo "${CRONTAB}" > /crontabs/root
+
+/usr/sbin/crond -f -d8 -L /var/log/cron.log -c /crontabs