Copy cron file into Docker container.

Author: Sneer-ra2

Dockerfile

@@ -50,5 +50,8 @@ RUN apt-get update && apt-get install -y cron && rm -rf /var/lib/apt/lists/*
 # Switch back to root to run cron
 USER root
 
-# Start cron in the foreground
-ENTRYPOINT ["cron", "-f", "-L", "2"]
+COPY entrypoint-cron.sh /entrypoint-cron.sh
+RUN chmod +x /entrypoint-cron.sh
+
+# Copies crontab and starts cron in the foreground
+ENTRYPOINT ["/entrypoint-cron.sh"]

entrypoint-cron.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+set -e
+
+if [ -f /mnt/crontab ]; then
+    cp /mnt/crontab /etc/cron.d/elogen-cron
+    chmod 644 /etc/cron.d/elogen-cron
+    chown root:root /etc/cron.d/elogen-cron
+else
+    echo "No crontab found at /mnt/crontab"
+fi
+
+# Do not exit container, but start cron in any case.
+exec cron -f -L 2