redirect stout cron output to cron process

Dockerfile

@@ -1,13 +1,18 @@
 # Snapraid 12.0
-FROM alpine:latest
+FROM ubuntu:22.04
 
-RUN apk --update add python3 git smartmontools tzdata && \
+RUN apt update
-    apk add snapraid --update-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing --allow-untrusted && \
+RUN DEBIAN_FRONTEND=noninteractive TZ=Etc/UTC apt install -y python3 git snapraid smartmontools tzdata cron
-    git clone https://github.com/Chronial/snapraid-runner.git /app/snapraid-runner && \
+RUN git clone https://github.com/Chronial/snapraid-runner.git /app/snapraid-runner
-    chmod +x /app/snapraid-runner/snapraid-runner.py && \
+RUN chmod +x /app/snapraid-runner/snapraid-runner.py
-    rm -rf /var/cache/apk/*
 
-RUN echo '0 3 * * * /usr/bin/python3 /app/snapraid-runner/snapraid-runner.py -c /config/snapraid-runner.conf' > /etc/crontabs/root
+RUN echo '0 3 * * * /usr/bin/python3 /app/snapraid-runner/snapraid-runner.py -c /config/snapraid-runner.conf > /proc/$(cat /var/run/crond.pid)/fd/1 2>&1' > /etc/cron.d/snapraid
+
+# Give execution rights on the cron job
+RUN chmod 0644 /etc/cron.d/snapraid
+
+# Apply cron job
+RUN crontab /etc/cron.d/snapraid
 
 VOLUME /mnt /config
 

docker-entry.sh

@@ -1,4 +1,4 @@
-#!/bin/ash
+#!/bin/bash
 # Ensures that configuration files for both SnapRAID and snapraid-runner are present
 # in /config. In reality, both files should be edited manually before running this
 # container to ensure correct operation.
@@ -18,10 +18,10 @@ if [ ! -f /config/snapraid-runner.conf ]; then
     exit 1
 fi
 
-# test if link is made between /etc/snapraid.conf and /config/snapraid.conf, make if not
+# test if link is made between /etc/snapraid.conf and /config/snapraid.conf, make if not
 if [ ! -L /etc/snapraid.conf ]; then
     ln -s /config/snapraid.conf /etc/snapraid.conf
 fi
 
-/usr/sbin/crond -d 6 -c /etc/crontabs -f 
+/usr/sbin/cron -f