feat: add scheduled cron tasks for repeated actions

- Generates PDFs every few minutes
- Checks plagiarism every week
- Sends weekly emails
- Synchronises enrolments every day

pdfGen/crontab

@@ -1,4 +1,8 @@
-10,15,20,25,30,35,40,45,50,55 * * * * /doubtfire/lib/shell/generate_pdfs.sh
-0 5 * * 1,3,5 /doubtfire/lib/shell/check_plagiarism.sh
-0 7 * * 1 /doubtfire/lib/shell/send_weekly_emails.sh
-0 1 * * * /doubtfire/lib/shell/sync_enrolments.sh
+SHELL=/bin/bash
+BASH_ENV=/container.env
+PATH=/tmp/texlive/bin/x86_64-linux:/usr/local/bundle/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/bundle/bin
+
+10,15,20,25,30,35,40,45,50,55 * * * * /doubtfire/lib/shell/generate_pdfs.sh > /proc/1/fd/1 2>/proc/1/fd/2
+0 5 * * 1,3,5 /doubtfire/lib/shell/check_plagiarism.sh > /proc/1/fd/1 2>/proc/1/fd/2
+0 7 * * 1 /doubtfire/lib/shell/send_weekly_emails.sh > /proc/1/fd/1 2>/proc/1/fd/2
+0 1 * * * /doubtfire/lib/shell/sync_enrolments.sh > /proc/1/fd/1 2>/proc/1/fd/2

pdfGen/entry_point.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Start the run once job.
+echo "Docker container has been started"
+
+# Save the docker user environment
+declare -p | grep -Ev 'BASHOPTS|BASH_VERSINFO|EUID|PPID|SHELLOPTS|UID' > /container.env
+cat /container.env
+
+# Ensure log is present
+touch /var/log/cron.log
+
+sleep 1
+
+# Setup crontab - clear then load with file
+crontab -r
+crontab /etc/cron.d/container_cronjob
+
+echo "RESET CRONTAB" >> /var/log/cron.log
+
+
+# Run cron and follow log
+chmod 644 /etc/cron.d/container_cronjob && cron -f && tail -f /var/log/cron.log > /proc/1/fd/1 2>/proc/1/fd/2

pdfgen.Dockerfile

@@ -20,9 +20,6 @@ RUN apt-get update && apt-get install -y \
 # Setup the folder where we will deploy the code
 WORKDIR /doubtfire
 
-# Crontab file copied to cron.d directory.
-COPY "$PDFGEN_HOME"/cronjob /etc/cron.d/container_cronjob
-
 # Install LaTex
 COPY "$API_HOME"/.ci-setup /doubtfire/.ci-setup
 RUN /doubtfire/.ci-setup/texlive-install.sh
@@ -39,6 +36,11 @@ ENV PATH /tmp/texlive/bin/x86_64-linux:$PATH
 
 # Copy doubtfire-api source
 COPY "$API_HOME" /doubtfire/
-COPY "$PDFGEN_HOME"/script.sh /doubtfire/
 
-CMD script.sh
+# Crontab file copied to cron.d directory.
+COPY "$PDFGEN_HOME"/entry_point.sh /doubtfire/
+COPY "$PDFGEN_HOME"/crontab /etc/cron.d/container_cronjob
+
+RUN touch /var/log/cron.log
+
+CMD /doubtfire/entry_point.sh