Added cron example for FreeBSD

README.md

@@ -104,3 +104,10 @@ As you maybe noticed already before, `restic-backup.service` is configured to st
 Once in a while it can be good to do a health check of the remote repository, to make sure it's not getting corrupt. This can be done with `$ restic check`.
 
 There are some `*-check*`-files in this git repo. Install these in the same way you installed the `*-backup*`-files.
+
+
+## Cron?
+If you want to run an all-classic cron job instead, do like this:
+
+* `etc/cron.d/restic`: Depending on your system's cron, put this in `/etc/cron.d/` or similar, or copy the contents to $(sudo crontab -e). The format of this file is tested under FreeBSD, and might need adaptions depending on your cron.
+* `usr/local/sbin/cron_mail`: A wrapper for running cron jobs, that sends output of the job as an email using the mail(1) command.

etc/cron.d/restic

@@ -0,0 +1,8 @@
+SHELL=/bin/sh
+PATH=/etc:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin/:/usr/local/sbin/
+# Order of crontab fields
+# minute        hour    mday    month   wday    command
+# Reference: https://www.freebsd.org/doc/handbook/configtuning-cron.html
+# Reference: crontab(5).
+@midnight	root	cron_mail restic_backup.sh
+@monthly	root	cron_mail restic_check.sh

usr/local/sbin/cron_mail

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+# vi: ft=sh
+#
+# To be called by a cron job as a wrapper that sends stdour and stderr via the mail program.
+# Why? Because of FreeBSD the system cron uses sendmail, and I want to use ssmtp.
+# Make your crontab files like:
+#SHELL=/bin/sh
+#PATH=/etc:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/sbin
+#@daily       root    cron_mail freebsd-update cron
+
+mail_target=root
+scriptname=${0##*/}
+
+if [ $# -eq 0 ]; then
+	echo "No program to run given!" >&2
+	exit 1
+fi
+cmd="$@"
+
+body=$(eval "$cmd" 2>&1)
+
+if [ -n "$body" ];then
+	echo "$body" | mail -s "${scriptname}: ${cmd}" $mail_target
+fi