backup stuff

ansible/roles/backup_source/templates/backup.service.j2

@@ -0,0 +1,14 @@
+[Unit]
+Description={{ backup_source_description }} backup
+{% if backup_source_stop_service %}
+{# systemd rejects a bare name here ("Failed to add dependency ... Invalid
+   argument"), so normalise to a full unit name. #}
+After={{ backup_source_stop_service if '.' in backup_source_stop_service else backup_source_stop_service ~ '.service' }}
+{% endif %}
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/{{ backup_source_name }}-backup.sh
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier={{ backup_source_name }}-backup