I just noticed the absurdity of this code I wrote yesterday. Javascript inside Python inside Bash inside Jinja inside YAML, and perilously close to a layer of regex too.

gistfile1.txt

configure_osrmweb:
  cmd.run:
    - cwd: /usr/share/nginx/www/osrm/WebContent
    - name: |
        python <<EOF
        import os, sys, re
        os.rename('OSRM.config.js', 'OSRM.config.js.orig')
        # In the process we convert line endings for some reason. :/
        with open('OSRM.config.js.orig', 'r') as fin, open('OSRM.config.js', 'w') as fout:
            data = fin.read()
            
            data = re.sub(r'(ROUTING_ENGINES: \[).*?(\s+\],)', r'\1\n' +
            {% for instance in tm_osrminstances %}
              '{\n' + 
              '  url: "http://{{ grains.fqdn }}:{{ instance.port}}/viaroute",\n' +
              '  timestamp:  "http://{{ grains.fqdn }}:{{ instance.port}}/timestamp",\n' +
              '  metric: 1,\n' +
              '  label: "{{ instance.name }}",\n'
              '}, \n' +
            {% endfor %}
              r'\2\n', data, flags=re.DOTALL)
            fout.write(data)
        EOF
        echo
        if [ "`diff OSRM.config.js OSRM.config.js.orig`" ]; then echo "changed=yes"; else echo "changed=no"; fi
    - stateful: True