Rudder

The error manifests itself by:

- no technique anymore in the technique editor,
- error in /var/log/rudder/webapp/....stderr.log:

[2020-02-28 14:37:57+0100] ERROR bootchecks - An error occured while updating ncf techniques: Failure getting techniques from ncf api: code 500: {
  "error": [
    {
      "details": "Cause: 'ascii' codec can't decode byte 0xc3 in position 6883: ordinal not in range(128)\nTraceback (most recent call last):\n  File \"/usr/share/ncf/api/ncf_api_flask_app/views.py\", line 118, in get_techniques\n    techniques = ncf.get_all_techniques_metadata(True,migration)\n  File \"/usr/share/ncf/tools/ncf.py\", line 443, in get_all_techniques_metadata\n    method_calls = parse_technique_methods(file, methods)\n  File \"/usr/share/ncf/tools/ncf.py\", line 322, in parse_technique_methods\n    out = check_output([CFENGINE_PATH, \"-pjson\", \"-f\", technique_file], env=env)\n  File \"/usr/share/ncf/tools/ncf.py\", line 80, in check_output\n    output, error = process.communicate()\n  File \"/usr/lib/python3.5/subprocess.py\", line 801, in communicate\n    stdout, stderr = self._communicate(input, endtime, timeout)\n  File \"/usr/lib/python3.5/subprocess.py\", line 1485, in _communicate\n    self.stdout.encoding)\n  File \"/usr/lib/python3.5/subprocess.py\", line 705, in _translate_newlines\n    data = data.decode(encoding)\nUnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 6883: ordinal not in range(128)\n",
      "message": "Unknown internal error during techniques fetching" 
    }
  ]
}

Workaround:
- edit /usr/share/ncf/tools/ncf.py line 79 and 80 with the patch in pull request,
- service apache2 restart
- touch /opt/rudder/etc/force_ncf_technique_update
- service rudder-jetty restart