Templated yamlsettings example

README.md

A quick example to allow easy environment variable injection for yamlsettings in lists. Normally a list can only be completely overriden via environement variables, this allows you to pick specific values to load in to a given entry.

Run with something like:

BAR_PASS=s3cr3t BAZ_PASS=god python example.py

example.py

import os
import yamlsettings
from string import Template


def render_environ(path, node):
    """Callback for yamlsettings traverse to render all strings with
    environment values

    """
    if isinstance(node, str):
        return Template(node).substitute(**os.environ)
    else:
        return None


def main():
    settings = yamlsettings.load('settings.yaml')
    yamlsettings.update_from_env(settings)
    settings.traverse(render_environ)
    print(settings)


if __name__ == '__main__':
    main()

settings.yaml

---
foo: bar
bar_list:
  - name: foo bar
    secret: ${BAR_PASS}
  - name: baz bar
    secret: ${BAZ_PASS}