Populate a jinja variable in a configuration file.

populate.yaml

/srv/salt/populate/init.sls:

{% set host_name = grains['host'] -%}
testfile:
  file:
    - managed
    - name: /home/vagrant/testfile
    - source: salt://populate/testfile
    - template: jinja
    - defaults:
        name: {{ host_name }}

/srv/salt/populate/testfile:

This is a test-file that contains some stuff.
This is a jinja variable: {{ name }}