test.sls

{# Define master lists #}
{% set master_default_path = "files/default/" ~ grains['os'] ~ "/" ~ grains['osmajorrelease'] ~ "/etc" %}
{% set master_custom_path = "files/custom/" ~ grains['os'] ~ "/" ~ grains['osmajorrelease'] ~ "/" ~ grains['id'] ~ "/etc" %}
{% set master_default_file_list = salt.cp.list_master(prefix=master_default_path) %}
{% set master_custom_file_list = salt.cp.list_master(prefix=master_custom_path) %}
{% set trimmed_custom_list = [] %}
{% set master_file_list = [] %}

{# Create master file list #}
{% for file_path in master_default_file_list %}
{% set relative_path = file_path.split('/')[4:]|join('/') %}
{% do master_file_list.append(relative_path) %}
{% endfor %}
{% for file_path in master_custom_file_list %}
{% set relative_path = file_path.split('/')[5:]|join('/') %}
{% do master_file_list.append(relative_path) %}
{% do trimmed_custom_list.append(relative_path) %}
{% endfor %}

{# Remove duplicates from master list (requires custom salt/utils/jinja.py until SaltStack Nitrogen #}
{% set final_list = master_file_list | unique %}

{# Iterate through master list, check for custom, and push to minion #}
{% for file_path in final_list %}
{% if file_path in trimmed_custom_list %}
{{ "custom_" ~ file_path }}:
{% else %}
{{ file_path }}:
{% endif %}
  file.managed:
    - name: {{ "/" ~ file_path }}
{% if file_path in trimmed_custom_list %}
    - source: salt://files/custom/{{ grains['os'] }}/{{ grains['osmajorrelease'] }}/{{ grains['id']  }}/{{ file_path }}
{% else %}
    - source: salt://files/default/{{ grains['os'] }}/{{ grains['osmajorrelease'] }}/{{ file_path }}
{% endif %}
    - mode: keep
{% endfor %}

{# Output to machine's /tmp for testing #}
/tmp/final.txt:
  file.managed:
    - contents: |
        {{ final_list }}