python3 -m venv ./venv
source ./venv/bin/activate
pip install salt-ssh

# ./Saltfile
salt-ssh:
  roster_file: ./roster
  config_dir: .

# ./master
root_dir: .
cachedir: ./cachedir
top_file_merging_strategy: same

state_output_diff: True

fileserver_backend:
  - roots

file_roots:
  base:
    - ./states

module_dirs:
  - ./states

pillar_roots:
  base:
    - ./pillar

# ./roster
localhost:
  host: localhost
  user: vagrant
  minion_opts:
    grains:
      foo.grain: this is grains value foo.grain

# ./pillar/top.sls
base:
  '*':
    - all

# ./pillar/all.sls
foo.pillar: this is the pillar value foo.pillar

# ./states/_modules/foo.py
def pillar():
    return __salt__["config.option"]("foo.pillar", default="foo.pillar not found")

def grain():
    return __salt__["config.option"]("foo.grain", default="foo.grain not found")

# verify the pillar value
$ salt-ssh localhost pillar.get foo.pillar
localhost:
    this is the pillar value foo.pillar

# verify the grains value
$ salt-ssh localhost grains.get foo.grain
localhost:
    this is grains value foo.grain

# run config.option directly, successfully fetch the pillar value
$ salt-ssh localhost config.option foo.pillar
localhost:
    this is the pillar value foo.pillar

# run config.option directly, fail to fetch the grains value
$ salt-ssh localhost config.option foo.grain
localhost:

# call __salt__["config.option"] via module, fail to fetch the pillar value
$ salt-ssh localhost foo.pillar
localhost:
    foo.pillar not found

# call __salt__["config.option"] via module, successfully fetch the grains value
$ salt-ssh localhost foo.grain
localhost:
    this is grains value foo.grain