## REPOSITORY LAYOUT:
# foo
/
	/pillar
		/foo
			init.sls
# bar
/
	/pillar
		/bar
			init.sls

## master config
ext_pillar:
  - git:
    - develop git@my-super-awesome-and-verified-correct-url:project/foo.git
      - root: pillar
      - env: base
  - git:
    - master git@my-super-awesome-and-verified-correct-url:project/bar.git
      - root: pillar
      - env: base

## pillar top.sls
'*':
  base:
    'G@grain:value':
      - foo
      - bar

# result
- foo: everything is fine
- bar: "Specified SLS 'bar' in environment 'base' is not available on the salt master"