file_roots:
  base:
    - /srv/salt
  env1:
    - /srv/salt/env1

.
├── base
├── env1
│   └── domain1
│       ├── init.sls
│       └── nginx.conf
└── top.sls

env1:
  '*':
    - env1.domain1

/etc/nginx/nginx.conf:
  file.managed:
      - source: salt://env1/domain1/nginx.conf

salt '*' state.sls env1.domain1

# salt '*' state.highstate
myHost:
    Data failed to compile:
----------
    No matching sls found for 'env1.domain1' in env 'env1'

- source: salt://domain1/nginx.conf

- source: salt://env1/domain1/nginx.conf

Comment: Source file salt://domain1/nginx.conf not found

file_roots:
  base:
    - /srv/salt/base
  env1:
    - /srv/salt/env1

.
├── base
│   └── init.sls
├── conf_template
├── env1
│   └── domain1
│       ├── init.sls
│       └── nginx.conf
└── top.sls

base:
  '*':
    - init
env1:
  '*':
    - domain1

/etc/nginx/nginx.conf:
  file.managed:
      - source: salt://domain1/nginx.conf

salt '*' state.sls env1.domain1
myHost:
    Data failed to compile:
----------
    No matching sls found for 'env1.domain1' in env 'base'

env1:
  '*':
    - domain1