hiera 4 config syntax assuming environmentpath ?

_ hiera debug output.txt

$ hiera --debug --config hiera.yaml message
DEBUG: 2016-11-08 08:58:08 +1100: Hiera YAML backend starting
DEBUG: 2016-11-08 08:58:08 +1100: Looking up message in YAML backend
DEBUG: 2016-11-08 08:58:08 +1100: Looking for data source common
DEBUG: 2016-11-08 08:58:08 +1100: Cannot find datafile /etc/puppetlabs/code/environments//hieradata/common.yaml, skipping
nil

$ ls -ld hiera.yaml
-rw-r--r--  1 jesse  staff  245  7 Nov 10:16 hiera.yaml
p

$ ls -ld hieradata/common.yaml
-rw-r--r--  1 jesse  staff  126  7 Nov 10:16 hieradata/common.yaml

What about with puppet lookup ? How do you tell puppet lookup to use a particular hiera.yaml file? 

$ puppet lookup --hiera_config hiera.yaml --configprint hiera_config
/Users/jesse/src/puppet/foo/puppet/hiera.yaml

I've raised https://tickets.puppetlabs.com/browse/PUP-6899 about this. 

hiera.yaml

---
version: 4
datadir: hieradata

hierachy:
  - name: "nodes/%{::fqdn}"
    backend: yaml
  - name: "environment/%{::cf_dc}/%{::cf_vsys}"
    backend: yaml
  - name: "environment/%{::cf_dc}"
    backend: yaml
  - name: common
    backend: yaml