<0>root@blade214(24)~$ cat /etc/hiera.yaml
---
:backends:
           - yaml

:logger: console

:hierarchy:
            - "D:h=(%{hostname}),cm=(%{calling_module}),mn=(%{module_name}),cmn=(%{caller_module_name})"

:yaml:
   :datadir: /home/gitsync/puppet/%{environment}/hiera

<0>root@blade214(25)~$ puppet apply /tmp/t.pp --debug
Debug: hiera(): Hiera YAML backend starting
Debug: hiera(): Looking up foo in YAML backend
Debug: hiera(): Looking for data source D:h=(blade214),cm=(),mn=(),cmn=()
Debug: hiera(): Cannot find datafile /home/gitsync/puppet/production/hiera/D:h=(blade214),cm=(),mn=(),cmn=().yaml, skipping
Error: Could not find data item foo in any Hiera data file and no default supplied at /tmp/t.pp:2 on node blade214.non.3dart.com
Error: Could not find data item foo in any Hiera data file and no default supplied at /tmp/t.pp:2 on node blade214.non.3dart.com