puppet.conf

[main]
# generic puppet variables
vardir = /var/lib/puppet
ssldir = $vardir/ssl
# .. etc

[master]
# setting for dynamic environments
manifest = /etc/puppet/environments/$environment/manifests/site.pp
modulepath = /etc/puppet/environments/$environment/modules:/etc/puppet/environments/global/modules

[specialenv]
# this is a 'concrete' environment stanza, has different settings than dynamic envs
manifest = /tmp/special/environment/manifests/mymanifest.pp
modulepath = /tmp/special/environment/modules