gistfile1.txt

class filesystems {
    file { "/etc/exports.d":
        ensure => directory,
        purge => true,
        notify => Exec[rebuild-exports]
    }

    exec { rebuild-exports:
        command => "/bin/cat /etc/exports.d/* > /etc/exports",
        refreshonly => true
    }

    define export($path,$options,$servers) {
        file { "/etc/exports.d/$name":
            # This template is left as an exercise to the reader
            content => template("exports/export.erb"),
            ensure => file,
            notify => Exec[rebuild-exports]
        }
    }
}

class mystuff {
    filesystems::export { "homes":
        path => "/srv/homes",
        options => [rw,sync,no_subtree_check],
        servers => [hostname1, hostname2]
    }
}

class otherstuff inherits mystuff {
    Filesystems::Export["homes"] { servers +> hostname3 }
}