puppetlabs/vcsrepo git submodule update without exec

edit

Looking for a better way to update a git submodule using the puppetlabs/vcsrepo module.

Using a (ops-maintained) git repo for puppet files in /etc/puppetlabs/puppet, and a (dev-maintained) submodule in /etc/puppetlabs/puppet/files/appconf.

The following is written to use a submodule, but using exec seems like a kludge.

  vcsrepo { '/etc/puppetlabs/puppet/':
    ensure   => latest,
    user     => $username,
    provider => git,
    require  => [ Package["git"] ],
    source   => "git@git.mydomain.com:${repo}.git",
    revision => 'master',
  }
  ->
  exec { '/usr/bin/git submodule init':
    cwd => '/etc/puppetlabs/puppet',
  }
  ->
  exec { '/usr/bin/git submodule update':
    cwd => '/etc/puppetlabs/puppet',
  }

Thanks!

-s