dotfiles/modules/config/manifests/git.pp

class config::git {
  $global_gitignore = '/home/jake/.config/.gitignore'

  file { $global_gitignore:
    ensure => file,
    mode => '0644',
    source => 'puppet:///modules/config/gitignore_global'
  }

  -> exec { "install global git config":
    command => "git config --global core.excludesfile '$global_gitignore'",
    user => 'jake',
    unless => 'git config --global core.excludesfile'
  }
}