aix_reload-examples-test.pp

# <modulepath>/aix_reload/examples/test.pp
user { 'newuser007':
  ensure   => present,
  provider => aix_reload,
  before   => Notify['foo'],
}

notify { 'foo': }

aix_reload-lib-puppet-provider-user-aix_reload.rb

# <modulepath>/aix_reload/lib/puppet/provider/user/aix_reload.rb
Puppet::Type.type(:user).provide(:aix_reload, :parent => :aix, :source => :aix) do
  
  # To fully duplicate and encompass the behavior of the parent provider, we need to manually
  # ingest a bit of it.
  [:@checks, :@commands, :@confine_collection, :@declared_features, :@options].each do |var|
    instance_variable_set(var, Puppet::Type::User.provider(:aix).instance_variable_get(var))
  end
  
  def create
    super
    Puppet::Application.stop!
    pid = Process.pid
    at_exit { system '/opt/puppetlabs/bin/puppet agent -t </dev/null >/dev/null 2>&1 &' if Process.pid == pid }
  end
end

site.pp

# site.pp
case $facts['os']['name']
  # I don't know if the capitalization here is right; I don't have an AIX box handy
  # to test
  'aix': {
    # By putting this in site.pp, any user resource that doesn't specify a provider
    # will use the one specified here by default.
    User {
      provider => aix_reload,
    }
  }
  default: {
    # intentionally left empty
  }
}