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/*

== Definition: augeas::lens

Deploy an Augeas lens (and its test file).
Check the lens (and run the unit tests) automatically and remove the files if
the checks fail.

Parameters:
- *ensure*: present/absent
- *lens_source*: the source for the lens
- *test_source*: optionally, the source for the test file.

Example usage:

  augeas::lens { 'networkmanager':
    lens_source => 'puppet:///modules/networkmanager/lenses/networkmanager.aug',
    test_source => 'puppet:///modules/networkmanager/lenses/test_networkmanager.aug',
  }

*/

define augeas::lens (
  $lens_source,
  $ensure=present,
  $test_source=false
) {

  include augeas::base

  $lens_dest = "${augeas::base::lens_dir}/${name}.aug"
  $test_dest = "${augeas::base::lens_dir}/tests/test_${name}.aug"

  file { $lens_dest:
    ensure => $ensure,
    source => $lens_source,
  }

  exec { "Typecheck lens ${name}":
    command     => "augparse -I ${augeas::base::lens_dir} ${lens_dest} || (rm -f ${lens_dest} && exit 1)",
    refreshonly => true,
    subscribe   => File[$lens_dest],
  }

  if $test_source {
    file { $test_dest:
      ensure => $ensure,
      source => $test_source,
      notify => Exec["Test lens ${name}"],
    }

    exec { "Test lens ${name}":
      command     => "augparse -I ${augeas::base::lens_dir} ${test_dest} || (rm -f ${lens_dest} && rm -f ${test_dest} && exit 1)",
      refreshonly => true,
      subscribe   => File[$lens_dest, $test_dest],
    }
  }
}