Unable to contain apt::update

[olavmo-sikt]

Use Case

I want a class that configures an APT repository to also ensure that apt-get update has run before any dependencies on that class. This way I can depend on the class that configures the repository without needing to know how this repository is configured. E.g.:

class mymod::repository {
  if $facts['os']['family'] == 'Debian' {
    apt::source { 'somerepo':
      ...
    }
    contain apt::update
  } else {...}
}

class mymod {
  require mymod::repository # Make sure that the repository is configured and available.
  package { 'somepackage':
    ensure => 'present',
  }
}

This is currently not possible by using contain apt::source because that class is private. Instead if fails with:

error during compilation: Evaluation Error: Error while evaluating a Function Call, Class apt::update is private

Describe the Solution You Would Like

Since the apt::update class is a documented part of this module, I think it could be marked as public. That would allow it to be used both through contain and through direct dependencies (require => Class['apt::update']).

Describe Alternatives You've Considered

Two alternatives:

1. Using an anchor: `Class['apt::update'] -> anchor { 'mymod::repository::last' }'. The downside of this is that anchors are deprecated and no longer documented as part of containment.
2. Directly depending on `Class['apt::update'] in the package resource. This only works if the repository configured is always an APT repository

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