Cannot use apache::mod::prefork with apache::mod::php

[xchotard-talentsoft]

Describe the Bug

Try to pass custom configuration to mpm_prefork, using the apache::mod::prefork class with arguments fails if apache::mod::php is also used.

Expected Behavior

It should be possible to customize mpm_prefork regardless of php status.

Steps to Reproduce

Code example 1:

class { 'apache':
  mpm_module => 'prefork',
}

class { 'apache::mod::php': }

class { 'apache::mod::prefork':
  maxspareservers => 20,
}

Returns an error (short version):

Duplicate declaration: Class[Apache::Mod::Prefork] is already declared; cannot redeclare

Code example 2:

class { 'apache': }

class { 'apache::mod::php': }

class { 'apache::mod::prefork':
  maxspareservers => 20,
}

Also returns an error (short version):

apache::mod::php requires apache::mod::prefork or apache::mod::itk; please enable mpm_module => 'prefork' or mpm_module => 'itk' on Class['apache']

According to REFERENCE.md, the mpm_module parameter must be set to false, in order to be able to use apache::mod::prefork:

class { 'apache':
  mpm_module => false,
}

class { 'apache::mod::php': }

class { 'apache::mod::prefork':
  maxspareservers     => 20,
}

But this does not seems to work either:

apache::mod::php requires apache::mod::prefork or apache::mod::itk; please enable mpm_module => 'prefork' or mpm_module => 'itk' on Class['apache']

Environment

• Version: main (currently 8.1.0)
• Puppet version: 6.28.0-1focal
• Platform: Ubuntu 20.04

Additional Context

Add any other context about the problem here.

[ekohl]

I think the only option is to use Hiera:

include apache
include apache::mod::php

Then use Hiera:

apache::mpm_module: prefork
apache::mod::prefork::maxspareservers: 20

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