python_release.rb

# Make python release available as facts

def get_python_release(executable)
  if Facter::Util::Resolution.which(executable) # rubocop:disable Style/GuardClause
    results = Facter::Util::Resolution.exec("#{executable} -V 2>&1").match(%r{^.*(\d+\.\d+)\.\d+\+?(?:rc\d+)?$})
    results[1] if results
  end
end

Facter.add('python_release') do
  setcode do
    get_python_release 'python'
  end
end

Facter.add('python2_release') do
  setcode do
    default_release = get_python_release 'python'
    if default_release.nil? || !default_release.start_with?('2')
      get_python_release 'python2'
    else
      default_release
    end
  end
end

Facter.add('python3_release') do
  setcode do
    get_python_release 'python3'
  end
end