Install systemd-networkd package, if any

On Red Hat systems networkd is packaged as systemd-networkd. In
particular:

* EL7
* EL8/EL9 shipped in EPEL
* Fedora since 33

REFERENCE.md

@@ -102,6 +102,7 @@ The following parameters are available in the `systemd` class:
 * [`use_stub_resolver`](#-systemd--use_stub_resolver)
 * [`manage_networkd`](#-systemd--manage_networkd)
 * [`networkd_ensure`](#-systemd--networkd_ensure)
+* [`networkd_package`](#-systemd--networkd_package)
 * [`manage_timesyncd`](#-systemd--manage_timesyncd)
 * [`timesyncd_ensure`](#-systemd--timesyncd_ensure)
 * [`timesyncd_package`](#-systemd--timesyncd_package)
@@ -330,6 +331,14 @@ The state that the ``networkd`` service should be in
 
 Default value: `'running'`
 
+##### <a name="-systemd--networkd_package"></a>`networkd_package`
+
+Data type: `Optional[String[1]]`
+
+Name of the package required for systemd-networkd, if any
+
+Default value: `undef`
+
 ##### <a name="-systemd--manage_timesyncd"></a>`manage_timesyncd`
 
 Data type: `Boolean`

data/RedHat-family.yaml

@@ -0,0 +1,2 @@
+---
+systemd::networkd_package: systemd-networkd

manifests/init.pp

@@ -83,6 +83,9 @@
 # @param networkd_ensure
 #   The state that the ``networkd`` service should be in
 #
+# @param networkd_package
+#   Name of the package required for systemd-networkd, if any
+#
 # @param manage_timesyncd
 #   Manage the systemd timesyncd daemon
 #
@@ -205,6 +208,7 @@
   Boolean                                             $use_stub_resolver = false,
   Boolean                                             $manage_networkd = false,
   Enum['stopped','running']                           $networkd_ensure = 'running',
+  Optional[String[1]]                                 $networkd_package = undef,
   Boolean                                             $manage_timesyncd = false,
   Enum['stopped','running']                           $timesyncd_ensure = 'running',
   Optional[String[1]]                                 $timesyncd_package = undef,
@@ -285,6 +289,7 @@
 
   if $manage_networkd and $facts['systemd_internal_services'] and $facts['systemd_internal_services']['systemd-networkd.service'] {
     contain systemd::networkd
+    Class['systemd::install'] -> Class['systemd::networkd']
   }
 
   if $manage_timesyncd and $facts['systemd_internal_services'] and $facts['systemd_internal_services']['systemd-timesyncd.service'] {

manifests/install.pp

@@ -2,6 +2,12 @@
 # @api private
 #
 class systemd::install {
+  if $systemd::manage_networkd and $systemd::networkd_package {
+    package { $systemd::networkd_package:
+      ensure => present,
+    }
+  }
+
   if $systemd::manage_resolved and $systemd::resolved_package {
     package { $systemd::resolved_package:
       ensure => present,

spec/acceptance/networkd_spec.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require 'spec_helper_acceptance'
+
+describe 'systemd with manage_networkd true' do
+  has_package = fact('os.family') == 'RedHat'
+
+  # On Enterprise Linux 8 & 9 the package is shipped in EPEL
+  before { install_package(default, 'epel-release') if has_package && %w[8 9].include?(fact('os.release.major')) }
+
+  context 'configure systemd-networkd' do
+    let(:manifest) do
+      <<~PUPPET
+        class { 'systemd':
+          manage_networkd => true,
+        }
+      PUPPET
+    end
+
+    it 'works idempotently with no errors' do
+      apply_manifest(manifest, catch_failures: true)
+      # Package systemd-networkd needs to be installed before fact $facts['internal_services'] is set
+      apply_manifest(manifest, catch_failures: true) if has_package
+      apply_manifest(manifest, catch_changes: true)
+    end
+
+    describe service('systemd-networkd') do
+      it { is_expected.to be_running }
+      it { is_expected.to be_enabled }
+    end
+
+    it { expect(package('systemd-networkd')).to be_installed } if has_package
+  end
+
+  context 'configure systemd stopped' do
+    let(:manifest) do
+      <<~PUPPET
+        class { 'systemd':
+          manage_networkd => true,
+          networkd_ensure => 'stopped',
+        }
+      PUPPET
+    end
+
+    it 'works idempotently with no errors' do
+      apply_manifest(manifest, catch_failures: true)
+      apply_manifest(manifest, catch_changes: true)
+    end
+
+    describe service('systemd-networkd') do
+      it { is_expected.not_to be_running }
+      it { is_expected.not_to be_enabled }
+    end
+  end
+end

spec/classes/init_spec.rb

@@ -17,6 +17,7 @@
         it { is_expected.not_to create_service('systemd-resolved') }
         it { is_expected.not_to create_service('systemd-networkd') }
         it { is_expected.not_to create_service('systemd-timesyncd') }
+        it { is_expected.not_to contain_package('systemd-networkd') }
         it { is_expected.not_to contain_package('systemd-timesyncd') }
         it { is_expected.not_to contain_package('systemd-resolved') }
         it { is_expected.not_to contain_class('systemd::coredump') }
@@ -39,6 +40,12 @@
           it { is_expected.to create_service('systemd-networkd').with_enable(true) }
           it { is_expected.not_to contain_file('/etc/systemd/network') }
 
+          if facts[:os]['family'] == 'RedHat'
+            it { is_expected.to contain_package('systemd-networkd') }
+          else
+            it { is_expected.not_to contain_package('systemd-networkd') }
+          end
+
           case [facts[:os]['family'], facts[:os]['release']['major']]
           when %w[RedHat 7], %w[RedHat 9]
             it { is_expected.to contain_package('systemd-resolved') }