Add CentOS 8 support

Change-Id: I8eb7b1ce7cadc910386cfb8bf1d9b41194b2ecdd

defaults/main.yml

@@ -157,6 +157,8 @@ systemd_networkd_update_initramfs: "{{ _systemd_networkd_update_initramfs | defa
 
 systemd_networkd_distro_packages: "{{ _systemd_networkd_distro_packages | default([]) }}"
 
+systemd_networkd_epel_mirror: "{{ centos_epel_mirror | default('http://download.fedoraproject.org/pub/epel') }}"
+
 # The systemd networkd service can be used to set specific link configuration options.
 # For more information on all of the possible configuration see
 # https://www.freedesktop.org/software/systemd/man/systemd.link.html

tasks/main.yml

@@ -26,12 +26,30 @@
   tags:
     - always
 
+- name: Install the EPEL repository
+  yum_repository:
+    name: epel-networkd
+    baseurl: "{{ systemd_networkd_epel_mirror ~ '/' ~ ansible_distribution_major_version ~ '/Everything/' ~ ansible_architecture }}"
+    description: 'Extra Packages for Enterprise Linux $releasever - $basearch'
+    gpgcheck: yes
+    enabled: yes
+    state: present
+    includepkgs: 'systemd-networkd'
+  when:
+    - ansible_os_family | lower == 'redhat'
+    - ansible_distribution_major_version is version('8', '>=')
+  register: install_epel_repo
+  until: install_epel_repo  is success
+  retries: 5
+  delay: 2
+
 - name: Install networkd distro packages
   package:
     name: "{{ systemd_networkd_distro_packages }}"
     state: "present"
     update_cache: "{{ (ansible_pkg_mgr == 'apt') | ternary('yes', omit) }}"
     cache_valid_time: "{{ (ansible_pkg_mgr == 'apt') | ternary(600, omit) }}"
+    enablerepo: "{{ systemd_networkd_enablerepo | default(omit) }}"
   when:
     - systemd_networkd_distro_packages | length > 0
   register: install_packages

vars/redhat-8.yml

@@ -0,0 +1,23 @@
+---
+# Copyright 2020, VEXXHOST Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+_systemd_networkd_distro_packages:
+  - systemd-networkd
+
+_systemd_resolved_available: false
+
+_systemd_networkd_update_initramfs: "dracut -f"
+
+systemd_networkd_enablerepo: epel