RHEL7 support (#1530)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

lib/pharos/host/el7/centos7.rb

@@ -16,10 +16,6 @@ class Centos7 < El7
         name: 'cfssl', version: CFSSL_VERSION, license: 'MIT',
         enabled: proc { |c| !c.etcd&.endpoints }
       )
-
-      def docker_repo_name
-        'extras'
-      end
     end
   end
 end

lib/pharos/host/el7/el7.rb

@@ -3,7 +3,7 @@
 module Pharos
   module Host
     class El7 < Configurer
-      DOCKER_VERSION = '19.03.6'
+      DOCKER_VERSION = '19.03.8'
       CFSSL_VERSION = '1.2'
 
       # @param path [Array]
@@ -78,7 +78,6 @@ def configure_container_runtime
           exec_script(
             'configure-docker.sh',
             DOCKER_VERSION: DOCKER_VERSION,
-            DOCKER_REPO_NAME: docker_repo_name,
             INSECURE_REGISTRIES: insecure_registries
           )
         elsif custom_docker?

lib/pharos/host/el7/rhel7.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative 'el7'
+
+module Pharos
+  module Host
+    class Rhel7 < El7
+      register_config 'rhel', '7.4'
+      register_config 'rhel', '7.5'
+      register_config 'rhel', '7.6'
+      register_config 'rhel', '7.7'
+      register_config 'rhel', '7.8'
+
+      register_component(
+        name: 'docker', version: DOCKER_VERSION, license: 'Apache License 2.0',
+        enabled: proc { |c| c.hosts.any? { |h| h.container_runtime == 'docker' } }
+      )
+
+      register_component(
+        name: 'cfssl', version: CFSSL_VERSION, license: 'MIT',
+        enabled: proc { |c| !c.etcd&.endpoints }
+      )
+    end
+  end
+end

lib/pharos/host/el7/scripts/configure-essentials.sh

@@ -20,10 +20,20 @@ yum_install_with_lock() {
 EOF
 chmod +x /usr/local/share/pharos/el7.sh
 
+if ! rpm -qi yum-utils ; then
+    yum install -y yum-utils
+fi
+
 if ! rpm -qi yum-plugin-versionlock ; then
     yum install -y yum-plugin-versionlock
 fi
 
+if [ -f "/etc/centos-release" ]; then
+  yum-config-manager --enable extras
+else
+  subscription-manager repos --enable=rhel-7-server-extras-rpms
+fi
+
 if ! rpm -qi chrony ; then
     yum install -y chrony
     systemctl enable chronyd