Add ansible to rhel (#105)

- Moves RSHM registration to the kickstart
- Moves installation of the EPEL repository to the kickstart
- Updates provisioner script to check RHSM (via refresh) before installing additional packages.

Related Issue: #54

builds/linux/redhat-linux-8/data/ks.pkrtpl.hcl

@@ -24,7 +24,10 @@ reboot
 %end
 
 %post
-yum install -y sudo open-vm-tools perl
+/usr/sbin/subscription-manager register --username ${rhsm_username} --password ${rhsm_password} --autosubscribe --force
+dnf install -y -q https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
+dnf makecache
+dnf install -y sudo open-vm-tools perl ansible
 echo "${build_username} ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers.d/${build_username}
 sed -i "s/^.*requiretty/#Defaults requiretty/" /etc/sudoers
 %end

builds/linux/redhat-linux-8/linux-redhat-linux.pkr.hcl

@@ -26,6 +26,8 @@ locals {
     "/ks.cfg" = templatefile("${abspath(path.root)}/data/ks.pkrtpl.hcl", {
       build_username           = var.build_username
       build_password_encrypted = var.build_password_encrypted
+      rhsm_username            = var.rhsm_username
+      rhsm_password            = var.rhsm_password
       vm_guest_os_language     = var.vm_guest_os_language
       vm_guest_os_keyboard     = var.vm_guest_os_keyboard
       vm_guest_os_timezone     = var.vm_guest_os_timezone

scripts/linux/redhat-linux.sh

@@ -11,20 +11,17 @@ export BUILD_USERNAME
 export BUILD_KEY
 export ANSIBLE_USERNAME
 export ANSIBLE_KEY
-export RHSM_USERNAME
-export RHSM_PASSWORD
 
-#### Register Red Hat Subscription Manager to enable updates. ###
-echo '> Registering Red Hat Subscription Manager to enable updates ...'
-subscription-manager register --username $RHSM_USERNAME --password $RHSM_PASSWORD --auto-attach
+#### Checking Red Hat Subscription Manager status. ###
+echo '> Checking the Red Hat Subscription Manager status ...'
+subscription-manager refresh
 
 #### Update the guest operating system. ###
 echo '> Updating the guest operating system ...'
 sudo dnf update -y
 
 ### Install additional packages. ### 
 echo '> Installing additional packages ...'
-sudo dnf install -y -q https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
 sudo dnf install -y \
     curl \
     wget \