#!/usr/bin/env bash
#------------------------------------------------------------------------------
#  PURPOSE: Moving from 'Classic' to RHSM (Red Hat Subscription Management
#           basically happens in 2 steps:
#             1) Registration: to RHSM
#             2) Subscription: to Virtual or Physical
#                a) Physical is for ESXi Servers (physical host systems)
#                b) Virtual  is for Guest VMs
#           We only care about Virtual subscriptions.
#           Classic is going away in 2017.
#           -------------------------------------------------------------------
#  AUTHORS: Todd E Thomas
#     DATE: 2015/06/23
# MODIFIED: 2015/08/10
#------------------------------------------------------------------------------
#set -x


###----------------------------------------------------------------------------
### VARIABLES
###----------------------------------------------------------------------------
# PREREQUISITES
#: ${backupDir?"required backup directory not set in environment"}
hostName="$(hostname -s)"
userName='RHEL_ACCESS_UN'
passWord='RHEL_ACCESS_PW'


###----------------------------------------------------------------------------
### FUNCTIONS
###----------------------------------------------------------------------------
#source "lib/start.sh"
#source "lib/finish.sh"
#source "lib/printfmsg.sh"


###---
### Reregister The System to RHSM (subscription manager)
###---
registerSystem() {
    printInfo "Registering $hostName with RHSM..."
    subscription-manager register --auto-attach --force --username "$userName" --password "$passWord"
}



###---
### Get Current Registration Status
### It's either: 'Unknown' or 'Current'
###---
registrationStatus() {
printInfo "Getting current registration status..."
subscriptStatus="$(subscription-manager status | grep 'Overall')"
subscriptStatus="${subscriptStatus##*:}"
if [[ "${subscriptStatus##*\ }" = 'Unknown' ]]; then
    # If System Status: Overall Status: Unknown
    registerSystem
else
    # continue to subscription
    printSStat "$hostName is already registered."
fi
}

###---
### Subscribe VM by linking it with a Pool ID
###---
susbscribeSystem() {
    printInfo "Subscribing to RHEL for Datacenters, Standard: Virtual"
    poolID="$(subscription-manager list --available | grep 'Virtual' -B7 | grep 'Pool')"
    poolID="${poolID##*:}"
    subscription-manager attach --pool="${poolID##*\ }"
}


###---
### Check for new updates
###---
checkSystemStatus() {
printInfo "Check for updates with new subscription..."
yum clean all
yum check-update
print1Line
# OUPTUT:
# Loaded plugins: product-id, rhnplugin, security, subscription-manager
}


###----------------------------------------------------------------------------
### MAIN PROGRAM
###----------------------------------------------------------------------------
### What time is it?
###---
start

printReq "Registration: Switching from Classic to RHSM..."


###---
### Get Program Status: subscription-manager
###---
if [[ ! -x "$(type -P subscription-manager)" ]]; then
    printInfo "Installing subscription-manager..."
    yum -y install subscription-manager
    print1Line
else
    printSStat "subscription-manager is installed"
fi


###---
### Get the Registration Status
###---
registrationStatus


###---
### Get Current Subscription Status
### It's either subscribed or it isn't.
###---
printInfo "Getting current subscription status..."
quantityNo="$(subscription-manager list --consumed | grep 'Quantity')"
quantityNo="${quantityNo##*:}"
if [[ "$quantityNo" -ne '1' ]]; then
    # If system is not subscribed
    susbscribeSystem
else
    printSStat "$hostName is already subscribed."
    subscription-manager list --consumed
    # Clean the RPM db and pull new data
    checkSystemStatus
fi

###---
### Get New Subscription Status
###---
printInfo "Refresh and get current subscription status..."
subscription-manager refresh
registrationStatus
# OUPTUT:
# +-------------------------------------------+
# System Status Details
# --------------------------------------------+
# Overall Status: Current


###---
### fin~
###---
finish
exit 0