Check if the Mac hardware supports macOS 10.12

upgrade_check_10.12.sh

######################
# Check hardware model
######################
hwmodel=$(sysctl -n hw.model)
hwmodel_re='([[:alpha:]]*)([[:digit:]]*),([[:digit:]])'
if [[ $hwmodel =~ $hwmodel_re ]]; then
  hwmodel_name="${BASH_REMATCH[1]}"
  hwmodel_num="${BASH_REMATCH[2]}"
  hwmodel_rev="${BASH_REMATCH[3]}"
fi

# http://www.everymac.com/mac-answers/macos-sierra-faq/macos-sierra-1012-compatible-macs-system-requirements.html
# - iMac10,1
# - MacBook6,1
# - MacBookAir3,1
# - MacBookPro6,1
# - Macmini4,1
# - MacPro5,1

case "${hwmodel_name}" in
  iMac)
    min_hwmodel_num=10
    ;;
  MacBook)
    min_hwmodel_num=6
    ;;
  MacBookAir)
    min_hwmodel_num=3
    ;;
  MacBookPro)
    min_hwmodel_num=6
    ;;
  Macmini)
    min_hwmodel_num=4
    ;;
  MacPro)
    min_hwmodel_num=5
    ;;
  VMware)
    min_hwmodel_num=7
    ;;
esac

if (( ${hwmodel_num} >= ${min_hwmodel_num} )); then
  echo "Model Identifier: ${hwmodel}"
else
  echo "This computer does not meet the hardware model requirements for ${os_upgrade_name}. Quitting."
  exit 1
fi