prereqs.sh

declare -a PRE_REQ_URLS
PRE_REQ_URLS=(
https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/m/makeself-2.2.0-3.el7.noarch.rpm
http://mirror.centos.org/centos/8/PowerTools/x86_64/os/Packages/tpm2-abrmd-devel-2.1.1-3.el8.x86_64.rpm 
http://mirror.centos.org/centos/8/PowerTools/x86_64/os/Packages/trousers-devel-0.3.14-4.el8.x86_64.rpm
https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.10-3.2.el7.x86_64.rpm
)

declare -a PRE_REQ_PACKAGES
PRE_REQ_PACKAGES=(
makeself-2.2.0-3.el7.noarch.rpm
tpm2-abrmd-devel-2.1.1-3.el8.x86_64.rpm
trousers-devel-0.3.14-4.el8.x86_64.rpm
containerd.io-1.2.10-3.2.el7.x86_64.rpm
docker-ce-19.03.5
wget
gcc
gcc-c++
ant
git
patch
zip
unzip
java-1.8.0-openjdk-devel.x86_64
make
tpm2-tss-2.0.0-4.el8.x86_64
tpm2-abrmd-2.1.1-3.el8.x86_64
openssl-devel
)

#download pre-reqs
download_prereqs() {
  local error_code=0
  dnf install -y yum-utils
  yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
  for url in ${!PRE_REQ_URLS[@]}; do
    local package_url=${PRE_REQ_URLS[${url}]}
    wget --no-check-certificate ${package_url}
    local return_code=$?
    if [ ${return_code} -ne 0 ]; then
      echo "ERROR: could not download [${package_url}]"
      return ${return_code}
    fi
  done
 
  return ${error_code}
}

#install pre-reqs
install_prereqs() {
  local error_code=0

  for package in ${!PRE_REQ_PACKAGES[@]}; do
    local package_name=${PRE_REQ_PACKAGES[${package}]}
    dnf install -y ${package_name}
    local return_code=$?
    if [ ${return_code} -ne 0 ]; then
      echo "ERROR: could not install [${package_name}]"
      return ${return_code}
    fi
  done
   
  systemctl daemon-reload         
  systemctl enable docker.service 
  systemctl restart docker.service

  return ${error_code}
}


# functions handling i/o on command line
print_help() {
        echo "Usage: $0 [-his]"
    echo "    -h    print help and exit"
    echo "    -s    pre-req setup"
}

dispatch_works() {
    mkdir ~/.tmp
    if [[ $1 = *"s"* ]] ; then
        download_prereqs
        install_prereqs
    fi
}

if [ $# -eq 0 ] ; then
    print_help
    exit 1
fi

OPTIND=1
work_list=""
while getopts his opt; do
    case ${opt} in
    h)  print_help; exit 0 ;;
    s)  work_list+="s" ;;
    *)  print_help; exit 1 ;;
    esac
done

# run commands
dispatch_works $work_list