Universal Installer Rev. 1

This is an attempt at a universal installer script in bash. The goal of the script is to determine the underlying OS and then run a set of functions based on the specific operating system. This is very much a version 1 type of script that I will be tweaking in later posts:

#!/usr/bin/env bash
#set -o nounset
#set -o errexit

############ [ VARIABLES ] ############
dt=$(date +"%b-%d-%y")
d_dir="$HOME/Deployment"
hst=$(hostname)
#######################################

if [ ! -d "$d_dir" ]
then
mkdir -p "$d_dir"
fi

# Start logging
echo "Server Post Provisioning Results:"$'\n' > "$dt.$hst.log"

os() {
if [ -e /etc/redhat-release ]
  then
    os="centos"
elif [ -e /etc/lsb-release ]
  then
   os="ubuntu"
elif [ -e /etc/arch-release ]
  then
    os="arch"
elif [ -e /var/log/installer/lsb-release ]
  then
    os="debian"
fi
}

base_setup() {
  case "$os" in
    "Centos" | "centos" )
        os_ver=$(cat /etc/redhat-release)
        echo "$os_ver" >> "$dt.$hst.log"
        yum update -y && yum upgrade -y
        yum install screen curl wget jwhois bind-utils samba samba-client make gcc git -y
  ;;
    "Ubuntu" | "ubuntu" )
        os_ver=$(lsb_release -r|grep Release|awk '{print $2}'|cut -d '.' -f1)
        echo "System is running Ubuntu '$os_ver'" >> "$dt.$hst.log"
        apt-get update && apt-get upgrade -y && apt-get install curl git -y
  ;;
    "Arch" | "arch" )
        os_ver=$(cat < /etc/issue|awk '{print $1,$2 }')
        echo "$os_ver" >> "$dt.$hst.log"
        pacman -Syu --noconfirm
        pacman -S screen curl git wget fakeroot make gcc python dnsutils --noconfirm
  ;;
    "Debian" | "debian" )
        os_ver=$(cat /etc/debian_version)
        echo "$os_ver" >> "$dt.$hst.log"
        apt-get update && apt-get upgrade -y
        apt-get install screen sudo wget jwhois git lsof nano curl sendmail mailutils -y
  ;;
  esac
}

## Grab all needed files from github
grab_files() {
    cd "$d_dir"
    git clone https://github.com/greyhound-forty/Post_Install.git
    git clone https://github.com/greyhound-forty/Configuration-Files.git
}

update_system() {
  case "$os_ver" in
    "Centos" | "centos" )
        chmod +x "$d_dir/Post_Install/centos-6-post-install-script.sh"
        screen -S Centos -d -m /bin/bash "$d_dir/Post_Install/centos-6-post-install-script.sh"
  ;;
    "12" )
        chmod +x "$d_dir/Post_Install/ubuntu-12-post-install-script.sh"
        echo "screen -S testing -d -m /bin/bash '$d_dir/Post_Install/ubuntu-12-post-install-script.sh'" >> "$dt.$hst.log"
  ;;
    "14" )
        chmod +x "$d_dir/Post_Install/ubuntu-14-post-install-script.sh"
        echo "screen -S testing -d -m /bin/bash '$d_dir/Post_Install/ubuntu-14-post-install-script.sh'" >> "$dt.$hst.log"
  ;;
    "Debian" | "debian" )
        chmod +x "$d_dir/Post_Install/debian-7-post-install-script.sh"
        screen -S testing -d -m /bin/bash "$d_dir/Post_Install/debian-7-post-install-script.sh"
  ;;
    "Arch" | "arch" )
        chmod +x "$d_dir/Post_Install/arch-post-install-script.sh"
        screen -S Arch -d -m /bin/bash "$d_dir/Post_Install/arch-post-install-script.sh"
  ;;
  esac
}

os;
base_setup;
grab_files;
update_system;