installing all things for ubuntu script

ubuntu-install.sh

#!/usr/bin/env bash

set -exuo pipefail

##################################################
### Variables
## apt
apt_repos=(
  'ppa:kgilmer/regolith-stable' # https://blog.elreydetoda.site/minimal-i3-gaps-install-ubuntu/
  'ppa:linuxuprising/shutter' # awesome screenshotting software
  'ppa:erigas/cpupower-gui'
)

unsupported_ppas_2020=(
  'regolith'
  'shutter'
  'cpupower'
)

apt_pkgs=(
  'i3-gaps' # preferred working desktop
  'rxvt-unicode-256color' # preferred terminal (because of customizations I have)
  'remmina-plugin-spice' # used for libvirt stuff
  'remmina-plugin-nx' # used for nomachine stuff
  'nmap' # because pentesting & sysadmining...
  'curl' # super useful for scripts
  'feh' # for changing backgrounds
  'build-essential' # for building tools
  'autoconf' # for building tools
  'glances' # very good sys mon tool
  'htop' # very good sys mon tool
  #'shutter' # really good screenshot util ( TODO: doesn't work on 20.04)
  'shellcheck' # awsome shell-linter
  'vim-gtk3' # preferred vim because clipboard support
  'vagrant' # tool for automating vms (I love this tool :D)
  'cpupower-gui' # tool for adjusting cpu power manually
  'tmux'
  'gufw' # gui interface for ufw
  'virtualbox-qt'
  'virtualbox-ext-pack'
  'speedtest-cli'
 )

# command used to generate list on already installed computer
# snap list | grep -v classic | cut -d ' ' -f 1 | grep -vP 'gnome|kde|gtk|^core' | tail -n+2 | clipcopy
snap_pkgs=(
  # 'authy' TODO: need to create a beta array
  'bitwarden'
  'chromium'
  'discord'
  'docker'
  'doctl'
  'electronplayer'
  'gitter-desktop'
  'irccloud'
  'irssi'
  'kteatime'
  'obs-studio'
  'onlyoffice-desktopeditors'
  'postman'
  'riot-web'
  'signal-desktop'
  'simplenote'
  'spotify'
  'wire'
  'zulip'
)

# command used to generate list on already installed computer
# snap list | grep classic | cut -d ' ' -f 1 | grep -vP 'gnome|kde|gtk|mate|boutique$|^core' | tail -n+2 | clipcopy
snap_classic_pkgs=(
  'fwupd'
  'go'
  'hub'
  'multipass'
  'powershell'
  'skype'
  'slack'
)

## system
current_release="$(lsb_release -r | cut -f 2 | tr -d '.')"

##################################################
## functions
# system config changes
function sys_changes(){
  net_manager
}

# NetworkManager
function net_manager(){
  # enable mac address randomization on a per boot cadence
  sudo tee /etc/NetworkManager/conf.d/30-anon.conf << 'EOF'
# https://elrey.casa/info/netman
[device-anon]
wifi.scan-rand-mac-address=yes

[connection-anon]
connection.stable-id='${CONNECTION}/${BOOT}'
ethernet.cloned-mac-address=stable
wifi.cloned-mac-address=stable
ipv6.ip6-privacy=2
EOF
sudo systemctl restart NetworkManager
}

# looping over arrays
function loop_array(){
  for thing in ${2} ; do
    sudo "${1}" "${thing}"
  done
}

function currently_supported(){

  case "${current_release}" in
    2004)
      un_supported=1
      ;;
  esac
}

function 2004_specific(){
  # this is hacking till it is official
  current_alteration="${1}"
  extra="${2}"
  case "${current_alteration[@]}" in
    apt)
      comparison_string="$( echo "${unsupported_ppas_2020[@]}" | tr ' ' '|' )"
      if printf '%s'  "${extra}" | grep -P  "${comparison_string}" - 1>/dev/null ; then
          apt_ppa_conv="$(printf '%s' "${extra}" | cut -d ':' -f 2 | sed 's,/,-ubuntu-,')"
          apt_source_file="/etc/apt/sources.list.d/${apt_ppa_conv}-$(lsb_release -c | cut -f 2).list"
          # swapping focal to eoan (they are close enough :D) and don't hate me...
          sudo sed -i.save 's/focal/eoan/g' "${apt_source_file}"
          sudo mv "${apt_source_file}" "$(printf '%s' "${apt_source_file}" | sed 's/focal/eoan/g')"
        else
          return 0
      fi
  esac
}

function enable_src_repos(){
  sed 's/^# deb-src/deb-src/' /etc/apt/sources.list | grep deb-src | sudo tee /etc/apt/sources.list.d/sources-src.list
}

##################################################

function main(){

  currently_supported

  # installing all extra repos
  for repo in "${apt_repos[@]}" ; do
    if [[ -n "${un_supported}" ]] ; then
      sudo add-apt-repository -ny "${repo}"
      eval "${current_release}_specific" 'apt' "${repo}"
      sudo apt update
    else
      sudo add-apt-repository -y "${repo}"
    fi
  done
  
  # installing all apt packages
  sudo apt install -y "${apt_pkgs[@]}"
  
  # installing all snap packages
  # TODO: handle when all snaps are installed w/if statement
  sudo snap install "${snap_pkgs[@]}"

  # installing all classic snap packages
  for classic_snap in "${snap_classic_pkgs[@]}" ; do
    sudo snap install "${classic_snap}" --classic 
  done

  enable_src_repos

  sys_changes

}

main "${@}"