Z09.NET

Build a Tiny Certificate Authority For Your Homelab
Carl Tashian

#!/bin/bash

# Clone a user and prvileges. I got most of my information from
# https://unix.stackexchange.com/questions/204970/clone-linux-user-copy-user-based-on-another-one

# New user and password
NEW_USER=
NEW_PASS=

# user to be cloned, $USER is the current user. 
SRC_USER=$USER

# get the groups the source user belongs to
SRC_GROUPS=$(id -Gn ${SRC_USER} | sed "s/ /,/g" | sed -r 's/\<'${SRC_USER}'\>\b,?//g')

# get the shell of the source user
# SRC_SHELL=$(awk -F : -v name=${SRC_USER} '(name == $1) { print $7 }' /etc/passwd)
# Rasbian defaults to bash, Ubuntu to sh. I like bash better.
SRC_SHELL='/bin/bash'

# create user then add the password
sudo useradd --groups ${SRC_GROUPS} --shell ${SRC_SHELL}  --create-home ${NEW_USER}
echo "${NEW_USER}:${NEW_PASS}" | sudo chpasswd

# The new user will be asked their password and I don't like that. This stops it.
echo | sudo EDITOR='tee -a' visudo
echo '# Stop asking for my password' | sudo EDITOR='tee -a' visudo
echo "${NEW_USER} ALL=(ALL) NOPASSWD: ALL" | sudo EDITOR='tee -a' visudo




# change the timezone and here are the common US zones
#            America/New_York 
#            America/Chicago 
#            America/Denver 
#            America/Los_Angeles 
sudo timedatectl set-timezone America/Detroit




# Gotta always do this
sudo apt update
sudo apt upgrade -y
sudo apt clean

# Raspbian doesn't have git and Ubuntu doesn't have unzip.
sudo apt install git unzip -y




# # RPi4 overclocking
# sudo sed -i 's|^#arm_freq=800|arm_freq=2147|' /boot/config.txt
# sudo sed -i '/arm_freq=/ a gpu_freq=750' /boot/config.txt
# sudo sed -i '/arm_freq=/ a over_voltage=6' /boot/config.txt
# sudo sed -i '/arm_freq=/ a \\n# adding gpu_freq and over_voltage settings' /boot/config.txt