💻 Install macOS Catalina

install-macos.sh

#!/bin/bash

# Enable sudo Touch ID authentication.
sudo python <<HEREDOC
import re

pam_cfg = '/etc/pam.d/sudo'
auth_re = re.compile(r'^auth\s+sufficient\s+')
tid_re = re.compile(r'^auth\s+sufficient\s+pam_tid.so')

def main():
  with open(pam_cfg, 'r') as f:
    contents = f.readlines()
  index = -1
  template = 'auth sufficient '
  for i, line in enumerate(contents):
    if tid_re.match(line) != None:
      return
    m = auth_re.match(line)
    if m != None:
      index = i
      template = m.group(0)
  
  contents.insert(index + 1, template + 'pam_tid.so\n')
  with open(pam_cfg, 'w') as f:
    f.write(''.join(contents))

main()
HEREDOC

# Install XCode Command Line Tools.
xcode-select --install &> /dev/null

# Wait until XCode Command Line Tools installation finished.
until $(xcode-select --print-path &> /dev/null); do
  sleep 5;
done

# Install Homebrew.
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

# Fix permission issues with ZSH.
CWD=$(pwd)
cd /usr/local/share
sudo chmod -R 755 zsh
cd $CWD

# Install Antigen.
CWD=$(pwd)
cd /usr/local/share
mkdir antigen
sudo chmod -R 755 antigen
cd antigen
curl -L git.io/antigen > antigen.zsh
cd $CWD