Bootstrap fresh macOS with Xcode CLT, Homebrew, and chezmoi

bootstrap-macos.sh

#!/usr/bin/env bash
set -euo pipefail

if [[ "$(uname -s)" != "Darwin" ]]; then
  echo "This bootstrap script is for macOS only." >&2
  exit 1
fi

if ! xcode-select -p >/dev/null 2>&1; then
  echo "==> Installing Xcode Command Line Tools"
  xcode-select --install || true
  echo
  echo "Complete the Xcode Command Line Tools installation, then rerun this script."
  exit 1
else
  echo "==> Xcode Command Line Tools already installed"
fi

if ! command -v brew >/dev/null 2>&1; then
  echo "==> Installing Homebrew"
  /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
else
  echo "==> Homebrew already installed"
fi

# Homebrew may not be in PATH yet in the current shell.
if ! command -v brew >/dev/null 2>&1; then
  if [[ -x /opt/homebrew/bin/brew ]]; then
    eval "$(/opt/homebrew/bin/brew shellenv)"
  elif [[ -x /usr/local/bin/brew ]]; then
    eval "$(/usr/local/bin/brew shellenv)"
  fi
fi

if ! command -v brew >/dev/null 2>&1; then
  echo "Homebrew was installed but is still not available in PATH." >&2
  echo "Open a new terminal and run this script again." >&2
  exit 1
fi

if ! brew list --formula chezmoi >/dev/null 2>&1; then
  echo "==> Installing chezmoi"
  brew install chezmoi
else
  echo "==> chezmoi already installed"
fi

source_dir="$(chezmoi source-path)"
if [[ -d "$source_dir/.git" ]]; then
  echo "==> chezmoi already initialized at $source_dir"
  echo "==> Running chezmoi apply"
  chezmoi apply
else
  echo "==> Initializing chezmoi"
  chezmoi init --apply mrclrchtr
fi

echo
echo "Bootstrap complete."