Bash script to bootstrap a new Mac OS Machine

bootstrap-mac.sh

#!/bin/bash
# CHECKPOINTING -- INCOMPLETE SCRIPT
# A script to bootstrap a new Mac OS machine from scratch using ansible and
# the approach taken here: https://github.com/geerlingguy/mac-dev-playbook#installation
# To use this script, for that repo, update to reflect requirements to your system, and
# change the following to your github username:
GITHUB_USER=boldfield

# Location that temporary files will be stored. Directory will be removed
# at the end of the script.
BOOTSTRAP_DIR="/tmp/bootstrap"

# Make sure to add the install location for pip to our path
# Assumes python2.7, which is currently the default for MacOS
PATH="$PATH:/Users/$USER/Library/Python/2.7/bin/"

# Evaluate required commands
PIP=$(command -v pip)
ANSIBLE=$(command -v ansible)
CURL=$(command -v curl) # Avoid any aliasing which may be in place

# PIP installation requirements
GET_PIP="${BOOTSTRAP_DIR}/get-pip.py"
GET_PIP_URL="https://bootstrap.pypa.io/get-pip.py"

# XCode installation requirements
XCODE_CLI_DIR="/Library/Developer/CommandLineTools/"


function install_xcode_cli() {
  echo "Checking for xcode cli tools..."
  if [[ ! -d "$XCODE_CLI_DIR" ]]
  then
    if ! xcode-select --install
    then
      return 1
    fi
  else
    echo "XCode CLI already installed, continuing."
  fi
  return 0
}

function install_deps() {
  echo "Checking for install dependencies..."
  
  if [[ ! -d "$BOOTSTRAP_DIR" ]]
  then
    mkdir "$BOOTSTRAP_DIR"
  fi
  
  if [[ -z "$PIP" ]]
  then
    if [[ ! -f "$GET_PIP" ]]
    then
      if ! $CURL GET_PIP_URL -o $GET_PIP
      then
        return 1
      fi
    fi

    if ! python $GET_PIP --user
    then
      return 1
    fi
  else
    echo "Found pip already installed, continuing: $PIP"
  fi
  echo "Dependency check complete..."

  return 0
}

function install_ansible() {
  echo "Installing ansible..."
  if [[ -z "$ANSIBLE" ]]
  then
    # See the following for CFLAGS/CPPFLAGS settings: https://bit.ly/2yXV4Ul
    CFLAGS=-Qunused-arguments CPPFLAGS=-Qunused-arguments $PIP install --user ansible
  else
    echo "Found ansible already installed, continuing: $ANSIBLE"
  fi
  echo "Ansible installed!"

  return 0
}

function cleanup() {
  if [[ -d "$BOOTSTRAP_DIR" ]]
  then
    rm -r "$BOOTSTRAP_DIR"
  fi
}

#############################
#### MAIN BODY OF SCRIPT ####

# XCode requirements
if ! install_xcode_cli
then
  echo "Failed to install xcode cli, exiting!"
  exit 1
fi

# PIP/python requirements
if ! install_deps
then
  echo "Failed to install dependencies, exiting!"
  exit 1
fi
# Refresh location of pip
PIP=$(command -v pip)

# Ansible requirements
if ! install_ansible
then
  echo "Failed to install ansible, exiting!"
  exit 1
fi
# Refresh location of ansible
ANSIBLE=$(command -v ansible)


# Clean up our mess
if ! cleanup
then
  echo "Failed to cleanup but otherwise successful, exiting with success"
fi