Project local node.js installer

nodeenv.sh

#!/bin/bash
# Setup a project local environment for a nodejs project
# This installs and links a local node instances so that node and application versions can be coupled.
# Installation is both local to the project, and does not require superuser permissions.
# Inspired by Python's virtualenv. For more information, see http://wp.me/pZZvH-an
#
# Usage: 
# 1. Add this file to your node project
# 2. Run with `source ./setup.sh` to setup a local node.js instance
#

NODEVER="v5.8.0"

WORKDIR=`pwd`

TOOLDIR="$WORKDIR/.env"

# Check this is running in the correct shell
if [ $0 = $BASH_SOURCE ]; then
  echo "Warning: $0 should be run using source (ie. 'source nodeenv.sh')"
  echo "The local node instance will need to be manually added to your path"
  MODE="shell"
  set -e
else
  MODE="source"
fi

# Determine OS
if [ "$(uname -s)" == "Darwin" ]; then
    OS="darwin"
elif [ "$(uname -s)" == "Linux" ]; then
    OS="linux"
else
    OS="unknown"
fi

# Determine architecture
if [ "$(uname -m)" == "x86_64" ]; then
    ARCH="x64"
elif [ "$(uname -m)" == "x86" ]; then
    ARCH="x86"
elif [ "$(uname -m)" == "armv7l" ]; then
    ARCH="armv7"
else
    ARCH="unknown"
fi

NODENAME="node-$NODEVER-$OS-$ARCH"
NODEBIN="$NODENAME.tar.gz"
NODESRC="node-$NODEVER.tar.gz"

echo "Version: $NODENAME"

NODEDIR="$TOOLDIR/$NODENAME/bin"

# Locate binaries
NPM="$NODEDIR/npm"
NODE="$NODEDIR/node"

function handleExit () {
	if [ "$MODE" == "source" ]; then
		return $1
	else
		exit $1
	fi
}

function installFromTar {
	CACHED="$HOME/.env/$NODEBIN"
	if [ -f $CACHED ]; then
		echo "Archive found at: $CACHED"
	else
		echo "Cached archive not found, downloading"
		wget https://nodejs.org/dist/$NODEVER/$NODEBIN
		mv $NODEBIN $CACHED
	fi
	if [ ! -f $TOOLDIR/$NODEBIN ]
	 then cp $CACHED $TOOLDIR
	fi
	tar -xf $TOOLDIR/$NODEBIN -C $TOOLDIR
}

function installFromSource {
	CACHED="$HOME/.env/$NODESRC"
	if [ -f $CACHED ]; then
		echo "Archive found at: $CACHED"
	else
		echo "Cached archive not found, downloading"
		wget https://nodejs.org/dist/$NODEVER/$NODESRC
		mv $NODESRC $CACHED
	fi
	if [ ! -f $TOOLDIR/$NODESRC ]
	 then cp $CACHED $TOOLDIR
	fi
	tar -xf $TOOLDIR/$NODESRC -C $TOOLDIR

	# Build and install
	cd $TOOLDIR/node-$NODEVER; ./configure; make -j4; PREFIX=$TOOLDIR/node-$NODEVER-$OS-$ARCH make install; cd $WORKDIR
}

# Create and export expected location
mkdir -p $TOOLDIR
mkdir -p $HOME/.env
export PATH=$NODEDIR:$PATH

# Check for existing installation
if [ -f $NPM ]; then
	echo "Local Node.js installation found, setup complete"
	handleExit 0
else
	echo "Not found, installing local Node.js"
	mkdir -p $TOOLDIR
	
	# Install
	if [ "$ARCH" != "unknown" ]; then
		echo "Recognized architecture: $ARCH, Installing from TAR"
		installFromTar
	else
		echo "Unknown architecture, installing from source"
		installFromSource
	fi

	# Symlink to /node for ease of use
	ln -sF $TOOLDIR/node-$NODEVER-$OS-$ARCH $TOOLDIR/node
	
	echo "Installation complete"
	handleExit 1
fi