Grunt build script for CI (Jenkins)

build-package.json

# Create build-directory in project and place this package.json in that dir
{
  "name": "build",
  "version": "0.0.0",
  "private": true,
  "description": "Grunt-cli & Bower",
  "dependencies": {
    "grunt-cli": "0.1.11",
    "bower": "1.2.8"
  },
  "engines": {
    "node": "~0.10.20"
  }
}

build_grunt.sh

#!/usr/bin/env bash

# Idea for npm/bower cache from: https://github.com/heroku/heroku-buildpack-nodejs/blob/diet/bin/compile

# Exit with error if any command fails
set -e

# Tells bower to use non-interactive mode
CI=true

echo "Building UI project using Grunt"

echo "Retrieve latest Node"
cd build

if [[ ! -d "jq" ]]; then
    # Download jq - json processor
    mkdir jq
    cd jq
    curl http://stedolan.github.io/jq/download/linux64/jq -s -o jq
    chmod +x jq
    cd ..
fi
PATH="$(pwd)/jq:$PATH"

semver_range=$(cat package.json | jq -r .engines.node)
# Old curl versions don't have support for --data-urlencoded
semver_urlencoded=$(perl -MURI::Escape -e 'print uri_escape($semver_range);' "$2")
node_version=$(curl --silent --get -d "range=${semver_range}" https://semver.io/node/resolve)
echo "Using node version: $node_version (semver: $semver_range)"
if [[ ! -d "node-v$node_version-linux-x64" ]]; then
    rm -fr node-v*-linux-x64
    # Selected node version doesn't exist
    node_url="http://s3pository.heroku.com/node/v$node_version/node-v$node_version-linux-x64.tar.gz"
    # extract into ./node-v<version>-linux-x64
    curl $node_url -s -o - | tar xzf - -C .
fi

PATH="$(pwd)/node-v${node_version}-linux-x64/bin:$PATH"

# Install bower & grunt into "global" npm prefix
echo "Install build tools"
npm --no-color install
npm prune
PATH="$(pwd)/node_modules/.bin:$PATH"
cd ..

cd ui

set +e
echo "Installing node dependencies"
npm --no-color install
if [[ $? -ne 0 ]]; then
    echo "First try with npm failed. Clearing and trying again"
    rm -rf node_modules/
    set -e
    npm --no-color install
fi
set -e

# Don't exit if bower fails the first time
set +e
echo "Installing bower dependencies"
bower --no-color install
if [[ $? -ne 0 ]]; then
    echo "First try with bower failed. Clearing and trying again"
    rm -r app/components/
    # Exit if bower fails again
    set -e
    bower --no-color install
fi
set -e

echo "Prune unnecessary deps"
npm --no-color prune
bower --no-color prune

echo "Running UI unit tests"
grunt --no-color env:test mochaTest:unit

echo "Running grunt build"
grunt --no-color build