Reproduction case for slow chefignore performance

_testcase.sh

#!/bin/bash
# This case verifies that chefignore is not processed efficiently, causing slow chefspec runs (among other things
# when large build-time directories are present).
# 
# * Download and unpack this gist to a directory with at least one empty directory above - eg /tmp/chef/slow-chef
# * cd /tmp/chef/slow-chef
# * chmod +x _testcase.sh
# * ./_testcase.sh
#
# Observe that once vendor directory is present, even with a chefignore, the runtime increases dramatically (around
# 180 times slower on my machine)
set -o errexit

# Move stuff to the right place because of gist limitations
if [ ! -d spec ]; then
  mkdir spec
fi
if [ ! -d recipes ]; then
  mkdir recipes
fi

cp recipes_default.rb recipes/default.rb
cp spec_spec_helper.rb spec/spec_helper.rb
cp spec_default_spec.rb spec/default_spec.rb
  
# Cleanup any previous test
rm -f chefignore
rm -rf vendor
rm -f Gemfile.lock

echo "Installing gems"
bundle install --path="/tmp/cheftest-gems" > /dev/null
echo "With no local vendors"
time bundle exec rspec

mkdir vendor
rsync -a /tmp/cheftest-gems/ vendor/bundle
echo "With local vendors and no chefignore - expected to be slow"
time bundle exec rspec

echo "With local vendors chefignored - should be faster"
echo "vendor" > chefignore
echo "vendor/*" >> chefignore
time bundle exec rspec

Gemfile

source 'https://rubygems.org'

gem 'chefspec',   '~> 7.0'
gem 'chef', '~>13.2'

metadata.rb

name 'slow-chef'

recipes_default.rb

# empty recipe

spec_default_spec.rb

require 'spec_helper'

describe 'slow-chef::default' do
  let (:chef_run) { ChefSpec::SoloRunner.new.converge(described_recipe) }

  it 'converges once' do
   chef_run
  end

  it 'converges twice' do
   chef_run
  end
end

spec_spec_helper.rb

require 'chefspec'

RSpec.configure do | c |
  c.platform = 'ubuntu'
  c.version = '14.04'
end