language: ruby
sudo: required
services:
  - docker
rvm:
  - 2.3
  - 2.4
  - 2.5
  - ruby-head
bundler_args: "--jobs=4 --retry=3"
cache:
  bundler: true
  directories:
    - $HOME/docker

before_cache:
  # Save tagged docker images
  - >
    mkdir -p $HOME/docker && docker images -a --filter='dangling=false' --format '{{.Repository}}:{{.Tag}} {{.ID}}'
    | xargs -n 2 -t sh -c 'test -e $HOME/docker/$1.tar.gz || docker save $0 | gzip -2 > $HOME/docker/$1.tar.gz'

before_install:
  - gem update --system --no-document
  - gem install bundler --no-document
  # Load cached docker images
  - if [[ -d $HOME/docker ]]; then ls $HOME/docker/*.tar.gz | xargs -I {file} sh -c "zcat {file} | docker load"; fi

script:
  - bundle exec rake spec
notifications:
  email: false
  slack:
    secure: PcecHsVS6lw89K5PllW8xFlzu0d04p6lYfxlUZL0/yp9flAczElJME4RshSMSkbnu5e2Iw8KUA2xB1jkAzDo9qYoXveaKyjkFUOb1ZxYIVxzzfoDDwUNTMmSoyjZjvbeBUcpxxmxy6nXa3zS+gA2ohqWhS9WTTlTqyM5RriDjZ8=
matrix:
  allow_failures:
  - rvm: ruby-head
branches:
  only:
  - master