Travis CI Tutorial

Continuous Integration

• The practice of merging in small code changes frequently
• The goal is to build healthier software by developing and testing in smaller increments.

Travis-CI

• supports your development process by automatically building and testing code changes, providing immediate feedback on the success of the change.
• automate other parts of your development process by managing deployments and notifications.

Core Concepts

• phase: the sequential steps of a job. For example, the install phase, script phase, deploy phase.

• job: an automated process that carries out a series of phases such as compiling your code, running tests.

• build: a group of jobs. A build finishes when all of its jobs are finished
• stage: a group of jobsthat run in parallel as part of a sequential build process composed of multiple stages.

Broken Build

• errored: a command in the before_install, install, or before_script phase returned a non-zero exit code.
• failed: a command in the script phase returned a non-zero exit code.
• canceled: a user cancels the job before it completes.

Job Lifecycle

• install : install any dependencies required
• script : run the build script and the test script

Customizing Phase

install: ./install-dependencies.sh

install:
  - bundle install --path vendor/bundle
  - npm install
  
script:
  - bundle exec rake build
  - bundle exec rake builddoc

script: bundle exec rake build && bundle exec rake builddoc

Build Matrix

• combine a language-and-environment dependent set of configuration options to automatically create a matrix of all possible combinations
• specify the exact combination of configurations you want in matrix.include

rvm:
  - 2.5
  - 2.2
gemfile:
  - gemfiles/Gemfile.rails-3.2.x
  - gemfiles/Gemfile.rails-3.0.x
env:
  - ISOLATED=true
  - ISOLATED=false

jobs:
  include: //exclude
  - rvm: 2.5
    gemfile: gemfiles/Gemfile.rails-3.2.x
    env: ISOLATED=false
  - rvm: 2.2
    gemfile: gemfiles/Gemfile.rails-3.0.x
    env: ISOLATED=true

Using different Programming Language

dist: xenial
language: php
php:
  - '5.6'
jobs:
  include:
    - language: python
      python: 3.6
      script:
        - python -c "print('Hi from Python!')"

Build Stage

A way to group jobs, and run jobs in each stage in parallel, but run one stage after another sequentially.

jobs:
include:
  - stage: test
    script: ./test 1
    script: ./test 2
  - stage: deploy
    script: ./deploy

Specifying Stage Oder

specify the order for stages in the section stages

stages:
  - compile
  - test
  - deploy

Conditional Builds, Stages and Jobs

// Add `if:branch=master`

stages:
  - name: deploy
    if: branch = master

Get Start

• Go to Travis-ci.com and Sign up with GitHub.
• Accept the Authorization of Travis CI.
• Click the green Activate button and select the repositories you want to use with Travis CI.
• Add a .travis.yml file to your repository, git commit and push to trigger a Travis CI build.

Build Specific Branched

Add safelist and blocklist

# blocklist
branches:
  except:
  - legacy
  - experimental

# safelist
branches:
  only:
  - master
  - stable

Installing a Second Language

In the before_install stage of the build

language: python

before_install:
- rvm install 2.1.5

language: node_js

before_install:
- phpenv global 7.0

Use docker

services:
  - docker

• docker push/pull
• docker build …