Publish with Travis
In this section, we’re going to learn how to configure Travis so you can publish your microsite when you merge in master.
There are two options for publishing the site. See Configuring the Microsite section for more information.
Publish using sbt-ghpages
When the property
micrositePushSiteWith is set to
GHPagesPlugin (by default), the site is pushed using the sbt-ghpages plugins. The steps for this approach are:
1- Generate an SSH key pair
Run this command in your console
$ ssh-keygen -t rsa -b 4096 -C "Travis Deploy Key" -f travis-deploy-key
After that, you’ll see two new files in your folder:
Note: If you are creating the keys in your project, maybe you should add these files to your .gitignore file.
2- Add key to GitHub Project
Add the content of
travis-deploy-key.pub in the
Deploy Key section of the GitHub project’s settings page.
Deploy Keys. Make sure you allow write access in order to push in this repository.
3- Encrypt your keys
Travis needs the keys for publishing the microsite in
gh-pages branch. It’s very important that you encrypt your keys using the
travis command line. You have to install Travis:
$ gem install travis
Note: An important thing to remember is that you can only have one file encrypted in Travis. If you need more keys, you should use
tar for joining your different keys. In our example, we are only going to use the key
We have to encrypt the
travis-deploy-key file, and we have to add the encrypted file to GitHub.
First, we must be logged into Travis:
$ travis login
Secondly, encrypt the file:
$ travis encrypt-file travis-deploy-key travis-deploy-key.enc
You are going to see the following response:
encrypting travis-deploy-key for [org]/[project] storing result as travis-deploy-key.enc Please add the following to your build script (before_install stage in your .travis.yml, for instance): openssl aes-256-cbc -K $encrypted_[your_number]_key -iv $encrypted_[your_number]_iv -in travis-deploy-key.enc -out travis-deploy-key -d Pro Tip: You can add it automatically by running with --add. Make sure to add keys.tar.enc to the git repository. Make sure not to add keys.tar to the git repository. Commit all changes to your .travis.yml.
Finally, add the encrypted file to your git:
$ git add travis-deploy-key.enc
4- Configure your .travis.yml
Our recommendation is that you should use
Bash Scripts and run the script when you merge the changes in master.
This is the
language: scala scala: - 2.12.10 jdk: - oraclejdk8 before_install: - if [ "$TRAVIS_BRANCH" = "master" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then bash scripts/decrypt-keys.sh; fi install: - rvm use 2.6.5 --install --fuzzy - gem install jekyll -v 4 script: - sbt ++$TRAVIS_SCALA_VERSION test scripted after_success: - if [ "$TRAVIS_BRANCH" = "master" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then bash scripts/publishMicrosite.sh; fi - if [ "$TRAVIS_PULL_REQUEST" = "true" ]; then echo "Not in master branch, skipping deploy and release"; fi
You can see that, before we install, we run
decrypt-keys.sh, then we install
jekyll, and, finally, we are running
Next, you can see the
#!/bin/sh openssl aes-256-cbc -K $encrypted_[your_number]_key -iv $encrypted_[your_number]_iv -in travis-deploy-key.enc -out travis-deploy-key -d; chmod 600 travis-deploy-key; cp travis-deploy-key ~/.ssh/id_rsa;
The most important thing here is the
openssl command. You should use the command that you receive as a response when you encrypt the file using the
travis command above.
In this script, we decrypt the keys and copy
.ssh to the folder in order to publish it in GitHub later.
Next, you can see the
#!/bin/bash set -e git config --global user.email "your_user_email" git config --global user.name "your_user_name" git config --global push.default simple sbt docs/publishMicrosite
In this script, we are publishing the microsite in GitHub Pages. To do this, we should add the user information for git.
Publish using GitHub4s
With this method, you don’t need to generate any ssh keys or encrypt any files. We’ll use the GitHub API for publishing the site. The steps are:
1- Create a token for your project
You need to create a GitHub token with
repo scope. You can create it in the GitHub settings page.
Copy the token in a safe place. We’ll use this token through an environment variable as we’ll see shortly.
2- Configure your project build
You need to set these two sbt settings:
micrositePushSiteWith := GitHub4s
micrositeGithubToken := getEnvVar("GITHUB_TOKEN")
3- Add the environment variable in Travis
The final step is to define the
GITHUB_TOKEN environment variable in Travis Repository Settings. You can do it following the documentation.