How to reproduce a travis-ci build environment for debugging

Question

I am seeing a build failure on travis-ci, which I cannot reproduce on my local machine. Are there instructions somewhere for setting up a VM that is identical to the travis

Answer 1

For container-based builds, there are now instructions on how to setup a docker image locally.

Unfortunately, quite a few steps are still manual. Here are the commands you need to get it up and running:

# change the image according to the language chosen in .travis.yml
$ docker run -it -u travis quay.io/travisci/travis-jvm /bin/bash

# now that you are in the docker image, switch to the travis user
sudo su - travis

# Install a recent ruby (default is 1.9.3)
rvm install 2.3.0
rvm use 2.3.0

# Install travis-build to generate a .sh out of .travis.yml
cd builds
git clone https://github.com/travis-ci/travis-build.git
cd travis-build
gem install travis
travis # to create ~/.travis
ln -s `pwd` ~/.travis/travis-build
bundle install

# Create project dir, assuming your project is `me/project` on GitHub
cd ~/builds
mkdir me
cd me
git clone https://github.com/me/project.git
cd project
# change to the branch or commit you want to investigate
travis compile > ci.sh
# You most likely will need to edit ci.sh as it ignores matrix and env
bash ci.sh