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

Eregon's answer failed for me at travis compile, there error looks like:

/home/travis/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- travis/support (LoadError)

I got it working with the following adjustments: (Adjustments marked with # CHANGED. I'm using the node environment)

# change the image according to the language chosen in .travis.yml
# Find images at https://quay.io/organization/travisci
docker run -it quay.io/travisci/travis-node-js /bin/bash

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

# Install a recent ruby (default is 1.9.3) to make bundle install work
rvm install 2.3.0 
rvm use 2.3.0

# Install travis-build to generate a .sh out of .travis.yml
sudo mkdir builds         # CHANGED
cd builds
sudo 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
bundler add travis        # CHANGED
sudo mkdir bin            # CHANGED
sudo chmod a+w bin/       # CHANGED
bundler binstubs travis   # CHANGED

# 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/travis-build/bin/travis compile > ci.sh # CHANGED
# You most likely will need to edit ci.sh as it ignores matrix and env
# In particular I needed to edit --branch=’’ to the branch name
bash ci.sh