vagrant

https://github.com/mitchellh/vagrant

Ruby

Vagrant is a tool for building and distributing development environments.

VagrantPlugins::DockerProvider::Config#build_dir=

The directory with a Dockerfile to build and use as the basis
for this container. If this is set, "image" should not be set.

Source | Google | Stack overflow

Edit

git clone [email protected]:mitchellh/vagrant.git
cd vagrant
open plugins/providers/docker/config.rb

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-VagrantPlugins--DockerProvider--Config-build_dir--for-pr

# Commit to git
git add plugins/providers/docker/config.rbgit commit -m "better docs for VagrantPlugins::DockerProvider::Config#build_dir="

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-VagrantPlugins--DockerProvider--Config-build_dir--for-pr
hub pull-request

# Celebrate!