Simple containerized environment to reproduce travis builds for opam packages using the .travis-docker.sh script. It creates a "docker in docker" server instance and a docker client that talks to it and acts as the travis runner, creating the container in which the build is executed. The docker server container uses a persistent host volume in ${HOME}/.dind-storage to speed up the builds (images are kept in the host and only need to be downloaded once).
As a first step you need to create a file with all the required environment variables:
$ cat <<EOF >> env.sh
export DISTRO=ubuntu-16.04
export OCAML_VERSION=4.04.0
export PACKAGE=ocaml-uri
export POST_INSTALL_HOOK="OPAMYES=true opam depext -i react ssl lwt"
export REVDEPS="cohttp git github irmin sociaml-facebook-api sociaml-oauth-client sociaml-tumblr-api spotify-web-api syndic"
...
At least DISTRO, OCAML_VERSION and PACKAGE are required. Then, from the target project root you can execute the run.sh script in this repo passing the previously created env.sh file path as parameter:
/path/to/ocaml-ci-scripts/travis-runner/run.sh /path/to/env.sh