dommage is a shell script that wraps the Mirage CLI to make use of Docker containers. This has a handful of notable benefits:

• you can cache the OPAM build artefacts in the container image which speeds up local builds;
• by publishing said build container image, you can re-use it in Travis builds, speeding those up considerably; and
• you can now easily test build -t xen targets on OSX.

I've tried to minimise interference with the normal operation of Mirage CLI so simply replacing mirage with dommage is supposed to work. To publish the resulting container image, dommage publish <image>. See my website Makefile and .travis.yml for extended examples.

Issues, comments, suggestions and bug fixes all welcome!

To start, dommage provides a few management commands to manipulate the build container:

• dommage init BASE-IMAGE creates a new container, based off BASE-IMAGE from the Docker Hub
• dommage publish IMAGE commits the current container and pushes it to Docker Hub as IMAGE
• dommage destroy stops and removes the current build container
• dommage run ... executes a command inside the current build container

In addition, it wraps the main Mirage CLI commands:

• dommage configure ... runs mirage configure ... && make depends inside the build contianer
• dommage build ... runs mirage build ... inside the build container
• dommage clean ... runs mirage clean ... inside the build container