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Customizing dev container startup

Dry run

$ bob dev runs $ docker run ... under the hood. There are times when you need to add some special features to the container that would be started by $ bob dev. Examples:

  • Adding special Linux capabilities with --cap-add
  • Setting custom DNS server
  • etc. anything special.

For these cases you can ask Bob to dump the $ docker run ... command that it would invoke:

$ bob dev --dry
docker run --rm --interactive --tty --name tbdev-ubackup-default --volume /vagrant/ubackup/:/workspace --workdir /workspace --env FRIENDLY_REV_ID=dev --env BUILD_LINUX_AMD64=true fn61/buildkit-golang:20200212_0907_06f93bc3 bash

Now you can copy the command, add your customizations and run it directly without Bob. The end result is the same if it would be run by $ bob dev. You still get all the goodies like when you run $ bob dev and the container already exists, Bob gives you an additional shell inside the same container (equivalent to running $ docker exec -it <container_id> bash).

Upcoming features

We should consider adding syntax like this, which probably would cover most of dry run's use cases:

    "uses": "docker://fn61/buildkit-golang:20200212_0907_06f93bc3",
    "mount_destination": "/workspace",
    "workdir": "/workspace",
+   "dev_docker_run_extra_flags": ["--cap-add", "NET_BIND_SERVICE"],
    "commands": {
        "build": ["bin/build.sh"],
        "dev": ["bash"]