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Ivan Mikushin
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vendor/github.com/docker/machine/CONTRIBUTING.md
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# Contributing to machine
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[](https://godoc.org/github.com/docker/machine)
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[](https://travis-ci.org/docker/machine)
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Want to hack on Machine? Awesome! Here are instructions to get you
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started.
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Machine is a part of the [Docker](https://www.docker.com) project, and follows
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the same rules and principles. If you're already familiar with the way
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Docker does things, you'll feel right at home.
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Otherwise, go read
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[Docker's contributions guidelines](https://github.com/docker/docker/blob/master/CONTRIBUTING.md).
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The requirements to build Machine are:
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1. A running instance of Docker
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2. The `bash` shell
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To build, run:
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$ script/build
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From the Machine repository's root. Machine will run the build inside of a
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Docker container and the compiled binaries will appear in the project directory
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on the host.
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By default, Machine will run a build which cross-compiles binaries for a variety
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of architectures and operating systems. If you know that you are only compiling
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for a particular architecture and/or operating system, you can speed up
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compilation by overriding the default argument that the build script passes
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to [gox](https://github.com/mitchellh/gox). This is very useful if you want
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to iterate quickly on a new feature, bug fix, etc.
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For instance, if you only want to compile for use on OS X with the x86_64 arch,
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run:
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$ script/build -osarch="darwin/amd64"
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If you don't need to run the `docker build` to generate the image on each
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compile, i.e. if you have built the image already, you can skip the image build
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using the `SKIP_BUILD` environment variable, for instance:
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$ SKIP_BUILD=1 script/build -osarch="darwin/amd64"
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If you have any questions we're in #docker-machine on Freenode.
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## Unit Tests
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To run the unit tests for the whole project, using the following script:
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$ script/test
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This will run the unit tests inside of a container, so you don't have to worry
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about configuring your environment properly before doing so.
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To run the unit tests for only a specific subdirectory of the project, you can
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pass an argument to that script to specify which directory, e.g.:
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$ script/test ./drivers/amazonec2
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If you make a pull request, it is highly encouraged that you submit tests for
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the code that you have added or modified in the same pull request.
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## Code Coverage
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Machine includes a script to check for missing `*_test.go` files and to generate
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an [HTML-based representation of which code is covered by tests](http://blog.golang.org/cover#TOC_5.).
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To run the code coverage script, execute:
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```console
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$ ./script/coverage serve
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```
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You will see the results of the code coverage check as they come in.
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This will also generate the code coverage website and serve it from a container
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on port 8000. By default, `/` will show you the source files from the base
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directory, and you can navigate to the coverage for any particular subdirectory
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of the Docker Machine repo's root by going to that path. For instance, to see
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the coverage for the VirtualBox driver's package, browse to `/drivers/virtualbox`.
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You can hit `CTRL+C` to stop the server.
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## Integration Tests
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### Setup
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We utilize [BATS](https://github.com/sstephenson/bats) for integration testing.
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This runs tests against the generated binary. To use, first make sure to
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[install BATS](https://github.com/sstephenson/bats). Then run `./script/build`
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to generate the binary for your system.
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### Basic Usage
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Once you have the binary, the integration tests can be invoked using the
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`test/integration/run-bats.sh` wrapper script.
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Using this wrapper script, you can invoke a test or subset of tests for a
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particular driver. To set the driver, use the `DRIVER` environment variable.
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The following examples are all shown relative to the project's root directory,
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but you should be able to invoke them from any directory without issue.
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To invoke just one test:
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```console
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$ DRIVER=virtualbox ./test/integration/run-bats.sh test/integration/core/core-commands.bats
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✓ virtualbox: machine should not exist
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✓ virtualbox: create
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✓ virtualbox: ls
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✓ virtualbox: run busybox container
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✓ virtualbox: url
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✓ virtualbox: ip
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✓ virtualbox: ssh
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✓ virtualbox: docker commands with the socket should work
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✓ virtualbox: stop
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✓ virtualbox: machine should show stopped after stop
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✓ virtualbox: machine should now allow upgrade when stopped
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✓ virtualbox: start
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✓ virtualbox: machine should show running after start
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✓ virtualbox: kill
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✓ virtualbox: machine should show stopped after kill
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✓ virtualbox: restart
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✓ virtualbox: machine should show running after restart
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17 tests, 0 failures
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Cleaning up machines...
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Successfully removed bats-virtualbox-test
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```
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To invoke a shared test with a different driver:
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```console
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$ DRIVER=digitalocean ./test/integration/run-bats.sh test/integration/core/core-commands.bats
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...
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```
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To invoke a directory of tests recursively:
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```console
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$ DRIVER=virtualbox ./test/integration/run-bats.sh test/integration/core/
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...
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```
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If you want to invoke a group of tests across two or more different drivers at
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once (e.g. every test in the `drivers` directory), at the time of writing there
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is no first-class support to do so - you will have to write your own wrapper
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scripts, bash loops, etc. However, in the future, this may gain first-class
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support as usage patterns become more clear.
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### Extra Create Arguments
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In some cases, for instance to test the creation of a specific base OS (e.g.
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RHEL) as opposed to the default with the common tests, you may want to run
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common tests with different create arguments than you get out of the box.
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Keep in mind that Machine supports environment variables for many of these
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flags. So, for instance, you could run the command (substituting, of course,
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the proper secrets):
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```
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$ DRIVER=amazonec2 \
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AWS_VPC_ID=vpc-xxxxxxx \
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AWS_SECRET_ACCESS_KEY=yyyyyyyyyyyyy \
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AWS_ACCESS_KEY_ID=zzzzzzzzzzzzzzzz \
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AWS_AMI=ami-12663b7a \
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AWS_SSH_USER=ec2-user \
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./test/integration/run-bats.sh test/integration/core
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```
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in order to run the core tests on Red Hat Enterprise Linux on Amazon.
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### Layout
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The `test/integration` directory is layed out to divide up tests based on the
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areas which the test. If you are uncertain where to put yours, we are happy to
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guide you.
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At the time of writing, there is:
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1. A `core` directory which contains tests that are applicable to all drivers.
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2. A `drivers` directory which contains tests that are applicable only to
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specific drivers with sub-directories for each provider.
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3. A `cli` directory which is meant for testing functionality of the command
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line interface, without much regard for driver-specific details.
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### Guidelines
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The best practices for writing integration tests on Docker Machine are still a
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work in progress, but here are some general guidelines from the maintainers:
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1. Ideally, each test file should have only one concern.
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2. Tests generally should not spin up more than one machine unless the test is
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deliberately testing something which involves multiple machines, such as an `ls`
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test which involves several machines, or a test intended to create and check
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some property of a Swarm cluster.
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3. BATS will print the output of commands executed during a test if the test
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fails. This can be useful, for instance to dump the magic `$output` variable
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that BATS provides and/or to get debugging information.
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4. It is not strictly needed to clean up the machines as part of the test. The
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BATS wrapper script has a hook to take care of cleaning up all created machines
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after each test.
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# Drivers
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Docker Machine has several included drivers that supports provisioning hosts
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in various providers. If you wish to contribute a driver, we ask the following
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to ensure we keep the driver in a consistent and stable state:
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- Address issues filed against this driver in a timely manner
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- Review PRs for the driver
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- Be responsible for maintaining the infrastructure to run unit tests
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and integration tests on the new supported environment
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- Participate in a weekly driver maintainer meeting
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If you can commit to those, the next step is to make sure the driver adheres
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to the [spec](https://github.com/docker/machine/blob/master/docs/DRIVER_SPEC.md).
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Once you have created and tested the driver, you can open a PR.
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Note: even if those are met does not guarantee a driver will be accepted.
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If you have questions, please do not hesitate to contact us on IRC.
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