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HACKING.md

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Developing for this project

Testing

Tests are written using Go's testing framework and can be run with the standard go test tool. If you prefer to use the Makefile, make test EXTRAGOARGS=-v will run tests in verbose mode. By default, the unit tests require root privileged access. This can be disabled by setting the DISABLE_ROOT_TESTS environment variable.

You need some external resources in order to run the tests, as described below:

  1. A firecracker and jailer binary (tested with 0.20.0) must either be installed as ./testdata/firecracker or the path must be specified through the FC_TEST_BIN environment variable. The jailer requires go test to be run with sudo and can also be turned off by setting the DISABLE_ROOT_TESTS env flag.
  2. Access to hardware virtualization via /dev/kvm and /dev/vhost-vsock (ensure you have mode +rw!)
  3. An uncompressed Linux kernel binary that can boot in Firecracker VM (Must be installed as ./testdata/vmlinux)
  4. A tap device owned by your userid (Must be either named fc-test-tap0 or have the name specified with the FC_TEST_TAP environment variable; try sudo ip tuntap add fc-test-tap0 mode tap user $UID to create fc-test-tap0 if you need to create one)
  5. A root filesystem image installed (Must be named testdata/root-drive.img)
  6. A secondary device image (Must be named testdata/drive-2.img; can be empty, create it something like dd if=/dev/zero of=testdata/drive-2.img bs=1k count=102400)

With all of those set up, make test EXTRAGOARGS=-v should create a Firecracker process and run the Linux kernel in a MicroVM.

There is also a possibility to configure timeouts in firecracker-go-sdk, you can set those env's to customize tests flow:

    FIRECRACKER_GO_SDK_INIT_TIMEOUT_SECONDS
    FIRECRACKER_GO_SDK_REQUEST_TIMEOUT_MILLISECONDS

You can set them directly or with a help of buildkite, otherwise default values will be used.

Regenerating the API client

The API client can be generated using the Go swagger implementation. To do so, perform the following:

  1. Update client/swagger.yaml
  2. Run go generate
  3. Figure out what broke and fix it.

Continuous Integration

To access /dev/kvm, we are using BuildKite and Amazon EC2 Bare Metal Instances.

The instance is pre-configured to have