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BUILDING.md

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Building docker-scan from source

This guide is useful if you intend to contribute to docker/scan-cli-plugin. Thanks for your effort. Every contribution is very appreciated.

This doc includes:

Build requirements

To build the docker-scan, you just need Docker or Docker Desktop installed:

Build

The whole build process is done by using a Docker container. The images are built using BuildKit which is why you need to use at least a version 19.03 of Docker.

To build the plugin we use two Makefiles :

  • Makefile to run high level commands such as build,cross or test
  • builder.Makefile to run container internal commands (go build, gotestsum, golangci-lint)

From a user point of view, you only need to use commands from the Makefile

make build                  # builds local platform binary
make cross                  # builds cross binaries (linux, darwin, windows)
make install                # builds a local platform binary and copy it to the `cli-plugins` directory

make all                    # lint, validate, build local plaform binary and runs unit and e2e tests

Validation and Linting

As part of the CI, two mandatory specific steps are done to check files formatting:

  • Linting: check the formatting of Go source files
  • Validation: check that go.mod and go.sum are up to date, check that source files contain license headers

You can run this validation locally

make lint                   # runs `Go` linter and checks files respect `Golang` formatting standards
make validate-go-mod        # runs a `go mod tidy` command and verifies there isn't any difference with the current `go.mod` and `go.sum` files
make validate-headers       # runs `ltag` command and checks every source files include a license header
make validate               # runs both `validate-go-mod` and `validate-headers` targets

Testing docker-scan

During the CI, the unit tests and end-to-end tests are executed as part of the PR validation. As a developer you can run these tests locally by using any of the following Makefile targets:

  • make test-unit: run all unit tests
  • make e2e: run all end-to-end tests
  • make test: run both unit and end-to-end tests

Running specific end-to-end tests

To execute a specific end-to-end test or set of end-to-end tests you can specify them with the E2E_TEST_NAME Makefile variable.

# run the e2e test <TEST_NAME>:
make E2E_TEST_NAME=<TEST_NAME> test-e2e

Continuous Integration

We use GitHub Actions to run Continuous Integration. We currently use two different workflows:

Pull Request CI Workflow

This GitHub Action is divided in two steps:

  • Lint and validation checks that the go.mod/sum files are up to date and all source files have a license header
  • Build and test builds cross platform binaries and runs unit and e2e tests (only on linux platform)

Release and weekly CI Workflow

This GitHub Action is used via cron to run each week and to trigger manually a new release. The base behavior of both tasks is the same, it executes the following steps:

  • Create a matrix of targeted operating system
  • Install Docker CLI on the CI node
  • Set up Golang
  • Checkout code of main branch
  • Setup Golang cache
  • Download necessaries binaries (gotestsum ...)
  • Build and run tests (unit and e2e)
  • Upload binaries
  • Send Slack notifications

The release workflow adds these extra steps when the previous checks are OK:

  • Download previously built binaries
  • Run ncipollo/release-action to create a draft release
  • Send Slack notifications