cidrcalc

README

Go app template build environment

This is a skeleton project for a Go application, which captures the best build techniques I have learned to date. It uses a Makefile to drive the build (the universal API to software projects) and a Dockerfile to build a docker image.

This has only been tested on Linux, and depends on Docker buildx to build.

Customizing it

To use this, simply copy this repo and make the following changes:

Makefile:

• change BINS to your binary name(s)
• replace cmd/myapp-* with one directory for each of your BINS
• change REGISTRY to the Docker registry you want to use
• choose a strategy for VERSION values - git tags or manual
• maybe change ALL_PLATFORMS
• maybe change BASE_IMAGE (it must be a manifest-list with support for all platforms in ALL_PLATFORMS)

Dockerfile.in:

• maybe change or remove the USER if you need

Go Modules

This assumes the use of go modules (which is the default for all Go builds as of Go 1.13).

Dependencies

This includes go-licenses and golangci-lint, but they are kept in the tools sub-module. If you don't want those (or their dependencies, they can be removed.

Building

Run make or make build to compile your app. This will use docker buildx (which you need to have installed) to build your app, with the current directory volume-mounted into place. This will store incremental state for the fastest possible build. Run make all-build to build for all architectures.

Run make container to build the container image. It will calculate the image tag based on the most recent git tag, and whether the repo is "dirty" since that tag (see make version). Run make all-container to build containers for all supported architectures.

Run make push to push the container image to REGISTRY. Run make all-push to push the container images for all architectures.

Run make manifest-list to build and push all containers for all architectures, and then publish a manifest-list for them.

Run make clean to clean up.

Run make help to get a list of available targets.

Testing

Run make test and make lint to run tests and linters, respectively. Like building, this will use docker to execute.

The golangci-lint tool looks for configuration in .golangci.yaml. If that file is not provided, it will use its own built-in defaults.