Scratch Build

Introduction

Scratch Build is a small CLI tool that can successfully compile from scratch the majority of the Docker library images.

Images are built by traversing the Dockerfile stack down to either scratch or a known working alternative for the target architecture, and then working up to the target.

This is VERY useful for rebuilding docker images on non-intel architectures.

Getting Started

You use scratchbuild build just like docker build:

$ scratchbuild build -t "myname/myimage:latest-arm" -f Dockerfile .

Scratch Build will detect your target architecture (customizable with the flags), traverse the stack of FROM declarations, make a plan on how to build the container for the target arch, and then execute the plan in stages.

Build Quirks

Note: you may have some errors when trying to build. In this case, try disabling CGO:

CGO_ENABLED=0 go build -v -o scratchbuild github.com/paralin/scratchbuild/cmd/scratchbuild