Technology · Ebook

Copa: Patching Container Images Without a Rebuild

by Shriira Press

Copacetic, known on the command line as copa, is a CNCF sandbox project and a small Go CLI built on BuildKit that closes the gap between learning about a vulnerability and fixing it. Instead of rebuilding an image and waiting on an upstream publisher, Copa reads a vulnerability scan report, works out which OS packages need updating, fetches and applies only those, and writes a patched image with a single extra layer. This book traces that scan-parse-apply pipeline from the ground up: the remediation problem, BuildKit's diff and merge machinery, the copa patch command, the tooling-container trick for distroless and multi-platform images, scanner plugins and VEX output, and how teams wire it into real CI/CD pipelines.

Contents

1. 1Preface
2. 2Chapter 1 — The Remediation Gap
3. 3Chapter 2 — How Copa Patches an Image
4. 4Chapter 3 — BuildKit and the Patch Layer
5. 5Chapter 4 — The copa patch Command
6. 6Chapter 5 — Distroless, Multi-Platform, and the Tooling Container
7. 7Chapter 6 — Extensibility: Scanner Plugins and VEX
8. 8Chapter 7 — Copa in Practice