Project · Go · MIT
muscles active
Explains container images layer by layer, finds the bytes an image stores but never shows, diffs two images and fails CI when an image breaks its budgets.
brew install rossedman/tap/musclesmuscles shows what every layer of a container image added, modified, rewrote with the same contents and deleted, next to the Dockerfile step that did it. It reads from the Docker daemon, a registry (without pulling), a docker save tarball or an OCI layout.
muscles python:3.12-slim # what to fix first, and what it saves- Every layer, explained, with notes for package caches left behind, deletions that free nothing and
chown -Rrewrites. - Waste, attributed. Every hidden byte with the layer that stored it and the layer that hid it.
- Release diffs. Which layers two images share and every path that changed.
- CI budgets for size, waste, growth against main and forbidden paths, from a committed
.muscles.yaml. - Fast. Layer indexes are cached by digest, so a base image is only read once.