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script/lint, script/test, script/cibuild and script/docker pass a new CACHEBUST build argument on every build in place of --no-cache, which empties every cache mount. Every Dockerfile stage declares ARG CACHEBUST first, so every RUN step still runs on every check build. The canonical Go Dockerfile mounts Go's build cache on the steps that compile and runs both go test runs with -count=1, so no test result is reused. REPO_POLICIES.md, both checklists, the Go styleguide and the README say so. A stage without the ARG line is served from cache, so a repository re-vendors the scripts and the ARG lines in one commit. Model: opus-5-5
66 lines
2.0 KiB
Docker
66 lines
2.0 KiB
Docker
# Lint phase. The linter is invoked directly rather than through `make
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# lint` or `script/lint`, which are themselves a docker build and would
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# recurse into a daemon that does not exist in a build step.
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#
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# Every stage declares ARG CACHEBUST first: script/ passes a new value on
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# every build, which reruns every RUN step after it.
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#
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# node 22-alpine, 2026-02-22
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FROM node@sha256:e4bf2a82ad0a4037d28035ae71529873c069b13eb0455466ae0bc13363826e34 AS lint
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ARG CACHEBUST
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WORKDIR /app
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COPY script/ script/
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COPY package.json yarn.lock ./
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RUN script/bootstrap
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COPY . .
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RUN yarn run prettier --check '**/*.md' --tab-width 4 --prose-wrap always
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# Test phase, same shape and for the same reason.
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#
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# node 22-alpine, 2026-02-22
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FROM node@sha256:e4bf2a82ad0a4037d28035ae71529873c069b13eb0455466ae0bc13363826e34 AS test
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ARG CACHEBUST
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WORKDIR /app
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COPY script/ script/
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COPY package.json yarn.lock ./
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RUN script/bootstrap
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COPY . .
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RUN echo "No tests defined."
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# Development environment, and the last stage: a plain `docker build .`
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# names no target and so builds this one. Nothing is wanted from the two
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# phases above; the copies are what make BuildKit build them first, so
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# this image cannot be produced unless lint and test passed. A stage
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# appended after this one would drop all three out of a plain build.
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#
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# node 22-alpine, 2026-02-22
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FROM node@sha256:e4bf2a82ad0a4037d28035ae71529873c069b13eb0455466ae0bc13363826e34
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ARG CACHEBUST
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WORKDIR /app
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COPY --from=lint /app/package.json /dev/null
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COPY --from=test /app/package.json /dev/null
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# script/bootstrap installs all prerequisites. Manifests are copied
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# first so that layer stays cached until dependencies change.
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COPY script/ script/
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COPY package.json yarn.lock ./
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RUN script/bootstrap
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COPY . .
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# Nothing here is compiled and a LABEL cannot run git, so the version is
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# the VERSION build argument that script/docker and script/cibuild pass;
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# a plain `docker build .` leaves it empty.
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ARG VERSION
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LABEL org.opencontainers.image.version="${VERSION}"
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