sneak
4720c40cfa
script/bootstrap did `pkg_install hugo hugo hugo hugo`, so the tool that produces the published artifact was whatever the base image's package repo happened to serve: alpine 3.21 gives hugo 0.139.0, about two years behind upstream, chosen by nobody, and liable to change silently on any base image digest bump. Hugo's version is a property of the site's output, not of the build environment, so it now gets pinned like every other external reference in this repo. It is installed with `go install github.com/gohugoio/hugo@v0.164.0`, which verifies the module against the sum.golang.org checksum database. That is genuine hash verification rather than bare version pinning, it is the mechanism REPO_POLICIES.md already names for Go, and it needs no hand-maintained sha256. It also keeps a single pinned base image: a digest-pinned Hugo container would have reintroduced the second base image that #7 deliberately removed. Two constants carry the decision, each with the canonical `# name version, YYYY-MM-DD` comment: - HUGO_VERSION=v0.164.0, the current stable release. - HUGO_GOTOOLCHAIN=go1.26.5. hugo v0.164.0's go.mod requires go >= 1.26.0 and alpine 3.21's go package is 1.23.9 built with GOTOOLCHAIN=local, so a bare `go install` refuses to run at all. Naming the toolchain makes Go fetch it through the module proxy and verify it against sum.golang.org like any other module, so the chain stays hash-verified end to end and the compiler is deliberate too. CGO_ENABLED=0 is deliberate: standard Hugo, not extended. Verified that this site uses nothing extended provides - no .scss/.sass, no resources.ToCSS, no PostCSS, and no image processing; the CSS is plain and inlined by readFile in baseof.html. The `+extended` on the apk build this replaces was incidental, and the script says so, so a later change does not assume extended is required. The binary is placed in /usr/local/bin rather than left in a GOPATH bin directory, because it has to be on the default PATH of a *fresh* shell: the Dockerfile's `RUN make check` and deploy.yml's `script/test` step each start their own shell. The location is overridable via HUGO_BIN_DIR for unprivileged installs, and `go install` itself runs as the invoking user so a workstation's module cache is not populated as root. The idempotency guard is version-aware instead of `missing hugo`: an older hugo already on PATH must be replaced, not accepted, or the pin means nothing. A same-version build that happens to be `+extended` is accepted, since it renders this site identically. After installing, the script re-checks what `hugo` on PATH actually resolves to and fails loudly if something else shadows it. Rendered output was compared three ways in a container carrying both binaries - apk 0.139.0 against 0.164.0 on identical sources. Across the whole public/ tree the only byte that differs is the generator meta tag's version string, which is the change describing itself. The RSS <language> element and the html lang attribute are unchanged. Cold `script/cibuild` is 2m36s, within the five-minute budget: 52.6s of it is the bootstrap layer (apk go, toolchain fetch, compile) and 100s is image export. The check image grows to 683 MB because the Go toolchain and module cache stay in the bootstrap layer; that image is only ever built to run checks, never published or deployed.
24 lines
939 B
Docker
24 lines
939 B
Docker
# Hugo static-site build image. The build runs `make check` (a clean
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# `hugo --minify` production build, the `--printPathWarnings` lint
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# build, then the read-only prettier docs check), so the image build
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# fails on any formatting or Hugo build error. This is what CI
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# (script/cibuild) runs on every push.
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# alpine 3.21, 2026-02-28
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FROM alpine@sha256:c3f8e73fdb79deaebaa2037150150191b9dcbfba68b4a46d70103204c53f4709
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WORKDIR /src
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# Install build dependencies first so the layer caches until the
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# scripts change (script/bootstrap installs git, make, go, hugo,
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# node/npm). Hugo is not an apk package here: script/bootstrap builds
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# the exact pinned version with `go install`, hash-verified against
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# sum.golang.org, so the published artifact does not depend on whatever
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# hugo this base image's repos happen to serve.
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COPY script/ script/
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RUN script/bootstrap
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COPY . .
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# Run all checks - build fails if any check fails.
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RUN make check
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