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The Dockerfile's last stage is now the image of "Deployment" in SPEC.md: Ubuntu 26.04 with ca-certificates, nix-bin and runit from a dated snapshot whose InRelease files are checked by hash, nixpkgs from its release file checked by SHA-256, runsvinit built at a fixed commit, and smallwebwaf as a runit service. smallwebwaf answers /_smallwebwaf/healthz, and `smallwebwaf healthcheck`, which takes no further argument, is the image's HEALTHCHECK. script/example-app builds an app on the image and checks it end to end. The Nix profile comes last on the PATH: first, busybox from nixpkgs replaced runit's own runsvdir and sv. SPEC.md is corrected to match what was built. Model: opus-5-5
150 lines
6.5 KiB
Docker
150 lines
6.5 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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# golangci/golangci-lint v2.12.2 (built with go1.26.2), 2026-05-06
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FROM golangci/golangci-lint@sha256:5cceeef04e53efe1470638d4b4b4f5ceefd574955ab3941b2d9a68a8c9ad5240 AS lint
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WORKDIR /src
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COPY go.mod go.sum ./
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RUN go mod download
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COPY . .
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RUN golangci-lint run --config .golangci.yml ./...
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# Test phase, same shape and for the same reason. The go directive in
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# go.mod is a minimum, so this Go may be newer than the linter's. The
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# Debian image rather than the Alpine one, because the race detector
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# needs the C compiler it carries.
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#
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# golang 1.27.1-trixie, 2026-09-19
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FROM golang@sha256:3b77fc618ec235a1ab412de7737f120dd507c57e8d87de4cbb7994fb94275ed5 AS test
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WORKDIR /src
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COPY go.mod go.sum ./
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RUN go mod download
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COPY . .
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RUN go test -count=1 -timeout 90s -race -cover ./... || \
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{ echo "--- Rerunning with -v for details ---"; \
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go test -count=1 -timeout 90s -race -v ./...; exit 1; }
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# Build stage. Nothing is wanted from the two phases above; the copies
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# are what make BuildKit build them first, so the image, which needs this
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# stage, cannot be produced unless lint and test passed.
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#
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# golang 1.27.1-trixie, 2026-09-19
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FROM golang@sha256:3b77fc618ec235a1ab412de7737f120dd507c57e8d87de4cbb7994fb94275ed5 AS builder
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COPY --from=lint /src/go.sum /dev/null
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COPY --from=test /src/go.sum /dev/null
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WORKDIR /src
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COPY go.mod go.sum ./
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RUN go mod download
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COPY . .
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# The version is computed on the host and passed in, because
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# .dockerignore excludes .git.
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ARG VERSION=dev
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RUN CGO_ENABLED=0 go build -trimpath \
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-ldflags="-s -w -X main.Version=${VERSION}" \
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-o /usr/local/bin/smallwebwaf ./cmd/smallwebwaf
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# runsvinit, the image's entrypoint, built at the last commit of its
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# archived repository. It has no go.mod, and `go build` of its directory
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# needs one; it uses only the standard library, so the one written here
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# names nothing else.
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#
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# golang 1.27.1-trixie, 2026-09-19
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FROM golang@sha256:3b77fc618ec235a1ab412de7737f120dd507c57e8d87de4cbb7994fb94275ed5 AS runsvinit
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RUN git clone --quiet https://github.com/peterbourgon/runsvinit /src
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WORKDIR /src
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# runsvinit v2.0.0-8-gb4b2c78, 2015-10-07
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RUN git checkout --quiet --detach b4b2c785308b1ce785b6155c7fe5f16879080193 \
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&& go mod init github.com/peterbourgon/runsvinit \
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&& CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" \
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-o /usr/local/bin/runsvinit .
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# The image an app's Dockerfile builds FROM, described under "Deployment"
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# in SPEC.md. It is the last stage, so a plain `docker build .` builds it.
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#
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# ubuntu 26.04, 2026-09-27
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FROM ubuntu@sha256:f144425ff09be612d6d9ad965196e9cdc23dae1f42110a8a11a3e9a8198759f7
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# ca-certificates, nix-bin and runit, from Ubuntu's archive as it was at
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# the snapshot moment, which is never earlier than the Ubuntu image above.
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# apt checks every package against the snapshot's InRelease files, and
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# this step checks those against the hashes named here, which are those
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# of the amd64 archive: other architectures use Ubuntu's ports archive.
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# apt also fetches the live archive's InRelease files, which change daily
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# and which the install does not use. The snapshot service is HTTPS only
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# and this image has no CA certificates yet, so this step uses the Go
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# image's.
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RUN --mount=type=bind,from=builder,source=/etc/ssl/certs/ca-certificates.crt,target=/tmp/go-image-ca.crt \
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apt-get update --snapshot 20261001T000000Z \
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-o Acquire::https::CaInfo=/tmp/go-image-ca.crt \
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&& printf '%s\n' \
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'45f95ce276cdba3e41870516a130e03c58b8b7a79e9546b0efe9e526d255740c snapshot.ubuntu.com_ubuntu_20261001T000000Z_dists_resolute_InRelease' \
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'802e675dd9de4c7f3916434a95e7c1d8eec0e82886622d7805ab19a2c6fe0365 snapshot.ubuntu.com_ubuntu_20261001T000000Z_dists_resolute-updates_InRelease' \
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'64b3353f0bd4970b4f7271962245bcea9ff24d4cc7bea16b433f8a60e42ca3dd snapshot.ubuntu.com_ubuntu_20261001T000000Z_dists_resolute-backports_InRelease' \
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'1d5041572116a8b23aabf79ac7439ad8af83d57ad3fb0f9aa0d4523ec10c5908 snapshot.ubuntu.com_ubuntu_20261001T000000Z_dists_resolute-security_InRelease' \
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| (cd /var/lib/apt/lists && sha256sum --check --strict) \
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&& DEBIAN_FRONTEND=noninteractive apt-get install --yes --no-install-recommends \
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--snapshot 20261001T000000Z \
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-o Acquire::https::CaInfo=/tmp/go-image-ca.crt \
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ca-certificates nix-bin runit \
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&& rm -rf /var/lib/apt/lists/*
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# Nix run by root expects a group of build users, which nix-bin does not
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# create; with the setting empty, root's builds run without them.
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RUN mkdir /etc/nix && echo 'build-users-group =' > /etc/nix/nix.conf
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# nixpkgs, from its release file, checked by SHA-256, and set up for root
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# as `nixpkgs`, so that an app's Dockerfile installs a package with
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# `nix-env -iA nixpkgs.<name>`. curl and xz come with nix-bin.
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#
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# nixpkgs nixos-26.05.11045.774debe7a0d1, 2026-10-02
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RUN curl -fsSL -o /tmp/nixexprs.tar.xz \
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https://releases.nixos.org/nixos/26.05/nixos-26.05.11045.774debe7a0d1/nixexprs.tar.xz \
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&& echo 'b2994104605601690023a5a6a3bb5a07b2bd1716b4e3b208cba1056dacd2ab08 /tmp/nixexprs.tar.xz' \
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| sha256sum --check --strict \
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&& mkdir -p /root/.nix-defexpr/nixpkgs \
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&& tar -xJf /tmp/nixexprs.tar.xz -C /root/.nix-defexpr/nixpkgs --strip-components=1 \
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&& rm /tmp/nixexprs.tar.xz
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# What root installs with nix-env lands in root's profile. This path to
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# it works for every user, unlike /root/.nix-profile: only root can
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# enter /root. It comes last, so that no package shadows the image's
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# own tools: busybox, for one, brings an sv that looks for services
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# elsewhere.
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ENV PATH=${PATH}:/nix/var/nix/profiles/default/bin
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COPY --from=runsvinit /usr/local/bin/runsvinit /usr/local/bin/runsvinit
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COPY --from=builder /usr/local/bin/smallwebwaf /usr/local/bin/smallwebwaf
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RUN groupadd --system --gid 65532 smallwebwaf \
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&& useradd --system --uid 65532 --gid smallwebwaf --no-create-home \
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--shell /usr/sbin/nologin smallwebwaf
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# runsvinit starts runit's runsvdir on /etc/service, where Ubuntu's sv
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# looks too.
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COPY --chmod=755 share/smallwebwaf.run /etc/service/smallwebwaf/run
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EXPOSE 8080
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# traefik sends a container no requests until it is healthy, so the
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# check runs every second from the start until it first passes, for up
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# to a minute, and every 30 seconds after that.
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HEALTHCHECK --start-period=1m --start-interval=1s \
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CMD ["/usr/local/bin/smallwebwaf", "healthcheck"]
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ENTRYPOINT ["/usr/local/bin/runsvinit"]
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