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The Dockerfile builder stage takes ARG VERSION (default `dev`) and passes it to `make build` on the command line, which overrides the Makefile's `git describe` default. script/docker computes the version from `git describe` on the host and passes it as --build-arg VERSION, because .dockerignore leaves .git out of the build context and `git describe` inside the build only ever produced `dev`. A build that passes no argument, such as script/cibuild, still reports `dev`. `logger.Identify`, which logs `starting` with the version, was never called; `main` now calls it first, so the version is in the startup log. Model: opus-5-5
77 lines
2.8 KiB
Docker
77 lines
2.8 KiB
Docker
# Lint stage - fast feedback on lint issues, before the build starts.
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# The linter is invoked directly rather than through `make lint`: that
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# target shells out to `docker build -f Dockerfile.lint`, and there is
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# no docker daemon inside a docker build.
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# script/cibuild and script/docker name this stage in --no-cache-filter.
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# golangci/golangci-lint:v2.12.2 (Debian-based), 2026-08-10
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FROM golangci/golangci-lint:v2.12.2@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 make fmt-check
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RUN golangci-lint run --config .golangci.yml ./...
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# Build stage
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# script/cibuild and script/docker name this stage in --no-cache-filter.
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# golang 1.25-alpine, 2026-02-28
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FROM golang@sha256:f6751d823c26342f9506c03797d2527668d095b0a15f1862cddb4d927a7a4ced AS builder
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RUN apk add --no-cache git make gcc musl-dev binutils-gold
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# Force BuildKit to run the lint stage before proceeding
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COPY --from=lint /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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# Run the tests - build fails if any test fails
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RUN make test
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# Build the binary. .dockerignore leaves out .git, so `git describe` in
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# the Makefile cannot find the version here: script/docker passes it as
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# --build-arg VERSION, and a build that passes none reports `dev`.
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ARG VERSION=dev
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RUN make build VERSION="${VERSION}"
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# Runtime stage
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# alpine 3.21, 2026-02-28
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FROM alpine@sha256:c3f8e73fdb79deaebaa2037150150191b9dcbfba68b4a46d70103204c53f4709
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RUN apk add --no-cache ca-certificates tzdata su-exec
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COPY --from=builder /src/bin/dnswatcher /usr/local/bin/dnswatcher
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COPY deploy/docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
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# dnswatcher runs as this unprivileged user. The entrypoint creates the
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# data directory and gives it to this user on every start.
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RUN addgroup -S -g 10001 dnswatcher \
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&& adduser -S -G dnswatcher -u 10001 dnswatcher
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ENV DNSWATCHER_DATA_DIR=/var/lib/dnswatcher
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# Config loading also reads a `.env` file and a file named `dnswatcher`
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# (any config extension, or none) from the working directory. `/` holds
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# neither, so every setting comes from the environment. Do not make the
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# data directory, or the binary's directory, the working directory.
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WORKDIR /
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# No USER: the entrypoint must start as root to set up the data
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# directory; it then runs dnswatcher as the dnswatcher user.
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EXPOSE 8080
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# busybox wget (already in alpine) probes the health endpoint every 10
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# seconds, so the container is healthy well before upaas reads its health
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# 60 seconds after a deploy and fails the deploy unless it is healthy.
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HEALTHCHECK --interval=10s --timeout=5s --start-period=10s --retries=3 \
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CMD wget -q -O /dev/null "http://127.0.0.1:${PORT:-8080}/.well-known/healthcheck" || exit 1
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ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
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