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A plain `docker build .`, which is how upaas builds, stamped `dev`: `.dockerignore` left out `.git` and the builder declared `ARG VERSION=dev`. `.dockerignore` now sends `.git` without `.git/config`, which can hold a credential, and lists no tracked file, which git would count as deleted. `ARG VERSION` has no default. The Makefile takes a non-empty `VERSION` from the command line or the environment, so a build arg still wins; otherwise `git describe` runs in the builder, which trusts the checkout whoever owns it, as a context sent as a tar archive keeps its owners. A new `make version` prints the version; the build fails when the context carries `.git` and it comes out empty, `dev` or `unknown`. Model: opus-5-5
99 lines
3.6 KiB
Docker
99 lines
3.6 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. For the same reason this stage
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# runs only the Go half of `make fmt-check`; script/cibuild runs the
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# markdown half after this 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 script/fmt-check-go
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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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# A build context sent as a tar archive keeps its files' owners, and git
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# refuses to read a checkout owned by another user. Trust this one
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# whoever owns it.
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RUN git config --system --add safe.directory /src
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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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# Version stamped into the binary: the VERSION build arg when one is
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# given and not empty (script/docker passes one), otherwise what
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# `git describe` says of the .git in the build context, so a plain
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# `docker build .` of a clone stamps its tag or short commit. The build
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# arg reaches make through the environment.
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ARG VERSION
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# A context that carries .git, as a directory or as a file, must yield a
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# real version: one that is empty, `dev` or `unknown` cannot be traced
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# back to a commit.
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RUN version="$(make version)"; \
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if [ -e .git ]; then \
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case "$version" in \
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"" | dev | unknown) \
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echo "version is \"$version\" although the build context carries .git" >&2; \
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exit 1 ;; \
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esac; \
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fi
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RUN make build
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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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