Tyler J King
f3e1d161d0
Two-stage build. Builder stage: golang:1.23.6-bookworm (pinned to match the go directive in go.mod exactly), CGO_ENABLED=0, -trimpath and -s -w linker flags for reproducible, size-minimized static binaries. Compiles all four plugin binaries into /plugins/. Runtime stage: debian:bookworm-slim with the /plugins/ directory copied in and made world-readable. The image is inert — SPIRE server and agent Deployments consume it via an initContainer that runs `cp -r /plugins/ /opt/spire/plugins/` into a shared emptyDir volume, so no ENTRYPOINT is needed. Path: git.guildhouse.dev/tking/spire-plugins:v0.1.0. Not replacing Containerfile.dev, which remains the local-dev variant. Signed-off-by: Tyler J King <tking@guildhouse.dev>
47 lines
2.1 KiB
Docker
47 lines
2.1 KiB
Docker
# Guildhouse SPIRE Plugins — production image.
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#
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# This image is a passive binary container: it is not executed directly.
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# SPIRE server/agent Deployments mount an emptyDir volume and run an
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# initContainer from this image that copies /plugins/ into the shared
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# volume. The runtime layer therefore only needs the plugin binaries
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# themselves plus a minimal `cp` — distroless static-nonroot ships a
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# BusyBox-less runtime, so we use the bookworm slim minimal base here
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# which includes coreutils.
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#
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# Plugin binary paths are /plugins/<name>. SPIRE's HCL plugin_cmd
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# directive expects these exact paths.
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FROM golang:1.23.6-bookworm AS builder
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WORKDIR /src
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# Dependency cache layer — go.mod/go.sum copied first so we only redo
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# `go mod download` when module graph changes, not on every source edit.
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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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# Build each plugin binary into /plugins/. CGO disabled so the binaries
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# are statically linked and runnable from any base image.
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ENV CGO_ENABLED=0
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ENV GOOS=linux
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ENV GOARCH=amd64
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RUN mkdir -p /plugins && \
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go build -trimpath -ldflags="-s -w" -o /plugins/oidc-attestor ./cmd/oidc-attestor && \
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go build -trimpath -ldflags="-s -w" -o /plugins/ssh-credential-composer ./cmd/ssh-credential-composer && \
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go build -trimpath -ldflags="-s -w" -o /plugins/governance-notifier ./cmd/governance-notifier && \
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go build -trimpath -ldflags="-s -w" -o /plugins/substrate-keymanager ./cmd/substrate-keymanager
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FROM debian:bookworm-slim AS runtime
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# No shell commands needed at image boot — this image is inert. The
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# initContainer that uses it supplies its own `cp -r /plugins/ /opt/spire/plugins/`
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# command. We keep the binaries readable by any UID so SPIRE's
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# non-root user can read them out of the shared volume.
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COPY --from=builder /plugins/ /plugins/
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RUN chmod -R a+rx /plugins
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LABEL org.opencontainers.image.source="https://git.guildhouse.dev/tking/guildhouse-spire-plugins" \
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org.opencontainers.image.description="Guildhouse SPIRE plugins: oidc-attestor, ssh-credential-composer, governance-notifier, substrate-keymanager" \
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org.opencontainers.image.licenses="Apache-2.0"
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