50 lines
2.0 KiB
Docker
50 lines
2.0 KiB
Docker
# Builder pin and go.mod directive are the same patch release deliberately;
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# an older builder reports the mismatch only after downloading the module graph.
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ARG GO_VERSION=1.27.1
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# The builder runs natively and cross-compiles, so foreign platforms need no emulation.
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FROM --platform=$BUILDPLATFORM docker.io/library/golang:${GO_VERSION}-alpine AS build
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WORKDIR /src
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COPY go.mod go.sum ./
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# The optional build_ca secret adds a CA (an intercepting proxy's) for this step
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# only: Go reads SSL_CERT_DIR besides the system bundle, and a secret mount
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# never reaches a layer. Proxy variables are Docker's predefined build args.
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RUN --mount=type=secret,id=build_ca,target=/run/build-ca/ca.pem \
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SSL_CERT_DIR=/run/build-ca go mod download
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COPY . .
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# No defaults: a declared default would override the platform BuildKit passes.
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ARG TARGETOS
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ARG TARGETARCH
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ARG VERSION=dev
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ARG REVISION=unknown
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ARG BUILD_TIME=unknown
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# REVISION identifies the commit: the context has no .git, so no VCS stamping.
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RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} \
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go build -trimpath -buildvcs=false \
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-ldflags="-s -w -X logwisp/internal/version.Version=${VERSION} -X logwisp/internal/version.GitCommit=${REVISION} -X logwisp/internal/version.BuildTime=${BUILD_TIME}" \
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-o /out/lw ./cmd/lw
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FROM scratch
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ARG VERSION=dev
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ARG REVISION=unknown
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LABEL org.opencontainers.image.title="logwisp" \
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org.opencontainers.image.description="Log transport: sources, flow, sinks" \
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org.opencontainers.image.source="https://github.com/lixenwraith/logwisp" \
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org.opencontainers.image.revision="${REVISION}" \
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org.opencontainers.image.version="${VERSION}" \
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org.opencontainers.image.licenses="BSD-3-Clause"
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# Dialers without tls.ca_file, and `lw auth` without -ca-file, verify against system roots.
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COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
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COPY --from=build /out/lw /lw
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# Numeric identity is required in scratch and satisfies a restricted pod spec.
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USER 65532:65532
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ENTRYPOINT ["/lw"]
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