# syntax=docker/dockerfile:1

FROM --platform=$BUILDPLATFORM rust:1-slim AS builder

ARG TARGETARCH

RUN set -eu; \
    case "${TARGETARCH}" in \
        amd64) rust_target=x86_64-unknown-linux-musl; cross_packages="" ;; \
        arm64) rust_target=aarch64-unknown-linux-musl; cross_packages="gcc-aarch64-linux-gnu" ;; \
        *) echo "unsupported target architecture: ${TARGETARCH}" >&2; exit 1 ;; \
    esac; \
    printf '%s\n' "${rust_target}" > /tmp/rust-target; \
    sed -i 's|http://deb.debian.org|https://deb.debian.org|g' \
        /etc/apt/sources.list.d/debian.sources 2>/dev/null || true; \
    apt-get update; \
    apt-get install -y --no-install-recommends musl-tools ca-certificates ${cross_packages}; \
    rm -rf /var/lib/apt/lists/*; \
    rustup target add "${rust_target}"

WORKDIR /app
COPY Cargo.toml Cargo.lock ./
RUN --mount=type=cache,target=/usr/local/cargo/registry \
    mkdir -p src \
 && printf 'fn main() {}' > src/main.rs \
 && cargo fetch --locked --target "$(cat /tmp/rust-target)"

COPY src ./src
RUN --mount=type=cache,target=/usr/local/cargo/registry \
    --mount=type=cache,target=/app/target \
    if [ "${TARGETARCH}" = "arm64" ]; then \
        export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER=aarch64-linux-gnu-gcc; \
    fi \
 && rust_target="$(cat /tmp/rust-target)" \
 && cargo build --release --locked --target "${rust_target}" \
 && mkdir -p /out \
 && cp "/app/target/${rust_target}/release/hermes" /out/hermes

FROM scratch AS runtime

COPY --from=builder /out/hermes /usr/local/bin/hermes
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt

ENV HERMES_CONFIG_PATH=/etc/hermes/hermes.yaml
WORKDIR /etc/hermes
USER 65532:65532
EXPOSE 8080 1080
ENTRYPOINT ["/usr/local/bin/hermes"]