# Multi-stage build for the Rust finger service
# Build stage
FROM rust:slim AS builder

WORKDIR /app
COPY . .

RUN cargo build --release
RUN cargo test --release

# Runtime stage — match the C++ image's base so OS-level overhead (syscalls,
# libc) is comparable between the two for benchmarking.
FROM ubuntu:24.04

ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update && apt-get install -y --no-install-recommends \
    netcat-openbsd \
    && rm -rf /var/lib/apt/lists/* \
    && (userdel -r ubuntu 2>/dev/null || true) \
    && groupadd -g 1000 finger \
    && useradd -m -u 1000 -g finger -s /bin/sh finger

COPY --from=builder /app/target/release/finger /usr/local/bin/finger
RUN chmod +x /usr/local/bin/finger

RUN mkdir -p /var/finger/users && \
    chown -R finger:finger /var/finger

USER finger

EXPOSE 79

HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD nc -w 1 127.0.0.1 79 < /dev/null || exit 1

LABEL org.opencontainers.image.title="finger"
LABEL org.opencontainers.image.description="A silly finger service written in Rust"
LABEL org.opencontainers.image.source="https://github.com/waffle2k/finger"
LABEL org.opencontainers.image.licenses="MIT"

CMD ["finger"]