Dockerfile.alpine

# Alpine-based lightweight image
FROM alpine:3.18 AS builder

# Install build dependencies
RUN apk add --no-cache \
    build-base \
    cmake \
    ninja \
    jsoncpp-dev \
    git

WORKDIR /app
COPY . .

# Build with static linking for Alpine
RUN cmake -B build -G Ninja \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_EXE_LINKER_FLAGS="-static" && \
    cmake --build build --config Release

# Runtime stage
FROM alpine:3.18

# Install runtime dependencies
RUN apk add --no-cache \
    iproute2 \
    iptables \
    bind-tools \
    iputils \
    traceroute \
    netcat-openbsd

# Copy binary
COPY --from=builder /app/build/netmgr /usr/local/bin/netmgr

# Create user and directories
RUN addgroup -S netmgr && adduser -S netmgr -G netmgr && \
    mkdir -p /etc/netmgr /var/log/netmgr && \
    chown netmgr:netmgr /etc/netmgr /var/log/netmgr

USER netmgr
ENTRYPOINT ["/usr/local/bin/netmgr"]
CMD ["--help"]