Dockerfile.test

# Minimal test: verify sccache works inside Docker with BuildKit cache mounts
# Based on the same rust:trixie base as the real Containerfile

FROM docker.io/library/rust:trixie AS test

# Install sccache
RUN cargo install sccache --locked

# sccache config
ENV RUSTC_WRAPPER=sccache
ENV SCCACHE_DIR=/sccache
ENV SCCACHE_IDLE_TIMEOUT=0
ENV CARGO_INCREMENTAL=0
ENV CARGO_TERM_COLOR=always

WORKDIR /app

# Copy manifests only for dependency caching
COPY Cargo.toml Cargo.lock ./
RUN mkdir -p src && touch src/lib.rs

# First build: should be cold (all misses)
RUN --mount=type=cache,target=/sccache \
    --mount=type=cache,target=/usr/local/cargo/registry \
    --mount=type=cache,target=/usr/local/cargo/git \
    cargo build --release 2>&1 && \
    echo "=== COLD BUILD DONE ===" && \
    sccache --show-stats

# Second build: should show cache hits (external deps already cached)
RUN --mount=type=cache,target=/sccache \
    --mount=type=cache,target=/usr/local/cargo/registry \
    --mount=type=cache,target=/usr/local/cargo/git \
    cargo build --release 2>&1 && \
    echo "=== WARM BUILD DONE ===" && \
    sccache --show-stats