Graham McIntire
af648c0330
EXLA's cached_make copies libexla.so but Make still compiles .o files when they're missing from deps/exla/cache/ (they don't survive mix deps.get). Save the pre-built cache/ directory at /opt/exla-cache/ in the CI image and restore it after mix deps.get in the test step. With both .o files and libexla.so present, Make skips all C++ compilation.
62 lines
2.2 KiB
Text
62 lines
2.2 KiB
Text
# syntax=docker/dockerfile:1.6
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#
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# Pre-built CI test image. Extends the hexpm/elixir image with:
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# * build-essential + git + curl + ca-certificates + cdo
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# * hex + rebar
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# * Precompiled EXLA NIF + object files at /opt/exla-cache/
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#
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# EXLA's cached_make copies libexla.so to deps/exla/cache/, but Make
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# still tries to compile .o files when they're missing (they don't
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# survive mix deps.get). We save the full cache/ directory and restore
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# it in the test step before mix test runs.
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#
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# Rebuild whenever mix.exs changes elixir/exla/xla versions or c_src/
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# files change (the cache key auto-invalidates).
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#
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# Built by .forgejo/workflows/build.yaml (build-ci-image job).
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ARG ELIXIR_IMAGE="docker.io/hexpm/elixir:1.20.1-erlang-29.0.2-debian-trixie-20260518-slim"
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FROM ${ELIXIR_IMAGE} AS builder
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RUN export DEBIAN_FRONTEND=noninteractive && \
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apt-get update -qq && \
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apt-get install -y -qq git curl ca-certificates build-essential cdo && \
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rm -rf /var/lib/apt/lists/*
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RUN mix local.hex --force && mix local.rebar --force
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WORKDIR /tmp/exla_warm
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COPY mix.exs mix.lock /tmp/exla_warm/
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COPY vendor /tmp/exla_warm/vendor
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RUN mkdir -p /tmp/exla_warm/config && \
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printf 'import Config\nconfig :nx, :default_backend, EXLA.Backend\n' > /tmp/exla_warm/config/config.exs
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# Compile all deps. EXLA's cached_make downloads the XLA archive, compiles
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# the C++ NIF, and caches libexla.so at ~/.cache/xla/exla/{key}/.
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RUN mix deps.get && mix deps.compile
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# Save the full build cache (libexla.so + .o files + xla_extension lib)
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# so Make finds all targets already built when restored in the test step.
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RUN mkdir -p /opt/exla-cache && \
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cp -a deps/exla/cache /opt/exla-cache/cache
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FROM ${ELIXIR_IMAGE} AS final
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RUN export DEBIAN_FRONTEND=noninteractive && \
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apt-get update -qq && \
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apt-get install -y -qq git curl ca-certificates build-essential cdo && \
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rm -rf /var/lib/apt/lists/*
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RUN mix local.hex --force && mix local.rebar --force
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# XLA archive download + cached libexla.so (cached_make fast path).
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COPY --from=builder /root/.cache/xla /root/.cache/xla
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# Pre-built EXLA object files + libexla.so + xla_extension/ lib.
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# Restored in the test step: cp -a /opt/exla-cache/cache /app/deps/exla/cache
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COPY --from=builder /opt/exla-cache /opt/exla-cache
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WORKDIR /app
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