Graham McIntire
08175fc6ae
Add Dockerfile.ci that extends the hexpm/elixir image with precompiled EXLA NIF cached at ~/.cache/xla/. When mix test runs, EXLA's cached_make finds the precompiled libexla.so and skips the OOM-prone g++ C++ compilation entirely. - Dockerfile.ci: two-stage build — builder compiles EXLA into cache; final stage copies the cache and installs test deps (cdo) - .forgejo/workflows/build-ci-image.yaml: builds and pushes prop-ci image on mix.exs/mix.lock/vendor changes + weekly cron - .forgejo/workflows/build.yaml: test step uses prop-ci:latest instead of raw hexpm/elixir image, removing apt-get + hex/rebar install steps
67 lines
2.6 KiB
Text
67 lines
2.6 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 cached at ~/.cache/xla/
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#
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# When mix test runs with this image, EXLA's cached_make finds the
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# precompiled libexla.so and skips the OOM-prone g++ C++ compilation
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# entirely. Rebuild this image whenever mix.exs changes elixir/exla/xla
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# versions or c_src/ files change (the cache key auto-invalidates).
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#
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# Built by .forgejo/workflows/build-ci-image.yaml.
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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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# Install build tools and runtime test deps (cdo is needed by tests).
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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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# Install hex + rebar
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RUN mix local.hex --force && mix local.rebar --force
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# Precompile EXLA to populate ~/.cache/xla/ with both the downloaded
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# XLA archive and the compiled libexla.so. We only need mix.exs +
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# mix.lock + vendor + minimal config — no full project checkout.
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WORKDIR /tmp/exla_warm
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# Copy only what's needed for deps.get + deps.compile exla
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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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# Minimal config — nx needs :default_backend to exist
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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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# Fetch deps and compile EXLA. The cached_make compiler downloads the XLA
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# archive, extracts it, compiles the C++ NIF, and caches libexla.so at
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# ~/.cache/xla/exla/{cache_key}/libexla.so. This layer is cached by
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# Docker until mix.exs/mix.lock/vendor change.
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RUN mix deps.get && mix deps.compile exla
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# Clean up the temp project — the cache in ~/.cache/xla/ persists in
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# the image and is what matters.
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RUN rm -rf /tmp/exla_warm
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FROM ${ELIXIR_IMAGE} AS final
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# Install runtime test deps
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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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# Install hex + rebar
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RUN mix local.hex --force && mix local.rebar --force
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# Copy the precompiled EXLA cache from the builder stage. This is the
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# ~/.cache/xla/ directory containing the XLA archive download and the
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# compiled libexla.so keyed by exact Elixir/ERTS/exla/xla/c_src versions.
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COPY --from=builder /root/.cache/xla /root/.cache/xla
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WORKDIR /app
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