85 lines
4.5 KiB
Docker
85 lines
4.5 KiB
Docker
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# Builds `mobitool.wasm` — libmobi's mobitool compiled to wasm32-wasi — used by
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# the in-process Kindle->EPUB converter (internal/ebookconvert) via wazero.
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#
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# The output is architecture-independent wasm32 bytecode: build it on any host
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# (CI is amd64), run it on any server arch through wazero (pure Go).
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#
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# Build + extract the artifact:
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# docker build --platform linux/amd64 -t mobitool-wasm tools/mobitool-wasm
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# id=$(docker create mobitool-wasm); docker cp "$id:/out/mobitool.wasm" \
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# internal/ebookconvert/mobitool.wasm; docker rm "$id"
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#
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# Pins (bump deliberately; the converter cache key includes these):
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# wasi-sdk 25.0 · libmobi 906274205c11944b628da1c553b255acb1af7c55 · zlib 1.3.1
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#
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# Proven build config (see ../../docs/superpowers/specs/2026-06-17-kindle-epub-conversion-design.md):
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# --with-libxml2=no -> internal xmlwriter provides OPF/EPUB support (-e)
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# zlib built to wasm -> avoids libmobi's bundled-miniz duplicate-symbol clash
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# with mobitool's own miniz (EPUB zip) at wasm-ld time.
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FROM debian:bookworm-slim AS build
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ARG WASI_SDK_VERSION=25
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ARG LIBMOBI_COMMIT=906274205c11944b628da1c553b255acb1af7c55
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ARG ZLIB_VERSION=1.3.1
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RUN apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends \
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build-essential autoconf automake libtool pkg-config git curl ca-certificates xz-utils \
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&& rm -rf /var/lib/apt/lists/*
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# --- wasi-sdk (clang + wasm32-wasi sysroot) ---
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RUN cd /opt \
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&& curl -fsSL -o wasi-sdk.tar.gz \
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"https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_SDK_VERSION}/wasi-sdk-${WASI_SDK_VERSION}.0-x86_64-linux.tar.gz" \
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&& tar xzf wasi-sdk.tar.gz && mv "wasi-sdk-${WASI_SDK_VERSION}.0-x86_64-linux" wasi-sdk && rm wasi-sdk.tar.gz
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ENV WASI=/opt/wasi-sdk
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ENV SYSROOT=/opt/wasi-sdk/share/wasi-sysroot
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# --- zlib -> wasm (compile sources directly; zlib's configure runs target binaries) ---
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RUN cd /opt \
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&& curl -fsSL -o zlib.tar.gz "https://github.com/madler/zlib/releases/download/v${ZLIB_VERSION}/zlib-${ZLIB_VERSION}.tar.gz" \
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&& tar xzf zlib.tar.gz && cd "zlib-${ZLIB_VERSION}" \
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&& for s in adler32 compress crc32 deflate gzclose gzlib gzread gzwrite infback inffast inflate inftrees trees uncompr zutil; do \
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"$WASI/bin/clang" -O2 --sysroot="$SYSROOT" -DHAVE_UNISTD_H -c "$s.c" -o "$s.o"; done \
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&& "$WASI/bin/llvm-ar" rcs libz.a *.o \
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&& mkdir -p /opt/zlibwasm/lib /opt/zlibwasm/include \
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&& cp libz.a /opt/zlibwasm/lib/ && cp zlib.h zconf.h /opt/zlibwasm/include/
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# --- libmobi + mobitool -> wasm ---
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RUN mkdir -p /work && cd /work \
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&& git clone https://github.com/bfabiszewski/libmobi.git && cd libmobi \
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&& git checkout "${LIBMOBI_COMMIT}" \
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&& ./autogen.sh \
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&& ./configure --host=wasm32-wasi \
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--with-libxml2=no --disable-shared --enable-static \
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CC="$WASI/bin/clang" AR="$WASI/bin/llvm-ar" RANLIB="$WASI/bin/llvm-ranlib" \
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CFLAGS="-O2 --sysroot=$SYSROOT -I/opt/zlibwasm/include" \
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CPPFLAGS="-I/opt/zlibwasm/include" \
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LDFLAGS="--sysroot=$SYSROOT -L/opt/zlibwasm/lib" \
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LIBS="-lz" \
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&& make -j"$(nproc)" \
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&& mkdir -p /out && cp tools/mobitool /out/mobitool.wasm \
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&& sha256sum /out/mobitool.wasm | tee /out/mobitool.wasm.sha256
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# Smoke test: convert a bundled libmobi sample to EPUB using a pinned,
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# checksum-verified wasmtime — NOT the `curl | bash` convenience installer, which
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# is documented as interactive-only and unsafe/non-deterministic for builds — so
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# the build fails loudly if the wasm can't actually convert.
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ARG WASMTIME_VERSION=27.0.0
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ARG WASMTIME_SHA256=74678f6ec49d8b858ca5181d5492b967245f6c072b5763ea14a75eee1ad3c2d7
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RUN cd /opt \
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&& curl -fsSL -o wasmtime.tar.xz \
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"https://github.com/bytecodealliance/wasmtime/releases/download/v${WASMTIME_VERSION}/wasmtime-v${WASMTIME_VERSION}-x86_64-linux.tar.xz" \
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&& echo "${WASMTIME_SHA256} wasmtime.tar.xz" | sha256sum -c - \
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&& tar xJf wasmtime.tar.xz && rm wasmtime.tar.xz \
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&& WASMTIME="/opt/wasmtime-v${WASMTIME_VERSION}-x86_64-linux/wasmtime" \
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&& mkdir -p /smoke/out \
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&& cp /work/libmobi/tests/samples/sample-ncx.mobi /smoke/in.mobi \
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&& "$WASMTIME" run --dir=/smoke::/smoke /out/mobitool.wasm -e -o /smoke/out /smoke/in.mobi \
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&& test -f /smoke/out/in.epub \
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&& echo "SMOKE OK: $(wc -c < /smoke/out/in.epub) byte EPUB produced"
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FROM scratch AS artifact
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COPY --from=build /out/mobitool.wasm /mobitool.wasm
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COPY --from=build /out/mobitool.wasm.sha256 /mobitool.wasm.sha256
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