entrypoint script

Author: OpenGG

Dockerfile

@@ -5,9 +5,12 @@ LABEL maintainer="OpenGG <[email protected]>"
 # Compiling Rust to Wasm with the LLVM wasm-backend (without Emscripten)
 # https://gist.github.com/LukasKalbertodt/821ab8b85a25f4c54544cc43bed2c39f
 
-# source
-RUN sed -i "s|deb.debian.org|mirrors.ustc.edu.cn|" /etc/apt/sources.list \
-  && sed -i "s|security.debian.org|mirrors.ustc.edu.cn/debian-security|" /etc/apt/sources.list \
+ADD "rust-wasm.sh" /usr/local/bin/
+
+RUN chmod +x rust-wasm.sh \
+  # apt source
+  # && sed -i "s|deb.debian.org|mirrors.ustc.edu.cn|" /etc/apt/sources.list \
+  # && sed -i "s|security.debian.org|mirrors.ustc.edu.cn/debian-security|" /etc/apt/sources.list \
   # deps
   && apt-get update \
   && apt-get install -y git build-essential cmake curl g++ python \
@@ -40,11 +43,11 @@ RUN sed -i "s|deb.debian.org|mirrors.ustc.edu.cn|" /etc/apt/sources.list \
   # clean
   && apt-get autoclean \
   && apt-get clean \
-  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /rust-wasm
 
-ENV PATH /rust-wasm-bin/llvm/bin:/rust-wasm-bin/binaryen/bin:${PATH}
+ENV PATH /root/.cargo/bin:/rust-wasm-bin/llvm/bin:/rust-wasm-bin/binaryen/bin:${PATH}
 
 VOLUME ["/work"]
 WORKDIR /work
 
-CMD ["bash"]
+ENTRYPOINT [ "rust-wasm.sh" ]

rust-wasm.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# https://gist.github.com/LukasKalbertodt/821ab8b85a25f4c54544cc43bed2c39f
+
+# Super simple script to compile Rust to wasm. Usage:
+# ./rust-wasm.sh foo.rs
+
+if [ -z ${1+x} ]; then
+  echo "missing argument: rust source file"
+  exit 1
+fi
+
+BASENAME="${1%.rs}"
+
+INPUT="${BASENAME}.rs"
+
+if [ ! -f "${INPUT}" ]; then
+    echo "File not found: ${INPUT}"
+fi
+
+rustc -O --crate-type=lib --emit=llvm-bc -C opt-level=3 "${INPUT}" && \
+  llc -march=wasm32 "${BASENAME}.bc" && \
+  s2wasm -o "${BASENAME}.wast" "${BASENAME}.s" && \
+  wasm-as "${BASENAME}.wast"