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Create a dedicated WASI container#56

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Merged
corona10 merged 8 commits intopython:mainfrombrettcannon:wasicontainer
Oct 4, 2025
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29 changes: 27 additions & 2 deletions.github/workflows/ci.yml
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Original file line numberDiff line numberDiff line change
Expand Up@@ -19,7 +19,7 @@ jobs:
# Dummy tag; version does not matter.
TAG: cpython-devcontainer:1.0.0-${{ github.run_id }}
steps:
- name: Checkout Push to Registry action
- name: Checkout
uses: actions/checkout@v5
- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v3
Expand All@@ -32,6 +32,31 @@ jobs:
- name: Test clang
run: docker run --rm ${{ env.TAG }} clang --version

build_wasi_container:
name: Build and test (WASI container)
strategy:
fail-fast: false
matrix:
os: [ubuntu-latest, ubuntu-24.04-arm]
runs-on: ${{ matrix.os }}
env:
TAG: cpython-wasicontainer:1.0.0-${{ github.run_id }}
steps:
- name: Checkout
uses: actions/checkout@v5
- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v3
- name: Build Dockerfile
uses: docker/build-push-action@v6
with:
context: ./wasicontainer
load: true
tags: ${{ env.TAG }}
- name: Test WASI SDK
run: docker run --rm ${{ env.TAG }} /opt/wasi-sdk/bin/clang --version
- name: Test Wasmtime
run: docker run --rm ${{ env.TAG }} wasmtime --version

build_autoconf:
name: Build and test (Autoconf)
strategy:
Expand All@@ -43,7 +68,7 @@ jobs:
env:
TAG: autoconf:${{ matrix.autoconf_version }}-${{ github.run_id }}
steps:
- name: Checkout Push to Registry action
- name: Checkout
uses: actions/checkout@v5
- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v3
Expand Down
1 change: 1 addition & 0 deletions.github/workflows/release.yml
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Expand Up@@ -11,6 +11,7 @@ on:
options:
- autoconf
- devcontainer
- wasicontainer

run-name: "Release: ${{ inputs.package }}"

Expand Down
20 changes: 20 additions & 0 deletionswasicontainer/Dockerfile
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@@ -0,0 +1,20 @@
FROM ghcr.io/python/devcontainer:latest

LABEL org.opencontainers.image.base.name="ghcr.io/python/wasicontainer:latest"
LABEL org.opencontainers.image.source="https://github.com/python/cpython-devcontainers"
LABEL org.opencontainers.image.title="CPython WASI development container"
LABEL org.opencontainers.image.description="CPython development container with the tooling to work on WASI builds."
LABEL org.opencontainers.image.authors="Brett Cannon"

ARG TARGETARCH

# WASI SDK versions are controlled in install-wasi.sh.
ENV WASI_SDK_ROOT=/opt

ENV WASMTIME_VERSION=36.0.2
ENV WASMTIME_HOME=/opt/wasmtime

RUN mkdir -p /opt/cpython-devcontainer/bin
COPY --chmod=755 install-wasi.sh /opt/cpython-devcontainer/bin/

RUN /opt/cpython-devcontainer/bin/install-wasi.sh
3 changes: 3 additions & 0 deletionswasicontainer/README.md
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@@ -0,0 +1,3 @@
A container for developing CPython for WASI.

It is based on the dev container, and thus includes the same common utilities.
45 changes: 45 additions & 0 deletionswasicontainer/install-wasi.sh
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@@ -0,0 +1,45 @@
#! /bin/bash -ex

mkdir --parents ${WASI_SDK_ROOT}

# For 3.11, 3.12.
# There is no Arm support for WASI SDK < 23.
if [ "${TARGETARCH}" = "amd64" ]; then
URL=https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-16/wasi-sdk-16.0-linux.tar.gz
curl --location $URL | tar --directory ${WASI_SDK_ROOT} --extract --gunzip
fi

case "${TARGETARCH}" in
amd64) WASI_ARCH="x86_64" ;;
arm64) WASI_ARCH="arm64" ;;
*) echo "Unsupported TARGETARCH: ${TARGETARCH}" && exit 1 ;;
esac && \

# 24: 3.13, 3.14
# The URL format only works for WASI SDK >= 23.
WASI_SDK_VERSIONS=(24)
for VERSION in "${WASI_SDK_VERSIONS[@]}"; do
URL=https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${VERSION}/wasi-sdk-${VERSION}.0-${WASI_ARCH}-linux.tar.gz
curl --location $URL | tar --directory ${WASI_SDK_ROOT} --extract --gunzip
done

# For Python 3.13 as Tools/wasm/wasi.py expects /opt/wasi-sdk by default.
ln -s ${WASI_SDK_ROOT}/wasi-sdk-24.0*/ /opt/wasi-sdk


mkdir --parents ${WASMTIME_HOME}

case "${TARGETARCH}" in
amd64) WASMTIME_ARCH="x86_64" ;;
arm64) WASMTIME_ARCH="aarch64" ;;
*) echo "Unsupported TARGETARCH: ${TARGETARCH}" && exit 1 ;;
esac

URL="https://github.com/bytecodealliance/wasmtime/releases/download/v${WASMTIME_VERSION}/wasmtime-v${WASMTIME_VERSION}-${WASMTIME_ARCH}-linux.tar.xz"

curl --location $URL |
xz --decompress |
tar --strip-components 1 --directory ${WASMTIME_HOME} -x

# Put `wasmtime` on $PATH.
ln -s ${WASMTIME_HOME}/wasmtime* /usr/local/bin
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