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Bootstrap riscv64 CPython build & release pipeline
Adds two workflows: - build-python.yml: workflow_dispatch per CPython tag on ubuntu-24.04-riscv, builds standard (+ optional --disable-gil for 3.13+), packages as python-<ver>-linux-24.04-riscv64[-freethreaded].tar.gz following the actions/python-versions layout (bin/ include/ lib/ share/ setup.sh build_output.txt tools_structure.txt), and publishes/uploads to a GitHub Release tagged with the normalised version. - check-releases.yml: scheduled poll of python/cpython tags (3.10+ stable plus a/b/rc prereleases), de-duplicates against existing releases, and fan-out dispatches build-python.yml with a max_dispatches cap. Vendors actions/python-versions' nix-setup-template.sh so extracted tarballs are drop-in compatible with setup-python's toolcache layout.
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‎.github/workflows/build-python.yml‎

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name: Build Python
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on:
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workflow_dispatch:
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inputs:
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cpython_tag:
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description: "CPython git tag to build (e.g. v3.12.13, v3.15.0a7)"
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required: true
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type: string
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freethreaded:
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description: "Also build a --disable-gil variant (3.13+)"
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required: false
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default: false
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type: boolean
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permissions:
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contents: write
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defaults:
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run:
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shell: bash --noprofile --norc -exo pipefail {0}
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jobs:
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build:
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runs-on: ubuntu-24.04-riscv
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env:
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CPYTHON_TAG: ${{ inputs.cpython_tag }}
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FREETHREADED: ${{ inputs.freethreaded }}
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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steps:
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- name: Checkout this repo
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uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
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- name: Install build dependencies
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run: |
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sudo apt-get update -qq
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sudo apt-get install -qq -y --no-install-recommends \
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build-essential \
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ca-certificates \
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g++-14 \
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gcc-14 \
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git \
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libbz2-dev \
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libexpat1-dev \
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libffi-dev \
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libgdbm-dev \
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liblzma-dev \
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libncursesw5-dev \
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libreadline-dev \
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libsqlite3-dev \
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libssl-dev \
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make \
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patchelf \
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pkg-config \
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tk-dev \
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uuid-dev \
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wget \
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xz-utils \
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zlib1g-dev
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# Make sure Python is built with gcc 14
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echo "CC=gcc-14" >> $GITHUB_ENV
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echo "CXX=g++-14" >> $GITHUB_ENV
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- name: Compute normalised version
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id: vars
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run: |
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set -euo pipefail
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tag="$CPYTHON_TAG"
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# Strip leading v, expand a/b/rc suffixes
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normalised="${tag#v}"
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normalised="$(echo "$normalised" | sed -E 's/a([0-9]+)$/-alpha.\1/; s/b([0-9]+)$/-beta.\1/; s/rc([0-9]+)$/-rc.\1/')"
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# X.Y
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minor_num="$(echo "$normalised" | cut -d. -f2)"
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minor="3.${minor_num}"
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echo "normalised=${normalised}" >> "$GITHUB_OUTPUT"
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echo "minor=${minor}" >> "$GITHUB_OUTPUT"
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echo "minor_num=${minor_num}" >> "$GITHUB_OUTPUT"
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echo "archive_base=python-${normalised}-linux-24.04-riscv64" >> "$GITHUB_OUTPUT"
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echo "Normalised version: ${normalised}"
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echo "Python X.Y: ${minor}"
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if [ "${FREETHREADED}" = "true" ] && [ "${minor_num}" -lt 13 ]; then
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echo "ERROR: freethreaded build requires CPython 3.13+" >&2
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exit 1
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fi
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- name: Checkout CPython
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run: git clone --depth 1 --branch "$CPYTHON_TAG" https://github.com/python/cpython.git src
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- name: Build standard CPython
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env:
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MINOR: ${{ steps.vars.outputs.minor }}
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ARCHIVE_BASE: ${{ steps.vars.outputs.archive_base }}
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NORMALISED: ${{ steps.vars.outputs.normalised }}
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run: |
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set -euo pipefail
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mkdir -p output
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pushd src
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./configure --with-ensurepip=install --enable-shared
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make -j"$(nproc)" 2>&1 | tee ../build_output.txt
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make install DESTDIR="$PWD/../staging-std"
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popd
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mkdir -p "$ARCHIVE_BASE"
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cp -a staging-std/usr/local/bin "$ARCHIVE_BASE/"
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cp -a staging-std/usr/local/include "$ARCHIVE_BASE/"
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cp -a staging-std/usr/local/lib "$ARCHIVE_BASE/"
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cp -a staging-std/usr/local/share "$ARCHIVE_BASE/"
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patchelf --set-rpath '$ORIGIN/../lib' "$ARCHIVE_BASE/bin/python${MINOR}"
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sed -e "s|{{__VERSION_FULL__}}|${NORMALISED}|g" \
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-e "s|{{__ARCH__}}|riscv64|g" \
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installers/nix-setup-template.sh > "$ARCHIVE_BASE/setup.sh"
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mv build_output.txt "$ARCHIVE_BASE/build_output.txt"
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(cd "$ARCHIVE_BASE" && find . \( -type f -o -type l \) | sed 's|^\.|/|') > "$ARCHIVE_BASE/tools_structure.txt"
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tar -czf "output/${ARCHIVE_BASE}.tar.gz" "$ARCHIVE_BASE"
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rm -rf "$ARCHIVE_BASE" staging-std
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- name: Build free-threaded CPython
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if: ${{ inputs.freethreaded == true }}
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env:
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MINOR: ${{ steps.vars.outputs.minor }}
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ARCHIVE_BASE: ${{ steps.vars.outputs.archive_base }}
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NORMALISED: ${{ steps.vars.outputs.normalised }}
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run: |
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set -euo pipefail
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ft_base="${ARCHIVE_BASE}-freethreaded"
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pushd src
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git clean -fdx
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./configure --with-ensurepip=install --enable-shared --disable-gil
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make -j"$(nproc)" 2>&1 | tee ../build_output.txt
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make install DESTDIR="$PWD/../staging-ft"
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popd
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mkdir -p "$ft_base"
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cp -a staging-ft/usr/local/bin "$ft_base/"
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cp -a staging-ft/usr/local/include "$ft_base/"
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cp -a staging-ft/usr/local/lib "$ft_base/"
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cp -a staging-ft/usr/local/share "$ft_base/"
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patchelf --set-rpath '$ORIGIN/../lib' "$ft_base/bin/python${MINOR}"
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sed -e "s|{{__VERSION_FULL__}}|${NORMALISED}|g" \
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-e "s|{{__ARCH__}}|riscv64|g" \
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installers/nix-setup-template.sh > "$ft_base/setup.sh"
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mv build_output.txt "$ft_base/build_output.txt"
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(cd "$ft_base" && find . \( -type f -o -type l \) | sed 's|^\.|/|') > "$ft_base/tools_structure.txt"
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tar -czf "output/${ft_base}.tar.gz" "$ft_base"
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rm -rf "$ft_base" staging-ft
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- name: Print tarball hashes
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run: sha256sum output/*.tar.gz
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- name: Publish release
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env:
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NORMALISED: ${{ steps.vars.outputs.normalised }}
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run: |
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set -euo pipefail
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if gh release view "$NORMALISED" --repo "$GITHUB_REPOSITORY" >/dev/null 2>&1; then
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gh release upload "$NORMALISED" --repo "$GITHUB_REPOSITORY" --clobber ./output/*.tar.gz
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else
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gh release create "$NORMALISED" --repo "$GITHUB_REPOSITORY" \
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--title "$NORMALISED" \
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--notes "Python $NORMALISED" \
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./output/*.tar.gz
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fi

‎.github/workflows/check-releases.yml‎

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name: Check CPython releases
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on:
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schedule:
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- cron: '0 6 * * *'
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workflow_dispatch:
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inputs:
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max_dispatches:
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description: "Maximum number of build dispatches (0 = dry run)"
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required: false
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default: "20"
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type: string
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permissions:
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contents: read
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actions: write
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jobs:
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discover:
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runs-on: ubuntu-latest
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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MAX_DISPATCHES: ${{ inputs.max_dispatches || '20' }}
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steps:
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- name: Enumerate and dispatch
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run: |
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set -euo pipefail
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max="${MAX_DISPATCHES}"
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dispatched=0
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dispatched_list=""
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# Fetch all v* tags from python/cpython, ordered by version, descending (newer first)
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mapfile -t refs < <(gh api --paginate repos/python/cpython/git/matching-refs/tags/v -q '.[].ref' | sort -V --reverse)
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for ref in "${refs[@]}"; do
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tag="${ref#refs/tags/}"
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# Filter: 3.10+, with optional a/b/rc suffix, no dev/post
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if [[ ! "$tag" =~ ^v(3\.(1[0-9]|[2-9][0-9]))\.([0-9]+)(a[0-9]+|b[0-9]+|rc[0-9]+)?$ ]]; then
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continue
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fi
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minor_int="${BASH_REMATCH[2]}"
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# Normalise
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normalised="${tag#v}"
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normalised="$(echo "$normalised" | sed -E 's/a([0-9]+)$/-alpha.\1/; s/b([0-9]+)$/-beta.\1/; s/rc([0-9]+)$/-rc.\1/')"
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echo "Tag $tag -> release $normalised"
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if gh release view "$normalised" --repo "$GITHUB_REPOSITORY" >/dev/null 2>&1; then
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echo " already released, skipping"
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continue
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fi
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if [ "$dispatched" -ge "$max" ]; then
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echo " would dispatch (cap reached)"
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continue
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fi
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ft="false"
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if [ "$minor_int" -ge 13 ]; then
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ft="true"
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fi
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echo " dispatching build-python.yml (freethreaded=$ft)"
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gh workflow run build-python.yml --repo "$GITHUB_REPOSITORY" \
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-f cpython_tag="$tag" \
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-f freethreaded="$ft"
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dispatched=$((dispatched + 1))
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dispatched_list="${dispatched_list}${tag} -> ${normalised} (ft=${ft})"$'\n'
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done
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echo ""
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echo "=== Dispatched $dispatched build(s) ==="
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printf '%s' "$dispatched_list"

‎README.md‎

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# python-versions (riscv64)
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Prebuilt CPython binaries for `linux/riscv64`, published as GitHub Releases.
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A scheduled workflow polls [`python/cpython`](https://github.com/python/cpython)
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for new version tags (stable plus `a`/`b`/`rc` prereleases from 3.10 onward) and
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dispatches a build on the GitHub-hosted `ubuntu-24.04-riscv` runner for every
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tag that does not yet have a release here.
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Tarball layout and naming follow
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[`actions/python-versions`](https://github.com/actions/python-versions) so
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downstream tooling (`actions/setup-python`, toolcache scripts) can consume
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them unchanged. Free-threaded (`--disable-gil`) variants are published as
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additional assets on the same release for CPython 3.13+.
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## Release / asset naming
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| CPython tag | Release tag | Asset |
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| ------------ | ---------------- | ------------------------------------------------------------------ |
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| `v3.12.13` | `3.12.13` | `python-3.12.13-linux-24.04-riscv64.tar.gz` |
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| `v3.13.3` | `3.13.3` | `python-3.13.3-linux-24.04-riscv64.tar.gz` (+ `-freethreaded`) |
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| `v3.15.0a7` | `3.15.0-alpha.7` | `python-3.15.0-alpha.7-linux-24.04-riscv64.tar.gz` (+ `-freethreaded`) |
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## Using a release
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```sh
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tar -xzf python-3.12.13-linux-24.04-riscv64.tar.gz
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./python-3.12.13-linux-24.04-riscv64/bin/python3.12 --version
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```
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Or, to install into the GitHub Actions toolcache layout (`setup-python` compatible):
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```sh
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cd python-3.12.13-linux-24.04-riscv64
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./setup.sh
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```
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## Manual dispatch
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- Build one tag: trigger the **Build Python** workflow with `cpython_tag=v3.12.13` (optionally `freethreaded=true` for 3.13+).
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- Backfill: trigger **Check CPython releases** with `max_dispatches` set to the number of tags you want to build (use `0` for a dry run).

‎installers/nix-setup-template.sh‎

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set -e
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PYTHON_FULL_VERSION="{{__VERSION_FULL__}}"
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ARCH="{{__ARCH__}}"
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MAJOR_VERSION=$(echo $PYTHON_FULL_VERSION | cut -d '.' -f 1)
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MINOR_VERSION=$(echo $PYTHON_FULL_VERSION | cut -d '.' -f 2)
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PYTHON_MAJOR=python$MAJOR_VERSION
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PYTHON_MAJOR_DOT_MINOR=python$MAJOR_VERSION.$MINOR_VERSION
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PYTHON_MAJORMINOR=python$MAJOR_VERSION$MINOR_VERSION
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if [ -z ${AGENT_TOOLSDIRECTORY+x} ]; then
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# No AGENT_TOOLSDIRECTORY on GitHub images
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TOOLCACHE_ROOT=$RUNNER_TOOL_CACHE
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else
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TOOLCACHE_ROOT=$AGENT_TOOLSDIRECTORY
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fi
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PYTHON_TOOLCACHE_PATH=$TOOLCACHE_ROOT/Python
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PYTHON_TOOLCACHE_VERSION_PATH=$PYTHON_TOOLCACHE_PATH/$PYTHON_FULL_VERSION
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PYTHON_TOOLCACHE_VERSION_ARCH_PATH=$PYTHON_TOOLCACHE_VERSION_PATH/$ARCH
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echo "Check if Python hostedtoolcache folder exist..."
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if [ ! -d $PYTHON_TOOLCACHE_PATH ]; then
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echo "Creating Python hostedtoolcache folder..."
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mkdir -p $PYTHON_TOOLCACHE_PATH
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elif [ -d $PYTHON_TOOLCACHE_VERSION_ARCH_PATH ]; then
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echo "Deleting Python $PYTHON_FULL_VERSION ($ARCH)"
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rm -rf $PYTHON_TOOLCACHE_VERSION_ARCH_PATH
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fi
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echo "Create Python $PYTHON_FULL_VERSION folder"
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mkdir -p $PYTHON_TOOLCACHE_VERSION_ARCH_PATH
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echo "Copy Python binaries to hostedtoolcache folder"
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cp -R ./* $PYTHON_TOOLCACHE_VERSION_ARCH_PATH
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rm $PYTHON_TOOLCACHE_VERSION_ARCH_PATH/setup.sh
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cd $PYTHON_TOOLCACHE_VERSION_ARCH_PATH
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echo "Create additional symlinks (Required for the UsePythonVersion Azure Pipelines task and the setup-python GitHub Action)"
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ln -s ./bin/$PYTHON_MAJOR_DOT_MINOR python
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cd bin/
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ln -s $PYTHON_MAJOR_DOT_MINOR $PYTHON_MAJORMINOR
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if [ ! -f python ]; then
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ln -s $PYTHON_MAJOR_DOT_MINOR python
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fi
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chmod +x ../python $PYTHON_MAJOR $PYTHON_MAJOR_DOT_MINOR $PYTHON_MAJORMINOR python
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echo "Upgrading pip..."
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export PIP_ROOT_USER_ACTION=ignore
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./python -m ensurepip
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./python -m pip install --upgrade --force-reinstall pip --disable-pip-version-check --no-warn-script-location
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echo "Create complete file"
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touch $PYTHON_TOOLCACHE_VERSION_PATH/$ARCH.complete

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