From 42d68b0f18328fa4bc0b76d8afda9bf74b0aee3c Mon Sep 17 00:00:00 2001
From: Ludovic Henry <git@ludovic.dev>
Date: Fri, 4 Sep 2026 10:26:07 +0200
Subject: [PATCH] ckzg: add build-ckzg.yml for riscv64 wheels

Build-from-checkout of ethereum/c-kzg-4844 (submodules recursive pulls
in the vendored BLST, whose build.sh auto-falls back to the portable
C implementation on any arch outside x86_64/aarch64 via -D__BLST_NO_ASM__,
so riscv64 needs no extra configuration). Mirrors upstream's
python-release.yml CIBW_BEFORE_BUILD_LINUX (clang install + make -C src
blst) and attempts both manylinux and musllinux riscv64, since the
package has no runtime dependencies to block musl. Tests run the
upstream bindings/python/tests.py suite against the full KZG test
vector tree, which the checkout brings along (not part of the sdist).
---
 .github/workflows/build-ckzg.yml | 88 ++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 .github/workflows/build-ckzg.yml

diff --git a/.github/workflows/build-ckzg.yml b/.github/workflows/build-ckzg.yml
new file mode 100644
index 000000000..8c0a91b7b
--- /dev/null
+++ b/.github/workflows/build-ckzg.yml
@@ -0,0 +1,88 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# Based on upstream's own wheel build:
+#   https://github.com/ethereum/c-kzg-4844/blob/v2.1.8/.github/workflows/python-release.yml
+name: Build ckzg wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'ckzg version/tag to build (git tag without leading v, e.g. 2.1.8)'
+        required: true
+        default: '2.1.8'
+  pull_request:
+    paths:
+      - '.github/workflows/build-ckzg.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '2.1.8' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  CKZG_VERSION: ${{ inputs.version || '2.1.8' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+  MUSLLINUX_RISCV64_IMAGE: quay.io/pypa/musllinux_1_2_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build ckzg ${{ inputs.version || '2.1.8' }} ${{ matrix.python }}-${{ matrix.libc }}_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+        libc: [manylinux, musllinux]
+
+    steps:
+      - name: Checkout c-kzg-4844 v${{ env.CKZG_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: ethereum/c-kzg-4844
+          ref: v${{ env.CKZG_VERSION }}
+          submodules: recursive
+          persist-credentials: false
+
+      - uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        env:
+          CIBW_ARCHS: riscv64
+          CIBW_BUILD: ${{ matrix.python }}-${{ matrix.libc }}_riscv64
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          CIBW_MUSLLINUX_RISCV64_IMAGE: ${{ env.MUSLLINUX_RISCV64_IMAGE }}
+          CIBW_BEFORE_BUILD_LINUX: |
+            if command -v apk > /dev/null; then
+              apk add --update clang && make -C src blst
+            elif command -v yum > /dev/null; then
+              yum install -y clang && make -C src blst
+            fi
+          CIBW_TEST_REQUIRES: PyYAML
+          CIBW_TEST_ENVIRONMENT: PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          CIBW_TEST_COMMAND: >-
+            python -c "import ckzg; assert ckzg.__file__.endswith('.so'), ckzg.__file__" &&
+            cd {package}/bindings/python &&
+            python tests.py
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: ckzg-${{ env.CKZG_VERSION }}-${{ matrix.python }}-${{ matrix.libc }}_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish ckzg ${{ inputs.version || '2.1.8' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: ckzg-${{ inputs.version || '2.1.8' }}-*riscv64