From d40b6e818f164cc6305b01fc7d52d68af1242c23 Mon Sep 17 00:00:00 2001
From: Ludovic Henry <git@ludovic.dev>
Date: Mon, 7 Sep 2026 14:07:12 +0200
Subject: [PATCH 1/2] ncompress: add build-ncompress.yml for riscv64 wheels

---
 .github/workflows/build-ncompress.yml | 89 +++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 .github/workflows/build-ncompress.yml

diff --git a/.github/workflows/build-ncompress.yml b/.github/workflows/build-ncompress.yml
new file mode 100644
index 000000000..59d20877d
--- /dev/null
+++ b/.github/workflows/build-ncompress.yml
@@ -0,0 +1,89 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# Based on upstream's own wheel build:
+#   https://github.com/valgur/ncompress/blob/v1.0.2/.github/workflows/publish.yml
+name: Build ncompress wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'ncompress version/tag to build (git tag without leading v, e.g. 1.0.2)'
+        required: true
+        default: '1.0.2'
+  pull_request:
+    paths:
+      - '.github/workflows/build-ncompress.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '1.0.2' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  NCOMPRESS_VERSION: ${{ inputs.version || '1.0.2' }}
+  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 ncompress ${{ inputs.version || '1.0.2' }} ${{ matrix.python }}-${{ matrix.libc }}_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        # cp312 wheel is abi3, so only cp314t needs a separate build
+        python: ["cp312", "cp314t"]
+        libc: [manylinux, musllinux]
+
+    steps:
+      - name: Checkout ncompress v${{ env.NCOMPRESS_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: valgur/ncompress
+          ref: v${{ env.NCOMPRESS_VERSION }}
+          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: ${{ env.MUSLLINUX_RISCV64_IMAGE }}
+
+      - name: Check wheel contents
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          path = sys.argv[1]
+          names = zipfile.ZipFile(path).namelist()
+          exts = [n for n in names if n.endswith(".so")]
+          assert exts and all("ncompress_core" in n for n in exts), exts
+          licences = {n.split(".dist-info/licenses/", 1)[1] for n in names
+                      if ".dist-info/licenses/" in n and not n.endswith("/")}
+          assert licences == {"LICENSE"}, licences
+          EOF
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: ncompress-${{ env.NCOMPRESS_VERSION }}-${{ matrix.python }}-${{ matrix.libc }}_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish ncompress ${{ inputs.version || '1.0.2' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: ncompress-${{ inputs.version || '1.0.2' }}-*riscv64

From 2816cad02f952e65478e686cd02aba79c62325c5 Mon Sep 17 00:00:00 2001
From: Ludovic Henry <git@ludovic.dev>
Date: Mon, 7 Sep 2026 14:28:47 +0200
Subject: [PATCH 2/2] ncompress: patch cmake.minimum-version -> cmake.version,
 apply in CI

Fixes "ERROR: Use cmake.version instead of cmake.minimum-version with
scikit-build-core >= 0.8" - pyproject.toml's build-system.requires
floors scikit-build-core at >=0.4.3 with no upper bound, so an
isolated build always resolves the newest release, which removed the
old key outright at 0.8.0. Reproduces on any architecture.
---
 .github/workflows/build-ncompress.yml         | 13 ++++++
 ...use-cmake.version-instead-of-cmake.m.patch | 41 +++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 patches/ncompress/1.0.2/0001-pyproject.toml-use-cmake.version-instead-of-cmake.m.patch

diff --git a/.github/workflows/build-ncompress.yml b/.github/workflows/build-ncompress.yml
index 59d20877d..379e31249 100644
--- a/.github/workflows/build-ncompress.yml
+++ b/.github/workflows/build-ncompress.yml
@@ -15,6 +15,7 @@ on:
   pull_request:
     paths:
       - '.github/workflows/build-ncompress.yml'
+      - 'patches/ncompress/**'
 
 concurrency:
   group: ${{ github.workflow }}-${{ inputs.version || '1.0.2' }}-${{ github.head_ref || github.run_id }}
@@ -52,6 +53,18 @@ jobs:
           ref: v${{ env.NCOMPRESS_VERSION }}
           persist-credentials: false
 
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      # pyproject.toml's build-system.requires floors scikit-build-core at
+      # >=0.4.3 with no upper bound; 0.8+ removed cmake.minimum-version outright,
+      # so an isolated build always fails on any architecture.
+      - name: Patch ncompress source
+        run: git apply python-wheels/patches/ncompress/${{ env.NCOMPRESS_VERSION }}/00*.patch
+
       - uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
         env:
           CIBW_ARCHS: riscv64
diff --git a/patches/ncompress/1.0.2/0001-pyproject.toml-use-cmake.version-instead-of-cmake.m.patch b/patches/ncompress/1.0.2/0001-pyproject.toml-use-cmake.version-instead-of-cmake.m.patch
new file mode 100644
index 000000000..cbc0c28fc
--- /dev/null
+++ b/patches/ncompress/1.0.2/0001-pyproject.toml-use-cmake.version-instead-of-cmake.m.patch
@@ -0,0 +1,41 @@
+From 582eab15369516c8e0c6ddac0d1be404f2624fe1 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Mon, 7 Sep 2026 14:27:18 +0200
+Subject: [PATCH] pyproject.toml: use cmake.version instead of
+ cmake.minimum-version
+
+scikit-build-core removed the cmake.minimum-version config key
+outright at 0.8.0 in favour of cmake.version. pyproject.toml's
+build-system.requires only floors scikit-build-core at >=0.4.3 with
+no upper bound, so an isolated build always resolves the newest
+release and dies at "Getting requirements to build wheel" with:
+
+  ERROR: Use cmake.version instead of cmake.minimum-version with
+  scikit-build-core >= 0.8
+
+Reproduces on any architecture (confirmed on macOS/arm64): this is a
+packaging defect in the 1.0.2 release, not a riscv64 gap.
+scikit-build-core reads cmake.version the same way
+cmake.minimum-version was read.
+
+Upstream-Status: To upstream [not filed against valgur/ncompress from this automated port; a maintainer should report it upstream]
+---
+ pyproject.toml | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pyproject.toml b/pyproject.toml
+index e0b8b74..6c65046 100644
+--- a/pyproject.toml
++++ b/pyproject.toml
+@@ -41,7 +41,7 @@ build-backend = "scikit_build_core.build"
+ # after editing C++ files.
+ 
+ [tool.scikit-build]
+-cmake.minimum-version = "3.18"
++cmake.version = ">=3.18"
+ wheel.license-files = ["LICENSE"]
+ build-dir = "build/{wheel_tag}"
+ # Build stable ABI wheels for CPython 3.12+
+-- 
+2.50.1 (Apple Git-155)
+