Add conda recipe and corresponding CI build job

.github/workflows/pr.yaml

@@ -15,6 +15,14 @@ jobs:
       - wheel-build
     secrets: inherit
     uses: rapidsai/shared-workflows/.github/workflows/[email protected]
+  conda-python-build:
+    secrets: inherit
+    uses: rapidsai/shared-workflows/.github/workflows/[email protected]
+    with:
+      build_type: pull-request
+      # Package is pure Python and only ever requires one build.
+      # This selects "ARCH=amd64 + the latest supported Python + CUDA".
+      matrix_filter: map(select(.ARCH == "amd64")) | max_by([(.PY_VER|split(".")|map(tonumber)), (.CUDA_VER|split(".")|map(tonumber))]) | [.]
   wheel-build:
     secrets: inherit
     uses: rapidsai/shared-workflows/.github/workflows/[email protected]

ci/build_python.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# Copyright (c) 2024, NVIDIA CORPORATION.
+
+set -euo pipefail
+
+rapids-configure-conda-channels
+
+source rapids-date-string
+
+rapids-print-env
+
+rapids-logger "Begin py build"
+
+rapids-conda-retry mambabuild conda/recipes/rapids_build_backend
+
+rapids-upload-conda-to-s3 python

conda/recipes/rapids-build-backend/meta.yaml

@@ -0,0 +1,66 @@
+# Copyright (c) 2024, NVIDIA CORPORATION.
+
+{% set pyproject_data = load_file_data("pyproject.toml") %}
+{% set version = pyproject_data.get('project', {}).get('version') %}
+{% set summary = pyproject_data.get('project', {}).get('description') %}
+
+package:
+  name: rapids-build-backend
+  version: {{ version }}
+
+source:
+  path: ../../..
+
+build:
+  number: 0
+  noarch: python
+  script: python -m pip install . -vv --no-deps
+
+test:
+  requires:
+    - pip
+    - python >=3.9
+    {% for r in pyproject_data.get("project", {}).get("optional-dependencies", {}).get("test", []) %}
+    - {{ r }}
+    {% endfor %}
+  source_files:
+    - tests/
+    # Need the source for running tests, for whatever that's worth in a conda
+    # environment.
+    - rapids_build_backend/
+
+requirements:
+  host:
+    - pip
+    - python >=3.9
+    - conda-verify
+    {% for r in pyproject_data.get("build-system", {}).get("requires", []) %}
+    - {{ r }}
+    {% endfor %}
+  run:
+    {% for r in pyproject_data.get("project", {}).get("dependencies", []) %}
+    - {{ r }}
+    {% endfor %}
+
+    # Automatically include all extras since we have no way to request optional
+    # subsets in conda.
+    {% for extra, extra_deps in pyproject_data.get("project", {}).get("optional-dependencies", {}).items() %}
+    {% if extra != "test" %}
+    {% for r in extra_deps %}
+    - {{ r }}
+    {% endfor %}
+    {% endif %}
+    {% endfor %}
+
+about:
+  home: https://rapids.ai/
+  license: Apache-2.0
+  license_file: LICENSE
+  summary: {{ summary }}
+  description: |
+    This package contains the PEP 517 build backend adapter used by all of
+    RAPIDS. It does not directly perform builds, but rather performs various
+    RAPIDS-specific metadata manipulations before calling down to another build
+    backend like setuptools to finish the job.
+  doc_url: https://docs.rapids.ai/
+  dev_url: https://github.com/rapidsai/rapids-build-backend

conda/recipes/rapids-build-backend/run_test.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+# Copyright (c) 2024, NVIDIA CORPORATION.
+
+# TODO: In a conda environment we should probably be testing without
+# isolation for any tests to be meaningfully conda-specific. If we
+# think that's worthwhile it will require adding an environment
+# variable to conftest.py that controls whether the default `env`
+# used for installation is a virtual environment or simply the
+# current Python environment.
+python -m pytest -v tests/