Use fetch_rapids.cmake. (#1319)

This PR migrates RMM to use `fetch_rapids.cmake` like most RAPIDS repos. This makes it easier to define a single source if the upstream branch of rapids-cmake needs to change for testing, like in #1247.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Ray Douglass (https://github.com/raydouglass)
  - Robert Maynard (https://github.com/robertmaynard)

URL: #1319

CMakeLists.txt

@@ -14,11 +14,7 @@
 
 cmake_minimum_required(VERSION 3.26.4 FATAL_ERROR)
 
-if(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/RMM_RAPIDS.cmake)
-  file(DOWNLOAD https://raw.githubusercontent.com/rapidsai/rapids-cmake/branch-23.10/RAPIDS.cmake
-       ${CMAKE_CURRENT_BINARY_DIR}/RMM_RAPIDS.cmake)
-endif()
-include(${CMAKE_CURRENT_BINARY_DIR}/RMM_RAPIDS.cmake)
+include(fetch_rapids.cmake)
 
 include(rapids-cmake)
 include(rapids-cpm)

ci/release/update-version.sh

@@ -31,14 +31,15 @@ function sed_runner() {
 
 # cpp update
 sed_runner 's/'"  VERSION .*"'/'"  VERSION ${NEXT_FULL_TAG}"'/g' CMakeLists.txt
-sed_runner 's/'"branch-.*\/RAPIDS.cmake"'/'"branch-${NEXT_SHORT_TAG}\/RAPIDS.cmake"'/g' CMakeLists.txt
 
 # Python update
 sed_runner 's/'"rmm_version .*)"'/'"rmm_version ${NEXT_FULL_TAG})"'/g' python/CMakeLists.txt
-sed_runner 's/'"branch-.*\/RAPIDS.cmake"'/'"branch-${NEXT_SHORT_TAG}\/RAPIDS.cmake"'/g' python/CMakeLists.txt
 sed_runner "s/__version__ = .*/__version__ = \"${NEXT_FULL_TAG}\"/g" python/rmm/__init__.py
 sed_runner "s/^version = .*/version = \"${NEXT_FULL_TAG}\"/g" python/pyproject.toml
 
+# rapids-cmake version
+sed_runner 's/'"branch-.*\/RAPIDS.cmake"'/'"branch-${NEXT_SHORT_TAG}\/RAPIDS.cmake"'/g' fetch_rapids.cmake
+
 # cmake-format rapids-cmake definitions
 sed_runner 's/'"branch-.*\/cmake-format-rapids-cmake.json"'/'"branch-${NEXT_SHORT_TAG}\/cmake-format-rapids-cmake.json"'/g' ci/check_style.sh
 

fetch_rapids.cmake

@@ -0,0 +1,18 @@
+# =============================================================================
+# Copyright (c) 2023, NVIDIA CORPORATION.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+# in compliance with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License
+# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+# or implied. See the License for the specific language governing permissions and limitations under
+# the License.
+# =============================================================================
+if(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/RMM_RAPIDS.cmake)
+  file(DOWNLOAD https://raw.githubusercontent.com/rapidsai/rapids-cmake/branch-23.10/RAPIDS.cmake
+       ${CMAKE_CURRENT_BINARY_DIR}/RMM_RAPIDS.cmake)
+endif()
+include(${CMAKE_CURRENT_BINARY_DIR}/RMM_RAPIDS.cmake)

python/CMakeLists.txt

@@ -16,9 +16,7 @@ cmake_minimum_required(VERSION 3.26.4 FATAL_ERROR)
 
 set(rmm_version 23.10.00)
 
-file(DOWNLOAD https://raw.githubusercontent.com/rapidsai/rapids-cmake/branch-23.10/RAPIDS.cmake
-     ${CMAKE_BINARY_DIR}/RAPIDS.cmake)
-include(${CMAKE_BINARY_DIR}/RAPIDS.cmake)
+include(../fetch_rapids.cmake)
 
 project(
   rmm-python