Add Spack-based CI

.github/workflows/Spack.yml

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+# This is a CI workflow for the NCEPLIBS-wrf_io project.
+#
+# This workflow builds wrf_io with Spack. It also has a one-off job that
+# validates the recipe by ensuring that every CMake option that should be set
+# in the Spack recipe is so set.
+#
+# Alex Richert, Nov 2023
+name: Spack
+on:
+  push:
+    branches:
+    - develop
+  pull_request:
+    branches:
+    - develop
+
+jobs:
+  Spack:
+    strategy:
+      matrix:
+        os: ["ubuntu-latest"]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+
+    - name: checkout-wrf-io
+      uses: actions/checkout@v4
+      with: 
+        path: wrf-io
+
+    - name: cache-spack
+      id: cache-spack
+      uses: actions/cache@v3
+      with:
+        path: ~/spack-build-cache
+        key: spack-build-cache-${{ matrix.os }}-1
+
+    - name: spack-build-and-test
+      run: |
+        sudo apt install openmpi-bin libopenmpi-dev
+        cd
+        git clone -c feature.manyFiles=true https://github.com/jcsda/spack
+        . spack/share/spack/setup-env.sh
+        spack env create wrf-io-env
+        spack env activate wrf-io-env
+        cp $GITHUB_WORKSPACE/wrf-io/spack/package.py $SPACK_ROOT/var/spack/repos/builtin/packages/ncio/package.py
+        spack develop --no-clone --path $GITHUB_WORKSPACE/wrf-io ncio@develop
+        spack add wrf-io@develop%gcc@11 ^netcdf-c ~blosc ~szip ~mpi ^hdf5~mpi
+        spack external find cmake gmake openmpi
+        spack config add "packages:openmpi:buildable:false"
+        for mirror in $(spack mirror list | awk '{print $1}'); do
+          spack mirror rm --scope defaults ${mirror}
+        done
+        spack mirror add spack-build-cache ~/spack-build-cache
+        spack concretize
+        # Run installation and run CTest suite
+        if [  "${{ steps.cache.outputs.cache-hit }}" == true ]; then deps=only; else deps=auto; fi
+        spack install --verbose --fail-fast --no-check-signature --use-buildcache package:never,dependencies:${deps} --test root
+        spack buildcache push --only dependencies --unsigned --allow-root ~/spack-build-cache wrf-io
+
+    - name: Upload test results
+      uses: actions/upload-artifact@v3
+      if: ${{ failure() }}
+      with:
+        name: spackci-ctest-output-${{ matrix.os }}-${{ matrix.openmp }}
+        path: ${{ github.workspace }}/wrf-io/spack-build-*/Testing/Temporary/LastTest.log
+
+  # This job validates the Spack recipe by making sure each cmake build option is represented
+  recipe-check:
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: checkout-wrf-io
+      uses: actions/checkout@v4
+      with: 
+        path: wrf-io
+
+    - name: recipe-check
+      run: |
+        echo "If this jobs fails, look at the most recently output CMake option below and make sure that option appears in spack/package.py"
+        for opt in $(grep -ioP '^option\(\K(?!(ENABLE_DOCS))[^ ]+' $GITHUB_WORKSPACE/wrf-io/CMakeLists.txt) ; do
+          echo "Checking for presence of '$opt' CMake option in package.py"
+          grep -cP "define.+\b${opt}\b" $GITHUB_WORKSPACE/wrf-io/spack/package.py
+        done

spack/README

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+This directory contains an authoritative, up-to-date Spack recipe for NCEPLIBS-wrf_io, which is found under Spack as "wrf-io".
+
+Before each release of NCEPLIBS-wrf_io, this file should be updated to accommodate changes in build options, etc., and .github/workflows/spack.yml should be updated to exercise all variants. Only the version entry should need to be updated after the release prior to incorporation into the Spack repository and the JCSDA Spack fork.

spack/package.py

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+# Copyright 2013-2023 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class WrfIo(CMakePackage):
+    """The WRFIO package is a lightweight WRF-IO API library for Unified
+    Post Processor (UPP). It reads wrf forecasts (WRF state plus
+    diagnostics).
+
+    This is part of the NCEPLIBS project."""
+
+    homepage = "https://noaa-emc.github.io/NCEPLIBS-wrf_io"
+    url = "https://github.com/NOAA-EMC/NCEPLIBS-wrf_io/archive/refs/tags/v1.2.0.tar.gz"
+    git = "https://github.com/NOAA-EMC/NCEPLIBS-wrf_io"
+
+    maintainers("AlexanderRichert-NOAA", "Hang-Lei-NOAA", "edwardhartnett")
+
+    version("develop", branch="develop")
+    version("1.2.0", sha256="000cf5294a2c68460085258186e1f36c86d3d0d9c433aa969a0f92736b745617")
+
+    variant("openmp", default=False, description="Enable multithreading with OpenMP")
+
+    depends_on("netcdf-c")
+    depends_on("netcdf-fortran")
+
+    def cmake_args(self):
+        args = [self.define_from_variant("OPENMP", "openmp")]
+        return args