add spack-based CI build (NOAA-EMC#100)

* adding package file

* adding spack CI build

* trying to get spack build to work

* trying to get spack build to work

* trying to get spack build to work

* trying to fix spack workflow

* Update package.py

---------

Co-authored-by: Alex Richert <82525672+AlexanderRichert-NOAA@users.noreply.github.com>

.github/workflows/Spack.yml

@@ -0,0 +1,68 @@
+# This is a CI workflow for the NCEPLIBS-g2tmpl project.
+#
+# This workflow builds w3emc with Spack, including installing with the "--test
+# root" option to run the CTest suite. 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, Sep 2023
+name: Spack
+on:
+  push:
+    branches:
+    - develop
+  pull_request:
+    branches:
+    - develop
+
+jobs:
+  # This job builds with Spack using every combination of variants and runs the CTest suite each time
+  Spack:
+    strategy:
+      matrix:
+        os: ["ubuntu-latest"]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+
+    - name: checkout-g2tmpl
+      uses: actions/checkout@v4
+      with: 
+        path: g2tmpl
+
+    - name: spack-build-and-test
+      run: |
+        git clone -c feature.manyFiles=true https://github.com/jcsda/spack
+        . spack/share/spack/setup-env.sh
+        spack env create g2tmpl-env
+        spack env activate g2tmpl-env
+        cp $GITHUB_WORKSPACE/g2tmpl/spack/package.py $SPACK_ROOT/var/spack/repos/builtin/packages/g2tmpl/package.py
+        mv $GITHUB_WORKSPACE/g2tmpl $SPACK_ENV/g2tmpl
+        spack develop --no-clone g2tmpl@develop
+        spack add g2tmpl@develop%gcc@11 
+        spack external find cmake gmake
+        spack concretize
+        # Run installation and run CTest suite
+        spack install --verbose --fail-fast --test root
+        # Run 'spack load' to check for obvious errors in setup_run_environment
+        spack load g2tmpl
+
+  # This job validates the Spack recipe by making sure each cmake build option is represented
+  recipe-check:
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: checkout-g2tmpl
+      uses: actions/checkout@v4
+      with: 
+        path: g2tmpl
+
+    - 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))[^ ]+' $GITHUB_WORKSPACE/g2tmpl/CMakeLists.txt) ; do
+          echo "Checking for presence of '$opt' CMake option in package.py"
+          grep -cP "define.+\b${opt}\b" $GITHUB_WORKSPACE/g2tmpl/spack/package.py
+        done

spack/package.py

@@ -0,0 +1,33 @@
+# 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 G2tmpl(CMakePackage):
+    """Utilities for GRIB2 templates.
+
+    This is part of NOAA's NCEPLIBS project."""
+
+    homepage = "https://github.com/NOAA-EMC/NCEPLIBS-g2tmpl"
+    url = "https://github.com/NOAA-EMC/NCEPLIBS-g2tmpl/archive/refs/tags/v1.10.0.tar.gz"
+    git = "https://github.com/NOAA-EMC/NCEPLIBS-g2tmpl"
+
+    maintainers("edwardhartnett", "AlexanderRichert-NOAA", "Hang-Lei-NOAA")
+
+    version("develop", branch="develop")
+    version("1.10.2", sha256="4063361369f3691f75288c801fa9d1a2414908b7d6c07bbf69d4165802e2a7fc")
+    version("1.10.1", sha256="0be425e5128fabb89915a92261aa75c27a46a3e115e00c686fc311321e5d1e2a")
+    version("1.10.0", sha256="dcc0e40b8952f91d518c59df7af64e099131c17d85d910075bfa474c8822649d")
+
+    variant("shared", default=False, description="Build shared library")
+
+    def cmake_args(self):
+        args = [self.define_from_variant("BUILD_SHARED_LIBS", "shared")]
+        return args
+
+    def check(self):
+        with working_dir(self.builder.build_directory):
+            make("test")