From 4e81e9b89255775d4d36a28341f35dccadb69f90 Mon Sep 17 00:00:00 2001
From: Ray Speth <speth@mit.edu>
Date: Tue, 24 Jan 2023 16:40:00 -0500
Subject: [PATCH] WIP: [CI] Cache Conda environment

---
 .github/workflows/main.yml | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d33a0f16ab0..d66b4af9634 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -480,26 +480,33 @@ jobs:
       name: Checkout the repository
       with:
         submodules: recursive
-    - name: Cache conda packages
-      uses: actions/cache@v3
-      env:
-        # Increase this value to reset cache if .github/windows-2022-environment.yml has not changed
-        CACHE_NUMBER: 0
-      with:
-        path: ~/conda_pkgs_dir
-        key:
-          ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{
-          hashFiles('.github/windows-2022-environment.yml') }}
     - name: Set up conda
       uses: conda-incubator/setup-miniconda@v2
       with:
-        auto-update-conda: true
         python-version: ${{ matrix.python-version }}
         miniforge-variant: Mambaforge
-        miniforge-version: latest
-        environment-file: .github/windows-2022-environment.yml
         activate-environment: windows-2022-mamba
-        use-only-tar-bz2: true
+        use-mamba: true
+    - name: Get Date
+      id: get-date
+      run: echo "today=$(/bin/date -u '+%Y%m%d')" >> $GITHUB_OUTPUT
+      shell: bash
+    - name: Activate Cache for conda environment
+      uses: actions/cache@v3
+      env:
+        # Increase this value to reset cache if .github/windows-2022-environment.yml has not changed
+        CACHE_NUMBER: 0
+      with:
+        path: ${{ env.CONDA }}/envs
+      key:
+        conda-${{ runner.os }}--${{ runner.arch }}--${{
+        steps.get-date.outputs.today }}-${{
+        hashFiles('.github/windows-2022-environment.yml') }}-${{ env.CACHE_NUMBER }}
+      id: cache
+    - name: Update conda environment
+      run:
+        mamba env update -n windows-2022-mamba -f .github/windows-2022-environment.yml
+      if: steps.cache.outputs.cache-hit != 'true'
     - name: Build Cantera
       run: scons build system_eigen=y system_yamlcpp=y logging=debug
         msvc_toolset_version=${{ matrix.vs-toolset }} f90_interface=n debug=n --debug=time -j2