From 9c474cf11c455457c3cf062f419cda2982daf733 Mon Sep 17 00:00:00 2001
From: Patrick Avery <patrick.avery@kitware.com>
Date: Tue, 10 Oct 2023 13:30:41 -0500
Subject: [PATCH] Try using libmamba solver for conda packaging

It is [officially supported by conda](https://www.anaconda.com/blog/conda-is-fast-now),
and it is significantly faster.

Before this commit, Windows packaging usually takes 1 hour and 15 minutes. Mac packaging
usually takes about 45 minutes. Linux usually takes about 35 minutes.

We'll see if there are any noticeable differences.

Signed-off-by: Patrick Avery <patrick.avery@kitware.com>
---
 .github/workflows/container_build.sh | 4 ++++
 .github/workflows/package.yml        | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/.github/workflows/container_build.sh b/.github/workflows/container_build.sh
index 9c2911edf..55bbf01b0 100755
--- a/.github/workflows/container_build.sh
+++ b/.github/workflows/container_build.sh
@@ -21,6 +21,10 @@ ${HOME}/miniconda3/bin/conda create --override-channels -c conda-forge -y -n hex
 ${HOME}/miniconda3/bin/activate hexrd
 ${HOME}/miniconda3/bin/conda activate hexrd
 
+# Install the libmamba solver (it is much faster)
+${HOME}/miniconda3/bin/conda install -n base -c conda-forge conda-libmamba-solver
+${HOME}/miniconda3/bin/conda config --set solver libmamba
+
 # Install conda build and create output directory
 ${HOME}/miniconda3/bin/conda install --override-channels -c conda-forge conda-build -y
 mkdir output
diff --git a/.github/workflows/package.yml b/.github/workflows/package.yml
index b959c9470..51694d85b 100644
--- a/.github/workflows/package.yml
+++ b/.github/workflows/package.yml
@@ -46,6 +46,9 @@ jobs:
     - name: Install build requirements
       run: |
           conda activate hexrd
+          # Change default solver to be libmamba, so that it runs much faster
+          conda install -n base -c conda-forge conda-libmamba-solver
+          conda config --set solver libmamba
           # FIXME: downgrade urllib3 until this issue is fixed:
           # https://github.com/Anaconda-Platform/anaconda-client/issues/654
           conda install --override-channels -c conda-forge anaconda-client conda-build conda 'urllib3<2.0.0'