Support mambaforge in setup-conda

.github/workflows/setup-conda.yml

@@ -7,6 +7,11 @@ on:
   pull_request:
     branches: [ main ]
 
+# Cancel previous runs that have not completed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   conda:
     strategy:
@@ -24,6 +29,9 @@ jobs:
         - os: windows-latest
           conda: anaconda
           anaconda-version: "2019.03"
+        - os: windows-latest
+          conda: mambaforge
+          anaconda-version: "latest"
 
       fail-fast: false
 
@@ -32,14 +40,22 @@ jobs:
 
     steps:
     - name: Check out repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Setup anaconda (defaults)
       if: matrix.conda == 'anaconda'
       uses: ./setup-conda
       with:
         # NB no "installer:" key → test that default is used
-        version: ${{ matrix.anaconda-version}}
+        installer: ${{ matrix.conda }}
+
+    - name: Setup mambaforge (latest)
+      id: install-mamba
+      if: matrix.conda == 'mambaforge'
+      uses: ./setup-conda
+      with:
+        installer: ${{ matrix.conda }}
+        version: latest
 
     - name: Setup miniconda (py39_4.10.3)
       if: matrix.conda == 'miniconda'
@@ -48,5 +64,6 @@ jobs:
         installer: ${{ matrix.conda }}
         version: py39_4.10.3
 
-    - name: Check conda version and location
-      run: conda info
+    - name: Check mamba version and location
+      if: matrix.conda == 'mambaforge'
+      run: ${{ steps.install-mamba.cmd }} info

setup-conda/action.yml

@@ -3,7 +3,7 @@ description: "Install Anaconda or Miniconda"
 
 inputs:
   installer:
-    description: "Installer to use"
+    description: "Installer to use: one of anaconda, mambaforge, or miniconda"
     required: true
     default: "anaconda"
   version:
@@ -13,8 +13,11 @@ inputs:
 
 outputs:
   cache-path:
-    description: "Path to the conda installer, e.g. for use with actions/cache."
+    description: "Path to the installer, e.g. for use with actions/cache."
     value: ${{ steps.install.outputs.cache-path }}
+  cmd:
+    description: "Executable name of the installed package manager: 'conda' or 'mamba'."
+    value: ${{ steps.install.outputs.cmd }}
 
 runs:
   using: composite
@@ -27,6 +30,6 @@ runs:
     run: ${GITHUB_ACTION_PATH}/script.sh
     shell: bash
 
-  - name: Confirm installed conda is on PATH
-    run: conda info
+  - name: Confirm installed package manager is on PATH
+    run: ${{ steps.install.outputs.cmd }} info
     shell: bash

setup-conda/script.sh

@@ -15,15 +15,22 @@ pushd "$GITHUB_ACTION_PATH" || exit
 # - a URL_FRAGMENT used in the download URL
 case $INSTALLER in
   anaconda)
-    INSTALLER_TYPE="Anaconda3"
-    URL_FRAGMENT="archive"
+    INSTALLER_TYPE="Anaconda3-${VERSION}"
+    BASE_URL="https://repo.anaconda.com/archive"
+    CMD="conda"
+    ;;
+  mambaforge)
+    INSTALLER_TYPE="Mambaforge"
+    BASE_URL="https://github.com/conda-forge/miniforge/releases/${VERSION}/download"
+    CMD="mamba"
     ;;
   miniconda)
-    INSTALLER_TYPE="Miniconda3"
-    URL_FRAGMENT="miniconda"
+    INSTALLER_TYPE="Miniconda3-${VERSION}"
+    BASE_URL="https://repo.anaconda.com/miniconda"
+    CMD="conda"
     ;;
   *)
-    echo "::error::'installer:' must be one of (anaconda, miniconda); got '$INSTALLER'"
+    echo "::error::'installer:' must be one of (anaconda, mambaforge, miniconda); got '$INSTALLER'"
     exit 1
 esac
 
@@ -51,7 +58,7 @@ esac
 OS=$(echo "$RUNNER_OS" | sed "s/macOS/MacOSX/")
 
 # URL for installer
-URL="https://repo.anaconda.com/$URL_FRAGMENT/${INSTALLER_TYPE}-${VERSION}-${OS}-x86_64.${EXT}"
+URL="${BASE_URL}/${INSTALLER_TYPE}-${OS}-x86_64.${EXT}"
 
 # curl --time-cond only works if the named file exists
 if [ -x "conda.$EXT" ]; then
@@ -61,7 +68,7 @@ fi
 
 # Download installer
 echo "Download from: $URL"
-curl --silent "$URL" --output "conda.$EXT" $TIME_CONDITION
+curl --location --silent "$URL" --output "conda.$EXT" $TIME_CONDITION
 
 # Run the installer
 # - Run in batch/silent mode ("-b" on *nix, "/S" on Windows), accept the licence
@@ -86,5 +93,8 @@ esac
 # Windows, because this is what GHA expects.
 echo "$GITHUB_ACTION_PATH/$INSTALLER_TYPE/$BINDIR" >> "$GITHUB_PATH"
 
+# Write an output value for subsequent steps
+echo "cmd=$CMD" >> $GITHUB_OUTPUT
+
 # Return to the last directory
 popd || exit