Add conda-solver option

.github/workflows/example-12.yml

@@ -0,0 +1,49 @@
+name: "Example 12: Configure conda solver"
+
+on:
+  pull_request:
+    branches:
+      - "*"
+  push:
+    branches:
+      - "develop"
+      - "main"
+      - "master"
+  schedule:
+    # Note that cronjobs run on master/main by default
+    - cron: "0 0 * * *"
+
+jobs:
+  example-12:
+    # prevent cronjobs from running on forks
+    if:
+      (github.event_name == 'schedule' && github.repository ==
+      'conda-incubator/setup-miniconda') || (github.event_name != 'schedule')
+    name: Ex12 (os=${{ matrix.os }} solver=${{ matrix.solver }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        solver: ["classic", "libmamba"]
+        os: ["ubuntu-latest", "windows-latest"]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        id: setup-miniconda
+        continue-on-error: true
+        with:
+          auto-update-conda: true
+          conda-solver: ${{ matrix.solver }}
+          python-version: "3.9"
+      - name: Conda info
+        shell: bash -el {0}
+        run: conda info
+      - name: Conda list
+        shell: pwsh
+        run: conda list
+      - name: Environment
+        shell: bash -el {0}
+        run: printenv | sort
+      - name: Create an environment
+        shell: bash -el {0}
+        run: conda create -n unused --dry-run zlib

action.yml

@@ -222,17 +222,24 @@ inputs:
     default: "true"
   mamba-version:
     description:
-      'Experimental. Use mamba (https://github.com/QuantStack/mamba) as a faster
-      drop-in replacement for conda installs. Disabled by default. To enable,
-      use "*" or a "x.y" version string.'
+      'Use mamba (https://github.com/QuantStack/mamba) as a faster drop-in
+      replacement for conda installs. Disabled by default. To enable, use "*" or
+      a "x.y" version string.'
     required: false
     default: ""
   use-mamba:
     description:
-      "Experimental. Use mamba as soon as available (either as provided by
+      "Use mamba as soon as available (either as provided by
       `mamba-in-installer` or installation by `mamba-version`)"
     required: false
     default: ""
+  conda-solver:
+    description:
+      "Which conda solver plugin to use. Only applies to the `conda` client, not
+      `mamba`. Starting with Miniconda 23.5.2 and Miniforge 23.3.1, you can
+      choose between `classic` and `libmamba`."
+    required: false
+    default: "libmamba"
   architecture:
     description:
       'Architecture of Miniconda that should be installed. Available options on

dist/setup/index.js

@@ -24955,7 +24955,6 @@ exports.updateMamba = {
     label: "update mamba",
     provides: (inputs, options) => __awaiter(void 0, void 0, void 0, function* () { return inputs.mambaVersion !== "" || options.mambaInInstaller; }),
     toolPackages: (inputs, options) => __awaiter(void 0, void 0, void 0, function* () {
-        core.warning(`Mamba support is still experimental and can result in differently solved environments!`);
         return {
             tools: inputs.mambaVersion !== ""
                 ? [utils.makeSpec("mamba", inputs.mambaVersion)]
@@ -26032,6 +26031,7 @@ function parseInputs() {
                 channels: core.getInput("channels"),
                 show_channel_urls: core.getInput("show-channel-urls"),
                 use_only_tar_bz2: core.getInput("use-only-tar-bz2"),
+                solver: core.getInput("conda-solver"),
                 // These are always set to avoid terminal issues
                 always_yes: "true",
                 changeps1: "false",

package.json

@@ -55,7 +55,7 @@
     "eslint": "^8.27.0",
     "eslint-config-prettier": "^8.5.0",
     "eslint-plugin-prettier": "^4.2.1",
-    "husky": "^8.0.2",
+    "husky": "^8.0.3",
     "lerna": "^6.0.3",
     "lint-staged": "^13.0.3",
     "lodash": ">=4.17.21",

src/base-tools/update-mamba.ts

@@ -14,9 +14,6 @@ export const updateMamba: types.IToolProvider = {
   provides: async (inputs, options) =>
     inputs.mambaVersion !== "" || options.mambaInInstaller,
   toolPackages: async (inputs, options) => {
-    core.warning(
-      `Mamba support is still experimental and can result in differently solved environments!`
-    );
     return {
       tools:
         inputs.mambaVersion !== ""

src/input.ts

@@ -109,6 +109,7 @@ export async function parseInputs(): Promise<types.IActionInputs> {
       channels: core.getInput("channels"),
       show_channel_urls: core.getInput("show-channel-urls"),
       use_only_tar_bz2: core.getInput("use-only-tar-bz2"),
+      solver: core.getInput("conda-solver"),
       // These are always set to avoid terminal issues
       always_yes: "true",
       changeps1: "false",

src/types.ts

@@ -65,6 +65,7 @@ export interface ICondaConfig {
   use_only_tar_bz2: string;
   always_yes: string;
   changeps1: string;
+  solver: string;
 }
 
 /**