Default to using conda-forge

.github/workflows/resources/channels_condarc

@@ -0,0 +1 @@
+channels: [free]

.github/workflows/test.yml

@@ -26,6 +26,8 @@ jobs:
         with:
           environment-file: false
 
+      - run: micromamba info
+
       - name: install mamba
         uses: ./
 

.github/workflows/test_options.yml

@@ -26,11 +26,15 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      # Download only
       - name: install mamba
         uses: ./
         with:
           environment-file: false
           environment-name: nofile
+      - run: |
+          micromamba info | grep -qv nofile
+          micromamba info | grep -q conda-forge
 
       - name: install mamba
         uses: ./
@@ -104,6 +108,9 @@ jobs:
       fail-fast: false
       matrix:
         environment-file: [false, environment.yml]
+        condarc-file: ['', .github/workflows/resources/channels_condarc]
+        condarc-options: ['', 'channels: [pytorch]']
+        channels: ['', 'main']
     steps:
       - uses: actions/checkout@v3
 
@@ -113,22 +120,30 @@ jobs:
           environment-file: ${{ matrix.environment-file }}
           environment-name: test-channels
           extra-specs: |
-            xtensor
-          channels: conda-forge,blah
+            ${{ matrix.condarc-options && 'cpuonly' || 'zlib' }}
+          channels: ${{ matrix.channels }}
+          condarc-file: ${{ matrix.condarc-file }}
+          condarc-options: ${{ matrix.condarc-options }}
       - name: check channels are correct
         run: |
-          CHANNEL_OPT=$(micromamba config get channels)
-          echo $CHANNEL_OPT
-          if [[ "$CHANNEL_OPT" != *"conda-forge"* ]]; then
-            exit 1;
-          fi
-          if [[ "$CHANNEL_OPT" != *"blah"* ]]; then
-            exit 1;
-          fi
-          if [[ "${{ matrix.environment-file }}" != "false" ]]; then
-            if [[ "$CHANNEL_OPT" != *"defaults"* ]]; then
-              exit 1;
-            fi
+          micromamba info > /tmp/info
+          cat /tmp/info
+          set -x
+          if test "${{ matrix.environment-file }}${{ matrix.condarc-file }}${{ matrix.condarc-options }}${{ matrix.channels }}" = false; then
+            # extra-specs only
+            grep -q conda-forge /tmp/info
+            ! grep -qE 'defaults|free|main|pytorch' /tmp/info
+          elif test -n "${{ matrix.condarc-options }}"; then
+            grep -q pytorch /tmp/info
+            ! grep -qE 'conda-forge|defaults|free|main' /tmp/info
+          elif test -n "${{ matrix.channels }}"; then
+            grep -q main /tmp/info
+            ! grep -qE 'conda-forge|defaults|free|pytorch' /tmp/info
+          elif test -n "${{ matrix.condarc-file }}"; then
+            grep -q free /tmp/info
+            ! grep -qE 'conda-forge|defaults|main|pytorch' /tmp/info
+          else
+            ! grep -qE 'conda-forge|defaults|free|main|pytorch' /tmp/info
           fi
 
   test_environment_without_name:

README.md

@@ -15,7 +15,7 @@ They are preinstalled in the default GitHub Actions environments.
 
 ### `environment-file`
 
-Required. Path to the `environment.yml` or `.lock` file for the Conda environment OR `false`. If `false`, only *extra-specs* will be considered and you should provide *channels*. If both *environment-file* and *extra-specs* are empty, no environment will be created (only `micromamba` will be installed). See the [Conda documentation](https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html#creating-an-environment-from-an-environment-yml-file) for more information.
+Required. Path to the `environment.yml` or `.lock` file for the Conda environment OR `false`. If `false`, only *extra-specs* will be considered. If both *environment-file* and *extra-specs* are empty, no environment will be created (only `micromamba` will be installed). See the [Conda documentation](https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html#creating-an-environment-from-an-environment-yml-file) for more information.
 
 Default value: `environment.yml`
 
@@ -46,17 +46,15 @@ are available.
 
 ### `channels`
 
-Comma separated list of channels to use in order of priority (eg., `conda-forge,my-private-channel`)
+DEPRECATED, alias for `condarc-options: channels:`.
 
 ### `condarc-file`
 
 Path to a `.condarc` file to use. See the [Conda documentation](https://docs.conda.io/projects/conda/en/latest/user-guide/configuration/) for more information.
 
 ### `channel-priority`
 
-Channel priority to use. One of `"strict"`, `"flexible"`, and `"disabled"`. See https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-channels.html#strict-channel-priority for more information.
-
-Default value: `strict`
+DEPRECATED, alias for `condarc-options: channel_priority:`. Channel priority to use. One of `"strict"`, `"flexible"`, and `"disabled"`. See https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-channels.html#strict-channel-priority for more information.
 
 ### `cache-downloads`
 
@@ -88,14 +86,17 @@ Default value: `https://micro.mamba.pm/api/micromamba`
 
 ### `condarc-options`
 
-More options to append to `.condarc`. Must be a string of valid YAML:
+More options to prepend to `.condarc`. Must be a string of valid YAML:
 
 ```yaml
 condarc-options: |
   proxy_servers:
     http: ...
 ```
 
+Defaults to `channel_priority: strict`, and an additional `channels: conda-forge`
+if `environment-file` is `false` and no `channels` are given in `condarc-file` and `condarc-options`.
+
 ### `post-deinit`
 
 Attempt to undo any modifications done to `.bashrc` etc. in the post action of the workflow.

action.yml

@@ -9,7 +9,7 @@ inputs:
     description: >-
       Required.
       Path to the `environment.yml` or `.lock` file for the Conda environment OR `false`.
-      If `false`, only *extra-specs* will be considered and you should provide *channels*.
+      If `false`, only *extra-specs* will be considered.
       If both *environment-file* and *extra-specs* are empty,
       no environment will be created (only `micromamba` will be installed).
       See the [Conda documentation](https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html#creating-an-environment-from-an-environment-yml-file)
@@ -44,18 +44,17 @@ inputs:
       are available.
   channels:
     description: >-
-      Comma separated list of channels to use in order of priority (eg., `conda-forge,my-private-channel`)
+      DEPRECATED, alias for `condarc-options: channels:`.
   condarc-file:
     description: >-
       Path to a `.condarc` file to use. See the [Conda documentation](https://docs.conda.io/projects/conda/en/latest/user-guide/configuration/)
       for more information.
   channel-priority:
     description: >-
+      DEPRECATED, alias for `condarc-options: channel_priority:`.
       Channel priority to use. One of `"strict"`, `"flexible"`, and `"disabled"`.
       See https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-channels.html#strict-channel-priority
       for more information.
-    required: true
-    default: strict
 
   # Caching options
   cache-downloads:
@@ -102,13 +101,16 @@ inputs:
     default: https://micro.mamba.pm/api/micromamba
   condarc-options:
     description: |-
-      More options to append to `.condarc`. Must be a string of valid YAML:
+      More options to prepend to `.condarc`. Must be a string of valid YAML:
 
       ```yaml
       condarc-options: |
         proxy_servers:
           http: ...
       ```
+
+      Defaults to `channel_priority: strict`, and an additional `channels: conda-forge`
+      if `environment-file` is `false` and no `channels` are given in `condarc-file` and `condarc-options`.
   post-deinit:
     description: |-
       Attempt to undo any modifications done to `.bashrc` etc. in the post action of the workflow.