Add a get-pants-version config option to specify the get-pants.sh --v…

…ersion to use. (#34)

When installing pants via actions/init-pants the latest version of the
scie-pants is used by default.

This broke for folks using linux aarch64 due to a problem with the
builds (see pantsbuild/scie-pants#430).

Add an input which allows you to specify a version to pass into
`get-pants.sh --version`, e.g. "0.12.0" calls it with `get-pants.sh
--version 0.12.0`. When no version is specified the flag is omitted and
the default of the latest version is used.

We've been using this with the following in our fork to pin our build
scie-pants version:

```yaml
- uses: Noryai/pants-actions/init-pants@main
  with:
    get-pants-version: 0.12.0
```

init-pants/README.md

@@ -56,6 +56,10 @@ and oauth token so that pants can use GHA as a fine-grained remote cache. You mu
 configure the other remote caching options in `pants.ci.toml` or similar as described in
 [remote caching](https://www.pantsbuild.org/2.20/docs/using-pants/remote-caching-and-execution/remote-caching#github-actions-cache).
 
+`get-pants-version`: This is used to override the version of scie-pants
+downloaded by `get-pants.sh`. The default is the latest version. To specify a
+version set this to a release, e.g. `0.12.0`.
+
 `gh-host`: This is used to add an enterprise GitHub host for API calls instead of `github.com`.
 
 `gha-cache-key`: This is used to create the GHA cache keys for pants' `lmdb_store`

init-pants/action.yaml

@@ -17,6 +17,11 @@ inputs:
     required: false
     # When we update get-pants.sh, we should update this commit.
     default: 6f136713a46e555946a22ffb3ed49c372eea58df
+  get-pants-version:
+    description: |
+      Pass this version into `get-pants.sh --version`
+    required: false
+    default: ''
   base-branch:
     description: |
       The fallback commit to restore the local process cache from, if no cache
@@ -94,14 +99,20 @@ runs:
     - name: Ensure the Pants launcher binary
       shell: bash
       run: |
+        VERSION="${{ inputs.get-pants-version }}"
+        if [ -n "${VERSION}" ]; then
+          VERSION_FLAG="--version ${VERSION}"
+        else
+          VERSION_FLAG=""
+        fi
         if ! command -v pants; then
           if [[ -f ./get-pants.sh ]]; then
-            ./get-pants.sh
+            ./get-pants.sh $VERSION_FLAG
           else
             curl --proto '=https' --tlsv1.2 -fsSLo ${{ runner.temp }}/get-pants.sh \
               https://raw.githubusercontent.com/pantsbuild/setup/${{ inputs.setup-commit }}/get-pants.sh
             chmod +x ${{ runner.temp }}/get-pants.sh
-            ${{ runner.temp }}/get-pants.sh
+            ${{ runner.temp }}/get-pants.sh $VERSION_FLAG
           fi
           # add 'pants' is on the PATH for subsequent actions.
           if [[ -f "$HOME/bin/pants" ]]; then