Upgrade to Pants 2.15 and to scie-pants. (#20)

Author: benjyw

.github/workflows/pants.yaml

@@ -24,14 +24,16 @@ jobs:
         python-version: [3.8]
     steps:
     - uses: actions/checkout@v3
-    - uses: pantsbuild/actions/init-pants@v2
+    - uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    - uses: pantsbuild/actions/init-pants@v4-scie-pants
       # This action bootstraps pants and manages 2-3 GHA caches.
       # See: github.com/pantsbuild/actions/tree/main/init-pants/
       with:
-        pants-python-version: ${{ matrix.python-version }}
-        # cache0 makes it easy to bust the cache if needed
+        # v0 makes it easy to bust the cache if needed
         # just increase the integer to start with a fresh cache
-        gha-cache-key: cache0-py${{ matrix.python-version }}
+        gha-cache-key: v0
         # The Python backend uses named_caches for Pip/PEX state,
         # so it is appropriate to invalidate on lockfile changes.
         named-caches-hash: ${{ hashFiles('python-default.lock') }}
@@ -53,12 +55,12 @@ jobs:
         echo "PATH=${PATH}:${HOME}/.thrift" >> $GITHUB_ENV
     - name: Bootstrap Pants
       run: |
-        ./pants --version
+        pants --version
     - name: Check BUILD files
-      run: ./pants tailor --check update-build-files --check
+      run: pants tailor --check update-build-files --check
     - name: Lint and test
       run: |
-        ./pants lint test ::
+        pants lint test ::
     - name: Upload Pants log
       uses: actions/upload-artifact@v3
       with:

3rdparty/python/default.lock

@@ -1,6 +1,6 @@
 // This lockfile was autogenerated by Pants. To regenerate, run:
 //
-//    ./pants generate-lockfiles --resolve=python-default
+//    pants generate-lockfiles --resolve=python-default
 //
 // --- BEGIN PANTS LOCKFILE METADATA: DO NOT EDIT OR REMOVE ---
 // {

README.md

@@ -2,6 +2,11 @@
 
 An example repository to demonstrate codegen support in Pants. 
 
+You run Pants goals using the `pants` launcher binary, which will bootstrap the
+version of Pants configured for this repo if necessary.
+
+See [here](https://www.pantsbuild.org/docs/installation) for how to install the `pants` binary.
+
 Refer to these docs for more information:
 
 * [Go Protobuf](https://www.pantsbuild.org/docs/protobuf-go)
@@ -10,13 +15,13 @@ Refer to these docs for more information:
 
 Some commands you can try out:
 
-* `./pants export-codegen ::` - see the generated files.
+* `pants export-codegen ::` - see the generated files.
     * This isn't necessary for Pants to use the generated files, but can be useful when
       debugging or to generate files for IDEs.
-* `./pants test ::` - run all tests
-* `./pants fmt ::` - format Protobuf with `buf`
-* `./pants lint ::` - lint Protobuf with `buf`
-* `./pants dependencies <path/to/file>` - see what depends on what
+* `pants test ::` - run all tests
+* `pants fmt ::` - format Protobuf with `buf`
+* `pants lint ::` - lint Protobuf with `buf`
+* `pants dependencies <path/to/file>` - see what depends on what
 
 Check out our other [example repositories](https://www.pantsbuild.org/docs/example-repos) to see 
 other features like packaging binaries.