Migrate to composite plugin (#6608)

Per [b/384990125](https://b.corp.google.com/issues/384990125),

This migrates all of our `buildSrc` logic into a composite plugin called
`plugins`.

This PR makes no attempt to organize the code; that is out-of-scope for
the PR.

This PR also fixes various references to `buildSrc` (including markdown
links), to avoid any breakage.

Author: daymxn

.github/workflows/build-src-check.yml renamed to .github/workflows/plugins-check.yml

@@ -1,16 +1,16 @@
-name: Check buildSrc
+name: Check plugins
 
 on:
   pull_request:
     paths:
-      - 'buildSrc/**'
+      - 'plugins/**'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
 jobs:
-  build-src-check:
+  plugins-check:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/[email protected]
@@ -20,13 +20,13 @@ jobs:
           java-version: 17
           distribution: temurin
           cache: gradle
-      - name: buildSrc Tests
+      - name: plugins tests
         env:
           FIREBASE_CI: 1
         run: |
-          ./gradlew -b buildSrc/build.gradle.kts -PenablePluginTests=true check
+          ./gradlew plugins:check
       - name: Publish Test Results
         uses: EnricoMi/publish-unit-test-result-action@82082dac68ad6a19d980f8ce817e108b9f496c2a
         with:
           files: "**/build/test-results/**/*.xml"
-          check_name: "buildSrc Test Results"
+          check_name: "plugins test results"

.github/workflows/release-note-changes.yml

@@ -9,59 +9,59 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/[email protected]
-      with:
-        fetch-depth: 0
+      - uses: actions/[email protected]
+        with:
+          fetch-depth: 0
 
-    - name: Create output file
-      run: touch changelog_comment.md
+      - name: Create output file
+        run: touch changelog_comment.md
 
-    - name: Get changed changelog files
-      id: changed-files
-      uses: tj-actions/[email protected]
-      with:
-        files_ignore: |
-          buildSrc/**
-        files: |
-          **/CHANGELOG.md
+      - name: Get changed changelog files
+        id: changed-files
+        uses: tj-actions/[email protected]
+        with:
+          files_ignore: |
+            plugins/**
+          files: |
+            **/CHANGELOG.md
 
-    - name: Set up JDK 17
-      uses: actions/[email protected]
-      with:
-        java-version: 17
-        distribution: temurin
-        cache: gradle
+      - name: Set up JDK 17
+        uses: actions/[email protected]
+        with:
+          java-version: 17
+          distribution: temurin
+          cache: gradle
 
-    - name: Set up Python 3.10
-      uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3
-      if: ${{ steps.changed-files.outputs.any_changed == 'true' }}
-      with:
-        python-version: '3.10'
+      - name: Set up Python 3.10
+        uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3
+        if: ${{ steps.changed-files.outputs.any_changed == 'true' }}
+        with:
+          python-version: '3.10'
 
-    - name: Set up fireci
-      id: install-fireci
-      if: ${{ steps.changed-files.outputs.any_changed == 'true' }}
-      run: pip3 install -e ci/fireci
+      - name: Set up fireci
+        id: install-fireci
+        if: ${{ steps.changed-files.outputs.any_changed == 'true' }}
+        run: pip3 install -e ci/fireci
 
-    - name: Generate comment
-      id: generate-comment
-      if: ${{ steps.install-fireci.outcome == 'success' }}
-      run: |
-        fireci changelog_comment -c "${{ steps.changed-files.outputs.all_changed_files }}" -o ./changelog_comment.md
+      - name: Generate comment
+        id: generate-comment
+        if: ${{ steps.install-fireci.outcome == 'success' }}
+        run: |
+          fireci changelog_comment -c "${{ steps.changed-files.outputs.all_changed_files }}" -o ./changelog_comment.md
 
-    - name: Add PR Comment
-      uses: mshick/[email protected]
-      continue-on-error: true
-      with:
-        status: ${{ steps.generate-comment.outcome }}
-        message-path: ./changelog_comment.md
-        message-skipped: |
-          ## Release note changes
-          No release note changes were detected. If you made changes that should be
-          present in the next release, ensure you've added an entry in the appropriate
-          `CHANGELOG.md` file(s).
-        message-failure: |
-          ## Release note changes
-          A `CHANGELOG.md` file seems to not match the expected format.
-          Please ensure your changelog files are following the format as
-          defined in [our documentation](#).
+      - name: Add PR Comment
+        uses: mshick/[email protected]
+        continue-on-error: true
+        with:
+          status: ${{ steps.generate-comment.outcome }}
+          message-path: ./changelog_comment.md
+          message-skipped: |
+            ## Release note changes
+            No release note changes were detected. If you made changes that should be
+            present in the next release, ensure you've added an entry in the appropriate
+            `CHANGELOG.md` file(s).
+          message-failure: |
+            ## Release note changes
+            A `CHANGELOG.md` file seems to not match the expected format.
+            Please ensure your changelog files are following the format as
+            defined in [our documentation](#).

buildSrc/build.gradle.kts

@@ -45,7 +45,7 @@ has_changelog_changes = hasChangesIn(["CHANGELOG"])
 # Ignore changes in these directories
 $exclude_directories = [
   '.github/',
-  'buildSrc/',
+  'plugins/',
   'ci/',
   'encoders/',
   'firebase-annotations/',

ci/danger/Dangerfile

@@ -23,7 +23,7 @@ subdirectory with its respective build file(s).
 
 ```bash
 firebase-android-sdk
-├── buildSrc
+├── plugins
 ├── appcheck
 │   └── firebase-appcheck
 │   └── firebase-appcheck-playintegrity
@@ -45,7 +45,7 @@ Note that the build file name for any given SDK is not `build.gradle` or `build.
 but rather mirrors the name of the sdk, e.g.
 `firebase-common/firebase-common.gradle` or `firebase-common/firebase-common.gradle.kts`.
 
-All of the core Gradle build logic lives in `buildSrc` and is used by all
+All of the core Gradle build logic lives in `plugins` and is used by all
 SDKs.
 
 SDKs can be grouped together for convenience by placing them in a directory of

contributor-docs/onboarding/new_sdk.md

@@ -83,7 +83,7 @@ firebase-android-sdk$ ./gradlew :firebase-perf:dev-app:devicecheck
 There are differences in terms of Firebase projects when running this command in different scenarios.
 
 1. **CI Run**: These tests are run under Firebase Test Lab of the unified Firebase project 
-(according to [this](https://github.com/firebase/firebase-android-sdk/blob/main/buildSrc/src/main/java/com/google/firebase/gradle/plugins/ci/device/FirebaseTestServer.java)) 
+(according to [this](https://github.com/firebase/firebase-android-sdk/blob/main/plugins/src/main/java/com/google/firebase/gradle/plugins/ci/device/FirebaseTestServer.java)) 
 but the performance events are sent to a different project with which apps are configured with 
 (see `copyRootGoogleServices` task). 
 

firebase-perf/dev-app/README.md

@@ -75,7 +75,7 @@ firebase-android-sdk$ ./gradlew :firebase-perf:e2e-app:devicecheck
 There are differences in terms of Firebase projects when running this command in different scenarios.
 
 1. **CI Run**: These tests are run under Firebase Test Lab of the unified Firebase project 
-(according to [this](https://github.com/firebase/firebase-android-sdk/blob/main/buildSrc/src/main/java/com/google/firebase/gradle/plugins/ci/device/FirebaseTestServer.java)) 
+(according to [this](https://github.com/firebase/firebase-android-sdk/blob/main/plugins/src/main/java/com/google/firebase/gradle/plugins/ci/device/FirebaseTestServer.java)) 
 but the performance events are sent to a different project with which apps are configured with 
 (see `copyRootGoogleServices` task) 
 and the Prow Configuration in tg/831643). 

firebase-perf/e2e-app/README.md

@@ -1,4 +1,4 @@
-## Build Source
+## Plugins
 
 > [!NOTE]
 > Eventually, this will be merged with our [contributor documentation](https://firebase.github.io/firebase-android-sdk/).