Use build-results file for root project dirs

Instead of using a separate mechanism and init script, reuse the information
captured in the build-results file.

src/cache-base.ts

@@ -9,7 +9,6 @@ import {ConfigurationCacheEntryExtractor, GradleHomeEntryExtractor} from './cach
 const RESTORED_CACHE_KEY_KEY = 'restored-cache-key'
 
 export const META_FILE_DIR = '.gradle-build-action'
-export const PROJECT_ROOTS_FILE = 'project-roots.txt'
 const INCLUDE_PATHS_PARAMETER = 'gradle-home-cache-includes'
 const EXCLUDE_PATHS_PARAMETER = 'gradle-home-cache-excludes'
 
@@ -170,12 +169,7 @@ export class GradleStateCache {
         const propertiesFile = path.resolve(gradleUserHome, 'gradle.properties')
         fs.appendFileSync(propertiesFile, 'org.gradle.daemon=false')
 
-        const initScriptFilenames = [
-            'build-result-capture.init.gradle',
-            'build-result-capture-service.plugin.groovy',
-            'project-root-capture.init.gradle',
-            'project-root-capture.plugin.groovy'
-        ]
+        const initScriptFilenames = ['build-result-capture.init.gradle', 'build-result-capture-service.plugin.groovy']
         for (const initScriptFilename of initScriptFilenames) {
             const initScriptContent = this.readResourceAsString(initScriptFilename)
             const initScriptPath = path.resolve(initScriptsDir, initScriptFilename)

src/cache-extract-entries.ts

@@ -3,7 +3,7 @@ import fs from 'fs'
 import * as core from '@actions/core'
 import * as glob from '@actions/glob'
 
-import {META_FILE_DIR, PROJECT_ROOTS_FILE} from './cache-base'
+import {META_FILE_DIR} from './cache-base'
 import {CacheEntryListener, CacheListener} from './cache-reporting'
 import {
     cacheDebug,
@@ -14,6 +14,7 @@ import {
     saveCache,
     tryDelete
 } from './cache-utils'
+import {loadBuildResults} from './job-summary'
 
 const SKIP_RESTORE_VAR = 'GRADLE_BUILD_ACTION_SKIP_RESTORE'
 
@@ -387,13 +388,8 @@ export class ConfigurationCacheEntryExtractor extends AbstractEntryExtractor {
      * set of project roots, to allow saving of configuration-cache entries for each.
      */
     private getProjectRoots(): string[] {
-        const projectList = path.resolve(process.env['RUNNER_TEMP']!, PROJECT_ROOTS_FILE)
-        if (!fs.existsSync(projectList)) {
-            core.info(`Missing project list file ${projectList}`)
-            return []
-        }
-        const projectRoots = fs.readFileSync(projectList, 'utf-8')
-        core.info(`Found project roots '${projectRoots}' in ${projectList}`)
-        return projectRoots.trim().split('\n')
+        const buildResults = loadBuildResults()
+        const projectRootDirs = buildResults.map(x => x.rootProjectDir)
+        return [...new Set(projectRootDirs)] // Remove duplicates
     }
 }

src/job-summary.ts

@@ -3,7 +3,7 @@ import fs from 'fs'
 import path from 'path'
 import {logCachingReport, CacheListener} from './cache-reporting'
 
-interface BuildResult {
+export interface BuildResult {
     get rootProjectName(): string
     get rootProjectDir(): string
     get requestedTasks(): string
@@ -28,7 +28,7 @@ export function writeJobSummary(cacheListener: CacheListener): void {
     core.summary.write()
 }
 
-function loadBuildResults(): BuildResult[] {
+export function loadBuildResults(): BuildResult[] {
     const buildResultsDir = path.resolve(process.env['RUNNER_TEMP']!, '.build-results')
     if (!fs.existsSync(buildResultsDir)) {
         return []

src/resources/project-root-capture.init.gradle

@@ -1,10 +0,0 @@
-import org.gradle.util.GradleVersion
-
-// Only run against root build. Do not run against included builds.
-def isTopLevelBuild = gradle.getParent() == null
-// Only record configuration-cache entries for Gradle 7+
-def isAtLeastGradle7 = GradleVersion.current() >= GradleVersion.version('7.0')
-
-if (isTopLevelBuild && isAtLeastGradle7) {   
-    apply from: 'project-root-capture.plugin.groovy'
-}

src/resources/project-root-capture.plugin.groovy

@@ -1,40 +0,0 @@
-
-/*
- * Capture the build root directory for each executed Gradle build.
- * This is used to save/restore configuration-cache files, so:
- * - The implementation only makes sense if it's config-cache compatible
- * - We only need to support Gradle 7+
- */
-
-import org.gradle.tooling.events.*
-
-settingsEvaluated { settings ->
-    def rootDir = settings.rootDir.absolutePath
-    def rootListLocation = new File(System.getenv("RUNNER_TEMP"), "project-roots.txt").absolutePath
-
-    def projectTracker = gradle.sharedServices.registerIfAbsent("gradle-build-action-projectRootTracker", ProjectTracker, { spec ->
-        spec.getParameters().getRootDir().set(rootDir);
-        spec.getParameters().getRootListLocation().set(rootListLocation);
-    })
-
-    gradle.services.get(BuildEventsListenerRegistry).onTaskCompletion(projectTracker)
-}
-
-abstract class ProjectTracker implements BuildService<ProjectTracker.Params>, OperationCompletionListener, AutoCloseable {
-    interface Params extends BuildServiceParameters {
-        Property<String> getRootDir();
-        Property<String> getRootListLocation();
-    }
-
-    public void onFinish(FinishEvent finishEvent) {}
-
-    @Override
-    public void close() {
-        def rootDir = getParameters().getRootDir().get()
-        def rootDirEntry = rootDir + '\n'
-        def rootListFile = new File(getParameters().getRootListLocation().get())
-        if (!rootListFile.exists() || !rootListFile.text.contains(rootDirEntry)) {
-            rootListFile << rootDirEntry
-        }
-    }
-}

test/test-init-scripts/src/test/groovy/com/gradle/gradlebuildaction/TestProjectRootCapture.groovy

@@ -1,77 +0,0 @@
-package com.gradle.gradlebuildaction
-
-import static org.junit.Assume.assumeTrue
-
-class TestProjectRootCapture extends BaseInitScriptTest {
-    def initScript = 'project-root-capture.init.gradle'
-
-    def "captures project root on #testGradleVersion"() {
-        assumeTrue testGradleVersion.compatibleWithCurrentJvm
-
-        when:
-        run(['help'], initScript, testGradleVersion.gradleVersion)
-
-        then:
-        assertCapturesProjectRoot()
-
-        where:
-        testGradleVersion << CONFIGURATION_CACHE_VERSIONS
-    }
-
-    def "captures project root on #testGradleVersion when build fails"() {
-        assumeTrue testGradleVersion.compatibleWithCurrentJvm
-
-        addFailingTaskToBuild()
-
-        when:
-        runAndFail(['expectFailure'], initScript, testGradleVersion.gradleVersion)
-
-        then:
-        assertCapturesProjectRoot()
-
-        where:
-        testGradleVersion << CONFIGURATION_CACHE_VERSIONS
-    }
-
-    def "captures project root on #testGradleVersion with --configuration-cache"() {
-        assumeTrue testGradleVersion.compatibleWithCurrentJvm
-
-        when:
-        run(['help', '--configuration-cache'], initScript, testGradleVersion.gradleVersion)
-
-        then:
-        assertCapturesProjectRoot()
-        assert projectRootList.delete()
-
-        when:
-        run(['help', '--configuration-cache'], initScript, testGradleVersion.gradleVersion)
-
-        then:
-        assertCapturesProjectRoot()
-
-        where:
-        testGradleVersion << CONFIGURATION_CACHE_VERSIONS
-    }
-
-    def "has no effect on #testVersion"() {
-        assumeTrue testVersion.compatibleWithCurrentJvm
-
-        when:
-        run(['help'], initScript, testVersion.gradleVersion)
-
-        then:
-        assert !projectRootList.exists()
-
-        where:
-        testVersion << (ALL_VERSIONS - CONFIGURATION_CACHE_VERSIONS)
-    }
-
-    private void assertCapturesProjectRoot() {
-        assert projectRootList.exists()
-        assert new File(projectRootList.text.trim()).canonicalPath == testProjectDir.canonicalPath
-    }
-
-    private File getProjectRootList() {
-        new File(testProjectDir, 'project-roots.txt')
-    }
-}