Initialize pre-existing Gradle User Home

src/cache-base.ts

@@ -99,6 +99,12 @@ export class GradleStateCache {
         this.initializeGradleUserHome(this.gradleUserHome, initScriptsDir)
     }
 
+    cacheOutputExists(): boolean {
+        // Need to check for 'caches' directory to avoid incorrect detection on MacOS agents
+        const paths = this.getCachePath()
+        return paths.some(x => fs.existsSync(x))
+    }
+
     /**
      * Restores the cache entry, finding the closest match to the currently running job.
      */

src/caches.ts

@@ -17,6 +17,13 @@ export async function restore(gradleUserHome: string): Promise<void> {
 
     // Initialize the Gradle User Home even when caching is disabled.
     const gradleStateCache = new GradleStateCache(gradleUserHome)
+    if (gradleStateCache.cacheOutputExists()) {
+        core.info('Gradle User Home already exists: will not restore from cache.')
+        // We still add init-scripts for build-scan capture
+        gradleStateCache.init()
+        return
+    }
+
     gradleStateCache.init()
 
     if (isCacheDisabled()) {