Better error reporting when file deletion fails

- Include file name in all logging
- Log inital attempts at debug to avoid noise
- Include output of 'jps -lm' when final attempt fails

src/cache-utils.ts

@@ -1,6 +1,8 @@
 import * as core from '@actions/core'
 import * as cache from '@actions/cache'
 import * as github from '@actions/github'
+import * as exec from '@actions/exec'
+
 import * as crypto from 'crypto'
 import * as path from 'path'
 import * as fs from 'fs'
@@ -195,8 +197,9 @@ export function handleCacheFailure(error: unknown, message: string): void {
  * Attempt to delete a file or directory, waiting to allow locks to be released
  */
 export async function tryDelete(file: string): Promise<void> {
+    const maxAttempts = 5
     const stat = fs.lstatSync(file)
-    for (let count = 0; count < 3; count++) {
+    for (let attempt = 1; attempt <= maxAttempts; attempt++) {
         try {
             if (stat.isDirectory()) {
                 fs.rmdirSync(file, {recursive: true})
@@ -205,10 +208,13 @@ export async function tryDelete(file: string): Promise<void> {
             }
             return
         } catch (error) {
-            if (count === 2) {
+            if (attempt === maxAttempts) {
+                core.warning(`Failed to delete ${file}, which will impact caching. 
+It is likely locked by another process. Output of 'jps -ml':
+${await getJavaProcesses()}`)
                 throw error
             } else {
-                core.warning(String(error))
+                cacheDebug(`Attempt to delete ${file} failed. Will try again.`)
                 await delay(1000)
             }
         }
@@ -218,3 +224,8 @@ export async function tryDelete(file: string): Promise<void> {
 async function delay(ms: number): Promise<void> {
     return new Promise(resolve => setTimeout(resolve, ms))
 }
+
+async function getJavaProcesses(): Promise<string> {
+    const jpsOutput = await exec.getExecOutput('jps', ['-lm'])
+    return jpsOutput.stdout
+}

src/setup-gradle.ts

@@ -13,7 +13,7 @@ const GRADLE_USER_HOME = 'GRADLE_USER_HOME'
 const CACHE_LISTENER = 'CACHE_LISTENER'
 const JOB_SUMMARY_ENABLED_PARAMETER = 'generate-job-summary'
 
-function generateJobSummary(): boolean {
+function shouldGenerateJobSummary(): boolean {
     return core.getBooleanInput(JOB_SUMMARY_ENABLED_PARAMETER)
 }
 
@@ -56,7 +56,7 @@ export async function complete(): Promise<void> {
     const gradleUserHome = core.getState(GRADLE_USER_HOME)
     await caches.save(gradleUserHome, cacheListener)
 
-    if (generateJobSummary()) {
+    if (shouldGenerateJobSummary()) {
         writeJobSummary(buildResults, cacheListener)
     }
 }