Set default cache input to false for self-hosted runners

src/cache-save.ts

@@ -3,6 +3,7 @@ import * as cache from '@actions/cache';
 import fs from 'fs';
 import {State} from './constants';
 import {getCacheDirectoryPath, getPackageManagerInfo} from './cache-utils';
+import {getCacheInput} from './utils';
 
 // Catch and log any unhandled exceptions.  These exceptions can leak out of the uploadChunk method in
 // @actions/toolkit when a failed upload closes the file descriptor causing any in-process reads to
@@ -28,10 +29,7 @@ export async function run() {
 }
 
 const cachePackages = async () => {
-  const cacheInput = core.getBooleanInput('cache');
-  if (!cacheInput) {
-    return;
-  }
+  if (!getCacheInput()) return;
 
   const packageManager = 'default';
 

src/installer.ts

@@ -6,7 +6,7 @@ import * as httpm from '@actions/http-client';
 import * as sys from './system';
 import fs from 'fs';
 import os from 'os';
-import {StableReleaseAlias} from './utils';
+import {isSelfHosted, StableReleaseAlias} from './utils';
 
 type InstallationType = 'dist' | 'manifest';
 
@@ -175,11 +175,7 @@ async function cacheWindowsDir(
   if (os.platform() !== 'win32') return false;
 
   // make sure the action runs in the hosted environment
-  if (
-    process.env['RUNNER_ENVIRONMENT'] !== 'github-hosted' &&
-    process.env['AGENT_ISSELFHOSTED'] === '1'
-  )
-    return false;
+  if (isSelfHosted()) return false;
 
   const defaultToolCacheRoot = process.env['RUNNER_TOOL_CACHE'];
   if (!defaultToolCacheRoot) return false;

src/main.ts

@@ -8,6 +8,7 @@ import {isCacheFeatureAvailable} from './cache-utils';
 import cp from 'child_process';
 import fs from 'fs';
 import os from 'os';
+import {getCacheInput} from './utils';
 
 export async function run() {
   try {
@@ -17,7 +18,7 @@ export async function run() {
     //
     const versionSpec = resolveVersionInput();
 
-    const cache = core.getBooleanInput('cache');
+    const cache = getCacheInput();
     core.info(`Setup go version spec ${versionSpec}`);
 
     let arch = core.getInput('architecture');

src/utils.ts

@@ -1,4 +1,17 @@
+import * as core from '@actions/core';
+
 export enum StableReleaseAlias {
   Stable = 'stable',
   OldStable = 'oldstable'
 }
+
+export const isSelfHosted = (): boolean =>
+  process.env['RUNNER_ENVIRONMENT'] !== 'github-hosted' &&
+  process.env['AGENT_ISSELFHOSTED'] === '1';
+
+export const getCacheInput = (): boolean => {
+  // for self-hosted environment turn off cache by default
+  if (isSelfHosted() && core.getInput('cache') === '') return false;
+
+  return core.getBooleanInput('cache');
+};