Add cache service v2 client

packages/cache/src/internal/cacheUtils.ts

@@ -6,13 +6,16 @@ import * as fs from 'fs'
 import * as path from 'path'
 import * as semver from 'semver'
 import * as util from 'util'
-import {v4 as uuidV4} from 'uuid'
+import { v4 as uuidV4 } from 'uuid'
+import * as crypto from 'crypto'
 import {
   CacheFilename,
   CompressionMethod,
   GnuTarPathOnWindows
 } from './constants'
 
+const versionSalt = '1.0'
+
 // From https://github.com/actions/toolkit/blob/main/packages/tool-cache/src/tool-cache.ts#L23
 export async function createTempDirectory(): Promise<string> {
   const IS_WINDOWS = process.platform === 'win32'
@@ -143,3 +146,28 @@ export function isGhes(): boolean {
 
   return !isGitHubHost && !isGheHost
 }
+
+export function getCacheVersion(
+  paths: string[],
+  compressionMethod?: CompressionMethod,
+  enableCrossOsArchive = false
+): string {
+  // don't pass changes upstream
+  const components = paths.slice()
+
+  // Add compression method to cache version to restore
+  // compressed cache as per compression method
+  if (compressionMethod) {
+    components.push(compressionMethod)
+  }
+
+  // Only check for windows platforms if enableCrossOsArchive is false
+  if (process.platform === 'win32' && !enableCrossOsArchive) {
+    components.push('windows-only')
+  }
+
+  // Add salt to cache version to support breaking changes in cache entry
+  components.push(versionSalt)
+
+  return crypto.createHash('sha256').update(components.join('|')).digest('hex')
+}