Detect cached folders from multiple directories (#735)

* Add project-dir

* Fix find lock file

* Remove package-dir input

* format & resolve conflicts

* Add unit tests

* build dist

* Apply change request fixes

* handle non-dir cache-dependency-path

* bump cache version

* run checks

* Handle globs in cacheDependencyPath

* refactor, introduce `cacheDependencyPathToProjectsDirectories`

it is necessary for the next PR related yarn optimization

* Changes requests

* Apply fixes

* review fixes

* add e2e

* Add unique

* review updates

* review updates second stage

* Review fixes 3

* imporve e2e tests

.github/workflows/e2e-cache.yml

@@ -134,3 +134,30 @@ jobs:
       - name: Verify node and yarn
         run: __tests__/verify-node.sh "${{ matrix.node-version }}"
         shell: bash
+
+  yarn-subprojects:
+    name: Test yarn subprojects
+    strategy:
+      matrix:
+        node-version: [12, 14, 16]
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: prepare sub-projects
+        run: __tests__/prepare-subprojects.sh
+
+      # expect
+      #  - no errors
+      #  - log
+      #    ##[debug]Cache Paths:
+      #    ##[debug]["sub2/.yarn/cache","sub3/.yarn/cache","../../../.cache/yarn/v6"]
+      - name: Setup Node
+        uses: ./
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'yarn'
+          cache-dependency-path: |
+            **/*.lock
+            yarn.lock

__tests__/authutil.test.ts

@@ -1,9 +1,10 @@
 import os from 'os';
-import * as fs from 'fs';
+import fs from 'fs';
 import * as path from 'path';
 import * as core from '@actions/core';
 import * as io from '@actions/io';
 import * as auth from '../src/authutil';
+import * as cacheUtils from '../src/cache-utils';
 
 let rcFile: string;
 

__tests__/cache-restore.test.ts

@@ -32,13 +32,13 @@ describe('cache-restore', () => {
 
   function findCacheFolder(command: string) {
     switch (command) {
-      case utils.supportedPackageManagers.npm.getCacheFolderCommand:
+      case 'npm config get cache':
         return npmCachePath;
-      case utils.supportedPackageManagers.pnpm.getCacheFolderCommand:
+      case 'pnpm store path --silent':
         return pnpmCachePath;
-      case utils.supportedPackageManagers.yarn1.getCacheFolderCommand:
+      case 'yarn cache dir':
         return yarn1CachePath;
-      case utils.supportedPackageManagers.yarn2.getCacheFolderCommand:
+      case 'yarn config get cacheFolder':
         return yarn2CachePath;
       default:
         return 'packge/not/found';
@@ -108,7 +108,7 @@ describe('cache-restore', () => {
     it.each([['npm7'], ['npm6'], ['pnpm6'], ['yarn1'], ['yarn2'], ['random']])(
       'Throw an error because %s is not supported',
       async packageManager => {
-        await expect(restoreCache(packageManager)).rejects.toThrow(
+        await expect(restoreCache(packageManager, '')).rejects.toThrow(
           `Caching for '${packageManager}' is not supported`
         );
       }
@@ -132,7 +132,7 @@ describe('cache-restore', () => {
           }
         });
 
-        await restoreCache(packageManager);
+        await restoreCache(packageManager, '');
         expect(hashFilesSpy).toHaveBeenCalled();
         expect(infoSpy).toHaveBeenCalledWith(
           `Cache restored from key: node-cache-${platform}-${packageManager}-${fileHash}`
@@ -163,7 +163,7 @@ describe('cache-restore', () => {
         });
 
         restoreCacheSpy.mockImplementationOnce(() => undefined);
-        await restoreCache(packageManager);
+        await restoreCache(packageManager, '');
         expect(hashFilesSpy).toHaveBeenCalled();
         expect(infoSpy).toHaveBeenCalledWith(
           `${packageManager} cache is not found`

__tests__/cache-save.test.ts

@@ -107,18 +107,20 @@ describe('run', () => {
   describe('Validate unchanged cache is not saved', () => {
     it('should not save cache for yarn1', async () => {
       inputs['cache'] = 'yarn';
-      getStateSpy.mockImplementation(() => yarnFileHash);
+      getStateSpy.mockImplementation(key =>
-      getCommandOutputSpy
+        key === State.CachePrimaryKey || key === State.CacheMatchedKey
-        .mockImplementationOnce(() => '1.2.3')
+          ? yarnFileHash
-        .mockImplementationOnce(() => `${commonPath}/yarn1`);
+          : key === State.CachePaths
+          ? '["/foo/bar"]'
+          : 'not expected'
+      );
 
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(2);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`yarn path is ${commonPath}/yarn1`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith('Consumed yarn version is 1.2.3');
       expect(infoSpy).toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${yarnFileHash}, not saving cache.`
       );
@@ -127,18 +129,20 @@ describe('run', () => {
 
     it('should not save cache for yarn2', async () => {
       inputs['cache'] = 'yarn';
-      getStateSpy.mockImplementation(() => yarnFileHash);
+      getStateSpy.mockImplementation(key =>
-      getCommandOutputSpy
+        key === State.CachePrimaryKey || key === State.CacheMatchedKey
-        .mockImplementationOnce(() => '2.2.3')
+          ? yarnFileHash
-        .mockImplementationOnce(() => `${commonPath}/yarn2`);
+          : key === State.CachePaths
+          ? '["/foo/bar"]'
+          : 'not expected'
+      );
 
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(2);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`yarn path is ${commonPath}/yarn2`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith('Consumed yarn version is 2.2.3');
       expect(infoSpy).toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${yarnFileHash}, not saving cache.`
       );
@@ -147,35 +151,40 @@ describe('run', () => {
 
     it('should not save cache for npm', async () => {
       inputs['cache'] = 'npm';
-      getStateSpy.mockImplementation(() => npmFileHash);
+      getStateSpy.mockImplementation(key =>
+        key === State.CachePrimaryKey || key === State.CacheMatchedKey
+          ? yarnFileHash
+          : key === State.CachePaths
+          ? '["/foo/bar"]'
+          : 'not expected'
+      );
       getCommandOutputSpy.mockImplementationOnce(() => `${commonPath}/npm`);
 
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(1);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`npm path is ${commonPath}/npm`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
-      expect(infoSpy).toHaveBeenCalledWith(
-        `Cache hit occurred on the primary key ${npmFileHash}, not saving cache.`
-      );
       expect(setFailedSpy).not.toHaveBeenCalled();
     });
 
     it('should not save cache for pnpm', async () => {
       inputs['cache'] = 'pnpm';
-      getStateSpy.mockImplementation(() => pnpmFileHash);
+      getStateSpy.mockImplementation(key =>
-      getCommandOutputSpy.mockImplementationOnce(() => `${commonPath}/pnpm`);
+        key === State.CachePrimaryKey || key === State.CacheMatchedKey
+          ? yarnFileHash
+          : key === State.CachePaths
+          ? '["/foo/bar"]'
+          : 'not expected'
+      );
 
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(1);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`pnpm path is ${commonPath}/pnpm`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
-      expect(infoSpy).toHaveBeenCalledWith(
-        `Cache hit occurred on the primary key ${pnpmFileHash}, not saving cache.`
-      );
       expect(setFailedSpy).not.toHaveBeenCalled();
     });
   });
@@ -183,24 +192,22 @@ describe('run', () => {
   describe('action saves the cache', () => {
     it('saves cache from yarn 1', async () => {
       inputs['cache'] = 'yarn';
-      getStateSpy.mockImplementation((name: string) => {
+      getStateSpy.mockImplementation((key: string) =>
-        if (name === State.CacheMatchedKey) {
+        key === State.CacheMatchedKey
-          return yarnFileHash;
+          ? yarnFileHash
-        } else {
+          : key === State.CachePrimaryKey
-          return npmFileHash;
+          ? npmFileHash
-        }
+          : key === State.CachePaths
-      });
+          ? '["/foo/bar"]'
-      getCommandOutputSpy
+          : 'not expected'
-        .mockImplementationOnce(() => '1.2.3')
+      );
-        .mockImplementationOnce(() => `${commonPath}/yarn1`);
 
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(2);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`yarn path is ${commonPath}/yarn1`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith('Consumed yarn version is 1.2.3');
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${yarnFileHash}, not saving cache.`
       );
@@ -213,24 +220,22 @@ describe('run', () => {
 
     it('saves cache from yarn 2', async () => {
       inputs['cache'] = 'yarn';
-      getStateSpy.mockImplementation((name: string) => {
+      getStateSpy.mockImplementation((key: string) =>
-        if (name === State.CacheMatchedKey) {
+        key === State.CacheMatchedKey
-          return yarnFileHash;
+          ? yarnFileHash
-        } else {
+          : key === State.CachePrimaryKey
-          return npmFileHash;
+          ? npmFileHash
-        }
+          : key === State.CachePaths
-      });
+          ? '["/foo/bar"]'
-      getCommandOutputSpy
+          : 'not expected'
-        .mockImplementationOnce(() => '2.2.3')
+      );
-        .mockImplementationOnce(() => `${commonPath}/yarn2`);
 
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(2);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`yarn path is ${commonPath}/yarn2`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith('Consumed yarn version is 2.2.3');
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${yarnFileHash}, not saving cache.`
       );
@@ -243,21 +248,22 @@ describe('run', () => {
 
     it('saves cache from npm', async () => {
       inputs['cache'] = 'npm';
-      getStateSpy.mockImplementation((name: string) => {
+      getStateSpy.mockImplementation((key: string) =>
-        if (name === State.CacheMatchedKey) {
+        key === State.CacheMatchedKey
-          return npmFileHash;
+          ? npmFileHash
-        } else {
+          : key === State.CachePrimaryKey
-          return yarnFileHash;
+          ? yarnFileHash
-        }
+          : key === State.CachePaths
-      });
+          ? '["/foo/bar"]'
-      getCommandOutputSpy.mockImplementationOnce(() => `${commonPath}/npm`);
+          : 'not expected'
+      );
 
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(1);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`npm path is ${commonPath}/npm`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${npmFileHash}, not saving cache.`
       );
@@ -270,21 +276,22 @@ describe('run', () => {
 
     it('saves cache from pnpm', async () => {
       inputs['cache'] = 'pnpm';
-      getStateSpy.mockImplementation((name: string) => {
+      getStateSpy.mockImplementation((key: string) =>
-        if (name === State.CacheMatchedKey) {
+        key === State.CacheMatchedKey
-          return pnpmFileHash;
+          ? pnpmFileHash
-        } else {
+          : key === State.CachePrimaryKey
-          return npmFileHash;
+          ? npmFileHash
-        }
+          : key === State.CachePaths
-      });
+          ? '["/foo/bar"]'
-      getCommandOutputSpy.mockImplementationOnce(() => `${commonPath}/pnpm`);
+          : 'not expected'
+      );
 
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(1);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`pnpm path is ${commonPath}/pnpm`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${pnpmFileHash}, not saving cache.`
       );
@@ -297,14 +304,15 @@ describe('run', () => {
 
     it('save with -1 cacheId , should not fail workflow', async () => {
       inputs['cache'] = 'npm';
-      getStateSpy.mockImplementation((name: string) => {
+      getStateSpy.mockImplementation((key: string) =>
-        if (name === State.CacheMatchedKey) {
+        key === State.CacheMatchedKey
-          return npmFileHash;
+          ? npmFileHash
-        } else {
+          : key === State.CachePrimaryKey
-          return yarnFileHash;
+          ? yarnFileHash
-        }
+          : key === State.CachePaths
-      });
+          ? '["/foo/bar"]'
-      getCommandOutputSpy.mockImplementationOnce(() => `${commonPath}/npm`);
+          : 'not expected'
+      );
       saveCacheSpy.mockImplementation(() => {
         return -1;
       });
@@ -312,9 +320,9 @@ describe('run', () => {
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(1);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`npm path is ${commonPath}/npm`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${npmFileHash}, not saving cache.`
       );
@@ -327,14 +335,15 @@ describe('run', () => {
 
     it('saves with error from toolkit, should fail workflow', async () => {
       inputs['cache'] = 'npm';
-      getStateSpy.mockImplementation((name: string) => {
+      getStateSpy.mockImplementation((key: string) =>
-        if (name === State.CacheMatchedKey) {
+        key === State.CacheMatchedKey
-          return npmFileHash;
+          ? npmFileHash
-        } else {
+          : key === State.CachePrimaryKey
-          return yarnFileHash;
+          ? yarnFileHash
-        }
+          : key === State.CachePaths
-      });
+          ? '["/foo/bar"]'
-      getCommandOutputSpy.mockImplementationOnce(() => `${commonPath}/npm`);
+          : 'not expected'
+      );
       saveCacheSpy.mockImplementation(() => {
         throw new cache.ValidationError('Validation failed');
       });
@@ -342,9 +351,9 @@ describe('run', () => {
       await run();
 
       expect(getInputSpy).toHaveBeenCalled();
-      expect(getStateSpy).toHaveBeenCalledTimes(2);
+      expect(getStateSpy).toHaveBeenCalledTimes(3);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(1);
+      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenCalledWith(`npm path is ${commonPath}/npm`);
+      expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${npmFileHash}, not saving cache.`
       );

__tests__/cache-utils.test.ts

@@ -2,7 +2,17 @@ import * as core from '@actions/core';
 import * as cache from '@actions/cache';
 import path from 'path';
 import * as utils from '../src/cache-utils';
-import {PackageManagerInfo, isCacheFeatureAvailable} from '../src/cache-utils';
+import {
+  PackageManagerInfo,
+  isCacheFeatureAvailable,
+  supportedPackageManagers,
+  getCommandOutput
+} from '../src/cache-utils';
+import fs from 'fs';
+import * as cacheUtils from '../src/cache-utils';
+import * as glob from '@actions/glob';
+import {Globber} from '@actions/glob';
+import {MockGlobber} from './mock/glob-mock';
 
 describe('cache-utils', () => {
   const versionYarn1 = '1.2.3';
@@ -30,7 +40,7 @@ describe('cache-utils', () => {
     it.each<[string, PackageManagerInfo | null]>([
       ['npm', utils.supportedPackageManagers.npm],
       ['pnpm', utils.supportedPackageManagers.pnpm],
-      ['yarn', utils.supportedPackageManagers.yarn1],
+      ['yarn', utils.supportedPackageManagers.yarn],
       ['yarn1', null],
       ['yarn2', null],
       ['npm7', null]
@@ -72,4 +82,261 @@ describe('cache-utils', () => {
     jest.resetAllMocks();
     jest.clearAllMocks();
   });
+
+  describe('getCacheDirectoriesPaths', () => {
+    let existsSpy: jest.SpyInstance;
+    let lstatSpy: jest.SpyInstance;
+    let globCreateSpy: jest.SpyInstance;
+
+    beforeEach(() => {
+      existsSpy = jest.spyOn(fs, 'existsSync');
+      existsSpy.mockImplementation(() => true);
+
+      lstatSpy = jest.spyOn(fs, 'lstatSync');
+      lstatSpy.mockImplementation(arg => ({
+        isDirectory: () => true
+      }));
+
+      globCreateSpy = jest.spyOn(glob, 'create');
+
+      globCreateSpy.mockImplementation(
+        (pattern: string): Promise<Globber> =>
+          MockGlobber.create(['/foo', '/bar'])
+      );
+    });
+
+    afterEach(() => {
+      existsSpy.mockRestore();
+      lstatSpy.mockRestore();
+      globCreateSpy.mockRestore();
+    });
+
+    it.each([
+      [supportedPackageManagers.npm, ''],
+      [supportedPackageManagers.npm, '/dir/file.lock'],
+      [supportedPackageManagers.npm, '/**/file.lock'],
+      [supportedPackageManagers.pnpm, ''],
+      [supportedPackageManagers.pnpm, '/dir/file.lock'],
+      [supportedPackageManagers.pnpm, '/**/file.lock']
+    ])(
+      'getCacheDirectoriesPaths should return one dir for non yarn',
+      async (packageManagerInfo, cacheDependency) => {
+        getCommandOutputSpy.mockImplementation(() => 'foo');
+
+        const dirs = await cacheUtils.getCacheDirectories(
+          packageManagerInfo,
+          cacheDependency
+        );
+        expect(dirs).toEqual(['foo']);
+        // to do not call for a version
+        // call once for get cache folder
+        expect(getCommandOutputSpy).toHaveBeenCalledTimes(1);
+      }
+    );
+
+    it('getCacheDirectoriesPaths should return one dir for yarn without cacheDependency', async () => {
+      getCommandOutputSpy.mockImplementation(() => 'foo');
+
+      const dirs = await cacheUtils.getCacheDirectories(
+        supportedPackageManagers.yarn,
+        ''
+      );
+      expect(dirs).toEqual(['foo']);
+    });
+
+    it.each([
+      [supportedPackageManagers.npm, ''],
+      [supportedPackageManagers.npm, '/dir/file.lock'],
+      [supportedPackageManagers.npm, '/**/file.lock'],
+      [supportedPackageManagers.pnpm, ''],
+      [supportedPackageManagers.pnpm, '/dir/file.lock'],
+      [supportedPackageManagers.pnpm, '/**/file.lock'],
+      [supportedPackageManagers.yarn, ''],
+      [supportedPackageManagers.yarn, '/dir/file.lock'],
+      [supportedPackageManagers.yarn, '/**/file.lock']
+    ])(
+      'getCacheDirectoriesPaths should throw for getCommandOutput returning empty',
+      async (packageManagerInfo, cacheDependency) => {
+        getCommandOutputSpy.mockImplementation((command: string) =>
+          // return empty string to indicate getCacheFolderPath failed
+          //        --version still works
+          command.includes('version') ? '1.' : ''
+        );
+
+        await expect(
+          cacheUtils.getCacheDirectories(packageManagerInfo, cacheDependency)
+        ).rejects.toThrow(); //'Could not get cache folder path for /dir');
+      }
+    );
+
+    it.each([
+      [supportedPackageManagers.yarn, '/dir/file.lock'],
+      [supportedPackageManagers.yarn, '/**/file.lock']
+    ])(
+      'getCacheDirectoriesPaths should nothrow in case of having not directories',
+      async (packageManagerInfo, cacheDependency) => {
+        lstatSpy.mockImplementation(arg => ({
+          isDirectory: () => false
+        }));
+
+        await cacheUtils.getCacheDirectories(
+          packageManagerInfo,
+          cacheDependency
+        );
+        expect(warningSpy).toHaveBeenCalledTimes(1);
+        expect(warningSpy).toHaveBeenCalledWith(
+          `No existing directories found containing cache-dependency-path="${cacheDependency}"`
+        );
+      }
+    );
+
+    it.each(['1.1.1', '2.2.2'])(
+      'getCacheDirectoriesPaths yarn v%s should return one dir without cacheDependency',
+      async version => {
+        getCommandOutputSpy.mockImplementationOnce(() => version);
+        getCommandOutputSpy.mockImplementationOnce(() => `foo${version}`);
+
+        const dirs = await cacheUtils.getCacheDirectories(
+          supportedPackageManagers.yarn,
+          ''
+        );
+        expect(dirs).toEqual([`foo${version}`]);
+      }
+    );
+
+    it.each(['1.1.1', '2.2.2'])(
+      'getCacheDirectoriesPaths yarn v%s should return 2 dirs with globbed cacheDependency',
+      async version => {
+        let dirNo = 1;
+        getCommandOutputSpy.mockImplementation((command: string) =>
+          command.includes('version') ? version : `file_${version}_${dirNo++}`
+        );
+        globCreateSpy.mockImplementation(
+          (pattern: string): Promise<Globber> =>
+            MockGlobber.create(['/tmp/dir1/file', '/tmp/dir2/file'])
+        );
+
+        const dirs = await cacheUtils.getCacheDirectories(
+          supportedPackageManagers.yarn,
+          '/tmp/**/file'
+        );
+        expect(dirs).toEqual([`file_${version}_1`, `file_${version}_2`]);
+      }
+    );
+
+    it.each(['1.1.1', '2.2.2'])(
+      'getCacheDirectoriesPaths yarn v%s should return 2 dirs  with globbed cacheDependency expanding to duplicates',
+      async version => {
+        let dirNo = 1;
+        getCommandOutputSpy.mockImplementation((command: string) =>
+          command.includes('version') ? version : `file_${version}_${dirNo++}`
+        );
+        globCreateSpy.mockImplementation(
+          (pattern: string): Promise<Globber> =>
+            MockGlobber.create([
+              '/tmp/dir1/file',
+              '/tmp/dir2/file',
+              '/tmp/dir1/file'
+            ])
+        );
+
+        const dirs = await cacheUtils.getCacheDirectories(
+          supportedPackageManagers.yarn,
+          '/tmp/**/file'
+        );
+        expect(dirs).toEqual([`file_${version}_1`, `file_${version}_2`]);
+      }
+    );
+
+    it.each(['1.1.1', '2.2.2'])(
+      'getCacheDirectoriesPaths yarn v%s should return 2 uniq dirs despite duplicate cache directories',
+      async version => {
+        let dirNo = 1;
+        getCommandOutputSpy.mockImplementation((command: string) =>
+          command.includes('version')
+            ? version
+            : `file_${version}_${dirNo++ % 2}`
+        );
+        globCreateSpy.mockImplementation(
+          (pattern: string): Promise<Globber> =>
+            MockGlobber.create([
+              '/tmp/dir1/file',
+              '/tmp/dir2/file',
+              '/tmp/dir3/file'
+            ])
+        );
+
+        const dirs = await cacheUtils.getCacheDirectories(
+          supportedPackageManagers.yarn,
+          '/tmp/**/file'
+        );
+        expect(dirs).toEqual([`file_${version}_1`, `file_${version}_0`]);
+        expect(getCommandOutputSpy).toHaveBeenCalledTimes(6);
+        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+          'yarn --version',
+          '/tmp/dir1'
+        );
+        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+          'yarn --version',
+          '/tmp/dir2'
+        );
+        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+          'yarn --version',
+          '/tmp/dir3'
+        );
+        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+          version.startsWith('1.')
+            ? 'yarn cache dir'
+            : 'yarn config get cacheFolder',
+          '/tmp/dir1'
+        );
+        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+          version.startsWith('1.')
+            ? 'yarn cache dir'
+            : 'yarn config get cacheFolder',
+          '/tmp/dir2'
+        );
+        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+          version.startsWith('1.')
+            ? 'yarn cache dir'
+            : 'yarn config get cacheFolder',
+          '/tmp/dir3'
+        );
+      }
+    );
+
+    it.each(['1.1.1', '2.2.2'])(
+      'getCacheDirectoriesPaths yarn v%s should return 4 dirs with multiple globs',
+      async version => {
+        // simulate wrong indents
+        const cacheDependencyPath = `/tmp/dir1/file
+          /tmp/dir2/file
+/tmp/**/file
+          `;
+        globCreateSpy.mockImplementation(
+          (pattern: string): Promise<Globber> =>
+            MockGlobber.create([
+              '/tmp/dir1/file',
+              '/tmp/dir2/file',
+              '/tmp/dir3/file',
+              '/tmp/dir4/file'
+            ])
+        );
+        let dirNo = 1;
+        getCommandOutputSpy.mockImplementation((command: string) =>
+          command.includes('version') ? version : `file_${version}_${dirNo++}`
+        );
+        const dirs = await cacheUtils.getCacheDirectories(
+          supportedPackageManagers.yarn,
+          cacheDependencyPath
+        );
+        expect(dirs).toEqual([
+          `file_${version}_1`,
+          `file_${version}_2`,
+          `file_${version}_3`,
+          `file_${version}_4`
+        ]);
+      }
+    );
+  });
 });

__tests__/mock/glob-mock.test.ts

@@ -0,0 +1,18 @@
+import {MockGlobber} from './glob-mock';
+
+describe('mocked globber tests', () => {
+  it('globber should return generator', async () => {
+    const globber = new MockGlobber(['aaa', 'bbb', 'ccc']);
+    const generator = globber.globGenerator();
+    const result: string[] = [];
+    for await (const itemPath of generator) {
+      result.push(itemPath);
+    }
+    expect(result).toEqual(['aaa', 'bbb', 'ccc']);
+  });
+  it('globber should return glob', async () => {
+    const globber = new MockGlobber(['aaa', 'bbb', 'ccc']);
+    const result: string[] = await globber.glob();
+    expect(result).toEqual(['aaa', 'bbb', 'ccc']);
+  });
+});

__tests__/mock/glob-mock.ts

@@ -0,0 +1,29 @@
+import {Globber} from '@actions/glob';
+
+export class MockGlobber implements Globber {
+  private readonly expected: string[];
+  constructor(expected: string[]) {
+    this.expected = expected;
+  }
+  getSearchPaths(): string[] {
+    return this.expected.slice();
+  }
+
+  async glob(): Promise<string[]> {
+    const result: string[] = [];
+    for await (const itemPath of this.globGenerator()) {
+      result.push(itemPath);
+    }
+    return result;
+  }
+
+  async *globGenerator(): AsyncGenerator<string, void> {
+    for (const e of this.expected) {
+      yield e;
+    }
+  }
+
+  static async create(expected: string[]): Promise<MockGlobber> {
+    return new MockGlobber(expected);
+  }
+}

__tests__/prepare-subprojects.sh

@@ -0,0 +1,48 @@
+#!/bin/sh -e
+export YARN_ENABLE_IMMUTABLE_INSTALLS=false
+rm package.json
+rm package-lock.json
+echo "create yarn2 project in the sub2"
+mkdir sub2
+cd sub2
+cat <<EOT >package.json
+{
+  "name": "subproject",
+  "dependencies": {
+    "random": "^3.0.6",
+    "uuid": "^9.0.0"
+  }
+}
+EOT
+yarn set version 2.4.3
+yarn install
+
+echo "create yarn3 project in the sub3"
+cd ..
+mkdir sub3
+cd sub3
+cat <<EOT >package.json
+{
+  "name": "subproject",
+  "dependencies": {
+    "random": "^3.0.6",
+    "uuid": "^9.0.0"
+  }
+}
+EOT
+yarn set version 3.5.1
+yarn install
+
+echo "create yarn1 project in the root"
+cd ..
+cat <<EOT >package.json
+{
+  "name": "subproject",
+  "dependencies": {
+    "random": "^3.0.6",
+    "uuid": "^9.0.0"
+  }
+}
+EOT
+yarn set version 1.22.19
+yarn install

dist/setup/index.js

@@ -71144,7 +71144,8 @@ const restoreCache = (packageManager, cacheDependencyPath) => __awaiter(void 0,
         throw new Error(`Caching for '${packageManager}' is not supported`);
     }
     const platform = process.env.RUNNER_OS;
-    const cachePath = yield cache_utils_1.getCacheDirectoryPath(packageManagerInfo, packageManager);
+    const cachePaths = yield cache_utils_1.getCacheDirectories(packageManagerInfo, cacheDependencyPath);
+    core.saveState(constants_1.State.CachePaths, cachePaths);
     const lockFilePath = cacheDependencyPath
         ? cacheDependencyPath
         : findLockFile(packageManagerInfo);
@@ -71155,7 +71156,7 @@ const restoreCache = (packageManager, cacheDependencyPath) => __awaiter(void 0,
     const primaryKey = `node-cache-${platform}-${packageManager}-${fileHash}`;
     core.debug(`primary key is ${primaryKey}`);
     core.saveState(constants_1.State.CachePrimaryKey, primaryKey);
-    const cacheKey = yield cache.restoreCache([cachePath], primaryKey);
+    const cacheKey = yield cache.restoreCache(cachePaths, primaryKey);
     core.setOutput('cache-hit', Boolean(cacheKey));
     if (!cacheKey) {
         core.info(`${packageManager} cache is not found`);
@@ -71212,31 +71213,47 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.isCacheFeatureAvailable = exports.isGhes = exports.getCacheDirectoryPath = exports.getPackageManagerInfo = exports.getCommandOutput = exports.supportedPackageManagers = void 0;
+exports.isCacheFeatureAvailable = exports.isGhes = exports.getCacheDirectories = exports.getPackageManagerInfo = exports.getCommandOutputNotEmpty = exports.getCommandOutput = exports.supportedPackageManagers = void 0;
 const core = __importStar(__nccwpck_require__(2186));
 const exec = __importStar(__nccwpck_require__(1514));
 const cache = __importStar(__nccwpck_require__(7799));
+const glob = __importStar(__nccwpck_require__(8090));
+const path_1 = __importDefault(__nccwpck_require__(1017));
+const fs_1 = __importDefault(__nccwpck_require__(7147));
+const util_1 = __nccwpck_require__(2629);
 exports.supportedPackageManagers = {
     npm: {
+        name: 'npm',
         lockFilePatterns: ['package-lock.json', 'npm-shrinkwrap.json', 'yarn.lock'],
-        getCacheFolderCommand: 'npm config get cache'
+        getCacheFolderPath: () => exports.getCommandOutputNotEmpty('npm config get cache', 'Could not get npm cache folder path')
     },
     pnpm: {
+        name: 'pnpm',
         lockFilePatterns: ['pnpm-lock.yaml'],
-        getCacheFolderCommand: 'pnpm store path --silent'
+        getCacheFolderPath: () => exports.getCommandOutputNotEmpty('pnpm store path --silent', 'Could not get pnpm cache folder path')
     },
-    yarn1: {
+    yarn: {
+        name: 'yarn',
         lockFilePatterns: ['yarn.lock'],
-        getCacheFolderCommand: 'yarn cache dir'
+        getCacheFolderPath: (projectDir) => __awaiter(void 0, void 0, void 0, function* () {
-    },
+            const yarnVersion = yield exports.getCommandOutputNotEmpty(`yarn --version`, 'Could not retrieve version of yarn', projectDir);
-    yarn2: {
+            core.debug(`Consumed yarn version is ${yarnVersion} (working dir: "${projectDir || ''}")`);
-        lockFilePatterns: ['yarn.lock'],
+            const stdOut = yarnVersion.startsWith('1.')
-        getCacheFolderCommand: 'yarn config get cacheFolder'
+                ? yield exports.getCommandOutput('yarn cache dir', projectDir)
+                : yield exports.getCommandOutput('yarn config get cacheFolder', projectDir);
+            if (!stdOut) {
+                throw new Error(`Could not get yarn cache folder path for ${projectDir}`);
+            }
+            return stdOut;
+        })
     }
 };
-const getCommandOutput = (toolCommand) => __awaiter(void 0, void 0, void 0, function* () {
+const getCommandOutput = (toolCommand, cwd) => __awaiter(void 0, void 0, void 0, function* () {
-    let { stdout, stderr, exitCode } = yield exec.getExecOutput(toolCommand, undefined, { ignoreReturnCode: true });
+    let { stdout, stderr, exitCode } = yield exec.getExecOutput(toolCommand, undefined, Object.assign({ ignoreReturnCode: true }, (cwd && { cwd })));
     if (exitCode) {
         stderr = !stderr.trim()
             ? `The '${toolCommand}' command failed with exit code: ${exitCode}`
@@ -71246,13 +71263,14 @@ const getCommandOutput = (toolCommand) => __awaiter(void 0, void 0, void 0, func
     return stdout.trim();
 });
 exports.getCommandOutput = getCommandOutput;
-const getPackageManagerVersion = (packageManager, command) => __awaiter(void 0, void 0, void 0, function* () {
+const getCommandOutputNotEmpty = (toolCommand, error, cwd) => __awaiter(void 0, void 0, void 0, function* () {
-    const stdOut = yield exports.getCommandOutput(`${packageManager} ${command}`);
+    const stdOut = exports.getCommandOutput(toolCommand, cwd);
     if (!stdOut) {
-        throw new Error(`Could not retrieve version of ${packageManager}`);
+        throw new Error(error);
     }
     return stdOut;
 });
+exports.getCommandOutputNotEmpty = getCommandOutputNotEmpty;
 const getPackageManagerInfo = (packageManager) => __awaiter(void 0, void 0, void 0, function* () {
     if (packageManager === 'npm') {
         return exports.supportedPackageManagers.npm;
@@ -71261,29 +71279,75 @@ const getPackageManagerInfo = (packageManager) => __awaiter(void 0, void 0, void
         return exports.supportedPackageManagers.pnpm;
     }
     else if (packageManager === 'yarn') {
-        const yarnVersion = yield getPackageManagerVersion('yarn', '--version');
+        return exports.supportedPackageManagers.yarn;
-        core.debug(`Consumed yarn version is ${yarnVersion}`);
-        if (yarnVersion.startsWith('1.')) {
-            return exports.supportedPackageManagers.yarn1;
-        }
-        else {
-            return exports.supportedPackageManagers.yarn2;
-        }
     }
     else {
         return null;
     }
 });
 exports.getPackageManagerInfo = getPackageManagerInfo;
-const getCacheDirectoryPath = (packageManagerInfo, packageManager) => __awaiter(void 0, void 0, void 0, function* () {
+/**
-    const stdOut = yield exports.getCommandOutput(packageManagerInfo.getCacheFolderCommand);
+ * Expands (converts) the string input `cache-dependency-path` to list of directories that
-    if (!stdOut) {
+ * may be project roots
-        throw new Error(`Could not get cache folder path for ${packageManager}`);
+ * @param cacheDependencyPath - either a single string or multiline string with possible glob patterns
+ *                              expected to be the result of `core.getInput('cache-dependency-path')`
+ * @return list of directories and possible
+ */
+const getProjectDirectoriesFromCacheDependencyPath = (cacheDependencyPath) => __awaiter(void 0, void 0, void 0, function* () {
+    const globber = yield glob.create(cacheDependencyPath);
+    const cacheDependenciesPaths = yield globber.glob();
+    const existingDirectories = cacheDependenciesPaths
+        .map(path_1.default.dirname)
+        .filter(util_1.unique())
+        .filter(directory => fs_1.default.lstatSync(directory).isDirectory());
+    if (!existingDirectories.length)
+        core.warning(`No existing directories found containing cache-dependency-path="${cacheDependencyPath}"`);
+    return existingDirectories;
+});
+/**
+ * Finds the cache directories configured for the repo if cache-dependency-path is not empty
+ * @param packageManagerInfo - an object having getCacheFolderPath method specific to given PM
+ * @param cacheDependencyPath - either a single string or multiline string with possible glob patterns
+ *                              expected to be the result of `core.getInput('cache-dependency-path')`
+ * @return list of files on which the cache depends
+ */
+const getCacheDirectoriesFromCacheDependencyPath = (packageManagerInfo, cacheDependencyPath) => __awaiter(void 0, void 0, void 0, function* () {
+    const projectDirectories = yield getProjectDirectoriesFromCacheDependencyPath(cacheDependencyPath);
+    const cacheFoldersPaths = yield Promise.all(projectDirectories.map((projectDirectory) => __awaiter(void 0, void 0, void 0, function* () {
+        const cacheFolderPath = packageManagerInfo.getCacheFolderPath(projectDirectory);
+        core.debug(`${packageManagerInfo.name}'s cache folder "${cacheFolderPath}" configured for the directory "${projectDirectory}"`);
+        return cacheFolderPath;
+    })));
+    // uniq in order to do not cache the same directories twice
+    return cacheFoldersPaths.filter(util_1.unique());
+});
+/**
+ * Finds the cache directories configured for the repo ignoring cache-dependency-path
+ * @param packageManagerInfo - an object having getCacheFolderPath method specific to given PM
+ * @return list of files on which the cache depends
+ */
+const getCacheDirectoriesForRootProject = (packageManagerInfo) => __awaiter(void 0, void 0, void 0, function* () {
+    const cacheFolderPath = yield packageManagerInfo.getCacheFolderPath();
+    core.debug(`${packageManagerInfo.name}'s cache folder "${cacheFolderPath}" configured for the root directory`);
+    return [cacheFolderPath];
+});
+/**
+ * A function to find the cache directories configured for the repo
+ * currently it handles only the case of PM=yarn && cacheDependencyPath is not empty
+ * @param packageManagerInfo - an object having getCacheFolderPath method specific to given PM
+ * @param cacheDependencyPath - either a single string or multiline string with possible glob patterns
+ *                              expected to be the result of `core.getInput('cache-dependency-path')`
+ * @return list of files on which the cache depends
+ */
+const getCacheDirectories = (packageManagerInfo, cacheDependencyPath) => __awaiter(void 0, void 0, void 0, function* () {
+    // For yarn, if cacheDependencyPath is set, ask information about cache folders in each project
+    // folder satisfied by cacheDependencyPath https://github.com/actions/setup-node/issues/488
+    if (packageManagerInfo.name === 'yarn' && cacheDependencyPath) {
+        return getCacheDirectoriesFromCacheDependencyPath(packageManagerInfo, cacheDependencyPath);
     }
-    core.debug(`${packageManager} path is ${stdOut}`);
+    return getCacheDirectoriesForRootProject(packageManagerInfo);
-    return stdOut.trim();
 });
-exports.getCacheDirectoryPath = getCacheDirectoryPath;
+exports.getCacheDirectories = getCacheDirectories;
 function isGhes() {
     const ghUrl = new URL(process.env['GITHUB_SERVER_URL'] || 'https://github.com');
     return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM';
@@ -71321,6 +71385,7 @@ var State;
 (function (State) {
     State["CachePrimaryKey"] = "CACHE_KEY";
     State["CacheMatchedKey"] = "CACHE_RESULT";
+    State["CachePaths"] = "CACHE_PATHS";
 })(State = exports.State || (exports.State = {}));
 var Outputs;
 (function (Outputs) {
@@ -72159,7 +72224,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.printEnvDetailsAndSetOutput = exports.parseNodeVersionFile = void 0;
+exports.unique = exports.printEnvDetailsAndSetOutput = exports.parseNodeVersionFile = void 0;
 const core = __importStar(__nccwpck_require__(2186));
 const exec = __importStar(__nccwpck_require__(1514));
 function parseNodeVersionFile(contents) {
@@ -72221,6 +72286,16 @@ function getToolVersion(tool, options) {
         }
     });
 }
+const unique = () => {
+    const encountered = new Set();
+    return (value) => {
+        if (encountered.has(value))
+            return false;
+        encountered.add(value);
+        return true;
+    };
+};
+exports.unique = unique;
 
 
 /***/ }),

src/cache-restore.ts

@@ -6,14 +6,14 @@ import fs from 'fs';
 
 import {State} from './constants';
 import {
-  getCacheDirectoryPath,
+  getCacheDirectories,
   getPackageManagerInfo,
   PackageManagerInfo
 } from './cache-utils';
 
 export const restoreCache = async (
   packageManager: string,
-  cacheDependencyPath?: string
+  cacheDependencyPath: string
 ) => {
   const packageManagerInfo = await getPackageManagerInfo(packageManager);
   if (!packageManagerInfo) {
@@ -21,10 +21,11 @@ export const restoreCache = async (
   }
   const platform = process.env.RUNNER_OS;
 
-  const cachePath = await getCacheDirectoryPath(
+  const cachePaths = await getCacheDirectories(
     packageManagerInfo,
-    packageManager
+    cacheDependencyPath
   );
+  core.saveState(State.CachePaths, cachePaths);
   const lockFilePath = cacheDependencyPath
     ? cacheDependencyPath
     : findLockFile(packageManagerInfo);
@@ -41,7 +42,7 @@ export const restoreCache = async (
 
   core.saveState(State.CachePrimaryKey, primaryKey);
 
-  const cacheKey = await cache.restoreCache([cachePath], primaryKey);
+  const cacheKey = await cache.restoreCache(cachePaths, primaryKey);
   core.setOutput('cache-hit', Boolean(cacheKey));
 
   if (!cacheKey) {
@@ -56,6 +57,7 @@ export const restoreCache = async (
 const findLockFile = (packageManager: PackageManagerInfo) => {
   const lockFiles = packageManager.lockFilePatterns;
   const workspace = process.env.GITHUB_WORKSPACE!;
+
   const rootContent = fs.readdirSync(workspace);
 
   const lockFile = lockFiles.find(item => rootContent.includes(item));

src/cache-save.ts

@@ -1,8 +1,7 @@
 import * as core from '@actions/core';
 import * as cache from '@actions/cache';
-import fs from 'fs';
 import {State} from './constants';
-import {getCacheDirectoryPath, getPackageManagerInfo} from './cache-utils';
+import {getPackageManagerInfo} from './cache-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
@@ -24,6 +23,7 @@ export async function run() {
 const cachePackages = async (packageManager: string) => {
   const state = core.getState(State.CacheMatchedKey);
   const primaryKey = core.getState(State.CachePrimaryKey);
+  const cachePaths = JSON.parse(core.getState(State.CachePaths) || '[]');
 
   const packageManagerInfo = await getPackageManagerInfo(packageManager);
   if (!packageManagerInfo) {
@@ -31,14 +31,12 @@ const cachePackages = async (packageManager: string) => {
     return;
   }
 
-  const cachePath = await getCacheDirectoryPath(
+  if (cachePaths.length === 0) {
-    packageManagerInfo,
+    // TODO: core.getInput has a bug - it can return undefined despite its definition (tests only?)
-    packageManager
+    //       export declare function getInput(name: string, options?: InputOptions): string;
-  );
+    const cacheDependencyPath = core.getInput('cache-dependency-path') || '';
-
-  if (!fs.existsSync(cachePath)) {
     throw new Error(
-      `Cache folder path is retrieved for ${packageManager} but doesn't exist on disk: ${cachePath}`
+      `Cache folder paths are not retrieved for ${packageManager} with cache-dependency-path = ${cacheDependencyPath}`
     );
   }
 
@@ -49,7 +47,7 @@ const cachePackages = async (packageManager: string) => {
     return;
   }
 
-  const cacheId = await cache.saveCache([cachePath], primaryKey);
+  const cacheId = await cache.saveCache(cachePaths, primaryKey);
   if (cacheId == -1) {
     return;
   }

src/cache-utils.ts

@@ -1,40 +1,79 @@
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
 import * as cache from '@actions/cache';
-
+import * as glob from '@actions/glob';
-type SupportedPackageManagers = {
+import path from 'path';
-  [prop: string]: PackageManagerInfo;
+import fs from 'fs';
-};
+import {unique} from './util';
 
 export interface PackageManagerInfo {
+  name: string;
   lockFilePatterns: Array<string>;
-  getCacheFolderCommand: string;
+  getCacheFolderPath: (projectDir?: string) => Promise<string>;
 }
 
+interface SupportedPackageManagers {
+  npm: PackageManagerInfo;
+  pnpm: PackageManagerInfo;
+  yarn: PackageManagerInfo;
+}
 export const supportedPackageManagers: SupportedPackageManagers = {
   npm: {
+    name: 'npm',
     lockFilePatterns: ['package-lock.json', 'npm-shrinkwrap.json', 'yarn.lock'],
-    getCacheFolderCommand: 'npm config get cache'
+    getCacheFolderPath: () =>
+      getCommandOutputNotEmpty(
+        'npm config get cache',
+        'Could not get npm cache folder path'
+      )
   },
   pnpm: {
+    name: 'pnpm',
     lockFilePatterns: ['pnpm-lock.yaml'],
-    getCacheFolderCommand: 'pnpm store path --silent'
+    getCacheFolderPath: () =>
-  },
+      getCommandOutputNotEmpty(
-  yarn1: {
+        'pnpm store path --silent',
-    lockFilePatterns: ['yarn.lock'],
+        'Could not get pnpm cache folder path'
-    getCacheFolderCommand: 'yarn cache dir'
+      )
   },
-  yarn2: {
+  yarn: {
+    name: 'yarn',
     lockFilePatterns: ['yarn.lock'],
-    getCacheFolderCommand: 'yarn config get cacheFolder'
+    getCacheFolderPath: async projectDir => {
+      const yarnVersion = await getCommandOutputNotEmpty(
+        `yarn --version`,
+        'Could not retrieve version of yarn',
+        projectDir
+      );
+
+      core.debug(
+        `Consumed yarn version is ${yarnVersion} (working dir: "${
+          projectDir || ''
+        }")`
+      );
+
+      const stdOut = yarnVersion.startsWith('1.')
+        ? await getCommandOutput('yarn cache dir', projectDir)
+        : await getCommandOutput('yarn config get cacheFolder', projectDir);
+
+      if (!stdOut) {
+        throw new Error(
+          `Could not get yarn cache folder path for ${projectDir}`
+        );
+      }
+      return stdOut;
+    }
   }
 };
 
-export const getCommandOutput = async (toolCommand: string) => {
+export const getCommandOutput = async (
+  toolCommand: string,
+  cwd?: string
+): Promise<string> => {
   let {stdout, stderr, exitCode} = await exec.getExecOutput(
     toolCommand,
     undefined,
-    {ignoreReturnCode: true}
+    {ignoreReturnCode: true, ...(cwd && {cwd})}
   );
 
   if (exitCode) {
@@ -47,16 +86,15 @@ export const getCommandOutput = async (toolCommand: string) => {
   return stdout.trim();
 };
 
-const getPackageManagerVersion = async (
+export const getCommandOutputNotEmpty = async (
-  packageManager: string,
+  toolCommand: string,
-  command: string
+  error: string,
-) => {
+  cwd?: string
-  const stdOut = await getCommandOutput(`${packageManager} ${command}`);
+): Promise<string> => {
-
+  const stdOut = getCommandOutput(toolCommand, cwd);
   if (!stdOut) {
-    throw new Error(`Could not retrieve version of ${packageManager}`);
+    throw new Error(error);
   }
-
   return stdOut;
 };
 
@@ -66,35 +104,102 @@ export const getPackageManagerInfo = async (packageManager: string) => {
   } else if (packageManager === 'pnpm') {
     return supportedPackageManagers.pnpm;
   } else if (packageManager === 'yarn') {
-    const yarnVersion = await getPackageManagerVersion('yarn', '--version');
+    return supportedPackageManagers.yarn;
-
-    core.debug(`Consumed yarn version is ${yarnVersion}`);
-
-    if (yarnVersion.startsWith('1.')) {
-      return supportedPackageManagers.yarn1;
-    } else {
-      return supportedPackageManagers.yarn2;
-    }
   } else {
     return null;
   }
 };
 
-export const getCacheDirectoryPath = async (
+/**
-  packageManagerInfo: PackageManagerInfo,
+ * Expands (converts) the string input `cache-dependency-path` to list of directories that
-  packageManager: string
+ * may be project roots
-) => {
+ * @param cacheDependencyPath - either a single string or multiline string with possible glob patterns
-  const stdOut = await getCommandOutput(
+ *                              expected to be the result of `core.getInput('cache-dependency-path')`
-    packageManagerInfo.getCacheFolderCommand
+ * @return list of directories and possible
+ */
+const getProjectDirectoriesFromCacheDependencyPath = async (
+  cacheDependencyPath: string
+): Promise<string[]> => {
+  const globber = await glob.create(cacheDependencyPath);
+  const cacheDependenciesPaths = await globber.glob();
+
+  const existingDirectories: string[] = cacheDependenciesPaths
+    .map(path.dirname)
+    .filter(unique())
+    .filter(directory => fs.lstatSync(directory).isDirectory());
+
+  if (!existingDirectories.length)
+    core.warning(
+      `No existing directories found containing cache-dependency-path="${cacheDependencyPath}"`
     );
 
-  if (!stdOut) {
+  return existingDirectories;
-    throw new Error(`Could not get cache folder path for ${packageManager}`);
+};
-  }
+
+/**
+ * Finds the cache directories configured for the repo if cache-dependency-path is not empty
+ * @param packageManagerInfo - an object having getCacheFolderPath method specific to given PM
+ * @param cacheDependencyPath - either a single string or multiline string with possible glob patterns
+ *                              expected to be the result of `core.getInput('cache-dependency-path')`
+ * @return list of files on which the cache depends
+ */
+const getCacheDirectoriesFromCacheDependencyPath = async (
+  packageManagerInfo: PackageManagerInfo,
+  cacheDependencyPath: string
+): Promise<string[]> => {
+  const projectDirectories = await getProjectDirectoriesFromCacheDependencyPath(
+    cacheDependencyPath
+  );
+  const cacheFoldersPaths = await Promise.all(
+    projectDirectories.map(async projectDirectory => {
+      const cacheFolderPath =
+        packageManagerInfo.getCacheFolderPath(projectDirectory);
+      core.debug(
+        `${packageManagerInfo.name}'s cache folder "${cacheFolderPath}" configured for the directory "${projectDirectory}"`
+      );
+      return cacheFolderPath;
+    })
+  );
+  // uniq in order to do not cache the same directories twice
+  return cacheFoldersPaths.filter(unique());
+};
 
-  core.debug(`${packageManager} path is ${stdOut}`);
+/**
+ * Finds the cache directories configured for the repo ignoring cache-dependency-path
+ * @param packageManagerInfo - an object having getCacheFolderPath method specific to given PM
+ * @return list of files on which the cache depends
+ */
+const getCacheDirectoriesForRootProject = async (
+  packageManagerInfo: PackageManagerInfo
+): Promise<string[]> => {
+  const cacheFolderPath = await packageManagerInfo.getCacheFolderPath();
+  core.debug(
+    `${packageManagerInfo.name}'s cache folder "${cacheFolderPath}" configured for the root directory`
+  );
+  return [cacheFolderPath];
+};
 
-  return stdOut.trim();
+/**
+ * A function to find the cache directories configured for the repo
+ * currently it handles only the case of PM=yarn && cacheDependencyPath is not empty
+ * @param packageManagerInfo - an object having getCacheFolderPath method specific to given PM
+ * @param cacheDependencyPath - either a single string or multiline string with possible glob patterns
+ *                              expected to be the result of `core.getInput('cache-dependency-path')`
+ * @return list of files on which the cache depends
+ */
+export const getCacheDirectories = async (
+  packageManagerInfo: PackageManagerInfo,
+  cacheDependencyPath: string
+): Promise<string[]> => {
+  // For yarn, if cacheDependencyPath is set, ask information about cache folders in each project
+  // folder satisfied by cacheDependencyPath https://github.com/actions/setup-node/issues/488
+  if (packageManagerInfo.name === 'yarn' && cacheDependencyPath) {
+    return getCacheDirectoriesFromCacheDependencyPath(
+      packageManagerInfo,
+      cacheDependencyPath
+    );
+  }
+  return getCacheDirectoriesForRootProject(packageManagerInfo);
 };
 
 export function isGhes(): boolean {

src/constants.ts

@@ -6,7 +6,8 @@ export enum LockType {
 
 export enum State {
   CachePrimaryKey = 'CACHE_KEY',
-  CacheMatchedKey = 'CACHE_RESULT'
+  CacheMatchedKey = 'CACHE_RESULT',
+  CachePaths = 'CACHE_PATHS'
 }
 
 export enum Outputs {

src/util.ts

@@ -61,3 +61,12 @@ async function getToolVersion(tool: string, options: string[]) {
     return '';
   }
 }
+
+export const unique = () => {
+  const encountered = new Set();
+  return (value: unknown): boolean => {
+    if (encountered.has(value)) return false;
+    encountered.add(value);
+    return true;
+  };
+};