Merge pull request #1132 from actions/pdotl-empty-cache-bugfix

Fix Empty Cache save when the path is github workspace directory

packages/cache/__tests__/cacheUtils.test.ts

@@ -32,3 +32,9 @@ test('assertDefined throws if undefined', () => {
 test('assertDefined returns value', () => {
   expect(cacheUtils.assertDefined('test', 5)).toBe(5)
 })
+
+test('resolvePaths works on github workspace directory', async () => {
+  const workspace = process.env['GITHUB_WORKSPACE'] ?? '.'
+  const paths = await cacheUtils.resolvePaths([workspace])
+  expect(paths.length).toBeGreaterThan(0)
+})

packages/cache/src/internal/cacheUtils.ts

@@ -52,7 +52,12 @@ export async function resolvePaths(patterns: string[]): Promise<string[]> {
       .replace(new RegExp(`\\${path.sep}`, 'g'), '/')
     core.debug(`Matched: ${relativeFile}`)
     // Paths are made relative so the tar entries are all relative to the root of the workspace.
-    paths.push(`${relativeFile}`)
+    if (relativeFile === '') {
+      // path.relative returns empty string if workspace and file are equal
+      paths.push('.')
+    } else {
+      paths.push(`${relativeFile}`)
+    }
   }
 
   return paths