Merge 3c3e99848b36c587c8046383ab04e86713061576 into de5a000abf73b6f4965bd1bcdf8f8d94a56ea815

README.md

@@ -79,6 +79,8 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
     clean: ''
 
     # Partially clone against a given filter. Overrides sparse-checkout if set.
+    # Note that when a filter is provided, fetch-depth is still respected; you
+    # may want to specify `fetch-depth: 0` to ensure the full history is fetched.
     # Default: null
     filter: ''
 

__test__/ref-helper.test.ts

@@ -77,6 +77,16 @@ describe('ref-helper tests', () => {
     expect(checkoutInfo.startPoint).toBeFalsy()
   })
 
+  it('getCheckoutInfo refs/ without commit', async () => {
+    const checkoutInfo = await refHelper.getCheckoutInfo(
+      git,
+      'refs/non-standard-ref',
+      ''
+    )
+    expect(checkoutInfo.ref).toBe('refs/non-standard-ref')
+    expect(checkoutInfo.startPoint).toBeFalsy()
+  })
+
   it('getCheckoutInfo unqualified branch only', async () => {
     git.branchExists = jest.fn(async (remote: boolean, pattern: string) => {
       return true

action.yml

@@ -59,8 +59,9 @@ inputs:
     default: true
   filter:
     description: >
-      Partially clone against a given filter.
+      Partially clone against a given filter. Overrides sparse-checkout if set.
-      Overrides sparse-checkout if set.
+      Note that when a filter is provided, fetch-depth is still respected; you
+      may want to specify `fetch-depth: 0` to ensure the full history is fetched.
     default: null
   sparse-checkout:
     description: >

dist/index.js

@@ -2005,8 +2005,8 @@ function getCheckoutInfo(git, ref, commit) {
             result.ref = ref;
         }
         // refs/
-        else if (upperRef.startsWith('REFS/') && commit) {
+        else if (upperRef.startsWith('REFS/')) {
-            result.ref = commit;
+            result.ref = commit ? commit : ref;
         }
         // Unqualified ref, check for a matching branch or tag
         else {

src/ref-helper.ts

@@ -46,8 +46,8 @@ export async function getCheckoutInfo(
     result.ref = ref
   }
   // refs/
-  else if (upperRef.startsWith('REFS/') && commit) {
+  else if (upperRef.startsWith('REFS/')) {
-    result.ref = commit
+    result.ref = commit ? commit : ref
   }
   // Unqualified ref, check for a matching branch or tag
   else {