Data race is being flagged because a goroutine is currently writing tar data into `atar`, and `assert.NotEmpty(atar)` performs internal structure reflection into the returned `io.PipeWriter` and violates its internal synchronization primitives. This assertion doesn't seem to add any value to the test compared to just reading the pipe, so it has been removed.
Data race details (abbreviated):
```
==================
WARNING: DATA RACE
Write at 0x00c00041fbc0 by goroutine 55:
sync/atomic.CompareAndSwapInt32()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/runtime/race_amd64.s:361
+0xb
sync/atomic.CompareAndSwapInt32()
<autogenerated>:1 +0x18
sync.(*Mutex).Lock()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/sync/mutex.go:46
+0x28
io.(*pipe).write()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/io/pipe.go:81
+0x9e
io.(*PipeWriter).Write()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/io/pipe.go:161
+0x46
archive/tar.(*Writer).Flush()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/archive/tar/writer.go:59
+0xcc
archive/tar.(*Writer).WriteHeader()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/archive/tar/writer.go:71
+0x46
code.forgejo.org/forgejo/runner/v9/act/runner.actionCacheCopyFileOrDir()
/home/mfenniak/Dev/forgejo-runner/act/runner/action_cache.go:203
+0xabd
code.forgejo.org/forgejo/runner/v9/act/runner.GoGitActionCache.GetTarArchive.func2.1()
/home/mfenniak/Dev/forgejo-runner/act/runner/action_cache.go:154
+0xa5
...
Previous read at 0x00c00041fbc0 by goroutine 9:
reflect.typedmemmove()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/runtime/mbarrier.go:213
+0x0
reflect.packEface()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/reflect/value.go:136
+0xc5
reflect.valueInterface()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/reflect/value.go:1513
+0x179
reflect.Value.Interface()
/home/mfenniak/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.6.linux-amd64/src/reflect/value.go:1484
+0x106
github.com/stretchr/testify/assert.isEmpty()
/home/mfenniak/go/pkg/mod/github.com/stretchr/testify@v1.10.0/assert/assertions.go:735
+0x7f
github.com/stretchr/testify/assert.NotEmpty()
/home/mfenniak/go/pkg/mod/github.com/stretchr/testify@v1.10.0/assert/assertions.go:769
+0x56
github.com/stretchr/testify/assert.(*Assertions).NotEmpty()
/home/mfenniak/go/pkg/mod/github.com/stretchr/testify@v1.10.0/assert/assertion_forward.go:1175
+0xb1
code.forgejo.org/forgejo/runner/v9/act/runner.TestActionCache.func1()
/home/mfenniak/Dev/forgejo-runner/act/runner/action_cache_test.go:60
+0x21e
==================
```
<!--start release-notes-assistant-->
<!--URL:https://code.forgejo.org/forgejo/runner-->
- other
- [PR](https://code.forgejo.org/forgejo/runner/pulls/858): <!--number 858 --><!--line 0 --><!--description dGVzdDogcHJldmVudCBkYXRhIHJhY2UgZGV0ZWN0aW9uIGluIFRlc3RBY3Rpb25DYWNoZSBbc2tpcCBjYXNjYWRlXQ==-->test: prevent data race detection in TestActionCache [skip cascade]<!--description-->
<!--end release-notes-assistant-->
Reviewed-on: https://code.forgejo.org/forgejo/runner/pulls/858
Reviewed-by: Gusted <gusted@noreply.code.forgejo.org>
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net>
Only changes test files.
---
- remove tests specific to running on a host with no container
they are the same as with the containers (TestRunEventHostEnvironment)
- prefix the name of the tests with a distinctive name to
more easily run them together
- use code.forgejo.org/oci images whereever possible
- remove some tests that are either
- difficult to understand (ancient bugs)
- not yet well understood (related to reusable workflows)
- depend on github (generation of workflows to be run on the fly
e.g. updateTestIfWorkflow)
- fix the TestSanitizeNetworkAlias tests that were not run
and make them easier to debug
- disable tests of options that are forbidden in Forgejo Actions
(testdata/container-hostname/push.yml)
Reviewed-on: https://code.forgejo.org/forgejo/act/pulls/202
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>
