Panic creating kubebuilder-envtest cache directory

[hanlins]

Encountered following error:

$ kubectl -n infra logs -f eks-provider-db6d54fd5-gzx7t
panic: mkdir /.cache: permission denied

goroutine 1 [running]:
sigs.k8s.io/controller-runtime/pkg/internal/testing/addr.init.0()
	/workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/testing/addr/manager.go:51 +0xda

controller-runtime version: v0.9.6
golang version: go1.17.7

The issue is related to the init function that sets up kubebuilder-envtest caching directory, see code.

The UserCacheDir is supposed to return the cache directory location. In the pod setup, HOME is set to / and XDG_CACHE_HOME is not set so UserCacheDir ends up returning //.cache without emitting error. However, the process doesn't have permission to create directory under that location and thus it paniced.

One walkaround is to manually set XDG_CACHE_HOME to /tmp in deployment spec. It would be great if we have logic that fall back to using /tmp on permission issues.

[skitt]

This is a duplicate of #1799.

[georgettica]

I had this issue and was thinking it was something else. thank you for creating the duplicate! I didn't find it with my google-foo skills.

I will mention on the duplicate issue that note