testing.(*T).TempDir() panics in cleanup

[RmbRT]

Issue description

In tests, calling t.TempDir() leads to an error during cleanup:

testing.go:1225: TempDir RemoveAll cleanup: unlinkat /tmp/TestExample406597298: bad file descriptor

In enclave.json, /tmp has been mounted as memfs. I also had tried using hostfs and mounting the native tmp directory, and also tried mounting the root directory as hostfs.

It worked when I used tmp, _ := os.MkdirTemp("", "*") instead, maybe that is an acceptable fix? Although once I added a defer os.RemoveAll(tmp), it also returned an error (not a panic, though). I didn't want to investigate any further, but it seems to be either a problem in os.Remove/All in general, or with temp directories in the ego file system. A superficial fix for t.TempDir() would be to simply not insist on success of the cleanup operation in the testing.go vendor file.

To reproduce

Steps to reproduce the behavior:

1. Create a test.
2. Insert _ = t.TempDir()
3. ego-go test -c && ego sign *.test && ego run *.test (adjust the enclave.json as necessary, obviously)

Expected behavior

I would have expected this to not panic.

Additional info

I am using OE_SIMULATION=1, although that should not affect anything IMO. I'm on Ubuntu 24.

[thomasten]

Thanks for reporting! We can reproduce this and will investigate.

[thomasten]

This is fixed in master and will be included in the next release.