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Michał Górny
342e654b8e
Add a helper function that checks whether the test suite is running inside a systemd-nspawn container, and skip the few tests failing with `--suppress-sync=true` in that case. The tests are failing because `--suppress-sync=true` stubs out `fsync()`, `fdatasync()` and `msync()` calls, and therefore they always return success without checking for invalid arguments. Call `os.open(__file__, os.O_RDONLY | os.O_SYNC)` and check the errno to detect whether `--suppress-sync=true` is actually used, and skip the tests only in that scenario.