The tree opens files via the xopenat() family, but nothing stops new code from calling open() directly, and the repart manifest code already did so after the migration. Let's port the tests, fuzzers and the two remaining direct calls in chase and repart to xopenat(), and then add open(), openat() and creat() to bugprone-unsafe-functions so that clang-tidy reports new direct calls. The functions that implement xopenat() and fd_reopen(), the seccomp tests and the O_EMPTYPATH probe in test-fd-util.c keep calling the syscalls directly and suppress the check. openat2() can't be covered, since it's a macro for openat2_shim() and the check ignores calls from macro expansions.
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