Backport patches to 0.37 #876
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* Fix `rustix::fs::Dir` to avoid unbounded buffer growth. Fix `Dir`'s buffer size computation to avoid resizing past a fixed upper limit. This prevents it from growing without bound, such as in the case of `Dir::rewind` for repeated iterations with the same `Dir`. * Don't let `Dir` continue to try to iterate after a failure. * Handle `io::Errno::INTR` gracefully. * Write a more detailed comment on the buffer growth policy. * Also mention that no buffer can ever be big enough for everything. * Add tests against over-allocation & stuck iterator * Rm `dir_iterator_does_not_overallocate` unit test in favour of docs * Extend `test_dir` to cover `rewind`. * Consistently handle directory removal as ending the stream. libc implementations of directory iteration handle directory removal by just ending the stream. In the linux_raw backend, this looks like `ENOENT` from `getdents64`, so change the code to check for `ENOENT` and end the stream. This requires changing the `dir_iterator_does_not_get_stuck_on_io_error` test to no longer expect a failure, so it's now renamed to `dir_iterator_handles_dir_removal`. To test the error case, add a new `dir_iterator_handles_io_errors` test which uses `dup2` to induce an error, in both the linux_raw and libc backends. This exposes the fact that the libc `Dir` implementation was also assuming that users would stop iterating after hitting a failure, so add a `any_errors` flag to the libc backend as well. * Add a test for removing the directory after doing `read_from`. * In the libc backend, handle `ENOENT` when opening ".". --------- Co-authored-by: cyqsimon <[email protected]>
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Backport 31fd98c and 55cbe88 to the 0.37 branch.