rust/hg-core/src/dirstate_tree/status.rs

51699:bd1483fd7088

            Ok(Some(directory_mtime)) => directory_mtime,
            Ok(None) => {
                // The directory was modified too recently,
                // don’t cache its `read_dir` results.
                //
                // 1. A change to this directory (direct child was added or
                //    removed) cause its mtime to be set (possibly truncated)
                //    to `directory_mtime`
                // 2. This `status` algorithm calls `read_dir`
                // 3. An other change is made to the same directory is made so
                //    that calling `read_dir` agin would give different
                //    results, but soon enough after 1. that the mtime stays
                //    the same
                //
                // On a system where the time resolution poor, this
                // scenario is not unlikely if all three steps are caused
                // by the same script.
                return Ok(());

51700:7f0cb9ee0534

            Ok(Some(directory_mtime)) => directory_mtime,
            Ok(None) => {
                // The directory was modified too recently,
                // don’t cache its `read_dir` results.
                //
                // 1. A change to this directory (direct child was
                //    added or removed) cause its mtime to be set
                //    (possibly truncated) to `directory_mtime`
                // 2. This `status` algorithm calls `read_dir`
                // 3. An other change is made to the same directory is
                //    made so that calling `read_dir` agin would give
                //    different results, but soon enough after 1. that
                //    the mtime stays the same
                //
                // On a system where the time resolution poor, this
                // scenario is not unlikely if all three steps are caused
                // by the same script.
                return Ok(());