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Switch to get_dirent_type() instead of lstat() while traversing a directory tree, to see if that fixes the intermittent ENOTEMPTY failures seen in recent pg_upgrade tests, on Windows CI. While refactoring, also use AllocateDir() instead of opendir() in the backend, which knows how to handle descriptor pressure. Our CI system currently uses Windows Server 2019, a version known not to have POSIX unlink semantics enabled by default yet, unlike typical Windows 10 and 11 systems. That might explain why we see this flapping on CI but (apparently) not in the build farm, though the frequency is quite low. The theory is that some directory entry must be in state STATUS_DELETE_PENDING, which lstat() would report as ENOENT, though unfortunately we don't know exactly why yet. With this change, rmtree() will not skip them, and try to unlink (again). Our unlink() wrapper should either wait a short time for them to go away when some other process closes the handle, or log a message to tell us the path of the problem file if not, so we can dig further. Discussion: https://postgr.es/m/20220919213217.ptqfdlcc5idk5xup%40awork3.anarazel.de
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.