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psql's editing commands decide whether the user has edited the file by checking for change of modification timestamp. This is probably fine for a pre-existing file, but with a temporary file that is created within the command, it's possible for a fast typist to save-and-exit in less than the one-second granularity of stat(2) timestamps. On Windows FAT filesystems the granularity is even worse, 2 seconds, making the race a bit easier to hit. To fix, try to set the temp file's mod time to be two seconds ago. It's unlikely this would fail, but then again the race condition itself is unlikely, so just ignore any error. Also, we might as well check the file size as well as its mod time. While this is a difficult bug to hit, it still seems worth back-patching, to ensure that users' edits aren't lost. Laurenz Albe, per gripe from Jacob Champion; based on fix suggestions from Jacob and myself Discussion: https://postgr.es/m/0ba3f2a658bac6546d9934ab6ba63a805d46a49b.camel@cybertec.at
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/.