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This allows control of the directory in which the postmaster sockets are created for the temporary postmasters started by pg_upgrade. The default location remains the current working directory, which is typically fine, but if it is deeply nested then its pathname might be too long to be a socket name. In passing, clean up some messiness in pg_upgrade's option handling, particularly the confusing and undocumented way that configuration-only datadirs were handled. And fix check_required_directory's substantially under-baked cleanup of directory pathnames. Daniel Gustafsson, reviewed by Hironobu Suzuki, some code cleanup by me Discussion: https://postgr.es/m/E72DD5C3-2268-48A5-A907-ED4B34BEC223@yesql.se
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/.