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The original coding for ALTER SYSTEM made a fundamentally bogus assumption that postgresql.auto.conf could be sought relative to the main config file if we hadn't yet determined the value of data_directory. This fails for common arrangements with the config file elsewhere, as reported by Christoph Berg. The simplest fix is to not try to read postgresql.auto.conf until after SelectConfigFiles has chosen (and locked down) the data_directory setting. Because of the logic in ProcessConfigFile for handling resetting of GUCs that've been removed from the config file, we cannot easily read the main and auto config files separately; so this patch adopts a brute force approach of reading the main config file twice during postmaster startup. That's a tad ugly, but the actual time cost is likely to be negligible, and there's no time for a more invasive redesign before beta. With this patch, any attempt to set data_directory via ALTER SYSTEM will be silently ignored. It would probably be better to throw an error, but that can be dealt with later. This bug, however, would prevent any testing of ALTER SYSTEM by a significant fraction of the userbase, so it seems important to get it fixed before beta.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.