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When we're creating subdirectories of PGDATA during initdb, we know darn well that the parent directory exists (or should exist) and that the new subdirectory doesn't (or shouldn't). There is therefore no need to use anything more complicated than mkdir(). Using pg_mkdir_p() just opens us up to unexpected failure modes, such as the one exhibited in bug #13853 from Nuri Boardman. It's not very clear why pg_mkdir_p() went wrong there, but it is clear that we didn't need to be trying to create parent directories in the first place. We're not even saving any code, as proven by the fact that this patch nets out at minus five lines. Since this is a response to a field bug report, back-patch to all branches.
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/.