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Historically, the location of any files generated by pg_upgrade, as of the per-database logs and internal dumps, has been the current working directory, leaving all those files behind when using --retain or on a failure. Putting all those contents in a targeted subdirectory makes the whole easier to debug, and simplifies the code in charge of cleaning up the logs. Note that another reason is that this facilitates the move of pg_upgrade to TAP with a fixed location for all the logs to grab if the test fails repeatedly. Initially, we thought about being able to specify the output directory with a new option, but we have settled on using a subdirectory located at the root of the new cluster's data folder, "pg_upgrade_output.d", instead, as at the end the new data directory is the location of all the data generated by pg_upgrade. There is a take with group permissions here though: if the new data folder has been initialized with this option, we need to create all the files and paths with the correct permissions or a base backup taken after a pg_upgrade --retain would fail, meaning that GetDataDirectoryCreatePerm() has to be called before creating the log paths, before a couple of sanity checks on the clusters and before getting the socket directory for the cluster's host settings. The idea of the new location is based on a suggestion from Peter Eisentraut. Also thanks to Andrew Dunstan, Peter Eisentraut, Daniel Gustafsson, Tom Lane and Bruce Momjian for the discussion (in alphabetical order). Author: Justin Pryzby Discussion: https://postgr.es/m/20211212025017.GN17618@telsasoft.com |
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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/.