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Since d62bcc8, the directory method of walmethods.c uses the compression
method to determine which code path to take. The tar method, used by
pg_basebackup --format=t, was inconsistent regarding that, as it relied
on the compression level to check if no compression or gzip should be
used. This commit makes the code more consistent as a whole in this
file, making the tar logic use a compression method rather than
assigning COMPRESSION_NONE that would be ignored.
The options of pg_basebackup are planned to be reworked but we are not
sure yet of the shape they should have as this has some dependency with
the integration of the server-side compression for base backups, so this
is left out for the moment. This change has as benefit to make easier
the future integration of new compression methods for the tar method of
walmethods.c, for the client-side compression.
Reviewed-by: Georgios Kokolatos
Discussion: https://postgr.es/m/Yb3GEgWwcu4wZDuA@paquier.xyz
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/.