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The existing test script does run pg_basebackup with the -Ft option, but it makes no real attempt to verify the sanity of the results. We wouldn't know if the output is incompatible with standard "tar" programs, nor if the server fails to start from the restored output. Notably, this means that xlog.c's read_tablespace_map() is not being meaningfully tested, since that code is used only in the tar-format case. (We do have reasonable coverage of restoring from plain-format output, though it's over in src/test/recovery not here.) Hence, attempt to untar the output and start a server from it, rather just hoping it's OK. This test assumes that the local "tar" has the "-C directory" switch. Although that's not promised by POSIX, my research suggests that all non-extinct tar implementations have it. Should the buildfarm's opinion differ, we can complicate the test a bit to avoid requiring that. Possibly this should be back-patched, but I'm unsure about whether it could work on Windows before d66b23b03.
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/.