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Tom Lane c4b7be4ecb Further harden tests that might use not-so-compatible tar versions. 
Buildfarm testing shows that OpenSUSE (and perhaps related platforms?)
configures GNU tar in such a way that it'll archive sparse WAL files
by default, thus triggering the pax-extension detection code added by
bc30c704a.  Thus, we need something similar to 852de579a but for
GNU tar's option set.  "--format=ustar" seems to do the trick.

Moreover, the buildfarm shows that pg_verifybackup's 003_corruption.pl
test script is also triggering creation of pax-format tar files on
that platform.  We had not noticed because those test cases all fail
(intentionally) before getting to the point of trying to verify WAL
data.

Since that means two TAP scripts need this option-selection logic, and
plausibly more will do so in future, factor it out into a subroutine
in Test::Utils.  We also need to back-patch the 003_corruption.pl fix
into v18, where it's also failing.

While at it, clean up some places where guards for $tar being empty
or undefined were incomplete or even outright backwards.  Presumably,
we missed noticing because the set of machines that run TAP tests
and don't have tar installed is empty.  But if we're going to try
to handle that scenario, we should do it correctly.

Reported-by: Tomas Vondra <tomas@vondra.me>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/02770bea-b3f3-4015-8a43-443ae345379c@vondra.me
Backpatch-through: 18
2026-04-02 17:21:18 -04:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
contrib Avoid memory leak on error while parsing pg_stat_statements dump file 2026-03-27 12:21:29 +02:00
doc doc: Add missing description for DROP SUBSCRIPTION IF EXISTS. 2026-04-01 09:48:48 -05:00
src Further harden tests that might use not-so-compatible tar versions. 2026-04-02 17:21:18 -04:00
.abi-compliance-history Update .abi-compliance-history for AddRelationNotNullConstraints(). 2026-02-21 13:08:44 +01:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:53 -04:00
.cirrus.tasks.yml Fix typo 2026-01-07 15:48:45 +01:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:33:44 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add script to keep .editorconfig in sync with .gitattributes 2025-02-01 10:09:45 +01:00
.git-blame-ignore-revs Add previous commit to .git-blame-ignore-revs. 2025-10-21 10:02:19 -05:00
.gitattributes Fix git whitespace warning 2025-08-15 10:32:22 +02:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
configure.ac Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Adapt REL_18_STABLE to its new status as a stable branch 2025-06-29 23:00:00 -04:00
meson.build Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2026-02-25 11:57:26 -05:00
meson_options.txt Add support for basic NUMA awareness 2025-04-07 23:08:17 +02:00
README.md Adapt REL_18_STABLE to its new status as a stable branch 2025-06-29 23:00:00 -04:00

README.md

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.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/18/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/18/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.