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Since Postgres 10, SHOW commands can be triggered with replication connections in a WAL sender context, however it missed that a transaction context is needed for syscache lookups. This commit makes sure that the syscache lookups can happen correctly by setting a transaction context when running SHOW commands in a WAL sender. Superuser-only parameters can be displayed using SHOW commands not only to superusers, but also to members of system role pg_read_all_settings, which requires a syscache lookup to check if the connected role is a member of this system role or not, or the instance crashes. Superusers do not need to check the syscache so it worked correctly in this case. New tests are added to cover this issue. Reported-by: Alexander Kukushkin Author: Michael Paquier Reviewed-by: Álvaro Herrera Discussion: https://postgr.es/m/15734-2daa8761eeed8e20@postgresql.org Backpatch-through: 10
PostgreSQL tests ================ This directory contains a variety of test infrastructure as well as some of the tests in PostgreSQL. Not all tests are here -- in particular, there are more in individual contrib/ modules and in src/bin. Not all these tests get run by "make check". Check src/test/Makefile to see which tests get run automatically. authentication/ Tests for authentication examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level locale/ Sanity checks for locale data, encodings, etc mb/ Tests for multibyte encoding (UTF-8) support modules/ Extensions used only or mainly for test purposes, generally not suitable for installing in production databases perl/ Infrastructure for Perl-based TAP tests recovery/ Test suite for recovery and replication regress/ PostgreSQL's main regression test suite, pg_regress ssl/ Tests to exercise and verify SSL certificate handling subscription/ Tests for logical replication thread/ A thread-safety-testing utility used by configure