services: postgresql: Change service default socket directory.

Fixes <https://bugs.gnu.org/46737>.

PostgreSQL running with a different socket directory to the default one in the
package itself breaks some services, this commit restores the previous
behaviour where PostgreSQL by default will run with a socket directory that
matches the default used by PostgreSQL packaged for Guix.

Switching to a different default value can happen, but only alongside changing
the PostgreSQL package.

* gnu/services/databases.scm (<postgresql-config-file>)[socket-directory]:
Change default to #false.
* doc/guix.texi (Database Services): Update documentation, and specify a
different value for disabling connections via sockets.
* gnu/tests/guix.scm (%guix-data-service-os): Use default PostgreSQL
behaviour.
* gnu/tests/monitoring.scm (%zabbix-os): Likewise.
* gnu/tests/web.scm (patchwork-os): Likewise.

Signed-off-by: Leo Famulari <leo@famulari.name>

1 files changed, 1 insertions, 6 deletions

diff --git a/gnu/tests/web.scm b/gnu/tests/web.scm
index cc0e79c8b2..7f4518acd2 100644
--- a/gnu/tests/web.scm
+++ b/gnu/tests/web.scm
@@ -569,12 +569,7 @@ HTTP-PORT."
                (listen '("8080"))))))
    (service postgresql-service-type
             (postgresql-configuration
-             (postgresql postgresql-10)
-             ;; XXX: Remove when postgresql default socket directory is
-             ;; changed to /var/run/postgresql.
-             (config-file
-              (postgresql-config-file
-               (socket-directory #f)))))
+             (postgresql postgresql-10)))
    (service patchwork-service-type
             (patchwork-configuration
              (patchwork patchwork)