services: databases: Don't specify a default postgresql version.

Currently, if the postgresql package major version changes, this is going to
break the service upon upgrade, because PostgreSQL will reject the data files
from the differing major version of the service.

Because it's important to either keep running a particular major version, or
intentionally upgrade, I think the configuration would be better with no
default. I think this is also going to be helpful when trying to assist users
upgrading PostgreSQL.

* gnu/services/databases.scm (<postgresql-configuration>): Remove default for
postgresql.
(postgresql-service-type): Remove the default value.
* gnu/tests/databases.scm (%postgresql-os): Update accordingly.
* gnu/tests/guix.scm (%guix-data-service-os): Update accordingly.
* gnu/tests/monitoring.scm (%zabbix-os): Update accordingly.
* gnu/tests/web.scm (patchwork-os): Update accordingly.
* doc/guix.texi (PostgreSQL): Update accordingly.

6 files changed, 16 insertions, 9 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 582ab0fd2b..05111d4327 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -18457,7 +18457,9 @@ The following example describes a PostgreSQL service with the default
 configuration.
 
 @lisp
-(service postgresql-service-type)
+(service postgresql-service-type
+         (postgresql-configuration
+          (postgresql postgresql-10)))
 @end lisp
 
 If the services fails to start, it may be due to an incompatible
@@ -18483,7 +18485,7 @@ Data type representing the configuration for the
 @code{postgresql-service-type}.
 
 @table @asis
-@item @var{postgresql} (default: @code{postgresql})
+@item @var{postgresql}
 PostgreSQL package to use for the service.
 
 @item @var{port} (default: @code{5432})
diff --git a/gnu/services/databases.scm b/gnu/services/databases.scm
index 7908a3e0f6..d7b4594b9e 100644
--- a/gnu/services/databases.scm
+++ b/gnu/services/databases.scm
@@ -147,8 +147,7 @@ host	all	all	::1/128 	md5"))
 (define-record-type* <postgresql-configuration>
   postgresql-configuration make-postgresql-configuration
   postgresql-configuration?
-  (postgresql         postgresql-configuration-postgresql ;<package>
-                      (default postgresql))
+  (postgresql         postgresql-configuration-postgresql) ;<package>
   (port               postgresql-configuration-port
                       (default 5432))
   (locale             postgresql-configuration-locale
@@ -279,8 +278,7 @@ host	all	all	::1/128 	md5"))
                        (service-extension account-service-type
                                           (const %postgresql-accounts))
                        (service-extension profile-service-type
-                                          (compose list postgresql-configuration-postgresql))))
-                (default-value (postgresql-configuration))))
+                                          (compose list postgresql-configuration-postgresql))))))
 
 (define-deprecated (postgresql-service #:key (postgresql postgresql)
                                        (port 5432)
diff --git a/gnu/tests/databases.scm b/gnu/tests/databases.scm
index e0544bbcd2..d3045cc3f7 100644
--- a/gnu/tests/databases.scm
+++ b/gnu/tests/databases.scm
@@ -215,7 +215,9 @@
 
 (define %postgresql-os
   (simple-operating-system
-   (service postgresql-service-type)))
+   (service postgresql-service-type
+            (postgresql-configuration
+             (postgresql postgresql-10)))))
 
 (define (run-postgresql-test)
   "Run tests in %POSTGRESQL-OS."
diff --git a/gnu/tests/guix.scm b/gnu/tests/guix.scm
index 20b67d55d3..af7d8f0b21 100644
--- a/gnu/tests/guix.scm
+++ b/gnu/tests/guix.scm
@@ -156,6 +156,7 @@
    (service dhcp-client-service-type)
    (service postgresql-service-type
             (postgresql-configuration
+             (postgresql postgresql-10)
              (config-file
               (postgresql-config-file
                (hba-file
diff --git a/gnu/tests/monitoring.scm b/gnu/tests/monitoring.scm
index 17b9edc3ac..7371b02fe1 100644
--- a/gnu/tests/monitoring.scm
+++ b/gnu/tests/monitoring.scm
@@ -307,7 +307,9 @@ zabbix||{}
   (let ((base-os
          (simple-operating-system
           (service dhcp-client-service-type)
-          (service postgresql-service-type)
+          (service postgresql-service-type
+                   (postgresql-configuration
+                    (postgresql postgresql-10)))
           (service zabbix-front-end-service-type
                    (zabbix-front-end-configuration
                     (db-password "zabbix")))
diff --git a/gnu/tests/web.scm b/gnu/tests/web.scm
index 7513eab2e4..7f4518acd2 100644
--- a/gnu/tests/web.scm
+++ b/gnu/tests/web.scm
@@ -567,7 +567,9 @@ HTTP-PORT."
              (config
               (httpd-config-file
                (listen '("8080"))))))
-   (service postgresql-service-type)
+   (service postgresql-service-type
+            (postgresql-configuration
+             (postgresql postgresql-10)))
    (service patchwork-service-type
             (patchwork-configuration
              (patchwork patchwork)