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[bug#43771] [PATCH v2 3/5] services: databases: Deprecate the postgresql

From: Christopher Baines
Subject: [bug#43771] [PATCH v2 3/5] services: databases: Deprecate the postgresql-service procedure.
Date: Mon, 19 Oct 2020 20:02:57 +0100

Using the service type directly is a better approach, making it easier to
configure the service.

* gnu/services/databases.scm (postgresql-service): Deprecate this procedure.
* doc/guix.texi (PostgreSQL): Update the documentation for the use of (service
 doc/guix.texi              | 40 +++++++++++++++++++++++++++++---------
 gnu/services/databases.scm | 14 +++++++------
 2 files changed, 39 insertions(+), 15 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index d6d610acae..8aaa896c8d 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -18180,15 +18180,12 @@ The @code{(gnu services databases)} module provides 
the following services.
 @subsubheading PostgreSQL
-@deffn {Scheme Procedure} postgresql-service [#:postgresql postgresql] @
-       [#:config-file] [#:data-directory ``/var/lib/postgresql/data''] @
-       [#:port 5432] [#:locale ``en_US.utf8''] [#:extension-packages '()]
-Return a service that runs @var{postgresql}, the PostgreSQL database
+The following example describes a PostgreSQL service with the default
-The PostgreSQL daemon loads its runtime configuration from @var{config-file},
-creates a database cluster with @var{locale} as the default
-locale, stored in @var{data-directory}.  It then listens on @var{port}.
+(service postgresql-service-type)
+@end lisp
 If the services fails to start, it may be due to an incompatible
 cluster already present in @var{data-directory}.  Adjust it (or, if you
@@ -18208,6 +18205,29 @@ createuser --interactive
 createdb $MY_USER_LOGIN      # Replace appropriately.
 @end example
+@deftp {Data Type} postgresql-configuration
+Data type representing the configuration for the
+@table @asis
+@item @var{postgresql} (default: @code{postgresql})
+PostgreSQL package to use for the service.
+@item @var{port} (default: @code{5432})
+Port on which PostgreSQL should listen.
+@item @var{locale} (default: @code{"en_US.utf8"})
+Locale to use as the default when creating the database cluster.
+@item @var{config-file} (default: @code{(postgresql-config-file)})
+The configuration file to use when running PostgreSQL.  The default
+behaviour uses the postgresql-config-file record with the default values
+for the fields.
+@item @var{data-directory} (default: @code{"/var/lib/postgresql/data"})
+Directory in which to store the data.
+@item @var{extension-packages} (default: @code{'()})
 @cindex postgresql extension-packages
 Additional extensions are loaded from packages listed in
 @var{extension-packages}.  Extensions are available at runtime.  For instance,
@@ -18243,7 +18263,9 @@ psql -U postgres
 There is no need to add this field for contrib extensions such as hstore or
 dblink as they are already loadable by postgresql.  This field is only
 required to add extensions provided by other packages.
-@end deffn
+@end table
+@end deftp
 @subsubheading MariaDB/MySQL
diff --git a/gnu/services/databases.scm b/gnu/services/databases.scm
index 2bddf70f71..7908a3e0f6 100644
--- a/gnu/services/databases.scm
+++ b/gnu/services/databases.scm
@@ -30,6 +30,7 @@
   #:use-module (gnu packages databases)
   #:use-module (guix build-system trivial)
   #:use-module (guix build union)
+  #:use-module (guix deprecation)
   #:use-module (guix modules)
   #:use-module (guix packages)
   #:use-module (guix records)
@@ -281,12 +282,13 @@ host      all     all     ::1/128         md5"))
                                           (compose list 
                 (default-value (postgresql-configuration))))
-(define* (postgresql-service #:key (postgresql postgresql)
-                             (port 5432)
-                             (locale "en_US.utf8")
-                             (config-file (postgresql-config-file))
-                             (data-directory "/var/lib/postgresql/data")
-                             (extension-packages '()))
+(define-deprecated (postgresql-service #:key (postgresql postgresql)
+                                       (port 5432)
+                                       (locale "en_US.utf8")
+                                       (config-file (postgresql-config-file))
+                                       (data-directory 
+                                       (extension-packages '()))
+  postgresql-service-type
   "Return a service that runs @var{postgresql}, the PostgreSQL database server.
 The PostgreSQL daemon loads its runtime configuration from @var{config-file}

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