services: base: Deprecate 'rngd-service' procedure.

* doc/guix.texi (Base Services): Replace rngd-service with rngd-service-type.
Document <rngd-configuration>.
* gnu/services/base.scm (<rngd-configuration>): Set default values from
the values in the now deprecated 'rngd-service' procedure.
(rngd-service): Deprecate procedure.
(rngd-service-type): Set default value.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

2 files changed, 27 insertions, 13 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index f4bfb8a24f..1edbad33c6 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -18919,13 +18919,24 @@ seconds for the negative lookups.  @xref{Invoking guix publish,
 @end table
 @end deftp
 
-@anchor{rngd-service}
-@deffn {Scheme Procedure} rngd-service [#:rng-tools @var{rng-tools}] @
-            [#:device "/dev/hwrng"]
-Return a service that runs the @command{rngd} program from @var{rng-tools}
-to add @var{device} to the kernel's entropy pool.  The service will fail if
-@var{device} does not exist.
-@end deffn
+@defvar rngd-service-type
+Type of the service that runs rng-tools rngd, whose value is a
+@code{<rngd-configuration>} object.
+@end defvar
+
+@deftp {Data Type} rngd-configuration
+Data type representing the configuration of rngd.
+
+@table @asis
+@item @code{rng-tools} (default: @code{rng-tools}) (type: file-like)
+Package object of the rng-tools rngd.
+
+@item @code{device} (default: @var{"/dev/hwrng"}) (type: string)
+Path of the device to add to the kernel's entropy pool.  The service
+will fail if @var{device} does not exist.
+
+@end table
+@end deftp
 
 @anchor{pam-limits-service}
 @cindex session limits
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index b183cf58c1..1423ab6767 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -239,7 +239,7 @@
             rngd-configuration
             rngd-configuration?
             rngd-service-type
-            rngd-service
+            rngd-service  ; deprecated
 
             kmscon-configuration
             kmscon-configuration?
@@ -662,8 +662,10 @@ down.")))
 (define-record-type* <rngd-configuration>
   rngd-configuration make-rngd-configuration
   rngd-configuration?
-  (rng-tools rngd-configuration-rng-tools)        ;file-like
-  (device    rngd-configuration-device))          ;string
+  (rng-tools rngd-configuration-rng-tools         ;file-like
+             (default rng-tools))
+  (device    rngd-configuration-device            ;string
+             (default "/dev/hwrng")))
 
 (define rngd-service-type
   (shepherd-service-type
@@ -682,12 +684,13 @@ down.")))
         (provision '(trng))
         (start #~(make-forkexec-constructor '#$rngd-command))
         (stop #~(make-kill-destructor))))
+    (rngd-configuration)
     (description "Run the @command{rngd} random number generation daemon to
 supply entropy to the kernel's pool.")))
 
-(define* (rngd-service #:key
-                       (rng-tools rng-tools)
-                       (device "/dev/hwrng"))
+(define-deprecated (rngd-service #:key (rng-tools rng-tools)
+                                 (device "/dev/hwrng"))
+  rngd-service-type
   "Return a service that runs the @command{rngd} program from @var{rng-tools}
 to add @var{device} to the kernel's entropy pool.  The service will fail if
 @var{device} does not exist."