services: Add rngd-service.

* gnu/services/base.scm (<rngd-configuration>): New record type.
(rngd-service-type): New variable.
(rngd-service): New procedure.
* doc/guix.texi (Base Services): Document it.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 62c0d34805..c9d9bd8977 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -7494,6 +7494,13 @@ created by @command{guix archive --generate-key} (@pxref{Invoking guix
 archive}).  If that is not the case, the service will fail to start.
 @end deffn
 
+@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
 
 @node Scheduled Job Execution
 @subsubsection Scheduled Job Execution