[PATCH v2 3/4] services: certbot: Add a default deploy hook to reload nginx.

[Carlo Zancanaro <carlo@zancanaro.id.au>]

* gnu/services/certbot.scm (%default-deploy-hook): New variable.
(<certificate-configuration>)[deploy-hook]: Use it as default deploy hook.
* doc/guix.texi (Certificate services): Document new default deploy hook.

Change-Id: Ibb10481170a6fda7df72492072b939dd6a6ad176
---
 doc/guix.texi            |  6 +++++-
 gnu/services/certbot.scm | 13 +++++++++++--
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 58a65fe0b7..0f372a460f 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -32681,7 +32681,7 @@ Certificate Services
 additionally @code{$CERTBOT_AUTH_OUTPUT} will contain the standard output
 of the @code{auth-hook} script.
 
-@item @code{deploy-hook} (default: @code{#f})
+@item @code{deploy-hook} (default: @code{%default-deploy-hook})
 Command to be run in a shell once for each successfully issued
 certificate.  For this command, the shell variable
 @code{$RENEWED_LINEAGE} will point to the config live subdirectory (for
@@ -32690,6 +32690,10 @@ Certificate Services
 contain a space-delimited list of renewed certificate domains (for
 example, @samp{"example.com www.example.com"}.
 
+The default deploy hook calls the @code{reload} action of the
+@code{nginx} Shepherd service, to reload the newly generated
+certificates.
+
 @item @code{start-self-signed?} (default: @code{#t})
 Whether to generate an initial self-signed certificate during system
 activation.  This option is particularly useful to allow @code{nginx} to
diff --git a/gnu/services/certbot.scm b/gnu/services/certbot.scm
index 10b99f5630..490b9e8d6d 100644
--- a/gnu/services/certbot.scm
+++ b/gnu/services/certbot.scm
@@ -37,7 +37,8 @@ (define-module (gnu services certbot)
   #:use-module (srfi srfi-1)
   #:use-module (ice-9 format)
   #:use-module (ice-9 match)
-  #:export (certbot-service-type
+  #:export (%default-deploy-hook
+            certbot-service-type
             certbot-configuration
             certbot-configuration?
             certificate-configuration))
@@ -49,6 +50,14 @@ (define-module (gnu services certbot)
 ;;; Code:
 
 \f
+(define %default-deploy-hook
+  (program-file
+   "reload-nginx.scm"
+   (with-imported-modules '((gnu services herd))
+     #~(begin
+         (use-modules (gnu services herd))
+         (with-shepherd-action 'nginx ('reload) result result)))))
+
 (define-record-type* <certificate-configuration>
   certificate-configuration make-certificate-configuration
   certificate-configuration?
@@ -65,7 +74,7 @@ (define-record-type* <certificate-configuration>
   (cleanup-hook        certificate-cleanup-hook
                        (default #f))
   (deploy-hook         certificate-configuration-deploy-hook
-                       (default #f))
+                       (default %default-deploy-hook))
   (start-self-signed?  certificate-configuration-start-self-signed?
                        (default #t)))
 
-- 
2.41.0