[bug#43333] [PATCH] services: certbot: Support registration without email.

[Timotej Lazar <timotej.lazar@araneo.si>]

* gnu/services/certbot.scm (certbot-configuration): Add default for the
email option.
(certbot-command): Pass email for registration only when specified.
* doc/guix.texi (Certificate Services): "mandatory"→"optional" email.
---
Allow registering a Let’s Encrypt account without an email address,
which is dicouraged but possible. I tried factoring out the common
options for HTTP/manual challenges but it turned out quite messy, so I
just added the option for both cases.

Thanks!

 doc/guix.texi            |  7 ++++---
 gnu/services/certbot.scm | 11 ++++++++---
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index bad2d36e42..a8e7b27349 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -22469,9 +22469,10 @@ A list of @code{certificates-configuration}s for which to generate
 certificates and request signatures.  Each certificate has a @code{name}
 and several @code{domains}.
 
-@item @code{email}
-Mandatory email used for registration, recovery contact, and important
-account notifications.
+@item @code{email} (default: @code{#f})
+Optional email address used for registration and recovery contact.
+Setting this is encouraged as it allows you to receive important
+notifications about the account and issued certificates.
 
 @item @code{server} (default: @code{#f})
 Optional URL of ACME server.  Setting this overrides certbot's default,
diff --git a/gnu/services/certbot.scm b/gnu/services/certbot.scm
index 5643340799..1c67ff63f1 100644
--- a/gnu/services/certbot.scm
+++ b/gnu/services/certbot.scm
@@ -71,7 +71,8 @@
                        (default "/var/www"))
   (certificates        certbot-configuration-certificates
                        (default '()))
-  (email               certbot-configuration-email)
+  (email               certbot-configuration-email
+                       (default #f))
   (server              certbot-configuration-server
                        (default #f))
   (rsa-key-size        certbot-configuration-rsa-key-size
@@ -99,12 +100,14 @@
                    (if challenge
                      (append
                       (list name certbot "certonly" "-n" "--agree-tos"
-                            "-m" email
                             "--manual"
                             (string-append "--preferred-challenges=" challenge)
                             "--cert-name" name
                             "--manual-public-ip-logging-ok"
                             "-d" (string-join domains ","))
+                      (if email
+                          `("--email" ,email)
+                          '("--register-unsafely-without-email"))
                       (if server `("--server" ,server) '())
                       (if rsa-key-size `("--rsa-key-size" ,rsa-key-size) '())
                       (if authentication-hook
@@ -114,10 +117,12 @@
                       (if deploy-hook `("--deploy-hook" ,deploy-hook) '()))
                      (append
                       (list name certbot "certonly" "-n" "--agree-tos"
-                            "-m" email
                             "--webroot" "-w" webroot
                             "--cert-name" name
                             "-d" (string-join domains ","))
+                      (if email
+                          `("--email" ,email)
+                          '("--register-unsafely-without-email"))
                       (if server `("--server" ,server) '())
                       (if rsa-key-size `("--rsa-key-size" ,rsa-key-size) '())
                       (if deploy-hook `("--deploy-hook" ,deploy-hook) '()))))))
-- 
2.28.0