services: dnsmasq: Add shepherd-provision and shepherd-requirement fields.

* gnu/services/dns.scm (<dnsmasq-configuration>)[provision]: Mark
filed as deprecated with a warning.  Set default to #f.
[shepherd-provision]: Add new field for consistency with other services.
[shepherd-requirement]: Add new field.
(dnsmasq-shepherd-service): Use them.
* doc/guix.texi: Document these changes.
* doc/guix-cookbook.texi (Custom NAT-based network for libvirt): Update
example to use 'shepherd-provision' instead of 'provision'.

Change-Id: Icad4d9c4be5bf58368e8c416f1fdde1f9065557d
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

3 files changed, 30 insertions, 9 deletions

diff --git a/doc/guix-cookbook.texi b/doc/guix-cookbook.texi
index fb58866d40..3ebe661a07 100644
--- a/doc/guix-cookbook.texi
+++ b/doc/guix-cookbook.texi
@@ -4018,8 +4018,8 @@ guests connected to this virtual network switch:
 (service dnsmasq-service-type
          (dnsmasq-configuration
           ;; You can have multiple instances of `dnsmasq-service-type` as long
-          ;; as each one has a different provision.
-          (provision '(dnsmasq-virbr0))
+          ;; as each one has a different shepherd-provision.
+          (shepherd-provision '(dnsmasq-virbr0))
           (extra-options (list
                           ;; Only bind to the virtual bridge. This
                           ;; avoids conflicts with other running
diff --git a/doc/guix.texi b/doc/guix.texi
index 34092a2f73..ef5aa94d3c 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -36120,9 +36120,14 @@ Data type representing the configuration of dnsmasq.
 @item @code{package} (default: @var{dnsmasq})
 Package object of the dnsmasq server.
 
-@item @code{provision} (default: @code{'(dnsmasq)})
-A list of symbols for the Shepherd service corresponding to this dnsmasq
-configuration.
+@item @code{shepherd-provision} (default: @code{'(dnsmasq)})
+@itemx @code{shepherd-requirement} (default: @code{'(user-processes networking)})
+This option can be used to provide a list of Shepherd service names
+(symbols) provided by this service.  You might want to change the default
+value if you intend to run several @command{dnsmasq} instances.
+
+Likewise, @code{shepherd-requirement} is a list of Shepherd service names
+(symbols) that this service will depend on.
 
 @item @code{no-hosts?} (default: @code{#f})
 When true, don't read the hostnames in /etc/hosts.
diff --git a/gnu/services/dns.scm b/gnu/services/dns.scm
index 05291eb65d..fd849d08e8 100644
--- a/gnu/services/dns.scm
+++ b/gnu/services/dns.scm
@@ -27,6 +27,7 @@
   #:use-module (gnu system shadow)
   #:use-module (gnu packages admin)
   #:use-module (gnu packages dns)
+  #:use-module (guix deprecation)
   #:use-module (guix packages)
   #:use-module (guix records)
   #:use-module (guix gexp)
@@ -742,8 +743,13 @@ cache.size = 100 * MB
   dnsmasq-configuration?
   (package          dnsmasq-configuration-package
                     (default dnsmasq))  ;file-like
-  (provision        dnsmasq-provision
-                    (default '(dnsmasq)))
+  (provision        dnsmasq-configuration-provision ; deprecated
+                    (default #f)
+                    (sanitize warn-deprecated-dnsmasq-configuration-provision))
+  (shepherd-provision           dnsmasq-configuration-shepherd-provision
+                                (default '(dnsmasq)))
+  (shepherd-requirement         dnsmasq-configuration-shepherd-requirement
+                                (default '(user-processes networking)))
   (no-hosts?        dnsmasq-configuration-no-hosts?
                     (default #f))       ;boolean
   (port             dnsmasq-configuration-port
@@ -799,9 +805,19 @@ cache.size = 100 * MB
   (tftp-unique-root dnsmasq-tftp-unique-root
                     (default #f)))      ;"" or "ip" or "mac"
 
+(define (warn-deprecated-dnsmasq-configuration-provision value)
+  (when (pair? value)
+    (warn-about-deprecation
+     'provision #f
+     #:replacement 'shepherd-provision))
+  value)
+
 (define (dnsmasq-shepherd-service config)
   (match-record config <dnsmasq-configuration>
     (package
+     provision
+     shepherd-provision
+     shepherd-requirement
      no-hosts?
      port local-service? listen-addresses
      resolv-file no-resolv?
@@ -815,8 +831,8 @@ cache.size = 100 * MB
      tftp-lowercase? tftp-port-range
      tftp-root tftp-unique-root extra-options)
     (shepherd-service
-     (provision (dnsmasq-provision config))
-     (requirement '(user-processes networking))
+     (provision (or provision shepherd-provision))
+     (requirement shepherd-requirement)
      (documentation "Run the dnsmasq DNS server.")
      (start #~(make-forkexec-constructor
                (list