services: 'service-parameters' becomes 'service-value'.

* gnu/services.scm (<service>)[parameters]: Rename to...
[value]: ... this.
Change calls to 'service-parameters' to 'service-value'.
* gnu/system.scm, gnu/tests/base.scm,
guix/scripts/system.scm, tests/services.scm: Likewise.
* doc/guix.texi (Service Reference): Adjust accordingly.

3 files changed, 18 insertions, 13 deletions

diff --git a/gnu/services.scm b/gnu/services.scm
index 9f6e323e18..af4cffe819 100644
--- a/gnu/services.scm
+++ b/gnu/services.scm
@@ -51,7 +51,8 @@
             service
             service?
             service-kind
-            service-parameters
+            service-value
+            service-parameters                    ;deprecated
 
             simple-service
             modify-services
@@ -142,10 +143,14 @@
 
 ;; Services of a given type.
 (define-record-type <service>
-  (service type parameters)
+  (service type value)
   service?
   (type       service-kind)
-  (parameters service-parameters))
+  (value      service-value))
+
+(define service-parameters
+  ;; Deprecated alias.
+  service-value)
 
 (define (simple-service name target value)
   "Return a service that extends TARGET with VALUE.  This works by creating a
@@ -161,7 +166,7 @@ singleton service type NAME, of which the returned service is an instance."
      service)
     ((_ svc (kind param => exp ...) clauses ...)
      (if (eq? (service-kind svc) kind)
-         (let ((param (service-parameters svc)))
+         (let ((param (service-value svc)))
            (service (service-kind svc)
                     (begin exp ...)))
          (%modify-service svc clauses ...)))))
@@ -321,7 +326,7 @@ file."
 (define* (activation-service->script service)
   "Return as a monadic value the activation script for SERVICE, a service of
 ACTIVATION-SCRIPT-TYPE."
-  (activation-script (service-parameters service)))
+  (activation-script (service-value service)))
 
 (define (activation-script gexps)
   "Return the system's activation script, which evaluates GEXPS."
@@ -432,7 +437,7 @@ and FILE could be \"/usr/bin/env\"."
 
 (define (etc-directory service)
   "Return the directory for SERVICE, a service of type ETC-SERVICE-TYPE."
-  (files->etc-directory (service-parameters service)))
+  (files->etc-directory (service-value service)))
 
 (define (files->etc-directory files)
   (file-union "etc" files))
@@ -605,7 +610,7 @@ TARGET-TYPE; return the root service adjusted accordingly."
       (match (find (matching-extension target)
                    (service-type-extensions (service-kind service)))
         (($ <service-extension> _ compute)
-         (compute (service-parameters service))))))
+         (compute (service-value service))))))
 
   (match (filter (lambda (service)
                    (eq? (service-kind service) target-type))
@@ -616,7 +621,7 @@ TARGET-TYPE; return the root service adjusted accordingly."
               (extensions (map (apply-extension sink) dependents))
               (extend     (service-type-extend (service-kind sink)))
               (compose    (service-type-compose (service-kind sink)))
-              (params     (service-parameters sink)))
+              (params     (service-value sink)))
          ;; We distinguish COMPOSE and EXTEND because PARAMS typically has a
          ;; different type than the elements of EXTENSIONS.
          (if extend
diff --git a/gnu/system.scm b/gnu/system.scm
index 69cbc8a081..89c4150f99 100644
--- a/gnu/system.scm
+++ b/gnu/system.scm
@@ -615,7 +615,7 @@ hardware-related operations as necessary when booting a Linux container."
   (let* ((services (operating-system-services os #:container? container?))
          (boot     (fold-services services #:target-type boot-service-type)))
     ;; BOOT is the script as a monadic value.
-    (service-parameters boot)))
+    (service-value boot)))
 
 (define (operating-system-user-accounts os)
   "Return the list of user accounts of OS."
@@ -623,12 +623,12 @@ hardware-related operations as necessary when booting a Linux container."
          (account  (fold-services services
                                   #:target-type account-service-type)))
     (filter user-account?
-            (service-parameters account))))
+            (service-value account))))
 
 (define (operating-system-shepherd-service-names os)
   "Return the list of Shepherd service names for OS."
   (append-map shepherd-service-provision
-              (service-parameters
+              (service-value
                (fold-services (operating-system-services os)
                               #:target-type
                               shepherd-root-service-type))))
@@ -638,7 +638,7 @@ hardware-related operations as necessary when booting a Linux container."
   (let* ((services (operating-system-services os #:container? container?))
          (system   (fold-services services)))
     ;; SYSTEM contains the derivation as a monadic value.
-    (service-parameters system)))
+    (service-value system)))
 
 (define* (operating-system-profile os #:key container?)
   "Return a derivation that builds the system profile of OS."
diff --git a/gnu/tests/base.scm b/gnu/tests/base.scm
index bcb8299c73..6ce5ab3de1 100644
--- a/gnu/tests/base.scm
+++ b/gnu/tests/base.scm
@@ -56,7 +56,7 @@ passed a gexp denoting the marionette, and it must return gexp that is
 inserted before the first test.  This is used to introduce an extra
 initialization step, such as entering a LUKS passphrase."
   (define special-files
-    (service-parameters
+    (service-value
      (fold-services (operating-system-services os)
                     #:target-type special-files-service-type)))