services: dhcp-client: Deprecate 'dhcp-client-service' procedure.

* gnu/services/networking.scm (dhcp-client-service-type): Add default
value.
* gnu/system/examples/bare-bones.tmpl: Use (service
dhcp-client-service-type) instead of (dhcp-client-service).
* gnu/system/examples/beaglebone-black.tmpl: Likewise.
* gnu/tests/base.scm (%avahi-os): Likewise.
* gnu/tests/databases.scm (%memcached-os): Likewise.
(%mongodb-os): Likewise.
* gnu/tests/dict.scm (%dicod-os): Likewise.
* gnu/tests/mail.scm (%opensmtpd-os): Likewise.
(%exim-os): Likewise.
(%dovecot-os): Likewise.
* gnu/tests/messaging.scm (run-xmpp-test): Likewise.
(run-bitlbee-test): Likewise.
* gnu/tests/monitoring.scm (%prometheus-node-exporter-os): Likewise.
* gnu/tests/networking.scm (%inetd-os): Likewise.
(run-iptables-test): Likewise.
* gnu/tests/nfs.scm (%base-os): Likewise.
* gnu/tests/rsync.scm (%rsync-os): Likewise.
* gnu/tests/ssh.scm (run-ssh-test): Likewise.
* gnu/tests/version-control.scm (%cgit-os): Likewise.
(%git-http-os): Likewise.
(%gitolite-os): Likewise.
* gnu/tests/virtualization.scm (%libvirt-os): Likewise.
* gnu/tests/web.scm (%httpd-os): Likewise.
(%nginx-os): Likewise.
(%varnish-os): Likewise.
(%php-fpm-os): Likewise.
(%hpcguix-web-os): Likewise.
(%tailon-os): Likewise.
* tests/guix-system.sh: Likewise.
* doc/guix.texi (Networking Services): Document
'dhcp-client-service-type' and remove 'dhcp-client-service'.

doc/guix.texi

@@ -11546,10 +11546,11 @@ The @code{(gnu services networking)} module provides services to configure
 the network interface.
 
 @cindex DHCP, networking service
-@deffn {Scheme Procedure} dhcp-client-service [#:dhcp @var{isc-dhcp}]
+@defvr {Scheme Variable} dhcp-client-service-type
-Return a service that runs @var{dhcp}, a Dynamic Host Configuration
+This is the type of services that run @var{dhcp}, a Dynamic Host Configuration
-Protocol (DHCP) client, on all the non-loopback network interfaces.
+Protocol (DHCP) client, on all the non-loopback network interfaces.  Its value
-@end deffn
+is the DHCP client package to use, @code{isc-dhcp} by default.
+@end defvr
 
 @deffn {Scheme Procedure} dhcpd-service-type
 This type defines a service that runs a DHCP daemon.  To create a
@@ -17168,7 +17169,7 @@ A helper function to quickly add php to an @code{nginx-server-configuration}.
 
 A simple services setup for nginx with php can look like this:
 @example
-(services (cons* (dhcp-client-service)
+(services (cons* (service dhcp-client-service-type)
                  (service php-fpm-service-type)
                  (service nginx-service-type
                           (nginx-server-configuration

gnu/services/networking.scm

@@ -53,6 +53,7 @@
                static-networking-service-type)
   #:export (%facebook-host-aliases
             dhcp-client-service
+            dhcp-client-service-type
 
             dhcpd-service-type
             dhcpd-configuration
@@ -202,9 +203,10 @@ fe80::1%lo0 apps.facebook.com\n")
                                     "-pf" #$pid-file ifaces))))
                    (and (zero? (cdr (waitpid pid)))
                         (read-pid-file #$pid-file)))))
-      (stop #~(make-kill-destructor))))))
+      (stop #~(make-kill-destructor))))
+   isc-dhcp))
 
-(define* (dhcp-client-service #:key (dhcp isc-dhcp))
+(define* (dhcp-client-service #:key (dhcp isc-dhcp)) ;deprecated
   "Return a service that runs @var{dhcp}, a Dynamic Host Configuration
 Protocol (DHCP) client, on all the non-loopback network interfaces."
   (service dhcp-client-service-type dhcp))

gnu/system/examples/bare-bones.tmpl

@@ -44,7 +44,7 @@
 
   ;; Add services to the baseline: a DHCP client and
   ;; an SSH server.
-  (services (cons* (dhcp-client-service)
+  (services (cons* (service dhcp-client-service-type)
                    (service openssh-service-type
                             (openssh-configuration
                               (port-number 2222)))

gnu/system/examples/beaglebone-black.tmpl

@@ -45,7 +45,7 @@
   ;; Globally-installed packages.
   (packages (cons* screen openssh %base-packages))
 
-  (services (cons* (dhcp-client-service)
+  (services (cons* (service dhcp-client-service-type)
                    ;; mingetty does not work on serial lines.
                    ;; Use agetty with board-specific serial parameters.
                    (agetty-service

gnu/tests/base.scm

@@ -673,7 +673,7 @@ non-ASCII names from /tmp.")
     (name-service-switch %mdns-host-lookup-nss)
     (services (cons* (avahi-service #:debug? #t)
                      (dbus-service)
-                     (dhcp-client-service)        ;needed for multicast
+                     (service dhcp-client-service-type) ;needed for multicast
 
                      ;; Enable heavyweight debugging output.
                      (modify-services (operating-system-user-services

gnu/tests/databases.scm

@@ -35,7 +35,7 @@
 
 (define %memcached-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service memcached-service-type)))
 
 (define* (run-memcached-test #:optional (port 11211))
@@ -130,7 +130,7 @@
   (operating-system
     (inherit
      (simple-operating-system
-      (dhcp-client-service)
+      (service dhcp-client-service-type)
       (service mongodb-service-type)))
     (packages (cons* mongodb
                      %base-packages))))

gnu/tests/dict.scm

@@ -34,7 +34,7 @@
 
 (define %dicod-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service dicod-service-type
             (dicod-configuration
              (interfaces '("0.0.0.0"))

gnu/tests/mail.scm

@@ -36,7 +36,7 @@
 
 (define %opensmtpd-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service opensmtpd-service-type
             (opensmtpd-configuration
              (config-file
@@ -155,7 +155,7 @@ accept from any for local deliver to mbox
 
 (define %exim-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service mail-aliases-service-type '())
    (service exim-service-type
             (exim-configuration
@@ -283,7 +283,7 @@ acl_check_data:
 
 (define %dovecot-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (dovecot-service #:config
                     (dovecot-configuration
                      (disable-plaintext-auth? #f)

gnu/tests/messaging.scm

@@ -35,7 +35,7 @@
   "Run a test of an OS running XMPP-SERVICE, which writes its PID to PID-FILE."
   (define os
     (marionette-operating-system
-     (simple-operating-system (dhcp-client-service)
+     (simple-operating-system (service dhcp-client-service-type)
                               xmpp-service)
      #:imported-modules '((gnu services herd))))
 
@@ -167,7 +167,7 @@
 (define (run-bitlbee-test)
   (define os
     (marionette-operating-system
-     (simple-operating-system (dhcp-client-service)
+     (simple-operating-system (service dhcp-client-service-type)
                               (service bitlbee-service-type
                                        (bitlbee-configuration
                                         (interface "0.0.0.0"))))

gnu/tests/monitoring.scm

@@ -85,7 +85,7 @@
 
 (define %prometheus-node-exporter-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service prometheus-node-exporter-service-type
             (prometheus-node-exporter-configuration))))
 

gnu/tests/networking.scm

@@ -39,7 +39,7 @@
 (define %inetd-os
   ;; Operating system with 2 inetd services.
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service inetd-service-type
             (inetd-configuration
              (entries (list
@@ -463,7 +463,7 @@ COMMIT
   (define os
     (marionette-operating-system
      (simple-operating-system
-      (dhcp-client-service)
+      (service dhcp-client-service-type)
       (service inetd-service-type
                (inetd-configuration
                 (entries (list

gnu/tests/nfs.scm

@@ -55,7 +55,7 @@
     (services (cons*
                (service rpcbind-service-type
                         (rpcbind-configuration))
-               (dhcp-client-service)
+               (service dhcp-client-service-type)
                %base-services))))
 
 (define (run-nfs-test name socket)

gnu/tests/rsync.scm

@@ -111,7 +111,7 @@ PORT."
   ;; Return operating system under test.
   (let ((base-os
          (simple-operating-system
-          (dhcp-client-service)
+          (service dhcp-client-service-type)
           (service rsync-service-type))))
     (operating-system
       (inherit base-os)

gnu/tests/ssh.scm

@@ -39,7 +39,7 @@ empty-password logins.
 When SFTP? is true, run an SFTP server test."
   (define os
     (marionette-operating-system
-     (simple-operating-system (dhcp-client-service) ssh-service)
+     (simple-operating-system (service dhcp-client-service-type) ssh-service)
      #:imported-modules '((gnu services herd)
                           (guix combinators))))
   (define vm

gnu/tests/version-control.scm

@@ -92,7 +92,7 @@
   ;; Operating system under test.
   (let ((base-os
          (simple-operating-system
-          (dhcp-client-service)
+          (service dhcp-client-service-type)
           (service cgit-service-type
                    (cgit-configuration
                     (nginx %cgit-configuration-nginx)))
@@ -237,7 +237,7 @@ HTTP-PORT."
 
 (define %git-http-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service fcgiwrap-service-type)
    (service nginx-service-type %git-nginx-configuration)
    %test-repository-service))
@@ -328,7 +328,7 @@ HTTP-PORT."
 
 (define %gitolite-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service openssh-service-type)
    (service gitolite-service-type
             (gitolite-configuration

gnu/tests/virtualization.scm

@@ -32,7 +32,7 @@
 
 (define %libvirt-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (dbus-service)
    (polkit-service)
    (service libvirt-service-type)))

gnu/tests/web.scm

@@ -125,7 +125,7 @@ HTTP-PORT."
 
 (define %httpd-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service httpd-service-type
             (httpd-configuration
              (config
@@ -154,7 +154,7 @@ HTTP-PORT."
 (define %nginx-os
   ;; Operating system under test.
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service nginx-service-type
             (nginx-configuration
              (log-directory "/var/log/nginx")
@@ -188,7 +188,7 @@ sub vcl_synth {
 
 (define %varnish-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    ;; Pretend to be a web server that serves %index.html-contents.
    (service varnish-service-type
             (varnish-configuration
@@ -237,7 +237,7 @@ echo(\"Computed by php:\".((string)(2+3)));
 (define %php-fpm-os
   ;; Operating system under test.
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service php-fpm-service-type)
    (service nginx-service-type
             (nginx-configuration
@@ -392,7 +392,7 @@ HTTP-PORT, along with php-fpm."
 
 (define %hpcguix-web-os
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service hpcguix-web-service-type
             (hpcguix-web-configuration
              (specs %hpcguix-web-specs)))))
@@ -407,7 +407,7 @@ HTTP-PORT, along with php-fpm."
 (define %tailon-os
   ;; Operating system under test.
   (simple-operating-system
-   (dhcp-client-service)
+   (service dhcp-client-service-type)
    (service tailon-service-type
             (tailon-configuration
              (config-file

guix/gexp.scm

@@ -438,6 +438,14 @@ This is the declarative counterpart of 'gexp->file'."
   (base   file-append-base)                    ;<package> | <derivation> | ...
   (suffix file-append-suffix))                 ;list of strings
 
+(define (write-file-append file port)
+  (match file
+    (($ <file-append> base suffix)
+     (format port "#<file-append ~s ~s>" base
+             (string-join suffix)))))
+
+(set-record-type-printer! <file-append> write-file-append)
+
 (define (file-append base . suffix)
   "Return a <file-append> object that expands to the concatenation of BASE and
 SUFFIX."

tests/guix-system.sh

@@ -153,8 +153,8 @@ cat > "$tmpfile" <<EOF
 
 (operating-system
   $OS_BASE
-  (services (cons* (dhcp-client-service)
+  (services (cons* (service dhcp-client-service-type)
-                   (dhcp-client-service) ;twice!
+                   (service dhcp-client-service-type) ;twice!
                    %base-services)))
 EOF