services: Rewrite using gexps.

* gnu/services.scm (<service>)[inputs]: Remove.
* gnu/system.scm (links): Remove.
  (etc-directory): Add PASSWD and SHADOW to #:inputs.
  (operating-system-boot-script): Pass ETC to 'dmd-configuration-file'.
  (operating-system-derivation): Remove EXTRAS from the union.
* gnu/system/linux.scm (pam-service->configuration): Rewrite in terms of
  'gexp->derivation'.  Compute the contents on the build side.  Expect
  'arguments' to contain a list of gexps.
  (pam-services->directory): Rewrite in terms of 'gexp->derivation'.
  (unix-pam-service): Change 'arguments' to a list of one gexp.
* gnu/system/shadow.scm (<user-account>)[inputs]: Remove.
  [shell]: Change default value to a gexp.
  (passwd-file): Rewrite in terms of 'gexp->derivation'.  Compute
  contents on the build side.
* gnu/services/base.scm (host-name-service, mingetty-service,
  nscd-service, syslog-service, guix-service): Change 'start' and 'stop'
  to gexps; remove 'inputs' field.
  (guix-build-accounts): Change 'shell' field to a gexp.
* gnu/services/networking.scm (static-networking-service): Change
  'start' and 'stop' to gexps; remove 'inputs' field.
* gnu/services/xorg.scm (slim-service): Likewise.
* gnu/services/dmd.scm (dmd-configuration-file): Expect ETC to be a
  derivation.  Change 'config' to a gexp.  Use 'gexp->file' instead of
  'text-file'.
* doc/guix.texi (Defining Services): Update nscd example with gexps, and
  without 'inputs'.  Add xref to "G-Expressions".

1 files changed, 2 insertions, 5 deletions

diff --git a/gnu/services.scm b/gnu/services.scm
index eccde4e9a3..8b89b11b8f 100644
--- a/gnu/services.scm
+++ b/gnu/services.scm
@@ -26,7 +26,6 @@
             service-respawn?
             service-start
             service-stop
-            service-inputs
             service-user-accounts
             service-user-groups
             service-pam-services))
@@ -47,11 +46,9 @@
                  (default '()))
   (respawn?      service-respawn?                 ; Boolean
                  (default #t))
-  (start         service-start)                   ; expression
-  (stop          service-stop                     ; expression
+  (start         service-start)                   ; g-expression
+  (stop          service-stop                     ; g-expression
                  (default #f))
-  (inputs        service-inputs                   ; list of inputs
-                 (default '()))
   (user-accounts service-user-accounts            ; list of <user-account>
                  (default '()))
   (user-groups   service-user-groups              ; list of <user-groups>