system: Add bindings to configure libc's NSS.

* gnu/system/nss.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu.scm (%public-modules): Add it.
* gnu/system.scm (<operating-system>)[name-service-switch]: New field.
  (etc-directory): Add #:nss parameter and honor it.
  (operating-system-etc-directory): Adjust call accordingly.
* doc/guix.texi (operating-system Reference): Document
  'name-service-switch'.
  (Name Service Switch): New section.

1 files changed, 2 insertions, 1 deletions

diff --git a/gnu.scm b/gnu.scm
index d9b9117b8ad..e3147b39e38 100644
--- a/gnu.scm
+++ b/gnu.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014, 2015 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2015 Joshua S. Grant <jgrant@parenthetical.io>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -37,6 +37,7 @@
         (gnu system linux)                        ; 'base-pam-services'
         (gnu system shadow)                       ; 'user-account'
         (gnu system linux-initrd)
+        (gnu system nss)
         (gnu services)
         (gnu services base)
         (gnu packages)