doc: Add new Swap Space section.

* doc/guix.texi (operating-system Reference): Update swap-devices.
* doc/guix.texi (Swap Space): Add it.
* gnu/system/examples/desktop.tmpl: Add swap-devices example.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/gnu/system/examples/desktop.tmpl b/gnu/system/examples/desktop.tmpl
index c928008c925..6df53844b1a 100644
--- a/gnu/system/examples/desktop.tmpl
+++ b/gnu/system/examples/desktop.tmpl
@@ -1,6 +1,6 @@
 ;; This is an operating system configuration template
 ;; for a "desktop" setup with GNOME and Xfce where the
-;; root partition is encrypted with LUKS.
+;; root partition is encrypted with LUKS, and a swap file.
 
 (use-modules (gnu) (gnu system nss))
 (use-service-modules desktop xorg)
@@ -42,6 +42,11 @@
                          (type "vfat")))
                  %base-file-systems))
 
+  ;; Specify a swap file for the system, which resides on the
+  ;; root file system.
+  (swap-devices (list (swap-space
+                       (target "/swapfile"))))
+
   ;; Create user `bob' with `alice' as its initial password.
   (users (cons (user-account
                 (name "bob")