services: network-manager: Add 'shepherd-requirement' field.

Note: This also makes wpa-supplicant an optional requirement.

* gnu/services/networking.scm (<network-manager-configuration>)
[shepherd-requirement]: New field.
(network-manager-shepherd-service): Honor it.
(network-manager-configuration-shepherd-requirement): Export accessor.
* doc/guix.texi (Networking Setup): Document it.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 6671ba9305f..ed518cbcb8d 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -19836,6 +19836,12 @@ Data type representing the configuration of NetworkManager.
 @item @code{network-manager} (default: @code{network-manager})
 The NetworkManager package to use.
 
+@item @code{shepherd-requirement} (default: @code{'(wpa-supplicant)})
+This option can be used to provide a list of symbols naming Shepherd services
+that this service will depend on, such as @code{'wpa-supplicant} or
+@code{'iwd} if you require authenticated access for encrypted WiFi or Ethernet
+networks.
+
 @item @code{dns} (default: @code{"default"})
 Processing mode for DNS, which affects how NetworkManager uses the
 @code{resolv.conf} configuration file.