guix system: 'docker-image' honors '--network'.

* gnu/system/vm.scm (system-docker-image): Add #:shared-network? and
pass it to 'containerized-operating-system'.
(qemu-image):
* guix/scripts/system.scm (system-derivation-for-action): Pass
 #:shared-network? to 'system-docker-image'.
* doc/guix.texi (Invoking guix system): Document it.

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 6893a914dc..f8e137817c 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -27066,6 +27066,10 @@ example, if you intend to build software using Guix inside of the Docker
 container, you may need to pass the @option{--privileged} option to
 @code{docker create}.
 
+Last, the @code{--network} option applies to @command{guix system
+docker-image}: it produces an image where network is supposedly shared
+with the host, and thus without services like nscd or NetworkManager.
+
 @item container
 Return a script to run the operating system declared in @var{file}
 within a container.  Containers are a set of lightweight isolation