Fix connection to wifi APs from user menu (RH #1628263)

In recent Fedora 29, connecting to wifi access points from the
user menu (top-right menu) does not work. Clicking the 'Connect'
button just animates it but does nothing else. The logs show an
error "JS ERROR: Error: Expected type utf8 for Argument
'specific_object' but got type 'undefined'".

Looking into this, it seems the problem is these uses of the
`path` property of an NMAccessPoint. NMAccessPoint inherits
from NMObject, and NMObject *does* have a path property:

https://developer.gnome.org/libnm/stable/NMObject.html#NMObject--path

so at first glance this seems fine. But I poked around a bit
using libnm via Python (which goes via introspection, just like
this JS code does), and found that indeed AccessPoint objects
don't seem to have a `path` property there either.

Looking at the libnm code, this actually makes sense, because
the property is marked "(skip)":

https://github.com/NetworkManager/NetworkManager/blob/master/libnm/nm-object.c#L1291

and the introspection docs suggest that means it should be left
out of introspected output:

https://wiki.gnome.org/Projects/GObjectIntrospection/Annotations#Symbol_visibility

I'm a bit concerned that this was only found recently - whereas
the change to use `.path` in gnome-shell dates from October 2017
(d71af5e5) and the property has been marked (skip) in NM since
at least 2016 - but this all seems to add up. The obvious fix is
to replace use of `.path` with `.get_path()`, which returns the
path and is *not* marked (skip) and so *is* available via
introspection. I tested that this works in Python and also did
a test build of gnome-shell with this change and installed it on
an affected system, it does seem to fix the bug.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

diff --git a/js/ui/status/network.js b/js/ui/status/network.js
index b575a726d9755b11c0f208d283842f76fef3639b..d5567dc3c2a443cd693fcd46896ee98eebe83c88 100644 (file)
--- a/js/ui/status/network.js
+++ b/js/ui/status/network.js
@@ -921,10 +921,10 @@ var NMWirelessDialog = new Lang.Class({
                 // 802.1x-enabled APs require further configuration, so they're
                 // handled in gnome-control-center
                 Util.spawn(['gnome-control-center', 'wifi', 'connect-8021x-wifi',
-                            this._device.get_path(), accessPoints[0].path]);
+                            this._device.get_path(), accessPoints[0].get_path()]);
             } else {
                 let connection = new NM.SimpleConnection();
-                this._client.add_and_activate_connection_async(connection, this._device, accessPoints[0].path, null, null)
+                this._client.add_and_activate_connection_async(connection, this._device, accessPoints[0].get_path(), null, null)
             }
         }