VPN plugins are usually split into different packages. It might
be that the plugin file is simply not installed. We want the caller
to be able to recognize that conditation to fail gracefully.
Thus return a certain error code.
Originally, nm-applet loaded the vpn plugins by passing the filename
to g_module_open(). Thereby, g_module_open() allowed for missing file
extension and tries to complete the name with a system-dependent suffix.
When porting to libnm, we kept that behavior but did more elaborate
checks on the file, like checking owner and permissions.
Change to no longer trying to append the system suffix, but require
an exact path. That is no usability problem, because the plugin path
is specified in the .name files, and we just require them now to be the
full path (including the .so extension).
Note also, that this only affects new, libnm-based vpn plugins, thus there
is no change in behavior for legacy libnm-glib based plugins.
Fixes: eed0d0c58f
The localization headers are now included via "nm-default.h".
Also fixes several places, where we wrongly included <glib/gi18n-lib.h>
instead of <glib/gi18n.h>. For example under "clients/" directory.
Split the content of libnm/nm-vpn-editor-plugin.h and
move NMVpnEditorPlugin to libnm-core/nm-vpn-editor-plugin.h.
VPN plugins allow us to extend functionality about VPNs.
This can be also useful for NetworkManager core, hence
move that part to libnm-core.
The name NMVpnEditorPlugin is slightly misleading but not completely
wrong. The "editor" part stands no longer for bringing nm-applet
functionality (alone), but enable general VPN functionality in
the client.
Especially because we already have NMVpnPluginOld with a different
meaning (i.e. a base class of the plugin server implementation).
