Prevent ssu startup when system is shutting down.

[systemd] Prevent ssu startup when system is shutting down. Contributes to JB#24120

We need to map the dbus service file to systemd service file in order to
be able to prevent dbus activation of the service when system is for
example shutting down.
Signed-off-by: Marko Saukko <marko.saukko@jolla.com>

dbus/org.nemo.ssu.service

 [D-BUS Service]
 Interface=org.nemo.ssu
 Name=org.nemo.ssu
-Exec=/usr/bin/ssud
-User=root
\ No newline at end of file
+Exec=/bin/false
+User=root
+SystemdService=dbus-org.nemo.ssu.service
+

rpm/ssu.spec

@@ -36,6 +36,7 @@ Requires: ssu-network-proxy
 # them for the vendor data packages to use
 %attr(0755, -, -) %{_oneshotdir}/*
 %{_bindir}/ssud
+/lib/systemd/system/*.service
 %{_datadir}/dbus-1/system-services/*.service
 %{_sysconfdir}/dbus-1/system.d/*.conf
 

ssud/ssud.pro

@@ -13,10 +13,13 @@ SOURCES = ssuadaptor.cpp \
 
 DBUS_SERVICE_NAME=org.nemo.ssu
 
+systemd.files = ../systemd/dbus-$${DBUS_SERVICE_NAME}.service
+systemd.path = /lib/systemd/system/
+
 service.files = ../dbus/$${DBUS_SERVICE_NAME}.service
 service.path = /usr/share/dbus-1/system-services/
 
 conf.files = ../dbus/$${DBUS_SERVICE_NAME}.conf
 conf.path = /etc/dbus-1/system.d/
 
-INSTALLS += service conf
+INSTALLS += systemd service conf

systemd/dbus-org.nemo.ssu.service

+[Unit]
+Description=SSU service
+
+[Service]
+Type=dbus
+BusName=org.nemo.ssu
+ExecStart=/usr/bin/ssud
+