90multipath: install dracut-specific service file

The multipathd package might install a service and a socket
file. Using the original service file from the installed
system without the socket file triggers a bug in systemd,
causing systemd to crash.

As we don't actually need to socket file in the initrd we
should be installing our own service file which does not
reference the socket file at all.

References: bnc#871610

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Thomas Renninger <trenn@suse.de>

modules.d/90multipath/module-setup.sh

@@ -104,10 +104,9 @@ install() {
     fi
 
     if dracut_module_included "systemd"; then
-        inst_multiple \
-            $systemdsystemunitdir/multipathd.service
-        mkdir -p "${initdir}${systemdsystemconfdir}/sysinit.target.wants"
-        ln -rfs "${initdir}${systemdsystemunitdir}/multipathd.service" "${initdir}${systemdsystemconfdir}/sysinit.target.wants/multipathd.service"
+        inst_simple "${moddir}/multipathd.service" "${systemdsystemunitdir}/multipathd.service"
+        mkdir -p "${initdir}${systemdsystemunitdir}/sysinit.target.wants"
+        ln -rfs "${initdir}${systemdsystemunitdir}/multipathd.service" "${initdir}${systemdsystemunitdir}/sysinit.target.wants/multipathd.service"
     else
         inst_hook pre-trigger 02 "$moddir/multipathd.sh"
         inst_hook cleanup   02 "$moddir/multipathd-stop.sh"

modules.d/90multipath/multipathd.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=Device-Mapper Multipath Device Controller
+Before=iscsi.service iscsid.service lvm2-activation-early.service
+DefaultDependencies=no
+Conflicts=shutdown.target
+
+[Service]
+Type=simple
+ExecStartPre=/sbin/modprobe dm-multipath
+ExecStart=/sbin/multipathd -s -d
+ExecReload=/sbin/multipathd reconfigure
+ExecStop=/sbin/multipathd shutdown
+
+[Install]
+WantedBy=sysinit.target