pulseaudio: systemd support

[Thomas:
 - use relative path for the service symlink
 - slightly adjust the service description]

Signed-off-by: Alex Suykov <alex.suykov@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/pulseaudio/pulseaudio.mk

@@ -123,6 +123,14 @@ define PULSEAUDIO_INSTALL_INIT_SYSV
 		$(TARGET_DIR)/etc/init.d/S50pulseaudio
 endef
 
+define PULSEAUDIO_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 644 package/pulseaudio/pulseaudio.service \
+		$(TARGET_DIR)/usr/lib/systemd/system/pulseaudio.service
+	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
+	ln -sf ../../../../usr/lib/systemd/system/pulseaudio.service \
+		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/pulseaudio.service
+endef
+
 endif
 
 $(eval $(autotools-package))

package/pulseaudio/pulseaudio.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=PulseAudio Sound System
+After=syslog.target
+
+[Service]
+UMask=077
+ExecStart=/usr/bin/pulseaudio --system --daemonize=no
+Restart=always
+
+[Install]
+WantedBy=multi-user.target