package/swupdate: add option to enable USB install

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
[yann.morin.1998@free.fr:
  - do not default to 'y'
  - add comment
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/swupdate/Config.in

@@ -60,6 +60,15 @@ config BR2_PACKAGE_SWUPDATE_CONFIG
 	  I you wish to use your own modified swupdate configuration
 	  file specify the config file location with this option.
 
+config BR2_PACKAGE_SWUPDATE_USB
+	bool "swupdate usb"
+	depends on BR2_PACKAGE_SYSTEMD
+	help
+	  Enable update from USB disk.
+
+comment "swupdate usb needs systemd"
+	depends on !BR2_PACKAGE_SYSTEMD
+
 config BR2_PACKAGE_SWUPDATE_WEBSERVER
 	bool "swupdate webserver"
 	default y

package/swupdate/swupdate-usb.rules

@@ -0,0 +1 @@
+ACTION=="add", KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_BUS}=="usb", ENV{ID_FS_USAGE}=="filesystem", TAG+="systemd", ENV{SYSTEMD_WANTS}+="swupdate-usb@%k.service"

package/swupdate/swupdate.mk

@@ -252,6 +252,9 @@ define SWUPDATE_INSTALL_INIT_SYSTEMD
 		$(TARGET_DIR)/usr/lib/systemd/system/swupdate.socket
 	$(INSTALL) -D -m 644 $(SWUPDATE_PKGDIR)/swupdate-usb@.service \
 		$(TARGET_DIR)/usr/lib/systemd/system/swupdate-usb@.service
+	$(if $(BR2_PACKAGE_SWUPDATE_USB), \
+		$(INSTALL) -D -m 644 $(SWUPDATE_PKGDIR)/swupdate-usb.rules \
+			$(TARGET_DIR)/lib/udev/rules.d/swupdate-usb.rules)
 	$(INSTALL) -D -m 644 $(SWUPDATE_PKGDIR)/swupdate-progress.service \
 		$(TARGET_DIR)/usr/lib/systemd/system/swupdate-progress.service
 	$(INSTALL) -D -m 644 $(SWUPDATE_PKGDIR)/tmpfiles-swupdate.conf \