Add new package lua-platform-info

Provides the information given by gluon.model without the dependencies on
gluon-core and LuCi.

For now only for ar71xx-generic, additional targets should be added as needed.

libs/lua-platform-info/Makefile

@@ -0,0 +1,37 @@
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/target.mk
+
+PKG_NAME:=lua-platform-info
+PKG_VERSION:=1
+
+PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/lua-platform-info
+  SECTION:=luci
+  CATEGORY:=LuCi
+  TITLE:=Lua hardware platform information library
+  DEPENDS:=@TARGET_ar71xx_generic
+endef
+
+define Package/lua-platform-info/description
+	Lua library to obtain some generic information about the runtime platform
+endef
+
+define Build/Prepare
+	mkdir -p $(PKG_BUILD_DIR)
+endef
+
+define Build/Configure
+endef
+
+define Build/Compile
+endef
+
+define Package/lua-platform-info/install
+	$(INSTALL_DIR) $(1)/usr/lib/lua
+	$(INSTALL_DATA) ./files/$(BOARD)$(if $(SUBTARGET),/$(SUBTARGET))/platform_info.lua $(1)/usr/lib/lua/
+endef
+
+$(eval $(call BuildPackage,lua-platform-info))

libs/lua-platform-info/files/ar71xx/generic/platform_info.lua

@@ -0,0 +1,32 @@
+local f = io.popen('. /lib/functions.sh; . /lib/ar71xx.sh; ar71xx_board_detect; echo "$AR71XX_BOARD_NAME"; echo "$AR71XX_MODEL"')
+local board_name, model = f:read("*a"):match('([^\n]+)\n([^\n]+)')
+f:close()
+
+
+module 'platform_info'
+
+
+-- The OpenWrt target
+function get_target()
+   return 'ar71xx'
+end
+
+-- The OpenWrt subtarget or nil
+function get_subtarget()
+   return 'generic'
+end
+
+-- The board name
+function get_board_name()
+   return board_name
+end
+
+-- The model name
+function get_model()
+   return model
+end
+
+-- The image name for sysupgrades
+function get_image_name()
+   return (model:lower():gsub('[^%w]+', '-'):gsub('%-+$', ''))
+end