NIU: Backup system settings

modules/niu/luasrc/controller/niu/system.lua

@@ -12,7 +12,7 @@ You may obtain a copy of the License at
 $Id$
 ]]--
 
-local req = require
+local require, pairs, unpack = require, pairs, unpack
 module "luci.controller.niu.system"
 
 function index()
@@ -20,4 +20,48 @@ function index()
 
 	entry({"niu", "system", "general"}, 
 	cbi("niu/system/general", {on_success_to={"niu"}}), "General", 10)
+	
+	entry({"niu", "system", "backup"}, call("backup"), "Backup Settings", 20)
+end
+
+function backup()
+	local os = require "os"
+	local uci = require "luci.model.uci".cursor()
+	local nixio, nutl = require "nixio", require "nixio.util"
+	local fs = require "nixio.fs"
+	local http = require "luci.http"
+	
+	
+	local call = {"/bin/tar", "-cz"}
+	for k, v in pairs(uci:get_all("luci", "flash_keep")) do
+		if k:byte() ~= 46 then	-- k[1] ~= "."
+			nutl.consume(fs.glob(v), call)
+		end
+	end
+	
+	
+	http.header(
+		'Content-Disposition', 'attachment; filename="backup-%s-%s.tar.gz"' % {
+			nixio.uname().nodename, os.date("%Y-%m-%d")
+		}
+	)
+	http.prepare_content("application/x-targz")
+	
+	
+	local fdin, fdout = nixio.pipe()
+	local devnull = nixio.open("/dev/null", "r+")
+	local proc = nixio.fork()
+	
+	if proc == 0 then
+		fdin:close()
+		nixio.dup(devnull, nixio.stdin)
+		nixio.dup(devnull, nixio.stderr)
+		nixio.dup(fdout, nixio.stdout)
+		nixio.exec(unpack(call))
+		os.exit(1)
+	end
+	
+	fdout:close()
+	http.splice(fdin)
+	http.close()
 end