-- Now invoke sysupgrade
local keepcfg = keep_avail and luci.http.formvalue("keepcfg") == "1"
- local flash = ltn12_popen("/sbin/sysupgrade %q" % tmpfile)
+ local flash = ltn12_popen("/sbin/sysupgrade %s %q" %{
+ keepcfg and "" or "-n", tmpfile
+ })
luci.ltn12.pump.all(flash, luci.http.write)
end