gluon-config-mode-mesh-vpn: add tunneldigger to reboot page (#1172)

package/gluon-config-mode-mesh-vpn/luasrc/lib/gluon/config-mode/reboot/0100-mesh-vpn.lua

 local uci = require("simple-uci").cursor()
 local lutil = require "gluon.web.util"
+local fs = require "nixio.fs"
 
 local site = require 'gluon.site_config'
 local sysconfig = require 'gluon.sysconfig'
@@ -8,7 +9,10 @@ local util = require "gluon.util"
 local pretty_hostname = require 'pretty_hostname'
 
 
-local meshvpn_enabled = uci:get_bool("fastd", "mesh_vpn", "enabled")
+
+local has_fastd = fs.access('/lib/gluon/mesh-vpn/fastd')
+local has_tunneldigger = fs.access('/lib/gluon/mesh-vpn/tunneldigger')
+
 
 local hostname = pretty_hostname.get(uci)
 local contact = uci:get_first("gluon-node-info", "owner", "contact")
@@ -16,11 +20,20 @@ local contact = uci:get_first("gluon-node-info", "owner", "contact")
 local pubkey
 local msg
 
-if meshvpn_enabled then
-	pubkey = util.trim(lutil.exec("/etc/init.d/fastd show_key mesh_vpn"))
-	msg = _translate('gluon-config-mode:pubkey')
-else
-	msg = _translate('gluon-config-mode:novpn')
+
+if has_tunneldigger then
+	local tunneldigger_enabled = uci:get_bool("tunneldigger", "mesh_vpn", "enabled")
+	if not tunneldigger_enabled then
+		msg = _translate('gluon-config-mode:novpn')
+	end
+elseif has_fastd then
+	local fastd_enabled = uci:get_bool("fastd", "mesh_vpn", "enabled")
+	if fastd_enabled then
+		pubkey = util.trim(lutil.exec("/etc/init.d/fastd show_key mesh_vpn"))
+		msg = _translate('gluon-config-mode:pubkey')
+	else
+		msg = _translate('gluon-config-mode:novpn')
+	end
 end
 
 if not msg then return end