diff --git a/libexec/nuageinit/nuage.lua b/libexec/nuageinit/nuage.lua
--- a/libexec/nuageinit/nuage.lua
+++ b/libexec/nuageinit/nuage.lua
@@ -69,7 +69,7 @@
 end
 
 local function chmod(path, mode)
-	local mode = tonumber(mode, 8)
+	mode = tonumber(mode, 8)
 	local _, err, msg = sys_stat.chmod(path, mode)
 	if err then
 		errmsg("chmod(" .. path .. ", " .. mode .. ") failed: " .. msg)
@@ -150,8 +150,6 @@
 end
 
 local function getgroups()
-	local ret = {}
-
 	local root = os.getenv("NUAGE_FAKE_ROOTDIR")
 	local cmd = "pw "
 	if root then
@@ -579,7 +577,7 @@
 		root = "/"
 	end
 
-	f, _, rc = os.execute("tzsetup -s -C " .. root .. " " .. timezone)
+	local f, _, rc = os.execute("tzsetup -s -C " .. root .. " " .. timezone)
 
 	if not f then
 		warnmsg("Impossible to configure time zone ( rc = " .. rc .. " )")
diff --git a/libexec/nuageinit/nuageinit b/libexec/nuageinit/nuageinit
--- a/libexec/nuageinit/nuageinit
+++ b/libexec/nuageinit/nuageinit
@@ -229,10 +229,10 @@
 
 	local resolv_conf = root .. "/etc/resolv.conf"
 
-	resolv_conf_attr = lfs.attributes(resolv_conf)
+	local resolv_conf_attr = lfs.attributes(resolv_conf)
 
 	if resolv_conf_attr == nil then
-		resolv_conf_handler = open_resolv_conf()
+		local resolv_conf_handler = open_resolv_conf()
 		resolv_conf_handler:close()
 	end
 
@@ -295,10 +295,11 @@
 	-- with the matching interfaces must be returned. This changes the way we initially
 	-- thought about our implementation, since at first we only needed one interface,
 	-- but cloud-init performs actions on a group of matching interfaces.
+	local interface
 	local interfaces = {}
 	if rules.macaddress then
 		local ifaces = get_ifaces_by_mac()
-		local interface = ifaces[rules.macaddress]
+		interface = ifaces[rules.macaddress]
 		if not interface then
 			nuage.warn("not interface matching by MAC address: " .. rules.macaddress)
 			return
@@ -348,11 +349,11 @@
 	end
 end
 
-local function write_files_not_defered(obj)
+local function write_files_not_deferred(obj)
 	write_files(obj.write_files, false)
 end
 
-local function write_files_defered(obj)
+local function write_files_deferred(obj)
 	write_files(obj.write_files, true)
 end
 -- Set network configuration from user_data
@@ -381,6 +382,7 @@
 			extra_opts = extra_opts .. " wol"
 		end
 		if v.mtu then
+			local mtu
 			if type(v.mtu) == "number" then
 				mtu = tostring(v.mtu)
 			else
@@ -680,14 +682,14 @@
 		network_config,
 		ssh_pwauth,
 		runcmd,
-		write_files_not_defered,
+		write_files_not_deferred,
 	}
 
 	local post_network_calls = {
 		packages,
 		users,
 		chpasswd,
-		write_files_defered,
+		write_files_deferred,
 	}
 
 	f = io.open(ni_path .. "/" .. ud)
@@ -704,12 +706,8 @@
 
 	for i = 1, #calls_table do
 		if citype == "nocloud" and calls_table[i] == network_config then
-			netobj = parse_network_config()
-			if netobj == nil then
-				network_config(obj)
-			else
-				network_config(netobj)
-			end
+			local netobj = parse_network_config() or obj
+			network_config(netobj)
 		else
 			calls_table[i](obj)
 		end
diff --git a/libexec/nuageinit/tests/addfile.lua b/libexec/nuageinit/tests/addfile.lua
--- a/libexec/nuageinit/tests/addfile.lua
+++ b/libexec/nuageinit/tests/addfile.lua
@@ -35,7 +35,7 @@
 	n.err("Invalid file content")
 end
 
--- the file is overwriten
+-- the file is overwritten
 f.content = "test"
 
 str = addfile_and_getres(f)
diff --git a/libexec/nuageinit/tests/nuageinit.sh b/libexec/nuageinit/tests/nuageinit.sh
--- a/libexec/nuageinit/tests/nuageinit.sh
+++ b/libexec/nuageinit/tests/nuageinit.sh
@@ -890,7 +890,7 @@
 	atf_check -o inline:"plop" cat file1
 	atf_check -o inline:"" cat emptyfile
 	atf_check -o inline:"bla\n" cat file_base64
-	test -f foo && atf_fail "foo creation should have been defered"
+	test -f foo && atf_fail "foo creation should have been deferred"
 	atf_check -o match:"^-rwxr-xr-x.*nobody" ls -l file_base64
 	rm file1 emptyfile file_base64
 	atf_check -o empty /usr/libexec/nuageinit "${PWD}"/media/nuageinit postnet