gluon-core: add ethernet module

package/gluon-core/luasrc/usr/lib/lua/gluon/ethernet.lua

+local util = require 'gluon.util'
+local unistd = require 'posix.unistd'
+local dirent = require 'posix.dirent'
+local uci = require('simple-uci').cursor()
+
+local M = {}
+
+local function has_devtype(iface_dir, devtype)
+	return util.file_contains_line(iface_dir..'/uevent', 'DEVTYPE='..devtype)
+end
+
+local function is_physical(iface_dir)
+	return unistd.access(iface_dir .. '/device') == 0
+end
+
+local function is_swconfig()
+	local has = false
+
+	uci:foreach("system", "switch", function()
+		has = true
+	end)
+
+	uci:foreach("system", "switch_vlan", function()
+		has = true
+	end)
+
+	return has
+end
+
+local function interfaces_raw()
+	local eth_ifaces = {}
+	local ifaces_dir = '/sys/class/net/'
+
+	for iface in dirent.files(ifaces_dir) do
+		if iface ~= '.' and iface ~= '..' then
+			local iface_dir = ifaces_dir .. iface
+			if is_physical(iface_dir) and not has_devtype(iface_dir, 'wlan') then
+				table.insert(eth_ifaces, iface)
+			end
+		end
+	end
+
+	return eth_ifaces
+end
+
+-- In comparison to interfaces_raw, this skips non-DSA ports on DSA devices,
+-- as for ex. hap ac² has a special eth0 that shouldn't be touched
+function M.interfaces()
+	local intfs = interfaces_raw()
+
+	if M.get_switch_type() == 'dsa' then
+		local new_intfs = {}
+		for _, intf in ipairs(intfs) do
+			if has_devtype('/sys/class/net/' .. intf, 'dsa') then
+				table.insert(new_intfs, intf)
+			end
+		end
+
+		return new_intfs
+	end
+
+	return intfs
+end
+
+function M.is_vlan(intf)
+	return has_devtype('/sys/class/net/' .. intf, 'vlan')
+end
+
+function M.get_switch_type()
+	if is_swconfig() then
+		return 'swconfig'
+	end
+
+	for _, intf in ipairs(interfaces_raw()) do
+		if has_devtype('/sys/class/net/' .. intf, 'dsa') then
+			return 'dsa'
+		end
+	end
+
+	return 'none'
+end
+
+return M