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gluon-wan-dnsmasq: don't rewrite resolv.conf when its content hasn't changed

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This avoids poking dnsmasq every time a DHCP lease is obtained or a router
advertisement received.
This commit is contained in:
Matthias Schiffer 2015-02-18 01:23:11 +01:00
parent 9f4770fd62
commit 112c9d5c9d
2 changed files with 23 additions and 12 deletions
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31
package/gluon-wan-dnsmasq/files/lib/gluon/wan-dnsmasq/update.lua
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@ -9,27 +9,38 @@ local uci = require('luci.model.uci').cursor()
local fs = require 'nixio.fs'
local function write_servers(f, servers)
local new_servers = ''
local function append_servers(servers)
for _, server in ipairs(servers) do
f:write('nameserver ', server, '\n')
new_servers = new_servers .. 'nameserver ' .. server .. '\n'
end
end
local function write_interface_servers(f, iface)
write_servers(f, ubus:call('network.interface.' .. iface, 'status', {}).inactive['dns-server'])
local function append_interface_servers(iface)
append_servers(ubus:call('network.interface.' .. iface, 'status', {}).inactive['dns-server'])
end
fs.mkdirr(RESOLV_CONF_DIR)
local f = io.open(RESOLV_CONF, 'w+')
local static = uci:get_first('gluon-wan-dnsmasq', 'static', 'server')
if type(static) == 'table' and #static > 0 then
write_servers(f, static)
append_servers(static)
else
pcall(write_interface_servers, f, 'wan6')
pcall(write_interface_servers, f, 'wan')
pcall(append_interface_servers, 'wan6')
pcall(append_interface_servers, 'wan')
end
fs.mkdirr(RESOLV_CONF_DIR)
local old_servers = fs.readfile(RESOLV_CONF)
if new_servers ~= old_servers then
local f = io.open(RESOLV_CONF .. '.tmp', 'w')
f:write(new_servers)
f:close()
fs.rename(RESOLV_CONF .. '.tmp', RESOLV_CONF)
end