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-- Copyright 2008 Steven Barth <steven@midlink.org>
-- Licensed to the public under the Apache License 2.0.
local os = require "os"
local uci = require "uci"
local util = require "luci.util"
local table = require "table"
local setmetatable, rawget, rawset = setmetatable, rawget, rawset
local require, getmetatable = require, getmetatable
local error, pairs, ipairs = error, pairs, ipairs
local type, tostring, tonumber, unpack = type, tostring, tonumber, unpack
-- The typical workflow for UCI is: Get a cursor instance from the
-- cursor factory, modify data (via Cursor.add, Cursor.delete, etc.),
-- save the changes to the staging area via Cursor.save and finally
-- Cursor.commit the data to the actual config files.
-- LuCI then needs to Cursor.apply the changes so deamons etc. are
-- reloaded.
module "luci.model.uci"
cursor = uci.cursor
APIVERSION = uci.APIVERSION
function cursor_state()
return cursor(nil, "/var/state")
end
inst = cursor()
inst_state = cursor_state()
local Cursor = getmetatable(inst)
function Cursor.apply(self, configlist, command)
configlist = self:_affected(configlist)
if command then
return { "/sbin/luci-reload", unpack(configlist) }
else
return os.execute("/sbin/luci-reload %s >/dev/null 2>&1"
% table.concat(configlist, " "))
end
end
-- returns a boolean whether to delete the current section (optional)
function Cursor.delete_all(self, config, stype, comparator)
local del = {}
if type(comparator) == "table" then
local tbl = comparator
comparator = function(section)
for k, v in pairs(tbl) do
if section[k] ~= v then
return false
end
end
return true
end
end
local function helper (section)
if not comparator or comparator(section) then
del[#del+1] = section[".name"]
end
end
self:foreach(config, stype, helper)
for i, j in ipairs(del) do
self:delete(config, j)
end
end
function Cursor.section(self, config, type, name, values)
local stat = true
if name then
stat = self:set(config, name, type)
else
name = self:add(config, type)
stat = name and true
end
if stat and values then
stat = self:tset(config, name, values)
end
return stat and name
end
function Cursor.tset(self, config, section, values)
local stat = true
for k, v in pairs(values) do
if k:sub(1, 1) ~= "." then
stat = stat and self:set(config, section, k, v)
end
end
return stat
end
function Cursor.get_bool(self, ...)
local val = self:get(...)
return ( val == "1" or val == "true" or val == "yes" or val == "on" )
end
function Cursor.get_list(self, config, section, option)
if config and section and option then
local val = self:get(config, section, option)
return ( type(val) == "table" and val or { val } )
end
return {}
end
function Cursor.get_first(self, conf, stype, opt, def)
local rv = def
self:foreach(conf, stype,
function(s)
local val = not opt and s['.name'] or s[opt]
if type(def) == "number" then
val = tonumber(val)
elseif type(def) == "boolean" then
val = (val == "1" or val == "true" or
val == "yes" or val == "on")
end
if val ~= nil then
rv = val
return false
end
end)
return rv
end
function Cursor.set_list(self, config, section, option, value)
if config and section and option then
if not value or #value == 0 then
return self:delete(config, section, option)
end
return self:set(
config, section, option,
( type(value) == "table" and value or { value } )
)
end
return false
end
-- Return a list of initscripts affected by configuration changes.
function Cursor._affected(self, configlist)
configlist = type(configlist) == "table" and configlist or {configlist}
local c = cursor()
c:load("ucitrack")
-- Resolve dependencies
local reloadlist = {}
local function _resolve_deps(name)
local reload = {name}
local deps = {}
c:foreach("ucitrack", name,
function(section)
if section.affects then
for i, aff in ipairs(section.affects) do
deps[#deps+1] = aff
end
end
end)
for i, dep in ipairs(deps) do
for j, add in ipairs(_resolve_deps(dep)) do
reload[#reload+1] = add
end
end
return reload
end
-- Collect initscripts
for j, config in ipairs(configlist) do
for i, e in ipairs(_resolve_deps(config)) do
if not util.contains(reloadlist, e) then
reloadlist[#reloadlist+1] = e
end
end
end
return reloadlist
end
-- curser, means it the parent unloads or loads configs, the sub state will
-- do so as well.
function Cursor.substate(self)
Cursor._substates = Cursor._substates or { }
Cursor._substates[self] = Cursor._substates[self] or cursor_state()
return Cursor._substates[self]
end
local _load = Cursor.load
function Cursor.load(self, ...)
if Cursor._substates and Cursor._substates[self] then
_load(Cursor._substates[self], ...)
end
return _load(self, ...)
end
local _unload = Cursor.unload
function Cursor.unload(self, ...)
if Cursor._substates and Cursor._substates[self] then
_unload(Cursor._substates[self], ...)
end
return _unload(self, ...)
end
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