libs/uci/luasrc/model/uci.lua

   1 --[[
   2 LuCI - UCI mpdel
   3
   4 Description:
   5 Generalized UCI model
   6
   7 FileId:
   8 $Id$
   9
  10 License:
  11 Copyright 2008 Steven Barth <steven@midlink.org>
  12
  13 Licensed under the Apache License, Version 2.0 (the "License");
  14 you may not use this file except in compliance with the License.
  15 You may obtain a copy of the License at
  16
  17         http://www.apache.org/licenses/LICENSE-2.0
  18
  19 Unless required by applicable law or agreed to in writing, software
  20 distributed under the License is distributed on an "AS IS" BASIS,
  21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  22 See the License for the specific language governing permissions and
  23 limitations under the License.
  24
  25 ]]--
  26 local uci  = require("uci")
  27 local util = require("luci.util")
  28 local setmetatable, rawget, rawset = setmetatable, rawget, rawset
  29 local error, pairs, ipairs, tostring = error, pairs, ipairs, tostring
  30 local table = table
  31
  32 --- LuCI UCI model library.
  33 module("luci.model.uci", function(m) setmetatable(m, {__index = uci}) end)
  34
  35 savedir_default = "/tmp/.uci"
  36 confdir_default = "/etc/config"
  37
  38 savedir_state = "/var/state"
  39
  40 --- Delete all sections of a given type that match certain criteria.
  41 -- @param config                UCI config
  42 -- @param type                  UCI section type
  43 -- @param comparator    Function that will be called for each section and
  44 -- returns a boolean whether to delete the current section (optional)
  45 function delete_all(config, type, comparator)
  46         local del = {}
  47         local function helper (section)
  48                         if not comparator or comparator(section) then
  49                                 table.insert(del, section[".name"])
  50                         end
  51         end
  52
  53         foreach(config, type, helper)
  54
  55         for i, j in ipairs(del) do
  56                 delete(config, j)
  57         end
  58 end
  59
  60 --- Create a new section and initialize it with data.
  61 -- @param config        UCI config
  62 -- @param type          UCI section type
  63 -- @param name          UCI section name (optional)
  64 -- @param values        Table of key - value pairs to initialize the section with
  65 -- @return                      Name of created section
  66 function section(config, type, name, values)
  67         local stat = true
  68         if name then
  69                 stat = set(config, name, type)
  70         else
  71                 name = add(config, type)
  72                 stat = name and true
  73         end
  74
  75         if stat and values then
  76                 stat = tset(config, name, values)
  77         end
  78
  79         return stat and name
  80 end
  81
  82 --- Get a certain state value.
  83 -- @param ...   Parameters passed to function get
  84 -- @return              UCI value
  85 -- @see                 get
  86 function get_statevalue(...)
  87         set_savedir(savedir_state)
  88         local result = get(...)
  89         set_savedir(savedir_default)
  90         return result
  91 end
  92
  93 --- Updated the data of a section using data from a table.
  94 -- @param config        UCI config
  95 -- @param section       UCI section name (optional)
  96 -- @param values        Table of key - value pairs to update the section with
  97 function tset(config, section, values)
  98         local stat = true
  99         for k, v in pairs(values) do
 100                 if k:sub(1, 1) ~= "." then
 101                         stat = stat and set(config, section, k, v)
 102                 end
 103         end
 104         return stat
 105 end
 106
 107
 108 --- Add an anonymous section.
 109 -- @class function
 110 -- @name add
 111 -- @param config        UCI config
 112 -- @param type          UCI section type
 113 -- @return                      Name of created section
 114
 115 --- Get a table of unsaved changes.
 116 -- @class function
 117 -- @name changes
 118 -- @param config        UCI config
 119 -- @return                      Table of changes
 120
 121 --- Commit unsaved changes.
 122 -- @class function
 123 -- @name commit
 124 -- @param config        UCI config
 125 -- @return                      Boolean whether operation succeeded
 126 -- @see revert
 127
 128 --- Deletes a section or an option.
 129 -- @class function
 130 -- @name delete
 131 -- @param config        UCI config
 132 -- @param section       UCI section name
 133 -- @param option        UCI option (optional)
 134 -- @return                      Boolean whether operation succeeded
 135
 136 --- Call a function for every section of a certain type.
 137 -- @class function
 138 -- @name foreach
 139 -- @param config        UCI config
 140 -- @param type          UCI section type
 141 -- @param callback      Function to be called
 142 -- @return                      Boolean whether operation succeeded
 143
 144 --- Get a section type or an option
 145 -- @class function
 146 -- @name get
 147 -- @param config        UCI config
 148 -- @param section       UCI section name
 149 -- @param option        UCI option (optional)
 150 -- @return                      UCI value
 151
 152 --- Get all sections of a config or all values of a section.
 153 -- @class function
 154 -- @name get_all
 155 -- @param config        UCI config
 156 -- @param section       UCI section name (optional)
 157 -- @return                      Table of UCI sections or table of UCI values
 158
 159 --- Manually load a config.
 160 -- @class function
 161 -- @name load
 162 -- @param config        UCI config
 163 -- @return                      Boolean whether operation succeeded
 164 -- @see save
 165 -- @see unload
 166
 167 --- Revert unsaved changes.
 168 -- @class function
 169 -- @name revert
 170 -- @param config        UCI config
 171 -- @return                      Boolean whether operation succeeded
 172 -- @see commit
 173
 174 --- Saves changes made to a config to make them committable.
 175 -- @class function
 176 -- @name save
 177 -- @param config        UCI config
 178 -- @return                      Boolean whether operation succeeded
 179 -- @see load
 180 -- @see unload
 181
 182 --- Set a value or create a named section.
 183 -- @class function
 184 -- @name set
 185 -- @param config        UCI config
 186 -- @param section       UCI section name
 187 -- @param option        UCI option or UCI section type
 188 -- @param value         UCI value or nil if you want to create a section
 189 -- @return                      Boolean whether operation succeeded
 190
 191 --- Set the configuration directory.
 192 -- @class function
 193 -- @name set_confdir
 194 -- @param directory     UCI configuration directory
 195 -- @return                      Boolean whether operation succeeded
 196
 197 --- Set the directory for uncommited changes.
 198 -- @class function
 199 -- @name set_savedir
 200 -- @param directory     UCI changes directory
 201 -- @return                      Boolean whether operation succeeded
 202
 203 --- Discard changes made to a config.
 204 -- @class function
 205 -- @name unload
 206 -- @param config        UCI config
 207 -- @return                      Boolean whether operation succeeded
 208 -- @see load
 209 -- @see save