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 --- Savely load the configuration.
  83 -- @param config        Configuration to load
  84 -- @return                      Sucess status
  85 -- @see                         load_state
  86 -- @see                         load
  87 function load_config(...)
  88         set_confdir(confdir_default)
  89         set_savedir(savedir_default)
  90         return load(...)
  91 end
  92
  93 --- Savely load state values.
  94 -- @param config        Configuration to load
  95 -- @return                      Sucess status
  96 -- @see                         load_config
  97 -- @see                         load
  98 function load_state(config)
  99         set_confdir(confdir_default)
 100         set_savedir(savedir_state)
 101         return load(config)
 102 end
 103
 104 --- Save changes to config values.
 105 -- @param config        Configuration to save
 106 -- @return                      Sucess status
 107 -- @see                         save_state
 108 -- @see                         save
 109 function save_config(config)
 110         set_savedir(savedir_default)
 111         return save(config)
 112 end
 113
 114 --- Save changes to state values.
 115 -- @param config        Configuration to save
 116 -- @return                      Sucess status
 117 -- @see                         save_config
 118 -- @see                         save
 119 function save_state(config)
 120         set_savedir(savedir_state)
 121         return save(config)
 122 end
 123
 124 --- Updated the data of a section using data from a table.
 125 -- @param config        UCI config
 126 -- @param section       UCI section name (optional)
 127 -- @param values        Table of key - value pairs to update the section with
 128 function tset(config, section, values)
 129         local stat = true
 130         for k, v in pairs(values) do
 131                 if k:sub(1, 1) ~= "." then
 132                         stat = stat and set(config, section, k, v)
 133                 end
 134         end
 135         return stat
 136 end
 137
 138
 139 --- Add an anonymous section.
 140 -- @class function
 141 -- @name add
 142 -- @param config        UCI config
 143 -- @param type          UCI section type
 144 -- @return                      Name of created section
 145
 146 --- Get a table of unsaved changes.
 147 -- @class function
 148 -- @name changes
 149 -- @param config        UCI config
 150 -- @return                      Table of changes
 151
 152 --- Commit unsaved changes.
 153 -- @class function
 154 -- @name commit
 155 -- @param config        UCI config
 156 -- @return                      Boolean whether operation succeeded
 157 -- @see revert
 158
 159 --- Deletes a section or an option.
 160 -- @class function
 161 -- @name delete
 162 -- @param config        UCI config
 163 -- @param section       UCI section name
 164 -- @param option        UCI option (optional)
 165 -- @return                      Boolean whether operation succeeded
 166
 167 --- Call a function for every section of a certain type.
 168 -- @class function
 169 -- @name foreach
 170 -- @param config        UCI config
 171 -- @param type          UCI section type
 172 -- @param callback      Function to be called
 173 -- @return                      Boolean whether operation succeeded
 174
 175 --- Get a section type or an option
 176 -- @class function
 177 -- @name get
 178 -- @param config        UCI config
 179 -- @param section       UCI section name
 180 -- @param option        UCI option (optional)
 181 -- @return                      UCI value
 182
 183 --- Get all sections of a config or all values of a section.
 184 -- @class function
 185 -- @name get_all
 186 -- @param config        UCI config
 187 -- @param section       UCI section name (optional)
 188 -- @return                      Table of UCI sections or table of UCI values
 189
 190 --- Manually load a config.
 191 -- Warning: This function is unsave! You should use load_config or load_state if possible.
 192 -- @class function
 193 -- @name load
 194 -- @param config        UCI config
 195 -- @return                      Boolean whether operation succeeded
 196 -- @see load_config
 197 -- @see load_state
 198 -- @see save
 199 -- @see unload
 200
 201 --- Revert unsaved changes.
 202 -- @class function
 203 -- @name revert
 204 -- @param config        UCI config
 205 -- @return                      Boolean whether operation succeeded
 206 -- @see commit
 207
 208 --- Saves changes made to a config to make them committable.
 209 -- @class function
 210 -- @name save
 211 -- @param config        UCI config
 212 -- @return                      Boolean whether operation succeeded
 213 -- @see load
 214 -- @see unload
 215
 216 --- Set a value or create a named section.
 217 -- Warning: This function is unsave! You should use save_config or save_state if possible.
 218 -- @class function
 219 -- @name set
 220 -- @param config        UCI config
 221 -- @param section       UCI section name
 222 -- @param option        UCI option or UCI section type
 223 -- @param value         UCI value or nil if you want to create a section
 224 -- @return                      Boolean whether operation succeeded
 225
 226 --- Set the configuration directory.
 227 -- @class function
 228 -- @name set_confdir
 229 -- @param directory     UCI configuration directory
 230 -- @return                      Boolean whether operation succeeded
 231
 232 --- Set the directory for uncommited changes.
 233 -- @class function
 234 -- @name set_savedir
 235 -- @param directory     UCI changes directory
 236 -- @return                      Boolean whether operation succeeded
 237
 238 --- Discard changes made to a config.
 239 -- @class function
 240 -- @name unload
 241 -- @param config        UCI config
 242 -- @return                      Boolean whether operation succeeded
 243 -- @see load
 244 -- @see save