core/src/fs.lua

   1 --[[
   2 FFLuCI - Filesystem tools
   3
   4 Description:
   5 A module offering often needed filesystem manipulation functions
   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
  27 module("ffluci.fs", package.seeall)
  28
  29 require("posix")
  30
  31 -- Glob
  32 glob = posix.glob
  33
  34 -- Checks whether a file exists
  35 function isfile(filename)
  36         local fp = io.open(filename, "r")
  37         if fp then fp:close() end
  38         return fp ~= nil
  39 end
  40
  41 -- Returns the content of file
  42 function readfile(filename)
  43         local fp, err = io.open(filename)
  44
  45         if fp == nil then
  46                 return nil, err
  47         end
  48
  49         local data = fp:read("*a")
  50         fp:close()
  51         return data
  52 end
  53
  54 -- Writes given data to a file
  55 function writefile(filename, data)
  56         local fp, err = io.open(filename, "w")
  57
  58         if fp == nil then
  59                 return nil, err
  60         end
  61
  62         fp:write(data)
  63         fp:close()
  64
  65         return true
  66 end
  67
  68 -- Returns the file modification date/time of "path"
  69 function mtime(path)
  70         return posix.stat(path, "mtime")
  71 end
  72
  73 -- basename wrapper
  74 basename = posix.basename
  75
  76 -- dirname wrapper
  77 dirname = posix.dirname
  78
  79 -- dir wrapper
  80 dir = posix.dir
  81
  82 -- Alias for posix.mkdir
  83 mkdir = posix.mkdir
  84
  85 -- Alias for posix.rmdir
  86 rmdir = posix.rmdir