libs/sys/luasrc/sys/mtdow.lua

   1 --[[
   2 LuCI - Lua Configuration Interface
   3
   4 Copyright 2008 Steven Barth <steven@midlink.org>
   5 Copyright 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
   6
   7 Licensed under the Apache License, Version 2.0 (the "License");
   8 you may not use this file except in compliance with the License.
   9 You may obtain a copy of the License at
  10
  11 http://www.apache.org/licenses/LICENSE-2.0
  12
  13 $Id$
  14 ]]--
  15
  16 local io = require "io"
  17 local os = require "os"
  18 local fs = require "luci.fs"
  19 local util = require "luci.util"
  20 local ltn12 = require "luci.ltn12"
  21 local posix = require "posix"
  22
  23 local type, assert, error = type, assert, error
  24
  25 module "luci.sys.mtdow"
  26
  27 WRITE_IMAGE = 0
  28 WRITE_COMBINED = 1
  29 WRITE_EMULATED = 2
  30
  31 ERROR_INTERNAL = 1
  32 ERROR_NOTFOUND = 2
  33 ERROR_RESOURCE = 3
  34 ERROR_NODETECT = 4
  35 ERROR_NOTAVAIL = 5
  36 ERROR_NOSTREAM = 6
  37 ERROR_INVMAGIC = 7
  38
  39 Writer = util.class()
  40
  41 -- x86
  42 EmulatedWriter = util.class(Writer)
  43 EmulatedWriter.blocks = {
  44         image = {
  45                 magic = "eb48",
  46                 device = "/dev/hda",
  47                 write = WRITE_EMULATED
  48         }
  49 }
  50
  51 function EmulatedWriter.write_block(self, name, imagestream, appendpattern)
  52         if appendpattern then
  53                 os.execute("grep rootfs /proc/mtd >/dev/null || "
  54                         .. "{ echo /dev/hda2,65536,rootfs > "
  55                         .. "/sys/module/block2mtd/parameters/block2mtd }")
  56         end
  57         return Writer.write_block(self, name, imagestream, appendpattern)
  58 end
  59
  60 -- Broadcom
  61 CFEWriter = util.class(Writer)
  62 CFEWriter.blocks = {
  63         image = {
  64                 magic = {"4844", "5735"},
  65                 device = "linux",
  66                 write = WRITE_IMAGE
  67         }
  68 }
  69
  70 -- Magicbox
  71 CommonWriter = util.class(Writer)
  72 CommonWriter.blocks = {
  73         image = {
  74                 device = "linux",
  75                 write = WRITE_COMBINED
  76         }
  77 }
  78
  79 -- Atheros
  80 RedWriter = util.class(Writer)
  81 RedWriter.blocks = {
  82         kernel = {
  83                 device = "vmlinux.bin.l7",
  84                 write = WRITE_IMAGE
  85         },
  86         rootfs = {
  87                 device = "rootfs",
  88                 write = WRITE_COMBINED
  89         }
  90 }
  91
  92 -- Auto Detect
  93 function native_writer()
  94         local w = Writer()
  95
  96         -- Detect amd64 / x86
  97         local x86 = {"x86_64", "i386", "i486", "i586", "i686"}
  98         if util.contains(x86, posix.uname("%m")) then
  99                 return EmulatedWriter()
 100         end
 101
 102         -- Detect CFE
 103         if w:_find_mtdblock("cfe") and w:_find_mtdblock("linux") then
 104                 return CFEWriter()
 105         end
 106
 107         -- Detect Redboot
 108         if w:_find_mtdblock("RedBoot") and w:_find_mtdblock("vmlinux.bin.l7") then
 109                 return RedWriter()
 110         end
 111
 112         -- Detect MagicBox
 113         if fs.readfile("/proc/cpuinfo"):find("MagicBox") then
 114                 return CommonWriter()
 115         end
 116 end
 117
 118
 119
 120 Writer.MTD = "/sbin/mtd"
 121 Writer.SAFEMTD = "/tmp/mtd"
 122 Writer.IMAGEFIFO = "/tmp/mtdimage.fifo"
 123
 124 function Writer.write_block(self, name, imagestream, appendfile)
 125         assert(self.blocks[name], ERROR_NOTFOUND)
 126         local block = self.blocks[name]
 127         local device = block.device
 128         device = fs.stat(device) and device or self:_find_mtdblock(device)
 129         assert(device, ERROR_NODETECT)
 130         if block.magic then
 131                 imagestream = self:_check_magic(imagestream, block.magic)
 132         end
 133         assert(imagestream, ERROR_INVMAGIC)
 134
 135         if appendfile then
 136                 if block.write == WRITE_COMBINED then
 137                         return (self:_write_combined(device, imagestream, appendfile) == 0)
 138                 elseif block.write == WRITE_EMULATED then
 139                         return (self:_write_emulated(device, imagestream, appendfile) == 0)
 140                 else
 141                         error(ERROR_NOTAVAIL)
 142                 end
 143         else
 144                 return (self:_write_memory(device, imagestream) == 0)
 145         end
 146 end
 147
 148 function Writer._check_magic(self, imagestream, magic)
 149         magic = type(magic) == "table" and magic or {magic}
 150
 151         local block = imagestream()
 152         assert(block, ERROR_NOSTREAM)
 153         local cm = "%x%x" % {block:byte(1), block:byte(2)}
 154
 155         if util.contains(magic, cm) then
 156                 return ltn12.source.cat(ltn12.source.string(block), imagestream)
 157         end
 158 end
 159
 160 function Writer._find_mtdblock(self, mtdname)
 161         local k
 162         local prefix = "/dev/mtd"
 163         prefix = prefix .. (fs.stat(prefix) and "/" or "")
 164
 165         for l in io.lines("/proc/mtd") do
 166                 local k = l:match('mtd([%%w-_]+):.*"%s"' % mtdname)
 167                 if k then return prefix..k end
 168         end
 169 end
 170
 171 function Writer._write_emulated(self, devicename, imagestream, appendfile)
 172         local stat = (self:_write_memory(device, imagestream) == 0)
 173         stat = stat and (self:_refresh_block("rootfs") == 0)
 174         local squash = self:_find_mtdblock("rootfs_data")
 175         if squash then
 176                 stat = stat and (self:_append("rootfs_data", imagestream, true) == 0)
 177         else
 178                 stat = stat and (self:_append("rootfs", imagestream) == 0)
 179         end
 180         return stat
 181 end
 182
 183 function Writer._write_memory(self, devicename, imagestream)
 184         local imageproc = posix.fork()
 185         assert(imageproc ~= -1, ERROR_RESOURCE)
 186         if imageproc == 0 then
 187                 fs.unlink(self.IMAGEFIFO)
 188                 assert(posix.mkfifo(self.IMAGEFIFO), ERROR_RESOURCE)
 189                 local imagefifo = io.open(self.IMAGEFIFO, "w")
 190                 assert(imagefifo, ERROR_RESOURCE)
 191                 ltn12.pump.all(imagestream, ltn12.sink.file(imagefifo))
 192                 os.exit(0)
 193         end
 194
 195         return os.execute(
 196                 "%s write '%s' '%s' >/dev/null 2>&1" % {
 197                 self.MTD, self.IMAGEFIFO, devicename
 198                 }
 199         )
 200 end
 201
 202 function Writer._write_combined(self, devicename, imagestream, appendfile)
 203         local imageproc = posix.fork()
 204         assert(imageproc ~= -1, ERROR_RESOURCE)
 205         if imageproc == 0 then
 206                 fs.unlink(self.IMAGEFIFO)
 207                 assert(posix.mkfifo(self.IMAGEFIFO), ERROR_RESOURCE)
 208                 local imagefifo = io.open(self.IMAGEFIFO, "w")
 209                 assert(imagefifo, ERROR_RESOURCE)
 210                 ltn12.pump.all(imagestream, ltn12.sink.file(imagefifo))
 211                 os.exit(0)
 212         end
 213
 214         return os.execute(
 215                 "%s -j '%s' write '%s' '%s' >/dev/null 2>&1" % {
 216                         self.MTD, appendfile, self.IMAGEFIFO, devicename
 217                 }
 218         )
 219 end
 220
 221 function Writer._refresh_block(self, devicename)
 222         return os.execute("%s refresh '%s' >/dev/null 2>&1" % {self.MTD, devicename})
 223 end
 224
 225 function Writer._append(self, devicename, appendfile, erase)
 226         erase = erase and ("-e '%s' " % devicename) or ''
 227
 228         return os.execute(
 229                 "%s %s jffs2write '%s' '%s' >/dev/null 2>&1" % {
 230                         self.MTD, erase, appendfile, devicename
 231                 }
 232         )
 233 end