Initial implementation of OpenWrt mtd writer

libs/sys/luasrc/sys/mtdow.lua

@@ -0,0 +1,192 @@
+--[[
+LuCI - Lua Configuration Interface
+
+Copyright 2008 Steven Barth <steven@midlink.org>
+Copyright 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+$Id$
+]]--
+
+local io = require "io"
+local os = require "os"
+local fs = require "luci.fs"
+local util = require "luci.util"
+local ltn12 = require "luci.ltn12"
+local posix = require "posix"
+
+local type, assert, error = type, assert, error
+
+module "luci.sys.mtdow"
+
+local WRITE_IMAGE = 0
+local WRITE_COMBINED = 1
+local WRITE_EMULATED = 2
+
+Writer = util.class()
+
+-- x86
+EmulatedWriter = util.class(Writer)
+EmulatedWriter.blocks = {
+	image = {
+		magic = "eb48",
+		device = "/dev/hda",
+		write = WRITE_SEPARATELY
+	}
+}
+
+-- Broadcom
+TRXWriter = util.class(Writer)
+TRXWriter.blocks = {
+	image = {
+		magic = {"4844", "5735"},
+		device = "linux",
+		write = WRITE_COMBINED
+	}
+}
+
+-- Magicbox
+CommonWriter = util.class(Writer)
+CommonWriter.blocks = {
+	image = {
+		device = "linux",
+		write = WRITE_COMBINED
+	}
+}
+
+-- Atheros
+RedWriter = util.class(Writer)
+RedWriter.blocks = {
+	kernel = {
+		device = "vmlinux.bin.l7",
+		write = WRITE_IMAGE
+	},
+	rootfs = {
+		device = "rootfs",
+		write = WRITE_COMBINED
+	} 
+}
+
+function EmulatedWriter.write_block(self, name, imagestream, appendpattern)
+	if appendpattern then
+		os.execute("grep rootfs /proc/mtd >/dev/null || "
+			.. "{ echo /dev/hda2,65536,rootfs > "
+			.. "/sys/module/block2mtd/parameters/block2mtd }")
+	end
+	return Writer.write_block(self, name, imagestream, appendpattern)
+end
+
+
+Writer.MTD = "/sbin/mtd"
+Writer.SAFEMTD = "/tmp/mtd"
+Writer.IMAGEFIFO = "/tmp/mtdimage.fifo"
+
+function Writer.write_block(self, name, imagestream, appendfile)
+	assert(self.blocks[name], "Undefined block: " % name)
+	local block = self.blocks[name]
+	local device = block.device
+	device = fs.stat(device) and device or self:_find_mtdblock(device)
+	assert(device, "Unable to determine device file")
+	if block.magic then
+		imagestream = self:_check_magic(imagestream, block.magic)
+	end
+	assert(imagestream, "Invalid image file")
+	
+	if appendfile then
+		if block.write == WRITE_COMBINED then
+			return (self:_write_combined(device, imagestream, appendfile) == 0)
+		elseif block.write == WRITE_EMULATED then
+			return (self:_write_emulated(device, imagestream, appendfile) == 0)
+		else
+			error("Appending is not supported for selected platform.")
+		end
+	else
+		return (self:_write_memory(device, imagestream) == 0)
+	end
+end
+
+function Writer._check_magic(self, imagestream, magic)
+	magic = type(magic) == "table" and magic or {magic}
+	
+	local block = imagestream()
+	assert(block, "Invalid image stream")
+	local cm = "%x%x" % {block:byte(1), block:byte(2)}
+	
+	if util.contains(magic, cm) then
+		return ltn12.source.cat(ltn12.source.string(block), imagestream)
+	end
+end
+
+function Writer._find_mtdblock(self, mtdname)
+	local k
+	local prefix = "/dev/mtdblock"
+	prefix = prefix .. (fs.stat(prefix) and "/" or "")
+	
+	for l in io.lines("/proc/mtd") do
+		local k = l:match('([%w-_]+):.*-"%s"' % mtdname)
+		if k then return prefix..k end
+	end
+end
+
+function Write._write_emulated(self, devicename, imagestream, appendfile)
+	local stat = (self:_write_memory(device, imagestream) == 0)
+	stat = stat and (self:_refresh_block("rootfs") == 0)
+	local squash = self:_find_mtdblock("rootfs_data")
+	if squash then
+		stat = stat and (self:_append("rootfs_data", imagestream, true) == 0)
+	else
+		stat = stat and (self:_append("rootfs", imagestream) == 0)
+	end
+	return stat
+end
+
+function Writer._write_memory(self, devicename, imagestream)
+	local devicestream = ltn12.sink.file(io.open(devicename, "w"))
+	local stat, err = ltn12.pump.all(imagestream, devicestream)
+	if stat then
+		return os.execute("sync")
+	end
+end
+
+function Writer._write_combined(self, devicename, imagestream, appendfile)
+	assert(fs.copy(self.MTD, self.SAFEMTD), "Unable to copy mtd writer")
+	assert(posix.mkfifo(self.IMAGEFIFO), "Unable to create image pipe")
+	
+	local imagefifo = io.open(self.IMAGEFIFO, "w")
+	
+	assert(imagefifo, "Unable to open image pipe")
+	
+	local imageproc = posix.fork()
+	assert(imageproc ~= -1, "Unable to fork()")
+	if imageproc == 0 then
+		ltn12.pump.all(imagestream, ltn12.sink.file(imagefifo))
+		os.exit(0)
+	end
+	
+	return os.execute( 
+		"%s -j '%s' write '%s' '%s'" % {
+			self.SAFEMTD, appendfile, devicename, self.IMAGEFIFO
+		}
+	)
+end
+
+function Writer._refresh_block(self, devicename)
+	assert(fs.copy(self.MTD, self.SAFEMTD), "Unable to copy mtd writer")
+	return os.execute("%s refresh '%s'" % {self.SAFEMTD, devicename})
+end
+
+function Writer._append(self, devicename, appendfile, erase)
+	assert(fs.copy(self.MTD, self.SAFEMTD), "Unable to copy mtd writer")
+	erase = erase and ("-e '%s' " % devicename) or ''
+	
+	return os.execute( 
+		"%s %s jffs2write '%s' '%s'" % {
+			self.SAFEMTD, erase, appendfile, devicename
+		}
+	)
+end