diff --git a/apis/blocks.lua b/apis/blocks.lua
index 2077c5b..571b03a 100644
--- a/apis/blocks.lua
+++ b/apis/blocks.lua
@@ -64,7 +64,7 @@ function blockDB:lookup(id, dmg)
   if not id then
     return
   end
- 
+
   return self.data[id .. ':' .. dmg]
 end
 
@@ -136,12 +136,12 @@ function placementDB:addSubsForBlockType(id, dmg, bt)
       sub.extra)
   end
 end
- 
+
 function placementDB:add(id, dmg, sid, sdmg, direction, extra)
   if direction and #direction == 0 then
     direction = nil
   end
- 
+
   local entry = {
     oid = id,      -- numeric ID
     odmg = dmg,    -- dmg with placement info
@@ -176,9 +176,9 @@ function blockTypeDB:addTemp(blockType, subs)
   end
   self.dirty = true
 end
- 
+
 function blockTypeDB:load()
- 
+
   blockTypeDB:addTemp('stairs', {
     { 0, nil, 0, 'east-up' },
     { 1, nil, 0, 'west-up' },
@@ -575,7 +575,8 @@ function Blocks:init(args)
   placementDB:load2(blockDB, blockTypeDB)
 end
 
--- for an ID / dmg (with placement info) - return the correct block (without the placment info embedded in the dmg)
+-- for an ID / dmg (with placement info)
+-- return the correct block (without the placment info embedded in the dmg)
 function Blocks:getPlaceableBlock(id, dmg)
 
   local p = placementDB:get({id, dmg})
diff --git a/apis/chestAdapter.lua b/apis/chestAdapter.lua
index e23506a..5502967 100644
--- a/apis/chestAdapter.lua
+++ b/apis/chestAdapter.lua
@@ -13,7 +13,7 @@ local convertNames = {
   displayName = 'display_name',
   maxDamage = 'max_dmg',
 }
-local keys = { 
+local keys = {
   'damage',
   'displayName',
   'maxCount',
@@ -31,7 +31,7 @@ local function safeString(text)
 
     local newText = {}
     for i = 4, #text do
-      local val = text:byte(i)
+      val = text:byte(i)
       newText[i - 3] = (val > 31 and val < 127) and val or 63
     end
     return string.char(unpack(newText))
@@ -65,11 +65,11 @@ function ChestAdapter:init(args)
     Util.merge(self, chest)
   end
 end
- 
+
 function ChestAdapter:isValid()
   return not not self.getAllStacks
 end
- 
+
 function ChestAdapter:refresh(throttle)
   return self:listItems(throttle)
 end
@@ -109,12 +109,11 @@ function ChestAdapter:getItemInfo(item)
   local key = table.concat({ item.name, item.damage, item.nbtHash }, ':')
   return self.cache[key]
 end
- 
-function ChestAdapter:craft(id, dmg, qty)
-  return false
+
+function ChestAdapter:craft()
 end
 
-function ChestAdapter:craftItems(items)
+function ChestAdapter:craftItems()
 end
 
 function ChestAdapter:provide(item, qty, slot, direction)
@@ -144,7 +143,7 @@ end
 function ChestAdapter:insert(slot, qty)
   local s, m = pcall(function() self.pullItem(self.direction, slot, qty) end)
   if not s and m then
-    sleep(1)
+    os.sleep(1)
     pcall(function() self.pullItem(self.direction, slot, qty) end)
   end
 end
diff --git a/apis/chestAdapter18.lua b/apis/chestAdapter18.lua
index 0dae1ea..25d043b 100644
--- a/apis/chestAdapter18.lua
+++ b/apis/chestAdapter18.lua
@@ -5,7 +5,7 @@ local Peripheral = require('peripheral')
 
 local ChestAdapter = class()
 
-local keys = Util.transpose({ 
+local keys = Util.transpose({
   'damage',
   'displayName',
   'maxCount',
@@ -22,7 +22,7 @@ function ChestAdapter:init(args)
   }
   Util.merge(self, defaults)
   Util.merge(self, args)
-  
+
   local chest = Peripheral.getBySide(self.wrapSide)
   if not chest then
     chest = Peripheral.getByMethod('list')
@@ -106,10 +106,10 @@ function ChestAdapter:getItemInfo(item)
   return self.cache[key]
 end
 
-function ChestAdapter:craft(name, damage, qty)
+function ChestAdapter:craft()
 end
 
-function ChestAdapter:craftItems(items)
+function ChestAdapter:craftItems()
 end
 
 function ChestAdapter:provide(item, qty, slot, direction)
diff --git a/apis/meAdapter.lua b/apis/meAdapter.lua
index d8ec367..1f3b7d9 100644
--- a/apis/meAdapter.lua
+++ b/apis/meAdapter.lua
@@ -3,7 +3,8 @@ local itemDB     = require('itemDB')
 local Peripheral = require('peripheral')
 local Util       = require('util')
 
-local MEAdapter = class()
+local os         = _G.os
+local peripheral = _G.peripheral
 
 local convertNames = {
   name = 'id',
@@ -13,7 +14,7 @@ local convertNames = {
   displayName = 'display_name',
   maxDamage = 'max_dmg',
 }
-local keys = { 
+local keys = {
   'damage',
   'displayName',
   'maxCount',
@@ -31,7 +32,7 @@ local function safeString(text)
 
     local newText = {}
     for i = 4, #text do
-      local val = text:byte(i)
+      val = text:byte(i)
       newText[i - 3] = (val > 31 and val < 127) and val or 63
     end
     return string.char(unpack(newText))
@@ -48,6 +49,8 @@ local function convertItem(item)
   item.displayName = safeString(item.displayName)
 end
 
+local MEAdapter = class()
+
 function MEAdapter:init(args)
   local defaults = {
     items = { },
@@ -72,7 +75,7 @@ function MEAdapter:init(args)
     end
   end
 end
- 
+
 function MEAdapter:isValid()
   return self.getAvailableItems and self.getAvailableItems()
 end
@@ -102,9 +105,9 @@ function MEAdapter:listItems()
   self:refresh()
   return self.items
 end
- 
+
 function MEAdapter:getItemInfo(item)
-   for key,i in pairs(self.items) do
+   for _,i in pairs(self.items) do
     if item.name == i.name and item.damage == i.damage and item.nbtHash == i.nbtHash then
       return i
     end
@@ -123,7 +126,7 @@ function MEAdapter:isCPUAvailable()
     end
   end
   return available
-end 
+end
 
 function MEAdapter:craft(item, count)
 
@@ -133,7 +136,7 @@ function MEAdapter:craft(item, count)
 
   self:refresh()
 
-  local item = self:getItemInfo(item)
+  item = self:getItemInfo(item)
   if item and item.is_craftable then
 
     local cpus = self.getCraftingCPUs() or { }
@@ -186,8 +189,8 @@ end
 
 function MEAdapter:isCrafting(item)
   for _,v in pairs(self:getJobList()) do
-    if v.name == item.name and 
-       v.damage == item.damage and 
+    if v.name == item.name and
+       v.damage == item.damage and
        v.nbtHash == item.nbtHash then
       return true
     end
@@ -220,7 +223,7 @@ function MEAdapter:provide(item, count, slot, direction)
   return pcall(function()
     while count > 0 do
       local qty = math.min(count, 64)
-      local s, m = self.exportItem({
+      local s = self.exportItem({
         id = item.name,
         dmg = item.damage
       }, direction or self.direction, qty, slot)
@@ -232,18 +235,14 @@ function MEAdapter:provide(item, count, slot, direction)
     end
   end)
 end
- 
+
 function MEAdapter:insert(slot, count)
   local s, m = pcall(function() self.pullItem(self.direction, slot, count) end)
   if not s and m then
-    print('MEAdapter:pullItem')
-    print(m)
-    sleep(1)
+    os.sleep(1)
     s, m = pcall(function() self.pullItem(self.direction, slot, count) end)
     if not s and m then
-      print('MEAdapter:pullItem')
-      print(m)
-      read()
+      error(m)
     end
   end
 end
diff --git a/apis/nameDB.lua b/apis/nameDB.lua
index a5115bb..0b22bde 100644
--- a/apis/nameDB.lua
+++ b/apis/nameDB.lua
@@ -12,7 +12,7 @@ function nameDB:load()
   end
 
   for strId, block in pairs(blocks) do
-    local strId = 'minecraft:' .. strId
+    strId = 'minecraft:' .. strId
     if type(block.name) == 'string' then
       self.data[strId .. ':0'] = block.name
     else
diff --git a/apis/refinedAdapter.lua b/apis/refinedAdapter.lua
index 1977f30..e69b0b7 100644
--- a/apis/refinedAdapter.lua
+++ b/apis/refinedAdapter.lua
@@ -5,7 +5,7 @@ local itemDB     = require('itemDB')
 
 local RefinedAdapter = class()
 
-local keys = { 
+local keys = {
   'damage',
   'displayName',
   'maxCount',
@@ -109,8 +109,8 @@ end
 function RefinedAdapter:isCrafting(item)
   for _,task in pairs(self.getCraftingTasks()) do
     local output = task.getPattern().outputs[1]
-    if output.name == item.name and 
-       output.damage == item.damage and 
+    if output.name == item.name and
+       output.damage == item.damage and
        output.nbtHash == item.nbtHash then
       return true
     end
@@ -125,18 +125,18 @@ function RefinedAdapter:craft(item, qty)
   end
 end
 
-function RefinedAdapter:craftItems(items)
+function RefinedAdapter:craftItems()
   return false
 end
 
-function RefinedAdapter:provide(item, qty, slot)
+function RefinedAdapter:provide()
 end
- 
-function RefinedAdapter:extract(slot, qty)
+
+function RefinedAdapter:extract()
 --  self.pushItems(self.direction, slot, qty)
 end
 
-function RefinedAdapter:insert(slot, qty)
+function RefinedAdapter:insert()
 --  self.pullItems(self.direction, slot, qty)
 end
 
diff --git a/apis/schematic.lua b/apis/schematic.lua
index f7d08d9..5a76eb9 100644
--- a/apis/schematic.lua
+++ b/apis/schematic.lua
@@ -4,6 +4,11 @@ local DEFLATE = require('deflatelua')
 local UI      = require('ui')
 local Point   = require('point')
 
+local bit    = _G.bit
+local fs     = _G.fs
+local term   = _G.term
+local turtle = _G.turtle
+
 --[[
   Loading and manipulating a schematic
 --]]
@@ -24,7 +29,7 @@ end
 --[[
   Credit to Orwell for the schematic file reader code
   http://www.computercraft.info/forums2/index.php?/topic/1949-turtle-schematic-file-builder/
- 
+
   Some parts of the file reader code was modified from the original
 --]]
 
@@ -52,7 +57,7 @@ function Schematic:readname(h)
     local c = h:readbyte(h)
     if c == nil then
       return
-    end  
+    end
     str = str .. string.char(c)
   end
   return str
@@ -218,11 +223,11 @@ function DiskFile:close()
 end
 
 local MemoryFile = class()
-function MemoryFile:init(args)
+function MemoryFile:init()
   self.s = { }
   self.i = 1
 end
-function MemoryFile:open(filename)
+function MemoryFile:open()
   self.i = 1
 end
 function MemoryFile:close() end
@@ -247,7 +252,7 @@ function Schematic:decompress(ifname, spinner)
   local mh = MemoryFile()
 
   DEFLATE.gunzip({
-    input=function(...) spinner:spin() return ifh.read() end,
+    input=function() spinner:spin() return ifh.read() end,
     output=function(b) mh:write(b) end,
     disable_crc=true
   })
@@ -310,7 +315,7 @@ end
 
 function Schematic:load(filename)
 
-  local cursorX, cursorY = term.getCursorPos()
+  local _, cursorY = term.getCursorPos()
   local spinner = UI.Spinner({
     x = UI.term.width,
     y = cursorY - 1
@@ -757,7 +762,7 @@ function Schematic:determineBlockPlacement(y)
       -- otherwise, the turtle must place the block from the same plane
       -- against another block
       -- if no block to place against (from side) then the turtle must place from
-      -- the other side 
+      -- the other side
       --
       -- Stair bug in 1.7 - placing a stair southward doesn't respect the turtle's direction
       -- all other directions are fine
@@ -843,8 +848,6 @@ end
 -- set the order for block dependencies
 function Schematic:setPlacementOrder(spinner, placementChains)
 
-  local cursorX, cursorY = term.getCursorPos()
-
   -- optimize for overlapping check
   for _,chain in pairs(placementChains) do
     for index,_ in pairs(chain.keys) do
@@ -917,9 +920,9 @@ function Schematic:setPlacementOrder(spinner, placementChains)
     ]]--
 
     local masterChain = table.remove(chains)
- 
+
     --[[ it's something like this:
- 
+
        A chain     B chain           result
           1                            1
           2 --------  2                2
@@ -1040,12 +1043,10 @@ v.info = 'Unplaceable'
   end
 
   term.clearLine()
-
-  return t
 end
 
 function Schematic:optimizeRoute(spinner, y)
- 
+
   local function getNearestNeighbor(p, pt, maxDistance)
     local key, block, heading
     local moves = maxDistance
@@ -1146,7 +1147,6 @@ function Schematic:optimizeRoute(spinner, y)
 
   local maxDistance = self.width*self.length
   local plane, doors = extractPlane(y)
-  spinner:spin(percent)
   pt.index = 0
   for i = 1, #plane do
     local b = getNearestNeighbor(plane, pt, maxDistance)
diff --git a/apis/tableDB.lua b/apis/tableDB.lua
index 5432206..a985522 100644
--- a/apis/tableDB.lua
+++ b/apis/tableDB.lua
@@ -11,14 +11,14 @@ function TableDB:init(args)
   Util.merge(defaults, args)
   Util.merge(self, defaults)
 end
- 
+
 function TableDB:load()
   local t = Util.readTable(self.fileName)
   if t then
     self.data = t.data or t
   end
 end
- 
+
 function TableDB:add(key, entry)
   if type(key) == 'table' then
     key = table.concat(key, ':')
@@ -26,19 +26,19 @@ function TableDB:add(key, entry)
   self.data[key] = entry
   self.dirty = true
 end
- 
+
 function TableDB:get(key)
   if type(key) == 'table' then
     key = table.concat(key, ':')
   end
   return self.data[key]
 end
- 
+
 function TableDB:remove(key)
   self.data[key] = nil
   self.dirty = true
 end
- 
+
 function TableDB:flush()
   if self.dirty then
     Util.writeTable(self.fileName, self.data)
diff --git a/apps/Appstore.lua b/apps/Appstore.lua
index 5fb217b..e2060d6 100644
--- a/apps/Appstore.lua
+++ b/apps/Appstore.lua
@@ -1,25 +1,28 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Ansi   = require('ansi')
-local Config = require('config')
 local SHA1   = require('sha1')
 local UI     = require('ui')
 local Util   = require('util')
 
--- scrap this entire file. don't muck with standard apis
+local fs         = _G.fs
+local http       = _G.http
+local multishell = _ENV.multishell
+local os         = _G.os
+local shell      = _ENV.shell
 
 local REGISTRY_DIR = 'usr/.registry'
 
 
 --                                           FIX SOMEDAY
-function os.registerApp(app, key)
+local function registerApp(app, key)
 
   app.key = SHA1.sha1(key)
   Util.writeTable(fs.combine(REGISTRY_DIR, app.key), app)
   os.queueEvent('os_register_app')
 end
 
-function os.unregisterApp(key)
+local function unregisterApp(key)
 
   local filename = fs.combine(REGISTRY_DIR, SHA1.sha1(key))
   if fs.exists(filename) then
@@ -29,7 +32,7 @@ function os.unregisterApp(key)
 end
 
 
-local sandboxEnv = Util.shallowCopy(getfenv(1))
+local sandboxEnv = Util.shallowCopy(_ENV)
 setmetatable(sandboxEnv, { __index = _G })
 
 multishell.setTitle(multishell.getCurrent(), 'App Store')
@@ -243,7 +246,7 @@ function appPage:eventHandler(event)
 
   elseif event.type == 'uninstall' then
     if self.app.runOnly then
-      s,m = runApp(self.app, false, 'uninstall')
+      runApp(self.app, false, 'uninstall')
     else
       fs.delete(fs.combine(APP_DIR, self.app.name))
       self.notification:success("Uninstalled " .. self.app.name, 3)
@@ -251,7 +254,7 @@ function appPage:eventHandler(event)
       self.menuBar.removeButton:disable('Remove')
       self.menuBar:draw()
 
-      os.unregisterApp(self.app.creator .. '.' .. self.app.name)
+      unregisterApp(self.app.creator .. '.' .. self.app.name)
     end
 
   elseif event.type == 'install' then
@@ -275,7 +278,7 @@ function appPage:eventHandler(event)
           category = 'Games'
         end
 
-        os.registerApp({
+        registerApp({
           run = fs.combine(APP_DIR, self.app.name),
           title = self.app.title,
           category = category,
@@ -314,7 +317,7 @@ local categoryPage = UI.Page {
 
 function categoryPage:setCategory(source, name, index)
   self.grid.values = { }
-  for k,v in pairs(source.storeURLs) do
+  for _,v in pairs(source.storeURLs) do
     if index == 0 or index == v.catagory then
       table.insert(self.grid.values, v)
     end
@@ -339,7 +342,7 @@ function categoryPage:setSource(source)
     end
 
     local buttons = { }
-    for k,v in Util.spairs(source.storeCatagoryNames, 
+    for k,v in Util.spairs(source.storeCatagoryNames,
           function(a, b) return a:lower() < b:lower() end) do
 
       if v ~= 'Operating System' then
diff --git a/apps/Events.lua b/apps/Events.lua
index 3276b63..882d68c 100644
--- a/apps/Events.lua
+++ b/apps/Events.lua
@@ -1,9 +1,12 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Event = require('event')
 local UI    = require('ui')
 local Util  = require('util')
 
+local multishell = _ENV.multishell
+local os         = _G.os
+
 multishell.setTitle(multishell.getCurrent(), 'Events')
 UI:configure('Events', ...)
 
diff --git a/apps/Peripherals.lua b/apps/Peripherals.lua
index 11cb3af..9dbf6a3 100644
--- a/apps/Peripherals.lua
+++ b/apps/Peripherals.lua
@@ -1,4 +1,4 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Ansi  = require('ansi')
 local Event = require('event')
@@ -6,6 +6,7 @@ local UI    = require('ui')
 local Util  = require('util')
 
 local colors = _G.colors
+local multishell = _ENV.multishell
 local peripheral = _G.peripheral
 
 multishell.setTitle(multishell.getCurrent(), 'Devices')
diff --git a/apps/Script.lua b/apps/Script.lua
index 4436abb..f16fdea 100644
--- a/apps/Script.lua
+++ b/apps/Script.lua
@@ -1,4 +1,4 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Config = require('config')
 local Event  = require('event')
@@ -6,6 +6,12 @@ local Socket = require('socket')
 local UI     = require('ui')
 local Util   = require('util')
 
+local colors     = _G.colors
+local fs         = _G.fs
+local multishell = _ENV.multishell
+local os         = _G.os
+local shell      = _ENV.shell
+
 local GROUPS_PATH = 'usr/groups'
 local SCRIPTS_PATH = 'usr/etc/scripts'
 
@@ -26,7 +32,7 @@ if UI.term.width % 2 ~= 0 then
   width = width + 1
 end
 
-function processVariables(script)
+local function processVariables(script)
 
   local fn = loadstring('return ' .. config.variables)
   if fn then
@@ -40,7 +46,7 @@ function processVariables(script)
   return script
 end
 
-function invokeScript(computer, scriptName)
+local function invokeScript(computer, scriptName)
 
   local script = Util.readFile(scriptName)
   if not script then
@@ -74,7 +80,7 @@ function invokeScript(computer, scriptName)
   socket:close()
 end
 
-function runScript(computerOrGroup, scriptName)
+local function runScript(computerOrGroup, scriptName)
   if computerOrGroup.id then
     invokeScript(computerOrGroup, scriptName)
   else
@@ -208,14 +214,14 @@ local editorPage = UI.Page({
     y = 3,
   }),
   right = UI.Button({
-    text = '>', 
+    text = '>',
     event = 'right',
     x = width - 2,
     y = 2,
     width = 3,
   }),
   left = UI.Button({
-    text = '<', 
+    text = '<',
     event = 'left',
     x = UI.term.width - width + 1,
     y = 2,
@@ -459,11 +465,6 @@ function mainPage:eventHandler(event)
 
   elseif event.type == 'toggle' then
     config.showGroups = not config.showGroups
-    local text = 'Computers'
-    if config.showGroups then
-      text = 'Groups'
-    end
---    self.statusBar.toggleButton.text = text
     self:draw()
 
     Config.update('script', config)
diff --git a/apps/Turtles.lua b/apps/Turtles.lua
index 769929a..9cfa5a9 100644
--- a/apps/Turtles.lua
+++ b/apps/Turtles.lua
@@ -1,4 +1,4 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Config   = require('config')
 local Event    = require('event')
@@ -8,6 +8,14 @@ local Terminal = require('terminal')
 local UI       = require('ui')
 local Util     = require('util')
 
+local colors     = _G.colors
+local fs         = _G.fs
+local multishell = _ENV.multishell
+local network    = _G.network
+local os         = _G.os
+local shell      = _ENV.shell
+local term       = _G.term
+
 multishell.setTitle(multishell.getCurrent(), 'Turtles')
 UI.Button.defaults.focusIndicator = ' '
 UI:configure('Turtles', ...)
@@ -27,15 +35,7 @@ local options = {
 local SCRIPTS_PATH = 'usr/etc/scripts'
 
 local nullTerm = Terminal.getNullTerm(term.current())
-local turtles = { }
 local socket
-local policies = { 
-  { label = 'none' },
-  { label = 'digOnly' },
-  { label = 'attackOnly' },
-  { label = 'digAttack' },
-  { label = 'turtleSafe' },
-}
 
 local page = UI.Page {
   coords = UI.Window {
@@ -142,7 +142,7 @@ function page:enable(turtle)
 end
 
 function page:runFunction(script, nowrap)
-  for i = 1, 2 do
+  for _ = 1, 2 do
     if not socket then
       socket = Socket.connect(self.turtle.id, 161)
     end
@@ -186,7 +186,7 @@ function page.coords:draw()
     if not t.point.gps then
       ind = 'REL'
     end
-    self:print(string.format('%s : %d,%d,%d\n Fuel: %s\n', 
+    self:print(string.format('%s : %d,%d,%d\n Fuel: %s\n',
       ind, t.point.x, t.point.y, t.point.z, Util.toBytes(t.fuel)))
   end
 end
@@ -210,12 +210,6 @@ function page.tabs.inventory:draw()
           v.selected = true
         end
         if v.id then
---          local item = itemDB:get({ v.id, v.dmg })
---          if item then
---            v.id = item.displayName
---          else
---            v.id = v.id:gsub('.*:(.*)', '%1')
---          end
           v.id = itemDB:getName(v)
         end
       end
@@ -356,7 +350,7 @@ if not Util.getOptions(options, { ... }, true) then
 end
 
 if options.turtle.value >= 0 then
-  for i = 1, 10 do
+  for _ = 1, 10 do
     page.turtle = _G.network[options.turtle.value]
     if page.turtle then
       break
diff --git a/apps/base64dl.lua b/apps/base64dl.lua
index 203b4a1..a76f494 100644
--- a/apps/base64dl.lua
+++ b/apps/base64dl.lua
@@ -1,6 +1,10 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
-Base64 = require('base64')
+local Base64 = require('base64')
+
+local http  = _G.http
+local os    = _G.os
+local shell = _ENV.shell
 
 local args = { ... }
 
diff --git a/apps/chestManager.lua b/apps/chestManager.lua
index 82d730e..f56d367 100644
--- a/apps/chestManager.lua
+++ b/apps/chestManager.lua
@@ -1,4 +1,4 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local ChestAdapter   = require('chestAdapter18')
 local Config         = require('config')
@@ -12,6 +12,11 @@ local Terminal       = require('terminal')
 local UI             = require('ui')
 local Util           = require('util')
 
+local device     = _G.device
+local multishell = _ENV.multishell
+local peripheral = _G.peripheral
+local term       = _G.term
+
 multishell.setTitle(multishell.getCurrent(), 'Resource Manager')
 
 -- 3 wide monitor (any side of turtle)
@@ -58,6 +63,9 @@ end
 local RESOURCE_FILE = 'usr/config/resources.db'
 local RECIPES_FILE  = 'usr/etc/recipes.db'
 
+local colors = _G.colors
+local turtle = _G.turtle
+
 local craftingPaused = false
 local canCraft = not not duckAntenna or turtleChestAdapter:isValid()
 local recipes = Util.readTable(RECIPES_FILE) or { }
@@ -97,18 +105,6 @@ local function getItemQuantity(items, item)
   return 0
 end
 
-local function getItemDetails(items, item)
-  local cItem = getItem(items, item)
-  if cItem then
-    return cItem
-  end
-  cItem = itemDB:get(itemDB:makeKey(item))
-  if cItem then
-    return { count = 0, maxCount = cItem.maxCount }
-  end
-  return { count = 0, maxCount = 64 }
-end
-
 local function uniqueKey(item)
   return table.concat({ item.name, item.damage, item.nbtHash }, ':')
 end
@@ -143,12 +139,12 @@ local function mergeResources(t)
     v.lname = v.displayName:lower()
   end
 end
- 
+
 local function filterItems(t, filter)
   if filter then
     local r = {}
     filter = filter:lower()
-    for k,v in pairs(t) do
+    for _,v in pairs(t) do
       if string.find(v.lname, filter) then
         table.insert(r, v)
       end
@@ -160,7 +156,6 @@ end
 
 local function sumItems3(ingredients, items, summedItems, count)
 
-  local canCraft = 0
   for _,key in pairs(ingredients) do
     local item = splitKey(key)
     local summedItem = summedItems[key]
@@ -205,7 +200,7 @@ local function addCraftingRequest(item, craftList, count)
   local key = uniqueKey(item)
   local request = craftList[key]
   if not craftList[key] then
-    request = { name = item.name, damage = item.damage, nbtHash = nbtHash, count = 0 }
+    request = { name = item.name, damage = item.damage, nbtHash = item.nbtHash, count = 0 }
     request.displayName = itemDB:getName(request)
     craftList[key] = request
   end
@@ -238,7 +233,7 @@ local function craftItem(recipe, items, originalItem, craftList, count)
     local summedItems = { }
     sumItems3(recipe.ingredients, items, summedItems, math.ceil(count / recipe.count))
 
-    for key,ingredient in pairs(summedItems) do
+    for _,ingredient in pairs(summedItems) do
       if not ingredient.recipe and ingredient.count < 0 then
         addCraftingRequest(ingredient, craftList, -ingredient.count)
       end
@@ -270,7 +265,7 @@ local function craftItems(craftList, allItems)
         else
           local count = item.count
           while count >= 1 do -- try to request smaller quantities until successful
-            local s, m = pcall(function()
+            local s = pcall(function()
               item.status = '(no recipe)'
               if not controller:craft(item, count) then
                 item.status = '(missing ingredients)'
@@ -289,7 +284,7 @@ local function craftItems(craftList, allItems)
   end
 end
 
-local function jobMonitor(jobList)
+local function jobMonitor()
 
   local mon = Peripheral.getByType('monitor')
 
@@ -368,7 +363,7 @@ local function watchResources(items)
   local craftList = { }
   local outputs   = { }
 
-  for k, res in pairs(resources) do
+  for _,res in pairs(resources) do
     local item = getItemWithQty(items, res, res.ignoreDamage)
     if not item then
       item = {
@@ -381,8 +376,8 @@ local function watchResources(items)
     end
 
     if res.limit and item.count > res.limit then
-      local s, m = inventoryAdapter:provide(
-        { name = item.name, damage = item.damage }, 
+      inventoryAdapter:provide(
+        { name = item.name, damage = item.damage },
         item.count - res.limit,
         nil,
         config.trashDirection)
@@ -522,9 +517,9 @@ function itemPage:enable(item)
 
   local devices = self.form[6].choices
   Util.clear(devices)
-  for _,device in pairs(device) do
-    if device.setOutput then
-      table.insert(devices, { name = device.name, value = device.name })
+  for _,dev in pairs(device) do
+    if dev.setOutput then
+      table.insert(devices, { name = dev.name, value = dev.name })
     end
   end
 
@@ -564,7 +559,7 @@ function itemPage:eventHandler(event)
     if filtered.auto ~= true then
       filtered.auto = nil
     end
- 
+
     if filtered.rsControl ~= true then
       filtered.rsControl = nil
       filtered.rsSide = nil
@@ -629,9 +624,6 @@ function listingPage.grid:getRowTextColor(row, selected)
     return colors.yellow
   end
   if row.has_recipe then
-    if selected then
-      return colors.cyan
-    end
     return colors.cyan
   end
   return UI.Grid:getRowTextColor(row, selected)
@@ -705,7 +697,7 @@ function listingPage:eventHandler(event)
       self.grid:draw()
     end
 
-  elseif event.type == 'text_change' then 
+  elseif event.type == 'text_change' then
     self.filter = event.text
     if #self.filter == 0 then
       self.filter = nil
@@ -741,7 +733,7 @@ local function getTurtleInventory()
 
   if duckAntenna then
     local list = duckAntenna.getAllStacks(false)
-    for k,v in pairs(list) do
+    for _,v in pairs(list) do
       v.name = v.id
       v.damage = v.dmg
       v.displayName = v.display_name
@@ -765,22 +757,12 @@ local function getTurtleInventory()
   return inventory
 end
 
-local function filter(t, filter)
-  local keys = Util.keys(t)
-  for _,key in pairs(keys) do
-    if not Util.key(filter, key) then
-      t[key] = nil
-    end
-  end
-end
-
 local function learnRecipe(page)
-  local recipe = { }
   local ingredients = getTurtleInventory()
   if ingredients then
     turtle.select(1)
     if canCraft and turtle.craft() then
-      recipe = getTurtleInventory()
+      local recipe = getTurtleInventory()
       if recipe and recipe[1] then
         clearGrid()
 
@@ -851,7 +833,7 @@ function learnPage:disable()
   craftingPaused = false
   UI.Dialog.disable(self)
 end
- 
+
 function learnPage:eventHandler(event)
   if event.type == 'cancel' then
     UI:setPreviousPage()
@@ -902,12 +884,11 @@ function craftPage:disable()
   craftingPaused = false
   UI.Dialog.disable(self)
 end
- 
+
 function craftPage:eventHandler(event)
   if event.type == 'cancel' then
     UI:setPreviousPage()
-  elseif event.type == 'accept' then
-    
+  --elseif event.type == 'accept' then
   else
     return UI.Dialog.eventHandler(self, event)
   end
diff --git a/apps/mirror.lua b/apps/mirror.lua
index ab3c8c1..f2817d4 100644
--- a/apps/mirror.lua
+++ b/apps/mirror.lua
@@ -1,9 +1,12 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Terminal = require('terminal')
 
+local shell = _ENV.shell
+local term  = _G.term
+
 local args = { ... }
-local mon = device[table.remove(args, 1) or 'monitor']
+local mon = _G.device[table.remove(args, 1) or 'monitor']
 if not mon then
   error('mirror: Invalid device')
 end
diff --git a/apps/mirrorClient.lua b/apps/mirrorClient.lua
index 7152ee6..c3c6225 100644
--- a/apps/mirrorClient.lua
+++ b/apps/mirrorClient.lua
@@ -1,11 +1,13 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Event    = require('event')
 local Logger   = require('logger')
 local Socket   = require('socket')
-local Terminal = require('terminal')
 local Util     = require('util')
 
+local multishell = _ENV.multishell
+local os         = _G.os
+
 Logger.setScreenLogging()
 
 local remoteId
@@ -14,7 +16,7 @@ if #args == 1 then
   remoteId = tonumber(args[1])
 else
   print('Enter host ID')
-  remoteId = tonumber(read())
+  remoteId = tonumber(_G.read())
 end
 
 if not remoteId then
@@ -70,7 +72,7 @@ while true do
   while true do
     local e = Event.pullEvent()
     if e[1] == 'terminate' then
-    	break
+      break
     end
     if not socket.connected then
       break
diff --git a/apps/mirrorHost.lua b/apps/mirrorHost.lua
index 8ddefee..dbbaf25 100644
--- a/apps/mirrorHost.lua
+++ b/apps/mirrorHost.lua
@@ -1,15 +1,18 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Event  = require('event')
 local Logger = require('logger')
 local Socket = require('socket')
 
+local colors = _G.colors
+local term   = _G.term
+
 Logger.setScreenLogging()
 
 local mon = term.current()
 local args = { ... }
 if args[1] then
-  mon = device[args[1]]
+  mon = _G.device[args[1]]
 end
 
 if not mon then
diff --git a/apps/music.lua b/apps/music.lua
index d9b791b..33a7eba 100644
--- a/apps/music.lua
+++ b/apps/music.lua
@@ -1,8 +1,14 @@
-require = requireInjector(getfenv(1))
+_G.requireInjector()
 
 local Event = require('event')
 local UI    = require('ui')
 
+local colors = _G.colors
+local device = _G.device
+local turtle = _G.turtle
+
+local multishell = _ENV.multishell
+
 multishell.setTitle(multishell.getCurrent(), 'Music')
 
 local radio = device.drive or error('No drive attached')
@@ -16,8 +22,6 @@ end
 
 UI:configure('Music', ...)
 
-local monitor = UI.term
-
 UI.Button.defaults.backgroundFocusColor = colors.gray
 
 local page = UI.Page({
@@ -146,12 +150,12 @@ function page:eventHandler(event)
   end
 end
 
-function page:setVolume(volume, displayOnly)
+function page:setVolume(volume)
   volume = math.min(volume, 15)
   volume = math.max(volume, 1)
   self.volume = volume
   volume = math.ceil(volume / 2)
- 
+
   for i = 1, volume do
     self.volumeControls[i].backgroundColor =
       self.volumeControls[i].color
@@ -224,7 +228,7 @@ end
 
 function page:updateStationName()
   local title = radio.getAudioTitle()
- 
+
   if title then
     self.stationName.value = title
     self.stationName:draw()
diff --git a/apps/mwm.lua b/apps/mwm.lua
index b2e4bc8..2346ab5 100644
--- a/apps/mwm.lua
+++ b/apps/mwm.lua
@@ -1,9 +1,16 @@
 local injector = requireInjector or load(http.get('https://raw.githubusercontent.com/kepler155c/opus/master/sys/apis/injector.lua').readAll())()
-injector(getfenv(1))
+injector()
 
 local Canvas = require('ui.canvas')
 local Util   = require('util')
 
+local colors     = _G.colors
+local os         = _G.os
+local peripheral = _G.peripheral
+local shell      = _ENV.shell
+local term       = _G.term
+local window     = _G.window
+
 local function syntax()
   printError('Syntax:')
   error('mwm sessionName [monitor]')
@@ -18,7 +25,7 @@ local sessionFile = args[1] or syntax()
 local running
 local monitor
 
-local defaultEnv = Util.shallowCopy(getfenv(1))
+local defaultEnv = Util.shallowCopy(_ENV)
 defaultEnv.multishell = multishell
 
 if args[2] then
@@ -55,7 +62,7 @@ end
 local function getProcessAt(x, y)
   for k = #processes, 1, -1 do
     local process = processes[k]
-    if x >= process.x and 
+    if x >= process.x and
        y >= process.y and
        x <= process.x + process.width - 1 and
        y <= process.y + process.height - 1 then
@@ -356,7 +363,7 @@ function multishell.removeProcess(process)
   redraw()
 end
 
-function multishell.saveSession(sessionFile)
+function multishell.saveSession(filename)
   local t = { }
   for _,process in pairs(processes) do
     if process.path and not process.isShell then
@@ -370,11 +377,11 @@ function multishell.saveSession(sessionFile)
       })
     end
   end
-  Util.writeTable(sessionFile, t)
+  Util.writeTable(filename, t)
 end
 
-function multishell.loadSession(sessionFile)
-  local config = Util.readTable(sessionFile)
+function multishell.loadSession(filename)
+  local config = Util.readTable(filename)
   if config then
     for _,v in pairs(config) do
       multishell.openTab(v)
diff --git a/apps/storageActivity.lua b/apps/storageActivity.lua
index 11346bc..5065032 100644
--- a/apps/storageActivity.lua
+++ b/apps/storageActivity.lua
@@ -1,4 +1,4 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 local ChestAdapter    = require('chestAdapter18')
 local Event           = require('event')
@@ -7,6 +7,9 @@ local RefinedAdapter  = require('refinedAdapter')
 local UI              = require('ui')
 local Util            = require('util')
 
+local colors     = _G.colors
+local multishell = _ENV.multishell
+
 local storage = RefinedAdapter()
 if not storage:isValid() then
   storage = MEAdapter({ auto = true })
@@ -73,7 +76,7 @@ function changedPage.grid:getDisplayValues(row)
 end
 
 function changedPage:eventHandler(event)
- 
+
   if event.type == 'reset' then
     self.lastItems = nil
     self.grid:setValues({ })
@@ -102,22 +105,23 @@ end
 
 function changedPage:refresh()
   local t = storage:listItems()
- 
+
   if not t or Util.empty(t) then
     self:clear()
     self:centeredWrite(math.ceil(self.height/2), 'Communication failure')
     return
   end
- 
+
   for k,v in pairs(t) do
     t[k] = Util.shallowCopy(v)
   end
- 
+
   if not self.lastItems then
     self.lastItems = t
     self.grid:setValues({ })
   else
-    local changedItems = {}
+    local changedItems = { }
+    local found
     for _,v in pairs(self.lastItems) do
       found = false
       for k2,v2 in pairs(t) do
@@ -141,12 +145,12 @@ function changedPage:refresh()
       end
     end
     -- No items left
-    for k,v in pairs(t) do
+    for _,v in pairs(t) do
       v.lastCount = 0
       table.insert(changedItems, v)
     end
 
-    for k,v in pairs(changedItems) do
+    for _,v in pairs(changedItems) do
       v.change  = v.count - v.lastCount
     end
 
@@ -154,11 +158,11 @@ function changedPage:refresh()
   end
   self.grid:draw()
 end
- 
+
 Event.onInterval(5, function()
   changedPage:refresh()
   changedPage:sync()
 end)
- 
+
 UI:setPage(changedPage)
 UI:pullEvents()
diff --git a/apps/treefarm.lua b/apps/treefarm.lua
index cb0d74d..3475cf6 100644
--- a/apps/treefarm.lua
+++ b/apps/treefarm.lua
@@ -1,4 +1,4 @@
-requireInjector(getfenv(1))
+_G.requireInjector()
 
 --[[
   Requirements:
@@ -27,6 +27,10 @@ local Pathing      = require('turtle.pathfind')
 local Point        = require('point')
 local Util         = require('util')
 
+local os     = _G.os
+local read   = _G.read
+local turtle = _G.turtle
+
 local FUEL_BASE = 0
 local FUEL_DIRE = FUEL_BASE + 10
 local FUEL_GOOD = FUEL_BASE + 2000
@@ -175,7 +179,7 @@ local function makeSingleCharcoal()
 
   local slots = turtle.getSummedInventory()
 
-  if not state.furnace or 
+  if not state.furnace or
      slots[CHARCOAL] or
      not slots[OAK_LOG] or
      slots[OAK_LOG].count < 2 then
@@ -195,13 +199,13 @@ local function makeCharcoal()
 
   local slots = turtle.getSummedInventory()
 
-  if not state.furnace or 
+  if not state.furnace or
      not slots[CHARCOAL] or
      slots[CHARCOAL].count >= MIN_CHARCOAL then
     return true
   end
 
-  local function getLogSlot(slots)
+  local function getLogSlot()
     local maxslot = { count = 0 }
     for k,slot in pairs(slots) do
       if string.match(k, 'minecraft:log') then
@@ -214,7 +218,8 @@ local function makeCharcoal()
   end
 
   repeat
-    local slots    = turtle.getSummedInventory()
+    slots = turtle.getSummedInventory()
+
     local charcoal = slots[CHARCOAL].count
     local slot     = getLogSlot(slots)
 
@@ -266,7 +271,7 @@ local function getCobblestone(count)
       turtle.select(1)
       turtle.digDown()
       turtle.down()
-      for i = 1, 4 do
+      for _ = 1, 4 do
         if inspect(turtle.inspect) == STONE then
           turtle.dig()
         end
@@ -391,9 +396,9 @@ local function dropOffItems()
   if state.chest_1 then
     local slots = turtle.getSummedInventory()
 
-    if state.chest_1 and 
-       slots[CHARCOAL] and 
-       slots[CHARCOAL].count >= MIN_CHARCOAL and 
+    if state.chest_1 and
+       slots[CHARCOAL] and
+       slots[CHARCOAL].count >= MIN_CHARCOAL and
        (turtle.getItemCount('minecraft:log') > 0 or
         turtle.getItemCount('minecraft:log2') > 0) then
 
@@ -510,10 +515,10 @@ local function fell()
 
   local pts = Util.shallowCopy(state.trees)
 
-  local pt = table.remove(pts, math.random(1, #pts))
+  local rpt = table.remove(pts, math.random(1, #pts))
 
   -- give the pathfinder hints about what to avoid (state.trees)
-  if not turtle.faceAgainst(pt, { blocks = Util.shallowCopy(state.trees) }) or
+  if not turtle.faceAgainst(rpt, { blocks = Util.shallowCopy(state.trees) }) or
      not string.match(inspect(turtle.inspect), 'minecraft:log') then
     return true
   end
@@ -523,7 +528,7 @@ local function fell()
   local fuel = turtle.getFuelLevel()
 
   -- push this point to the start of this list
-  table.insert(pts, 1, pt)
+  table.insert(pts, 1, rpt)
 
   Point.eachClosest(turtle.point, pts, function(pt)
     if turtle.faceAgainst(pt, { blocks = Util.shallowCopy(state.trees) }) and
@@ -570,7 +575,7 @@ local function moreTrees()
   end)
 end
 
-function getTurtleFacing(block)
+local function getTurtleFacing(block)
   local directions = {
     [5] = 2,
     [3] = 3,
@@ -586,7 +591,7 @@ function getTurtleFacing(block)
   return directions[bi.metadata]
 end
 
-function saveTurtleFacing()
+local function saveTurtleFacing()
   if not state.facing then
     setState('facing', getTurtleFacing(CHEST))
   end
@@ -600,9 +605,9 @@ local function findGround()
     local s, block = turtle.inspectDown()
 
     if not s then block = { name = 'minecraft:air', metadata = 0 } end
-    b = block.name .. ':' .. block.metadata
+    local b = block.name .. ':' .. block.metadata
 
-    if b == 'minecraft:dirt:0' or 
+    if b == 'minecraft:dirt:0' or
        b == 'minecraft:grass:0' or
        block.name == 'minecraft:chest' then
       break
@@ -719,7 +724,7 @@ local tasks = {
   { desc = 'Placing torches',    fn = placeTorches       },
   { desc = 'Refueling',          fn = refuel             },
   { desc = 'Dropping off items', fn = dropOffItems       },
-  { desc = 'Condensing',         fn = turtle.condense    },  
+  { desc = 'Condensing',         fn = turtle.condense    },
   { desc = 'Sleeping',           fn = updateClock        },
 }
 
@@ -734,12 +739,12 @@ local s, m = turtle.run(function()
       turtle.status = task.desc
       turtle.select(1)
       if not task.fn() then
-        Util.filterInplace(tasks, function(v) return v.fn ~= task.fn end) 
+        Util.filterInplace(tasks, function(v) return v.fn ~= task.fn end)
       end
     end
   end
 end)
 
 if not s then
-  error('Failed')
+  error(m or 'Failed')
 end
diff --git a/etc/fstab.ignore b/etc/fstab.ignore
new file mode 100644
index 0000000..7c8538b
--- /dev/null
+++ b/etc/fstab.ignore
@@ -0,0 +1 @@
+forced fstab overwrite
\ No newline at end of file