Updater V2

function udprog(updateprogram, pastelink, udloc, updatefunargs, startupls)
updateloop = 0
--fupdateargs = {...}
updateargs = updatefunargs
os.loadAPI("/rom/programs/shell.lua")
while true do
    if fs.isDir(udloc) == false then
        fs.makeDir(udloc)
    end
    shell.shell.run("cd", udloc)


    if fs.exists(updateprogram.."new") then
        shell.shell.run("delete",updateprogram.."new")
    end
    shell.shell.run("pastebin","get",pastelink,updateprogram.."new")
    if fs.exists(updateprogram.."new") then
        if fs.exists(updateprogram.."old") then
            shell.shell.run("delete",updateprogram.."old")
        end
        if fs.exists("Farm") then
            shell.shell.run("rename",updateprogram,updateprogram.."old")
        end
        shell.shell.run("rename",updateprogram.."new",updateprogram)
        if fs.exists(updateprogram) then
            break
        end
    end
    if fs.exists(updateprogram) then
        if updateloop > 20 then
            break
        end
    end
    if fs.exists(updateprogram.."old") then
        if updateloop > 30 then
            shell.shell.run("rename",updateprogram.."old",updateprogram)
            if fs.exists(updateprogram) then
                break
            end
        end
    end
    updateloop = updateloop + 1
end
local _, countsl = string.gsub(udloc,"/","")
countsl = countsl + 1

if startupls ~= "none" or startupls ~= nil then
    local stu = fs.open("startup.lua", "w")
    stu.write(startupls)
    stu.close()
end
if updatefunargs ~= nil or updatefunargs ~= "none" then
    shell.shell.run(updateprogram .. "," .. unpack(updateargs))
else
    shell.shell.run(updateprogram)
end
for i=1,countsl do
    shell.shell.run("cd", "..")
end
end