Disk copy program

local function usage()
 print("Usage: clone SRC DST")
 print("SRC is the side you want to copy from.")
 print("DST is the side you want to copy to.")
 print("Sides are left, right, front, back,")
 print("top, bottom.")
end

local args = {...}

if #args ~= 2 then
 return usage()
end

local src = args[1]
local dst = args[2]

if not disk.isPresent(src) then
 return print("Source disk not present ("..src..")")
end
if not disk.isPresent(dst) then
 return print("Destination disk not present ("..dst..")")
end
if not disk.hasData(src) then
 return print("Source disk is not a data disk ("..src..")")
end
if not disk.hasData(dst) then
 return print("Destination disk is not a data disk ("..dst..")")
end

disk.setLabel(dst, disk.getLabel(src))

src = disk.getMountPath(src)
dst = disk.getMountPath(dst)

local function recursiveErase(path)
 for _,v in ipairs(fs.list(path)) do
  local path2 = path.."/"..v
  if fs.isDir(path2) then
   recursiveErase(path2)
  end
  fs.delete(path2)
 end
end

local function recursiveCopy(src, dst)
 for _,v in ipairs(fs.list(src)) do
  local src2 = src.."/"..v
  local dst2 = dst.."/"..v
  if fs.isDir(src2) then
   fs.makeDir(dst2)
   recursiveCopy(src2, dst2)
  else
   local srcf = fs.open(src2, "r")
   local dstf = fs.open(dst2, "w")
   dstf.write(srcf.readAll())
   dstf.close()
   srcf.close()
  end
 end
end

recursiveErase(dst)
recursiveCopy(src, dst)