Expected String

I was working on a partitioning program, and I ran into a minor error, although I cant solve it due to my lacking debugging skills. On another note, if you have any tips or advice for debugging it would be greatly appreciated.

Error: qpart:28: Expected string

--[[
  qPart
--]]
if not fs.exists("/.qpart-dat") then
  local dat = { }
  dat["primary"] = "/primary"
  for k, v in pairs(fs.list("/")) do
    if v:find("disk") then
	  dat[v] = "/"..v
    end
  end
  local file = fs.open("/.qpart-dat", "w")
  file.write(textutils.serialize(dat))
  file.close()  
end
local file = fs.open("/.qpart-dat", "r")
local dat = file.readAll()
dat = textutils.unserialize(dat)
file.close()
print(textutils.serialize(dat))
for k, v in pairs(dat) do
  print(v)
  print(dat.v)
  if fs.isDir(dat[v]) == nil then
    fs.makeDir(v)
  end
end
for j, h in pairs(fs.list("/")) do
  if fs.isDir(h) then
    if not dat[h] then
	  if h ~= "rom" then
	    fs.delete(h)
	  end
    end
  end
end

I tested it. Error for me is at line 24
I fixed the error

--[[
  qPart
--]]
if not fs.exists("/.qpart-dat") then
  local dat = { }
  dat["primary"] = "/primary"
  for k, v in pairs(fs.list("/")) do
	if v:find("disk") then
		  dat[v] = "/"..v
	end
  end
  local file = fs.open("/.qpart-dat", "w")
  file.write(textutils.serialize(dat))
  file.close()
end
local file = fs.open("/.qpart-dat", "r")
local dat = file.readAll()
dat = textutils.unserialize(dat)
file.close()
print(textutils.serialize(dat))
for k, v in pairs(dat) do
  print(v)
  print(dat.v)
  if fs.isDir(v) == nil then
	fs.makeDir(v)
  end
end
for j, h in pairs(fs.list("/")) do
  if fs.isDir(h) then
	if not dat[h] then
		  if h ~= "rom" then
			fs.delete(h)
		  end
	end
  end
end

What had happened was you tried to call "dat[v]" which is the value not the key, and since you are iterating through "dat", you can just use fs.exists(v) instead of fs.exists(dat)

Requiem of Silence is correct. A couple suggestions though.
1. fs.makeDir already does nothing if the folder exists. Skip the check.

--make missing dirs
for _,path in pairs(dat) do
fs.makeDir(path)
end

2. If you're planning on using saved disk paths, your code is fine. If youre just whitelisting them to prevent an error, try pcall.
Delete all folders. Rom and disks are protected and pcall catches the 'access denied' errors when trying it.

--delete unsaved folders
for _,h in pairs(fs.list("/")) do
if fs.isDir(h) and not dat[h] then
local status,err=pcall(fs.delete,h)     
end
end

Good luck

safetyscissors, on 09 January 2015 - 09:37 AM said:

Requiem of Silence is correct. A couple suggestions though.
1. fs.makeDir already does nothing if the folder exists. Skip the check.

--make missing dirs
for _,path in pairs(dat) do
fs.makeDir(path)
end

2. If you're planning on using saved disk paths, your code is fine. If youre just whitelisting them to prevent an error, try pcall.
Delete all folders. Rom and disks are protected and pcall catches the 'access denied' errors when trying it.

--delete unsaved folders
for _,h in pairs(fs.list("/")) do
if fs.isDir(h) and not dat[h] then
local status,err=pcall(fs.delete,h)     
end
end

Good luck

Instead of calling fs.delete in a pcall (which is actually not a bad idea) you could check that the folder/file you are trying to delete is not read-only (fs.isReadOnly( path )).

The concept was to remove partitions in case it was created on the disk and then they removed it.