OC-PsychOS2/module/fs.lua

136 lines
3.6 KiB
Lua

do
fs = {}
local fsmounts = {}
-- basics
function fs.segments(path) -- splits *path* on each /
local segments = {}
for segment in path:gmatch("[^/]+") do
segments[#segments+1] = segment
end
return segments
end
function fs.resolve(path) -- resolves *path* to a specific filesystem mount and path
if not path or path == "." then path = os.getenv("PWD") end
if path:sub(1,1) ~= "/" then path=(os.getenv("PWD") or "").."/"..path end
local segments, rpath, rfs= fs.segments(path)
local rc = #segments
for i = #segments, 1, -1 do
if fsmounts[table.concat(segments, "/", 1, i)] ~= nil then
return table.concat(segments, "/", 1, i), table.concat(segments, "/", i+1)
end
end
return "/", table.concat(segments,"/")
end
-- generate some simple functions
for k,v in pairs({"makeDirectory","exists","isDirectory","list","lastModified","remove","size","spaceUsed","spaceTotal","isReadOnly","getLabel"}) do
fs[v] = function(path)
local fsi,path = fs.resolve(path)
return fsmounts[fsi][v](path)
end
end
local function fread(self,length)
if length == "*a" then
length = math.huge
end
if type(length) == "number" then
local rstr, lstr = "", ""
repeat
lstr = fsmounts[self.fs].read(self.fid,math.min(2^16,length-rstr:len())) or ""
rstr = rstr .. lstr
until rstr:len() == length or lstr == ""
return rstr
end
return fsmounts[self.fs].read(self.fid,length)
end
local function fwrite(self,data)
fsmounts[self.fs].write(self.fid,data)
end
local function fseek(self,dist)
fsmounts[self.fs].seek(self.fid,dist)
end
local function fclose(self)
fsmounts[self.fs].close(self.fid)
end
function fs.open(path,mode) -- opens file *path* with mode *mode*
mode = mode or "rb"
local fsi,path = fs.resolve(path)
if not fsmounts[fsi] then return false end
local fid = fsmounts[fsi].open(path,mode)
if fid then
local fobj = {["fs"]=fsi,["fid"]=fid,["seek"]=fseek,["close"]=fclose}
if mode:find("r") then
fobj.read = fread
end
if mode:find("w") then
fobj.write = fwrite
end
return fobj
end
return false
end
function fs.copy(from,to) -- copies a file from *from* to *to*
local of = fs.open(from,"rb")
local df = fs.open(to,"wb")
if not of or not df then
return false
end
df:write(of:read("*a"))
df:close()
of:close()
end
function fs.rename(from,to) -- moves file *from* to *to*
local ofsi, opath = fs.resolve(from)
local dfsi, dpath = fs.resolve(to)
if ofsi == dfsi then
fsmounts[ofsi].rename(opath,dpath)
return true
end
fs.copy(from,to)
fs.remove(from)
return true
end
function fs.mount(path,proxy) -- mounts the filesystem *proxy* to the mount point *path* if it is a directory. BYO proxy.
if fs.isDirectory(path) then
fsmounts[table.concat(fs.segments(path),"/")] = proxy
return true
end
return false, "path is not a directory"
end
function fs.mounts() -- returns a table containing the mount points of all mounted filesystems
local rt = {}
for k,v in pairs(fsmounts) do
rt[#rt+1] = k,v.address or "unknown"
end
return rt
end
function fs.address(path) -- returns the address of the filesystem at a given path, if applicable
local fsi,_ = fs.resolve(path)
return fsmounts[fsi].address
end
function fs.type(path) -- returns the component type of the filesystem at a given path, if applicable
local fsi,_ = fs.resolve(path)
return fsmounts[fsi].type
end
fsmounts["/"] = component.proxy(computer.tmpAddress())
fs.makeDirectory("temp")
if computer.getBootAddress then
fs.makeDirectory("boot")
fs.mount("boot",component.proxy(computer.getBootAddress()))
end
for addr, _ in component.list("filesystem") do
fs.makeDirectory(addr:sub(1,3))
fs.mount(addr:sub(1,3),component.proxy(addr))
end
end