aceVM/disks/1h/sys/kernel/filesystem.sys

-- Copyright (C) 2025 ASTRONAND
-- File open modes
-- M  | H | D
-- rc | r | Read and close
-- r  | r | Read
-- w  | w | Write
-- o  | w | Overite file
-- om | m | Overite and modify
-- rw | m | Read and write
-- x  | f | get function

local args=({...})[1]
local fs={}
local disks={}
local mounts={}
local bootDrive=args.bootDrive
local auth=args.auth
local log=args.logging

for t, o in component.list() do
    if t=="disk" then
        if o.id==bootDrive.id then
        else disks[o.id]=o end
    end
end

local function resolve(path)
    if string.sub(path,1,1)~="/" then
        path="/"..path
    end
    local drive=bootDrive
    for i,v in pairs(mounts) do
        if string.hasPrefix(path,v) then
            drive=disks[i]
            path=string.getSuffix(path,v)
            break
        end
    end
    return drive, path
end

local function checkPerms(path, mode)

end

local function getHandle(backing,typ,clear)
    local ret={}
    local close=false
    ret.close=function()
        close=true
    end
    if typ=="r" then
        ret.read=function()
            if close then return "Handle closed" end
            return backing.read()
        end
        ret.lines=function()
            if close then error() end
            local lines=string.split(backing.read(), "\n")
            local i=0
            return function()
                i=i+1
                return lines[i]
            end
        end
    elseif typ=="w" then
        ret.write=function(data)
            if close then return "Handle closed" end
            backing.append(data)
        end
    elseif typ=="m" then
        ret.read=function()
            if close then return "Handle closed" end
            return backing.read()
        end
        ret.lines=function()
            if close then error() end
            local lines=string.split(backing.read(), "\n")
            local i=0
            return function()
                i=i+1
                return lines[i]
            end
        end
        ret.write=function(data)
            if close then return "Handle closed" end
            backing.append(data)
        end
    end
    if clear then
        ret.clear=function()
            if close then return "Handle closed" end
            backing.write()
        end
    end
    return ret
end

local function open(path, mode, arg, pc)
    if pc then
        checkPerms(path, mode)
    end
    local drive, newPath = resolve(path)
    if drive:directoryExists(newPath) then error("Cannot open directory") end
    if not drive:fileExists(newPath) then error("File does not exist") end
    local backing=drive:open(newPath)
    if mode=="rc" then
        local file=getHandle(backing,"r")
        local text=file.read()
        file.close()
        return text
    elseif mode=="r" then
        return getHandle(backing,"r")
    elseif mode=="w" then
        return getHandle(backing,"w")
    elseif mode=="o" then
        local file=getHandle(backing,"w",true)
        file.clear()
        file.clear=nil
        return file
    elseif mode=="om" then
        local file=getHandle(backing,"m",true)
        file.clear()
        file.clear=nil
        return file
    elseif mode=="rw" then
        return getHandle(backing,"m")
    elseif mode=="x" then
        local file=getHandle(backing,"r")
        local text=file.read()
        file.close()
        return load(text, path, nil, table.deepcopy(_G))
    elseif mode=="xe" then
        local file=getHandle(backing,"r")
        local text=file.read()
        file.close()
        return load(text, path, nil, arg)
    else
        error("Invailid mode")
    end
end

function fs.open(path, mode, arg)
    return open(path, mode, arg, true)
end

function fs.copy(orig, dest)
    local destFile = fs.open(dest,"o")
    local origFile = fs.open(orig, "rc")
    destFile.write(origFile)
    destFile.close()
end

function fs.move(orig, dest)
    local destFile = fs.open(dest,"o")
    local origFile = fs.open(orig, "rc")
    destFile.write(origFile)
    destFile.close()
    fs.delete(orig)
end

-- This fixes the weirdest bug ever
local isDir = function(path, pc)
    if pc then checkPerms(path, "r") end
    local drive, newPath = resolve(path)
    return drive:directoryExists(newPath)
end

local exists = function(path, pc)
    if pc then checkPerms(path, "r") end
    local drive, newPath = resolve(path)
    return ((drive:directoryExists(newPath)) or (drive:fileExists(newPath)))
end

local delete = function(path, pc)
    if pc then checkPerms(path, "w") end
    local drive, newPath = resolve(path)
    return drive:delete(newPath)
end

local list = function(path, pc)
    if pc then checkPerms(path, "w") end
    local drive, newPath = resolve(path)
    return drive:list(newPath)
end

function fs.list(path)
    return list(path, true)
end

function fs.isDir(path)
    return isDir(path, true)
end

function fs.exists(path)
    return exists(path, true)
end

function fs.delete(path)
    return delete(path, true)
end

function fs.getSudo(key)
    if auth.sudo.isAproved(key) then
        return {
            createVirtDisk=function(virtualDiskName,virtualDiskObj)
                disks[virtualDiskName]=virtualDiskObj
                log.log("Created VirtIO disk named "..virtualDiskName)
            end,
            mount=function(hardwareDir,path)
                mounts[hardwareDir]=path
                log.log("Mounted disk ")
            end,
            unmount=function(hardwareDir)
                mounts[hardwareDir]=nil
            end,
            eject=function(hardwareDir)
                disks[hardwareDir]=nil
            end,
            sfs={
                open=function(path, mode, arg)
                    return open(path, mode, arg)
                end,
                delete=function(path)
                    return delete(path)
                end,
                copy=fs.copy,
                move=fs.move,
                exists=function(path)
                    return exists(path)
                end,
                isDir=function(path)
                    return isDir(path)
                end,
                list=function(path)
                    return list(path)
                end
            }
        }
    else
        error("sudo request denied")
    end
end

return fs