Isolated shell environments

Capy64/Assets/Lua/CapyOS/init.lua

@@ -1,4 +1,4 @@
-local version = "0.1.0"
+local version = "0.1.1"
 local systemDirectory = "/sys"
 
 print("Starting CapyOS")

Capy64/Assets/Lua/CapyOS/sys/bin/shell.lua

@@ -4,6 +4,7 @@ local fs = require("fs")
 local machine = require("machine")
 local argparser = require("argparser")
 local scheduler = require("scheduler")
+local createPackageEnvironment = require("shell.package")
 
 local exit = false
 local parentShell = shell
@@ -16,15 +17,19 @@ shell.aliases = parentShell and parentShell.aliases or {}
 
 local currentDir = parentShell and parentShell.getDir() or shell.homePath
 
-local function buildEnvironment(path, args, argf)
+local function buildEnvironment(command, filepath, args, argf)
     local arg = { table.unpack(args, 2) }
-    arg[0] = path
+    arg[0] = command
     arg.string = argf
 
+    local envPackage = createPackageEnvironment(filepath)
+    envPackage.loaded.scheduler = scheduler
+
     return setmetatable({
         shell = shell,
         arg = arg,
-    }, { __index = _G })
+        scheduler = scheduler,
+    }, { __index = envPackage.loaded._G })
 end
 
 function shell.getDir()
@@ -78,7 +83,7 @@ function shell.run(...)
         end
     end
 
-    local env = buildEnvironment(command, args, argf)
+    local env = buildEnvironment(command, path, args, argf)
 
     local func, err = loadfile(path, "t", env)
 
@@ -90,11 +95,13 @@ function shell.run(...)
     local ok, err
     local function run()
         ok, err = pcall(func, table.unpack(args, 2))
-        
     end
 
-    local programTask = scheduler.spawn(run)
+    local programTask, yielded = scheduler.spawn(run)
+
+    if yielded then
         coroutine.yield("scheduler_task_end")
+    end
 
     if not ok then
         io.stderr.print(err)

Capy64/Assets/Lua/CapyOS/sys/lib/scheduler.lua

@@ -55,39 +55,6 @@ local function findParent()
     return nil
 end
 
-function scheduler.spawn(func, options)
-    expect(1, func, "function")
-    expect(2, options, "nil", "table")
-
-    options = options or {}
-    options.args = options.args or {}
-
-    local source = debug.getinfo(2)
-
-    local task = newTask()
-    local pid = #tasks + 1
-    task.pid = pid
-    task.options = options
-    task.source = source.source
-    task.uuid = tostring(func)
-    task.thread = coroutine.create(func)
-    task.started = false
-    local parent = findParent()
-    if parent then
-        task.parent = parent.pid
-        table.insert(parent.children, pid)
-    end
-    task.filters = {}
-    task.children = {}
-    task.eventQueue = {}
-
-    tasks[pid] = task
-
-    processes = processes + 1
-
-    return task
-end
-
 local function cascadeKill(pid, err)
     local task = tasks[pid]
     if not task then
@@ -116,6 +83,50 @@ local function cascadeKill(pid, err)
     end
 end
 
+local function resumeTask(task, yieldPars)
+    local pars = table.pack(coroutine.resume(task.thread, table.unpack(yieldPars)))
+    if pars[1] then
+        task.filters = table.pack(table.unpack(pars, 2))
+        return coroutine.status(task.thread) ~= "dead"
+    else
+        cascadeKill(task.pid, pars[2])
+        return false
+    end
+end
+
+function scheduler.spawn(func, options)
+    expect(1, func, "function")
+    expect(2, options, "nil", "table")
+
+    options = options or {}
+    options.args = options.args or {}
+
+    local source = debug.getinfo(2)
+
+    local task = newTask()
+    local pid = #tasks + 1
+    task.pid = pid
+    task.options = options
+    task.source = source.source
+    task.uuid = tostring(func)
+    task.thread = coroutine.create(func)
+    local parent = findParent()
+    if parent then
+        task.parent = parent.pid
+        table.insert(parent.children, pid)
+    end
+    task.filters = {}
+    task.children = {}
+    task.eventQueue = {}
+    task.skip = true
+
+    tasks[pid] = task
+
+    processes = processes + 1
+
+    return task, resumeTask(task, task.options.args)
+end
+
 function scheduler.kill(pid)
     expect(1, pid, "number")
     cascadeKill(pid)
@@ -146,15 +157,10 @@ function scheduler.init()
                 yieldPars = table.pack(table.unpack(ev, 3))
             end
             if yieldPars[1] ~= "scheduler" and not task.filters or #task.filters == 0 or contains(task.filters, yieldPars[1]) or yieldPars[1] == "interrupt" then
-                if not task.started then
+                if task.skip then
-                    yieldPars = task.options.args
+                    task.skip = false
-                    task.started = true
-                end
-                local pars = table.pack(coroutine.resume(task.thread, table.unpack(yieldPars)))
-                if pars[1] then
-                    task.filters = table.pack(table.unpack(pars, 2))
                 else
-                    cascadeKill(pid, pars[2])
+                    resumeTask(task, yieldPars)
                 end
             end
 

Capy64/Assets/Lua/CapyOS/sys/lib/shell/package.lua

@@ -0,0 +1,112 @@
+local expect = require("expect").expect
+local fs = require("fs")
+local nativePackage = package
+
+local function copyTable(source, target)
+    target = target or {}
+
+    for k, v in pairs(source) do
+        target[k] = v
+    end
+
+    return target
+end
+
+local hostPackages = copyTable(nativePackage._host)
+
+local function createPreloadSearcher(envPackage)
+    return function(name)
+        if not envPackage.preload[name] then
+            return string.format("no field package.preload['%s']", name)
+        end
+        return envPackage.preload[name], ":preload:"
+    end
+end
+
+local function createLoaderSearcher(envPackage)
+    return function(name)
+        local path, err = envPackage.searchpath(name, envPackage.path)
+
+        if not path then
+            return err
+        end
+
+        local func, err = loadfile(path)
+        if not func then
+            return string.format("error loading module '%s' from file '%s':\t%s", name, path, err)
+        end
+
+        return func, path
+    end
+end
+
+local function createEnvironment(filePath)
+    local envPackage = {
+        cpath = nativePackage.cpath,
+        searchpath = nativePackage.searchpath,
+        config = nativePackage.config,
+        searchers = {},
+        loaded = {},
+        preload = {},
+    }
+
+    local dirName = fs.getDir(filePath)
+    --envPackage.path = string.format("%s/?.lua;%s/?/init.lua;", dirName, dirName) .. nativePackage.path
+    envPackage.path = nativePackage.path
+
+    envPackage.searchers[1] = createPreloadSearcher(envPackage)
+    envPackage.searchers[2] = createLoaderSearcher(envPackage)
+
+    local function envRequire(modname)
+        expect(1, modname, "string", "number")
+        modname = tostring(modname)
+    
+        if envPackage.loaded[modname] then
+            return envPackage.loaded[modname]
+        end
+    
+        local errorOutput = ""
+        local libFunction, libPath
+        for i = 1, #envPackage.searchers do
+            local par, path = envPackage.searchers[i](modname)
+            if type(par) == "function" then
+                libFunction, libPath = par, path
+                break
+            else
+                errorOutput = errorOutput .. "\n\t" .. par
+            end
+        end
+    
+        if not libFunction then
+            error(string.format("module '%s' not found:%s", modname, errorOutput), 2)
+        end
+    
+        local ok, par = pcall(libFunction)
+        if not ok then
+            error(par, 0)
+        end
+    
+        if par == nil then
+            envPackage.loaded[modname] = true
+            return true
+        end
+    
+        envPackage.loaded[modname] = par
+    
+        return par, libPath
+    end
+
+    copyTable(hostPackages, envPackage.loaded)
+    envPackage.loaded.package = envPackage
+
+    local env_G = copyTable(envPackage.loaded._G or _G)
+    envPackage.loaded._G = env_G
+    env_G._G = env_G
+
+    envPackage.loaded._G.package = envPackage
+    envPackage.loaded._G.require = envRequire
+
+    return envPackage, envRequire
+end
+
+return createEnvironment

Capy64/Assets/Lua/bios.lua

@@ -177,7 +177,7 @@ local function bootScreen()
 	term.setPos(1,2)
 	writeCenter("Capy64")
 	term.setPos(1,4)
-	writeCenter("Powered by Capybaras")
+	writeCenter("(c) 2023 AlexDevs")
 
 	term.setPos(1, h - 1)
 	writeCenter("Press F2 to open setup")

Capy64/Runtime/RuntimeManager.cs

@@ -136,6 +136,7 @@ internal class RuntimeManager : IComponent
         luaState = new LuaState();
         _game.LuaRuntime = luaState;
         luaState.Init();
+        CopyHostLibraries();
 
         emitter = new(_game.EventEmitter, luaState);
 
@@ -162,6 +163,26 @@ internal class RuntimeManager : IComponent
         }
     }
 
+    private void CopyHostLibraries()
+    {
+        // table that will contain host libraries
+        luaState.Thread.NewTable();
+
+        luaState.Thread.GetGlobal("package");
+        luaState.Thread.GetField(-1, "loaded");
+
+        luaState.Thread.PushNil();
+        while (luaState.Thread.Next(-2))
+        {
+            var libname = luaState.Thread.ToString(-2);
+            luaState.Thread.SetField(1, libname);
+        }
+
+        luaState.Thread.Rotate(1, -1);
+        luaState.Thread.SetField(1, "_host");
+        luaState.Thread.SetTop(0);
+    }
+
     private void LoadFirmware()
     {
         var firmwareContent = File.ReadAllText(Path.Combine(Capy64.AssetsPath, "Lua/firmware.lua"));