doing lua functions for build files, to run only in afero.FS

internal/build/lua.go

@@ -0,0 +1,116 @@
+package build
+
+import (
+	"os"
+	"strings"
+
+	lua "github.com/yuin/gopher-lua"
+)
+
+func (container Container) lRemove(L *lua.LState) int {
+	filename := L.CheckString(1)
+
+	err := container.FS.RemoveAll(filename)
+	if err != nil {
+		L.Push(lua.LFalse)
+		L.Push(lua.LString(err.Error()))
+		return 2
+	}
+	L.Push(lua.LTrue)
+	L.Push(lua.LNil)
+	return 2
+}
+
+func (container Container) lRename(L *lua.LState) int {
+	oldname := L.CheckString(1)
+	newname := L.CheckString(2)
+
+	if err := container.FS.Rename(oldname, newname); err != nil {
+		L.Push(lua.LFalse)
+		L.Push(lua.LString(err.Error()))
+		return 2
+	}
+
+	L.Push(lua.LTrue)
+	return 1
+}
+func (container Container) lCopy(L *lua.LState) int {
+	oldname := L.CheckString(1)
+	newname := L.CheckString(2)
+
+	if err := container.copyContainer(oldname, newname); err != nil {
+		L.Push(lua.LFalse)
+		L.Push(lua.LString(err.Error()))
+		return 2
+	}
+
+	L.Push(lua.LTrue)
+	L.Push(lua.LNil)
+	return 2
+
+}
+
+func modeFlags(mode string) int {
+	switch mode {
+	case "r", "rb":
+		return os.O_RDONLY
+	case "w", "wb":
+		return os.O_CREATE | os.O_WRONLY | os.O_TRUNC
+	case "a", "ab":
+		return os.O_CREATE | os.O_WRONLY | os.O_APPEND
+	case "r+", "r+b", "rb+", "br+":
+		return os.O_RDWR
+	case "w+", "w+b", "wb+", "bw+":
+		return os.O_CREATE | os.O_RDWR | os.O_TRUNC
+	case "a+", "a+b", "ab+", "ba+":
+		return os.O_CREATE | os.O_RDWR | os.O_APPEND
+	default:
+		return os.O_RDONLY
+	}
+}
+
+func (container Container) lOpen(L *lua.LState) int {
+	path := L.CheckString(1)
+	mode := L.OptString(2, "r")
+
+	file, err := container.FS.OpenFile(path, modeFlags(mode), 0644)
+	if err != nil {
+		L.Push(lua.LNil)
+		L.Push(lua.LString(err.Error()))
+		return 2
+	}
+
+	ud := L.NewUserData()
+	ud.Value = file
+	L.SetMetatable(ud, L.GetTypeMetatable("file"))
+	L.Push(ud)
+	L.Push(lua.LNil)
+	return 2
+}
+
+func (container Container) lMkdir(L *lua.LState) int {
+	path := L.CheckString(1)
+	perm := L.CheckInt(2)
+
+	if err := container.FS.MkdirAll(path, os.FileMode(perm)); err != nil {
+		L.Push(lua.LFalse)
+		L.Push(lua.LString(err.Error()))
+		return 2
+	}
+
+	L.Push(lua.LTrue)
+	L.Push(lua.LNil)
+	return 2
+}
+
+func (container Container) lexecute(L *lua.LState) {
+	cmdString := L.CheckString(1)
+
+	cmdSlice := strings.Fields(cmdString)
+}
+
+func (container Container) GetLuaState() error {
+
+	lua.NewState(lua.Options{})
+	return nil
+}

internal/build/main.go

@@ -33,11 +33,11 @@ func NewContainer(Root string, dataDir string, manifest configs.Manifest) (Conta
 		return Container{}, err
 	}
 
-	if err := container.FS.MkdirAll("/usr/bin", 0777); err != nil {
+	if err := container.FS.MkdirAll(BinDir, 0777); err != nil {
 		return Container{}, err
 	}
 
-	if err := afero.Symlinker.SymlinkIfPossible(container.FS.(afero.Symlinker), "/usr/bin", "/bin"); err != nil {
+	if err := afero.Symlinker.SymlinkIfPossible(container.FS.(afero.Symlinker), BinDir, SymLinkBinDir); err != nil {
 		return Container{}, err
 	}
 

internal/build/specs.go

@@ -0,0 +1,6 @@
+package build
+
+const (
+	BinDir        = "/usr/bin"
+	SymLinkBinDir = "/bin"
+)

internal/build/utils.go

@@ -0,0 +1,79 @@
+package build
+
+import (
+	"io"
+	"path/filepath"
+
+	"github.com/spf13/afero"
+)
+
+func (container Container) copyContainer(src string, dest string) error {
+	stats, err := container.FS.Stat(src)
+	if err != nil {
+		return err
+	}
+
+	if stats.IsDir() {
+		files, err := afero.ReadDir(container.FS, src)
+		if err != nil {
+			return err
+		}
+
+		if err := container.FS.MkdirAll(dest, 0755); err != nil {
+			return err
+		}
+
+		for _, file := range files {
+			srcPath := filepath.Join(src, file.Name())
+			destPath := filepath.Join(dest, file.Name())
+
+			if file.IsDir() {
+				if err := container.CopyHostToContainer(srcPath, destPath); err != nil {
+					return err
+				}
+				continue
+			}
+
+			if err := container.copySingleFileLtoL(srcPath, destPath); err != nil {
+				return err
+			}
+		}
+	} else {
+		if err := container.copySingleFileLtoL(src, dest); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (container Container) copySingleFileLtoL(source string, destination string) error {
+	src, err := container.FS.Open(source)
+	if err != nil {
+		return err
+	}
+	defer src.Close()
+
+	stats, err := src.Stat()
+	if err != nil {
+		return err
+	}
+	if err := container.FS.MkdirAll(filepath.Dir(destination), 0755); err != nil {
+		return err
+	}
+	dst, err := container.FS.Create(destination)
+	if err != nil {
+		return err
+	}
+	defer dst.Close()
+
+	if _, err := io.Copy(dst, src); err != nil {
+		return err
+	}
+
+	if err := container.FS.Chmod(destination, stats.Mode()); err != nil {
+		return err
+	}
+
+	return nil
+}