creating new build system

internal/build/main.go

@@ -0,0 +1,129 @@
+package build
+
+import (
+	"io"
+	"os"
+	"packets/configs"
+	utils_lua "packets/internal/utils/lua"
+	"path/filepath"
+
+	"github.com/spf13/afero"
+	lua "github.com/yuin/gopher-lua"
+)
+
+type Container struct {
+	Root     string
+	FS       afero.Fs
+	DataDir  string
+	Manifest configs.Manifest
+}
+
+func NewContainer(Root string, dataDir string, manifest configs.Manifest) (Container, error) {
+
+	var container Container
+	baseFs := afero.NewOsFs()
+	fileSystem := afero.NewBasePathFs(baseFs, Root)
+
+	container.Root = Root
+	container.Manifest = manifest
+	container.DataDir = dataDir
+	container.FS = fileSystem
+
+	if err := container.CopyHostToContainer(dataDir, "/data"); err != nil {
+		return Container{}, err
+	}
+
+	if err := container.FS.MkdirAll("/usr/bin", 0777); err != nil {
+		return Container{}, err
+	}
+
+	if err := afero.Symlinker.SymlinkIfPossible(container.FS.(afero.Symlinker), "/usr/bin", "/bin"); err != nil {
+		return Container{}, err
+	}
+
+	return container, nil
+}
+
+func (container Container) CopyHostToContainer(src string, dest string) error {
+	stats, err := os.Stat(src)
+	if err != nil {
+		return err
+	}
+
+	if stats.IsDir() {
+		files, err := os.ReadDir(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.copySingleFile(srcPath, destPath); err != nil {
+				return err
+			}
+		}
+	} else {
+		if err := container.copySingleFile(src, dest); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (container Container) copySingleFile(source string, destination string) error {
+	src, err := os.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
+}
+
+func (container Container) RunBuild() error {
+
+	L, err := utils_lua.GetSandBox()
+	if err != nil {
+		return err
+	}
+
+	L.SetGlobal("data_dir", lua.LString(container.DataDir))
+	L.SetGlobal("script", lua.LString(container.Manifest.Hooks.Build))
+
+	return nil
+}