feature: added file copier

pkg/io/files/fle_copier.go

@@ -0,0 +1,93 @@
+package files
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+func CopyDir(src, dst string) error {
+	src = filepath.Clean(src)
+	dst = filepath.Clean(dst)
+
+	si, err := os.Stat(src)
+	if err != nil {
+		return err
+	}
+	if !si.IsDir() {
+		return fmt.Errorf("source is not a directory")
+	}
+
+	_, err = os.Stat(dst)
+	if err != nil && !os.IsNotExist(err) {
+		return err
+	}
+	if err == nil {
+		return fmt.Errorf("destination already exists")
+	}
+
+	err = os.MkdirAll(dst, si.Mode())
+	if err != nil {
+		return err
+	}
+
+	entries, err := os.ReadDir(src)
+	if err != nil {
+		return err
+	}
+
+	for _, entry := range entries {
+		srcPath := filepath.Join(src, entry.Name())
+		dstPath := filepath.Join(dst, entry.Name())
+
+		if entry.IsDir() {
+			err = CopyDir(srcPath, dstPath)
+			if err != nil {
+				return err
+			}
+		} else {
+			err = CopyFile(srcPath, dstPath)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func CopyFile(src, dst string) error {
+	srcFile, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer srcFile.Close()
+
+	dstFile, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer dstFile.Close()
+
+	_, err = io.Copy(dstFile, srcFile)
+	if err != nil {
+		return err
+	}
+
+	err = dstFile.Sync()
+	if err != nil {
+		return err
+	}
+
+	si, err := os.Stat(src)
+	if err != nil {
+		return err
+	}
+	err = os.Chmod(dst, si.Mode())
+	if err != nil {
+		return err
+	}
+
+	return nil
+}