incredible-go-core/pkg/io/files/fle_copier.go

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
}