112 lines
2.0 KiB
Go
112 lines
2.0 KiB
Go
package utils
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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"syscall"
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)
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// Move moves src to dst, including across filesystems.
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// It first tries os.Rename; if that fails because src and dst are on different
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// devices (EXDEV), it falls back to a recursive copy followed by removal of src.
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func Move(src, dst string) error {
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if err := os.Rename(src, dst); err == nil {
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return nil
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} else if !isCrossDeviceErr(err) {
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return err
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}
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info, err := os.Stat(src)
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if err != nil {
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return err
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}
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if info.IsDir() {
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return moveDir(src, dst)
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}
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return moveFile(src, dst, info)
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}
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func isCrossDeviceErr(err error) bool {
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if linkErr, ok := err.(*os.LinkError); ok {
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return linkErr.Err == syscall.EXDEV
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}
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return false
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}
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func moveFile(src, dst string, info os.FileInfo) error {
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if err := copyFile(src, dst, info.Mode()); err != nil {
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return err
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}
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return os.Remove(src)
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}
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func copyFile(src, dst string, mode os.FileMode) error {
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in, err := os.Open(src)
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if err != nil {
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return err
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}
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defer in.Close()
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out, err := os.OpenFile(dst, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, mode)
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if err != nil {
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return err
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}
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_, err = io.Copy(out, in)
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closeErr := out.Close()
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if err != nil {
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return err
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}
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return closeErr
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}
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func moveDir(src, dst string) error {
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if err := copyDir(src, dst); err != nil {
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return err
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}
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return os.RemoveAll(src)
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}
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func copyDir(src, dst string) error {
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srcInfo, err := os.Stat(src)
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if err != nil {
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return err
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}
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if !srcInfo.IsDir() {
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return fmt.Errorf("source is not a directory: %s", src)
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}
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if err := os.MkdirAll(dst, srcInfo.Mode()); err != nil {
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return err
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}
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entries, err := os.ReadDir(src)
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if err != nil {
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return err
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}
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for _, entry := range entries {
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srcPath := filepath.Join(src, entry.Name())
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dstPath := filepath.Join(dst, entry.Name())
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info, err := entry.Info()
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if err != nil {
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return err
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}
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if entry.IsDir() {
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if err := copyDir(srcPath, dstPath); err != nil {
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return err
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}
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} else {
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if err := copyFile(srcPath, dstPath, info.Mode()); err != nil {
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return err
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}
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}
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}
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return nil
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}
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