remove the temporary source file if we copied byte by byte.
Burcu Dogan
9 years ago
| 59 | 59 | } |
| 60 | 60 | |
| 61 | 61 | func copy(src, dest string) error { |
| 62 | // Try to rename generated source ... | |
| 62 | // Try to rename generated source. | |
| 63 | 63 | if err := os.Rename(src, dest); err == nil { |
| 64 | 64 | return nil |
| 65 | 65 | } |
| 66 | ||
| 67 | // ... if the rename failed (might do so due to temporary file residing on a | |
| 68 | // different device) try to copy byte by byte. | |
| 69 | ||
| 66 | // If the rename failed (might do so due to temporary file residing on a | |
| 67 | // different device), try to copy byte by byte. | |
| 70 | 68 | rc, err := os.Open(src) |
| 71 | 69 | if err != nil { |
| 72 | 70 | return err |
| 73 | 71 | } |
| 74 | defer rc.Close() | |
| 72 | defer func() { | |
| 73 | rc.Close() | |
| 74 | os.Remove(src) // ignore the error, source is in tmp. | |
| 75 | }() | |
| 75 | 76 | |
| 76 | 77 | if _, err = os.Stat(dest); !os.IsNotExist(err) { |
| 77 | 78 | return fmt.Errorf("file %q already exists", dest) |
| 85 | 86 | |
| 86 | 87 | if _, err = io.Copy(wc, rc); err != nil { |
| 87 | 88 | // Delete remains of failed copy attempt. |
| 88 | _ = os.Remove(dest) | |
| 89 | os.Remove(dest) | |
| 89 | 90 | } |
| 90 | 91 | return err |
| 91 | 92 | } |