| 54 | } |
| 55 | |
| 56 | func (o *compactOptions) Run(cmd *cobra.Command, srcPath string) (err error) { |
| 57 | |
| 58 | // ensure source file exists. |
| 59 | fi, err := checkSourceDBPath(srcPath) |
| 60 | if err != nil { |
| 61 | return err |
| 62 | } |
| 63 | initialSize := fi.Size() |
| 64 | |
| 65 | // open source database. |
| 66 | src, err := bolt.Open(srcPath, 0400, &bolt.Options{ReadOnly: true}) |
| 67 | if err != nil { |
| 68 | return err |
| 69 | } |
| 70 | defer src.Close() |
| 71 | |
| 72 | // open destination database. |
| 73 | dst, err := bolt.Open(o.dstPath, fi.Mode(), &bolt.Options{NoSync: o.dstNoSync}) |
| 74 | if err != nil { |
| 75 | return err |
| 76 | } |
| 77 | defer dst.Close() |
| 78 | |
| 79 | // run compaction. |
| 80 | if err := bolt.Compact(dst, src, o.txMaxSize); err != nil { |
| 81 | return err |
| 82 | } |
| 83 | |
| 84 | // report stats on new size. |
| 85 | fi, err = os.Stat(o.dstPath) |
| 86 | if err != nil { |
| 87 | return err |
| 88 | } else if fi.Size() == 0 { |
| 89 | return fmt.Errorf("zero db size") |
| 90 | } |
| 91 | fmt.Fprintf(cmd.OutOrStdout(), "%d -> %d bytes (gain=%.2fx)\n", initialSize, fi.Size(), float64(initialSize)/float64(fi.Size())) |
| 92 | |
| 93 | return |
| 94 | } |