bbolt CLI surgery commands

[ptabor]

After #361 is submitted it would be good to expose additional bbolt file 'surgery' commands:

1. bbolt surgery revert-meta-page. db.inputFile db.outputFile

   • should execute

     bbolt/internal/surgeon/surgeon.go

     Line 41 in d13096e

     func RevertMetaPage(path string) error {

2. bbolt surgery copy-page db.inputFile db.outputFile 17 14

• should execute

  bbolt/internal/surgeon/surgeon.go

  Line 10 in d13096e

  func CopyPage(path string, srcPage guts_cli.Pgid, target guts_cli.Pgid) error {

3 bbolt surgery write-empty-branch-page db.inputFile db.outputFile 17

• should execute a new command that overwites given page with an empty node.

Follow up to: #335

[ahrtr]

bbolt surgery write-empty-branch-page db.inputFile db.outputFile 17

* should execute a new command that overwites given page with an empty node.

Why don't we support write-empty-page so that we can overwrite whatever page (branch or leaf)?

[ahrtr]

Instead of write-empty-page to get rid of the whole page and all its children, it would make more sense to add the command something like clear-page-elements to get rid of some elements in the given page and all the children the removed elements link to.

It's exactly how previously I fixed a corrupted db file. FYI issues/13406/main.go

[ahrtr]

Note, the following commands will be included in v1.3.7,

• bbolt surgery revert-meta-page
• bbolt surgery copy-page
• bbolt surgery clear-page

All other changes will be included in next release, hopefully 1.4.0.