Diagnostic command to display what snapshots a blob/tree belongs to

[McKael]

This is not a bug report but a feature proposal.

A few times, I've been missing a command to list the snapshots that contain a specific tree or blob, or the snapshots affected by a corrupted pack.

I'd like to be able to use a restic command for this case (AFAIK it does not exist yet) and I've written some POC code.
I can do a PR to discuss this further if this suggestion sounds reasonable to you.

Here's a practical example.

% restic check
repository a04959d0 opened successfully, password is correct
create exclusive lock for repository
load indexes
check all packs
check snapshots, trees and blobs
(...)
error for tree e437ff75:
  tree e437ff75: file "checks.db": metadata size (122171392) and sum of blob sizes (122175488) do not match
Fatal: repository contains errors

Let's check what this tree actually is and which snapshot is affected.

% restic what-contains tree e437ff75
repository a04959d0 opened successfully, password is correct
Found tree e437ff75
 ... path /mikael/check-data
 ... in snapshot f120bfbf

Here's another example with a random blob in one of my repositories:

% restic what-contains blob 9dcf5f6a254fb58c8b2a7e604dc76b71fbad847f6ade751513968cf2f1f161fc
repository a04959d0 opened successfully, password is correct
Blob found in pack cf8a3fa3b2c9c7a08b6b6fc6cce9fdc2eeb4dd26ebd2d67b081d63f24dd408d8
 ... Pack cf8a3fa3: <Blob (data) 9dcf5f6a, offset 2486760, length 12214>
Found blob 9dcf5f6a254fb58c8b2a7e604dc76b71fbad847f6ade751513968cf2f1f161fc
 ... in file 1398431273.H215567P22415.mail.example.com:2,
 ... in snapshot 067f149f
Found blob 9dcf5f6a254fb58c8b2a7e604dc76b71fbad847f6ade751513968cf2f1f161fc
 ... in file 1398431273.H215567P22415.mail.example.com:2,
 ... in snapshot 0a781e61
Found blob 9dcf5f6a254fb58c8b2a7e604dc76b71fbad847f6ade751513968cf2f1f161fc
 ... in file 1398431273.H215567P22415.mail.example.com:2,
 ... in snapshot 15ab2468
(...)

I'd also like to be able to do

% restic what-contains pack cf8a3fa3

but I haven't had a look at it yet.

Please let me know if it would be useful to other people than me.

[McKael]

I have added support for packs (see the PR):

% restic what-contains pack 0014cae1664cda85b69d22c3e0d86fe56085aebc3333613b7a956ea854dab118
repository a04959d0 opened successfully, password is correct
Looking for packs...
Found pack 0014cae1664cda85b69d22c3e0d86fe56085aebc3333613b7a956ea854dab118
33 blobs found
Found blob 1c4925a45401e8ecf71c2dc1a0294a823419839b122c80c973c7fc95d0a8a87b
 ... in file ____init____.py.i
 ... in snapshot 00ccb2af
Found blob 909975ec21ccf6b28c05a88a7281a0b3fd7ee235d31eec73eced46ef2efd9835
 ... in file posix.py.i
 ... in snapshot 00ccb2af
Found blob 46dbe70ab31e84c542bb0b226cd3bce0d33bc0807b56ab37f434eae32cc07692
 ... in file ch02_19.htm
 ... in snapshot 5b7eca88
(...)

[fd0]

This looks great, thank you so much for spending time on it! I'm currently swamped with other real-life issues, and I've got a huge backlog of things to review. Sorry for that!

[McKael]

Closing this issue as the Merge Request #1780 has been accepted.