Is there fast & reliable way to check if a directory is a borg repo

[jk-1]

I have a need to search recursively all borg repos for e.g. automated maintenance & pruning.

I could invoke "borg info" in every directory but this is slow.

Is there a faster way to detect that? E.g. there must always be files x, y, z. If yes then I could run the "borg info" to be 100% sure.

[jk-1]

At least "borg config -l" is faster than "borg info"

[ThomasWaldmann]

You could check repo/README.

[PhrozenByte]

You could check repo/README.

In addition: Note that both contents and path of the mentioned README have changed over time, i.e., depending on the Borg version the repo was initially created with.

The following README paths and contents were used in the past:

• Attic: /path/to/repo/README with

  This is an Attic repository
  

• Borg 0.x (since Borg 0.23), and Borg 1.0: /path/to/repo/README with

  This is a Borg repository
  

• Borg 1.1 (since Borg 1.1.0b3) to 1.4: /path/to/repo/README with

  This is a Borg Backup repository.
  See https://borgbackup.readthedocs.io/
  

• Borg 2.0 (since 2.0.0b10): /path/to/repo/config/readme with

  This is a Borg Backup repository.
  See https://borgbackup.readthedocs.io/
  

[PhrozenByte]

For reference:

• Borg 2.0 (since 2.0.0b25): /path/to/repo/config/config with the first two lines (not the full file!)

  # This is a Borg Backup repository.
  # See https://borgbackup.readthedocs.io/
  

[ThomasWaldmann]

Guess checking the first line is best. I might change that URL in the seconds line.