[SOLVED] Salvaging chunks from lost+found

[rgj]

Hi,

My filesystem went FUBAR, nuked a couple of directories, and dumped their contents in lost+found, and the files are named after their inode.
How do i generate the SHA-256 digest that the filename is generated from, so I can move them back to the correct directory.

According to the documentation the chunk contains a header and footer, and the sha-256 sum is generated from everything in between.


Happy new year,
René

 

[rgj]

Nobody knows of a way to manually fetch the digest and do a manual check of the chunk?

 

[fabian]

you can use "proxmox-backup-debug inspect chunk":

$ cp /tank/pbs/.chunks/fe90/fe9059f5dbe49c9d502c3aff716cda1ebb9eb829a181d90597d8ba6dc2a8b78a /tmp/chunk

$ proxmox-backup-debug inspect chunk /tmp/chunk --use-filename-as-digest false --decode /tmp/decoded; sha256sum /tmp/decoded
CRC: "1772557324(OK)"
encryption: "none"
fe9059f5dbe49c9d502c3aff716cda1ebb9eb829a181d90597d8ba6dc2a8b78a  /tmp/decoded

replace paths accordingly if your chunks are encrypted, you also need to specify the keyfile for decoding to work (the digest is based on the raw input data, not the encrypted chunk!)

 

[rgj]

Thanks Fabian, that did the trick.