Feature Request: Propagate File Locks to the Backing Files

[guedressel]

Does gocryptfs do file locking through the fuse layer?

So if a mounted & decrypted file gets a lock by a process using it, will the underlying encrypted source file also have a lock?

[rfjakob]

No, unfortunately file locking requests are currently thrown away by the go-fuse library. This is mentioned in the go-fuse README as a TODO, so there are good chances of getting it merged.

[rfjakob]

Ok to close I guess?

[guedressel]

Well - actually it's postponed, not closed.
To keep record on the go-fuse progress I created an issue there: hanwen/go-fuse#134

[guedressel]

hanwen/go-fuse#134 got closed!

[rfjakob]

Nice!

[rfjakob]

Unfortunately, the Flock implementation in go-fuse does not seem to be working yet: hanwen/go-fuse#153 (comment)

[rfjakob]

Just curious: What is your use case for this? I'm afraid this is going to take a while to land in go-fuse.

[charles-dyfis-net]

This isn't my ticket originally, but my own use case is locking files on a NFS store multiple systems are accessing via gocryptfs.

[guedressel]

My use case is to have the underlying encrypted backing files being synced across multiple computers with sync tools (syncany, dropbox, ...).
If an unencrypted file is in use / has a lock it's underlying encrypted file might still be overwritten by such a tool if it can't see the lock.

[invis-z]

hanwen/go-fuse#220 seems fixed flock, could you have a look at it? Thanks!

[rfjakob]

Indeed, I'll take a look in september!

[kototama]

Any news on these? If I understand correctly it prevents gocryptfs to be used with cloud sync tools.

[rfjakob]

No news here, but this is not related to cloud sync tools.

Dropbox, nextcloud etc work fine

[rfjakob]

(tbh, i doubt that dropbox etc even look at file locks)

[kototama]

Oh ok, I misunderstood the issue in that case. Thanks for the quick answer.

[kototama]

Out of topic but I don't know where to ask: so will gocryptfs avoid corruption when two cloud sync clients modify the same file on two computers at the same time?

[rfjakob]

What usually happens is that the cloud sync client creates a file like

my file (copy 1).txt