[Box Backup] rsync:ing the backup storage?

[Chris Wilson]

Hi Magnus,

On Mon, 3 Dec 2007, Magnus Homann wrote:

> >Next best is to create and lock the write.lock file in each
> > account as you copy that account.
> 
> Is it possible to do that from a shell script in an easy way? How mych 
> locking is enough?

Box itself does flock() or fcntl(F_SETLK), neither of which is possible 
directly from a shell script , as far as I know. However you could write a 
small C program that locks the file and goes into the background (it has 
to stay running) and call that from your shell script.

> > If you do get an inconsistent copy, then it will be repaired 
> > automatically on the next backup run.
> 
> Unless my computer went into flames in the mean time. :-)

Indeed :-)

Perhaps Ben can tell us whether this is really safe, i.e. whether the 
atomic behaviour works the way I think it does?

Cheers, Chris.
-- 
_____ __     _
\  __/ / ,__(_)_  | Chris Wilson <0000 at qwirx.com> - Cambs UK |
/ (_/ ,\/ _/ /_ \ | Security/C/C++/Java/Perl/SQL/HTML Developer |
\ _/_/_/_//_/___/ | We are GNU-free your mind-and your software |