Greetings,
I've been looking through archives, googling, and reading through man pages to
no avail for some time now. I believe I need some combination of rsync -u
(update) and rsync --del, and I'm not quite sure how to get it.
I'm looking to build a rough implementation of a multi-client rdiff-backup
system; in order to do this I'm using rsync before rdiff-backup.
(We'll say there's a server, Client A, and Client B. Files should be synced
between A and B but the server should keep a master list of all differences and
changes made in any file, by any client in the directory I'm syncing).
Essentially, I envision that syncing client A would go something like this:
1. Rsync down from the server to Client A in order to ensure that any
newly-created files added recently by Client B (which would have already been
uploaded - via rdiff-backup - to the server) is added to the local directory on
Client A.
2. Rdiff-backup from Client A to the server. This will not increment the
freshly downloaded files created by client B, as the modified times are equal.
However, it would update those newly-created/edit files on Client A since the
last sync.
However, I will run into problems when I delete a file.
If I delete a file off of either client, the file will be un-deleted when I
rsync down in step one, as the file would still exist on the server. But if I
use rsync --del, it would just delete any and all new files created on a client
since the last sync.
The best solution I can envision is to write a shell script (or modify the
rsync source) which would alter step 1 above to the following:
global variable lastSync; //last synchronization for this client
function syncFile(file, modifiedDate){
if (modifiedDate > lastSync){
//this must be a new file created from another client.
download the file from the server
}
else{
//the file has been deleted on the client since the last sync, delete it.
delete the file.
}
}
I suppose I would first be interested to hear if anyone see any
pitfalls/logical errors in the above implementation?
More pertinently to this list, what approach should I take with this? Would it
be possible to implement something of this nature with shell scripts or would I
really need to modify the source? Has anyone tried anything comperable?
Thank you for your help and time
Jeff
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