confusing snapshot error

[Russell Coker <russell@coker.com.au>]

ERROR: cannot snapshot '/home' - Read-only file system

The above error occurs when a read-only snapshot already exists.

I think it would be better if the target name had to be fully qualified and 
gave an error "path already 
exists" or something similar.  While the current behavior mimics the operation 
of mv and is surely 
considered a feature by some people, I don't think that mimicing mv is that 
great a feature and the 
current operation gives misleading errors when a snapshot exists.  I just had 
errors from a bunch of 
systems when daylight savings ended and it would have saved me some time if 
the error was clearer.

If we are going to mimic traditional Unix commands then I think it would be 
good to have functionality 
analogous to "mkdir -p" so that next year my cron jobs just quietly don't try 
to make snapshots twice.


Thanks

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