It seems that the change to support this would be minimal, see below.
All file writing during restore seems to be done by
util.py/copyfileobj()
Unless I'm very much mistaken, the following change would do sparse
files, _if_ (and only if) the target object is empty to begin with. If
it isn't, this will keep blocks with old content when it shouldn't(big
caveat).
if all([ b == 0 for b in buf ]):
outfp.seek(len(buf), 1) # Move forward len(buf) bytes
else:
bytes_written += len(buf)
outfp.write(buf)
as the replacement for what previously were the last two lines of the above.
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https://bugs.launchpad.net/bugs/1576051
Title:
Duplicity cannot handle sparse files efficiently
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