Am 20.10.2014 um 12:31 schrieb Gerd Hoffmann:
On Fr, 2014-10-17 at 11:49 +0000, Andre Robatino wrote:Roberto Ragusa <mail <at> robertoragusa.it> writes:Are compressed rpms completely impossible to diff efficiently by rsync?In a word, yes. They're already compressed, so it's unlikely there would be any matching blocks between old and new rpms for rsync to take advantage of.Years ago I saw rsync being patched for this (done by suse IIRC). Basic trick is to teach rsync to unpack/repack rpms, thereby effectively rsyning the files within the rpm, which works *alot* better than using the compressed rpm payload
and has exactly the same result as deltarpm now where the most performance drop is repack the RPM based on the delta - you you are doing exactly the same more complex and introduce additional software in the mix
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