rsync feature suggestion
hadmut at danisch.de
Fri Jan 3 17:54:00 EST 2003
On Fri, Jan 03, 2003 at 11:28:37AM -0600, Edward King wrote:
> Might it be possible to take the file list that you want to feed to
> rsync and turn it into an rsync.conf file?
It might be possible, but maybe it is ambiguous and definitely not
efficient, since --include defines a Pattern, not a file name/path.
As far as I know, rsync has to check every single file against all
include/exclude patterns. That's a complexity of O(n^2). I'm talking
about directories with 30,000 .. 1,000,000 files. This could
end up in 10^12 file name/comparison patterns, and that's certainly
not what you want to have.
If you read a list of plain filenames, you do not need to perfom
pattern matching, but can use a simple associative/hash array and
check extremely fast, whether a given filename is to be copied or
not. That's a very important difference to a list of patterns.
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