Colin Percival 210b8123c3 When storing old versions of files for use in generating new files via
patching and for rolling back updates, don't copy a file if it has already
been stored.  This provides a significant speedup to the "Preparing to
download files" stage of "freebsd-update fetch" if many updates have already
been applied or if a file being updated is linked many times (such as
/rescue/*).

Reported by:	Paul Dekkers
MFC after:	1 week
Approved by:	re (bmah)
2007-08-07 19:33:46 +00:00
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