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/freebsd-10.2-release/usr.sbin/freebsd-update/
H A Dfreebsd-update.shdiff 171784 Tue Aug 07 19:33:46 MDT 2007 cperciva 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)

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