From: Eric Wong <normalperson@yhbt.net>
Date: Sun, 9 Dec 2007 07:27:42 +0000 (-0800)
Subject: git-svn: reinstate old rev_db optimization in new rev_map
X-Git-Tag: v1.5.4-rc0~3^2
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/66ab84b99cdff3d650c9458aa737916735aebfcc?hp=66ab84b99cdff3d650c9458aa737916735aebfcc

git-svn: reinstate old rev_db optimization in new rev_map

This reinstates an old optimization in .rev_db which
stored the highest revision number we scanned, allowing
us to avoid scanning the SVN log for those revisions
again in a subsequent invocation.

This means the last 24-byte record in a .rev_map file
can be a 4-byte SVN revision number with 20-bytes of
zeroes representing a non-existent commit.  This record
can and will be overwritten when a new commit iff
the commit is all zeroes.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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