Partial metadata rebuilding For highly active subversion repositories, it can be excruciatingly slow to pull updates one at a time from subversion. One way around this is to setup another mercurial repo that pulls new commits from svn periodicly (say every 5 minutes). When you want to update your repository, you can pull commits from this mercurial repository via native mercurial protocols, which will be much faster than pulling directly from svn. Unfortunately, your metadata will be out of date after doing so. Highly active repositories also tend to be very large, which means that it takes a long time to rebuild your metadata from scratch. To address this, this adds support to do a partial rebuild on the metadata by processing only revisions that have been added to the repository after the last revision we processed. With the rev map 1k revisions (~2 days) behind tip updatemeta is dramatically faster than rebuild meta: $ hg --time svn updatemeta Time: real 0.570 secs (user 0.480+0.000 sys 0.060+0.000) $ hg --time svn rebuildmeta Time: real 129.160 secs (user 128.570+0.000 sys 0.320+0.000)

#!/bin/sh

mkdir temp
cd temp
svnadmin create repo
svn co file://`pwd`/repo wc
export REPO=file://`pwd`/repo
cd wc
mkdir branches trunk tags
svn add *
svn ci -m 'Empty dirs.'

echo 'file: alpha' > trunk/alpha
svn add trunk/alpha
svn ci -m 'Add alpha'
svn up

echo 'Data of beta' > trunk/beta
svn add trunk/beta
svn ci -m 'Add beta'
svn up
cd ..

svn cp -m 'tagging r3' $REPO/trunk@3 $REPO/tags/tag_r3
svn cp -m 'tag from a tag' $REPO/tags/tag_r3 $REPO/tags/copied_tag
svn mv -m 'rename a tag' $REPO/tags/copied_tag $REPO/tags/other_tag_r3
cd ..
svnadmin dump temp/repo > rename_tag_test.svndump
echo
echo 'Complete.'
echo 'You probably want to clean up temp now.'
echo 'Dump in renametagdir.svndump'
exit 0