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 Unfortunately, your metadata will be out of date after doing so.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
#
# Generate symlinks.svndump
#

mkdir temp
cd temp

mkdir project-orig
cd project-orig
mkdir trunk
mkdir branches
cd ..

svnadmin create testrepo
svnurl=file://`pwd`/testrepo
svn import project-orig $svnurl -m "init project"

svn co $svnurl project
cd project/trunk
echo a > a
ln -s a linka
ln -s a linka2
mkdir d
ln -s a d/linka
svn add a linka linka2 d
svn ci -m "add symlinks"
# Move symlinks
svn mv linka linkaa
svn mv d d2
svn commit -m "moving symlinks"
# Update symlinks (test "link " prefix vs applydelta)
echo b > b
rm linkaa
ln -s b linkaa
rm d2/linka
ln -s b d2/linka
svn ci -m "update symlinks"
# Replace a symlink with a regular file
rm linkaa
echo data > linkaa
svn propdel svn:special linkaa
# Replace another symlink with a regular file in another way
# It should mark linka2 as R(eplaced)
svn rm linka2
echo data2 > linka2
svn add linka2
svn propdel svn:special linka2
svn rm d2/linka
svn ci -m "undo link"
cd ../..

svnadmin dump testrepo > ../symlinks.svndump