Mercurial > hg
view tests/svn/svndump-replace.sh @ 28000:d4247c306d82
copies: optimize forward copy detection logic for rebases
Forward copy detection (i.e. detecting what files have been moved/copied in
commit X since ancestor Y) previously required diff'ing the manifests of both X
and Y. This was expensive since it required reading both entire manifests and
doing a set difference (they weren't already in a set because of the
lazymanifest work). This cost almost 1 second on very large repositories, and
happens N times for a rebase of N commits.
This patch optimizes it for the case of rebase. In a rebase, we are comparing a
commit against it's immediate parent, and therefore we can know what files
changed by looking at ctx.files(). This lets us drastically decrease the size
of the set comparison, and makes it O(# of changes) instead of O(size of
manifest). This makes it take 1ms instead of 1000ms.
author | Durham Goode <durham@fb.com> |
---|---|
date | Fri, 05 Feb 2016 13:23:24 -0800 |
parents | 5fb924ee44d5 |
children |
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#!/bin/sh RSVN="`pwd`/rsvn.py" export PATH=/bin:/usr/bin mkdir temp cd temp svnadmin create repo svn co file://`pwd`/repo wc cd wc mkdir trunk branches cd trunk echo a > a mkdir d echo b > d/b ln -s d dlink ln -s d dlink2 ln -s d dlink3 mkdir d2 echo a > d2/a cd .. svn add * svn ci -m 'initial' # Clobber symlink with file with similar content cd trunk ls -Alh readlink dlink3 > dlink3tmp rm dlink3 mv dlink3tmp dlink3 svn propdel svn:special dlink3 svn ci -m 'clobber symlink' cd .. svn up # Clobber files and symlink with directories cd .. cat > clobber.rsvn <<EOF rdelete trunk/a rdelete trunk/dlink rcopy trunk/d trunk/a rcopy trunk/d trunk/dlink EOF python $RSVN --message=clobber1 --username=evil `pwd`/repo < clobber.rsvn # Clobber non-symlink with symlink with same content (kudos openwrt) cat > clobber.rsvn <<EOF rdelete trunk/dlink3 rcopy trunk/dlink2 trunk/dlink3 EOF python $RSVN --message=clobber2 --username=evil `pwd`/repo < clobber.rsvn # Create d2 in branch so d2 has 'a' is in branch/d2 and trunk/d2, # 'b' is in trunk/d2 and 'c' is in branch/d2 cd wc/trunk echo b > d2/b svn add d2/b svn ci -m adddb cd .. svn up svn cp trunk branches/branch cd branches/branch svn rm d2/b echo c > d2/c svn add d2/c cd ../.. svn ci -m branch svn up cd .. cat > clobber.rsvn <<EOF rdelete trunk/d2 rcopy branches/branch/d2 trunk/d2 EOF python $RSVN --message=clobberdir --username=evil `pwd`/repo < clobber.rsvn svn log -v file://`pwd`/repo svnadmin dump repo > ../replace.svndump