merge: do early copy to deal with issue636 Without copies/renames, merges source names are 1:1 with their targets. Copies and renames introduce the possibility that there will be two merges with the same input but different output. By doing the copy to the destination name before the merge, the actual merge becomes 1:1 again, and no source is the input to two different merges. - add a preliminary scan to applyupdates to do copies - for the merge action, pass the old name (for finding ancestors) and the new name (for input to the merge) to filemerge - eliminate the old post-merge copy - lookup file contents from new name in filemerge - pass new name to external merge helper - report merge failure at new name - add a test

#!/bin/sh

origdir=`pwd`

cat >> readlink.py <<EOF
import os
import sys

for f in sys.argv[1:]:
    print f, '->', os.readlink(f)
EOF

hg init repo
cd repo
ln -s nothing dangling
hg ci -qAm 'add symlink'

hg archive -t files ../archive
hg archive -t tar -p tar ../archive.tar
hg archive -t zip -p zip ../archive.zip

echo '% files'
cd "$origdir"
cd archive
python ../readlink.py dangling

echo '% tar'
cd "$origdir"
tar xf archive.tar
cd tar
python ../readlink.py dangling

echo '% zip'
cd "$origdir"
unzip archive.zip > /dev/null
cd zip
python ../readlink.py dangling