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
# This test makes sure that we don't mark a file as merged with its ancestor
# when we do a merge.
cat <<EOF > merge
import sys, os
print "merging for", os.path.basename(sys.argv[1])
EOF
HGMERGE="python ../merge"; export HGMERGE
echo creating base
hg init a
cd a
echo 1 > foo
echo 1 > bar
echo 1 > baz
echo 1 > quux
hg add foo bar baz quux
hg commit -m "base" -d "1000000 0"
cd ..
hg clone a b
echo creating branch a
cd a
echo 2a > foo
echo 2a > bar
hg commit -m "branch a" -d "1000000 0"
echo creating branch b
cd ..
cd b
echo 2b > foo
echo 2b > baz
hg commit -m "branch b" -d "1000000 0"
echo "we shouldn't have anything but n state here"
hg debugstate | cut -b 1-16,35-
echo merging
hg pull ../a
hg merge -v
echo 2m > foo
echo 2b > baz
echo new > quux
echo "we shouldn't have anything but foo in merge state here"
hg debugstate | cut -b 1-16,35- | grep "^m"
hg ci -m "merge" -d "1000000 0"
echo "main: we should have a merge here"
hg debugindex .hg/store/00changelog.i
echo "log should show foo and quux changed"
hg log -v -r tip
echo "foo: we should have a merge here"
hg debugindex .hg/store/data/foo.i
echo "bar: we shouldn't have a merge here"
hg debugindex .hg/store/data/bar.i
echo "baz: we shouldn't have a merge here"
hg debugindex .hg/store/data/baz.i
echo "quux: we shouldn't have a merge here"
hg debugindex .hg/store/data/quux.i
echo "manifest entries should match tips of all files"
hg manifest --debug
echo "everything should be clean now"
hg status
hg verify