Correct optimization from 3464f5e77f34; add a test.
If there are two (or more) heads that point to the same .hgtags
node, we can safely skip parsing the file in all but the last head.
(In 3464f5e77f34, we were parsing the file in the first head and
skipping all the others.)
#!/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
#!/bin/sh
echo merging for `basename $1`
EOF
chmod +x merge
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
env HGMERGE=../merge 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/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/data/foo.i
echo "bar: we shouldn't have a merge here"
hg debugindex .hg/data/bar.i
echo "baz: we shouldn't have a merge here"
hg debugindex .hg/data/baz.i
echo "quux: we shouldn't have a merge here"
hg debugindex .hg/data/quux.i
echo "manifest entries should match tips of all files"
hg manifest
echo "everything should be clean now"
hg status
hg verify