read-tree -u one-way merge fix to check out locally modified paths.

The "-u" flag means "update the working tree files", but to
other types of merges, it also implies "I want to keep my local
changes" -- because they prevent local changes from getting lost
by using verify_uptodate.  The one-way merge is different from
other merges in that its purpose is opposite of doing something
else while keeping unrelated local changes.  The point of
one-way merge is to nuke local changes.  So while it feels
somewhat wrong that this actively loses local changes, it is the
right thing to do.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/read-tree.c b/read-tree.c
index 11157f4..59b6a6b 100644 (file)
--- a/read-tree.c
+++ b/read-tree.c
@@ -686,6 +686,9 @@ static int oneway_merge(struct cache_entry **src)
        if (!a)
                return deleted_entry(old, NULL);
        if (old && same(old, a)) {
+               struct stat st;
+               if (lstat(old->name, &st) || ce_match_stat(old, &st, 1))
+                       old->ce_flags |= htons(CE_UPDATE);
                return keep_entry(old);
        }
        return merged_entry(a, NULL);