git-mv: special case destination "."

Since the normalized basename of "." is "", the check for directory
failed erroneously.

Noticed by Fredrik Kuivinen.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-mv.c

@@ -114,7 +114,10 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 	modes = xcalloc(count, sizeof(enum update_mode));
 	dest_path = copy_pathspec(prefix, argv + argc - 1, 1, 0);
 
-	if (!lstat(dest_path[0], &st) &&
+	if (dest_path[0][0] == '\0')
+		/* special case: "." was normalized to "" */
+		destination = copy_pathspec(dest_path[0], argv + i, count, 1);
+	else if (!lstat(dest_path[0], &st) &&
 			S_ISDIR(st.st_mode)) {
 		dest_path[0] = add_slash(dest_path[0]);
 		destination = copy_pathspec(dest_path[0], argv + i, count, 1);

t/t7001-mv.sh

@@ -82,4 +82,8 @@ test_expect_failure \
     'do not move directory over existing directory' \
     'mkdir path0 && mkdir path0/path2 && git-mv path2 path0'
 
+test_expect_success \
+    'move into "."' \
+    'git-mv path1/path2/ .'
+
 test_done