[PATCH mm/mv-file-to-no-such-dir-with-slash] mv: let 'git mv file no-such-dir/' error out on Windows, too

[Johannes Sixt <j6t@kdbg.org>]

The previous commit c57f628 (mv: let 'git mv file no-such-dir/' error out)
relies on that rename("src", "dst/") fails if directory dst does not
exist (note the trailing slash). This does not work as expected on Windows:
This rename() call is successful. Insert an explicit check for this case.

This changes the error message from

   $ git mv file no-such-dir/
   fatal: renaming 'file' failed: Not a directory

to

   $ git mv file no-such-dir/
   fatal: destination directory does not exist, source=file, destination=no-such-dir/

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
---
 builtin/mv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/builtin/mv.c b/builtin/mv.c
index 08fbc03..21c46d1 100644
--- a/builtin/mv.c
+++ b/builtin/mv.c
@@ -214,6 +214,8 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 			}
 		} else if (string_list_has_string(&src_for_dst, dst))
 			bad = _("multiple sources for the same target");
+		else if (is_dir_sep(dst[strlen(dst) - 1]))
+			bad = _("destination directory does not exist");
 		else
 			string_list_insert(&src_for_dst, dst);
 
-- 
1.8.5.2.1473.g6546919