Re: [PATCH] mv: let 'git mv file no-such-dir/' error out

> Git used to trim the trailing slash, and make the command equivalent to
> 'git mv file no-such-dir', which created the file no-such-dir (while the
> trailing slash explicitly stated that it could only be a directory).
>
> This patch skips the trailing slash removal for the destination path. The
> path with its trailing slash is passed to rename(2), which errors out
> with the appropriate message:
>
>   $ git mv file no-such-dir/
>   fatal: renaming 'file' failed: Not a directory

> Original-patch-by: Duy Nguyen <pclouds@gmail.com>
> Tests, tweaks and commit message by: Matthieu Moy <Matthieu.Moy@imag.fr>
>
> Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
> ---
>  builtin/mv.c  | 23 ++++++++++++++++-------
>  t/t7001-mv.sh | 10 ++++++++++
>  2 files changed, 26 insertions(+), 7 deletions(-)
>
> diff --git a/builtin/mv.c b/builtin/mv.c
> index 2e0e61b..08fbc03 100644
> --- a/builtin/mv.c
> +++ b/builtin/mv.c
> @@ -16,9 +16,12 @@ static const char * const builtin_mv_usage[] = {
>         NULL
>  };
>
> +#define DUP_BASENAME 1
> +#define KEEP_TRAILING_SLASH 2
> +
>  static const char **internal_copy_pathspec(const char *prefix,
>                                            const char **pathspec,
> -                                          int count, int base_name)
> +                                          int count, unsigned flags)
>  {
>         int i;
>         const char **result = xmalloc((count + 1) * sizeof(const char *));
> @@ -27,11 +30,12 @@ static const char **internal_copy_pathspec(const char *prefix,
>         for (i = 0; i < count; i++) {
>                 int length = strlen(result[i]);
>                 int to_copy = length;
> -               while (to_copy > 0 && is_dir_sep(result[i][to_copy - 1]))
> +               while (!(flags & KEEP_TRAILING_SLASH) &&
> +                      to_copy > 0 && is_dir_sep(result[i][to_copy - 1]))
>                         to_copy--;
> -               if (to_copy != length || base_name) {
> +               if (to_copy != length || flags & DUP_BASENAME) {
>                         char *it = xmemdupz(result[i], to_copy);
> -                       if (base_name) {
> +                       if (flags & DUP_BASENAME) {
>                                 result[i] = xstrdup(basename(it));
>                                 free(it);
>                         } else
> @@ -87,16 +91,21 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
>
>         source = internal_copy_pathspec(prefix, argv, argc, 0);
>         modes = xcalloc(argc, sizeof(enum update_mode));
> -       dest_path = internal_copy_pathspec(prefix, argv + argc, 1, 0);
> +       /*
> +        * Keep trailing slash, needed to let
> +        * "git mv file no-such-dir/" error out.
> +        */
> +       dest_path = internal_copy_pathspec(prefix, argv + argc, 1,
> +                                          KEEP_TRAILING_SLASH);
>         submodule_gitfile = xcalloc(argc, sizeof(char *));
>
>         if (dest_path[0][0] == '\0')
>                 /* special case: "." was normalized to "" */
> -               destination = internal_copy_pathspec(dest_path[0], argv, argc, 1);
> +               destination = internal_copy_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
>         else if (!lstat(dest_path[0], &st) &&
>                         S_ISDIR(st.st_mode)) {
>                 dest_path[0] = add_slash(dest_path[0]);
> -               destination = internal_copy_pathspec(dest_path[0], argv, argc, 1);
> +               destination = internal_copy_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
>         } else {
>                 if (argc != 1)
>                         die("destination '%s' is not a directory", dest_path[0]);
> diff --git a/t/t7001-mv.sh b/t/t7001-mv.sh
> index b90e985..e5c8084 100755
> --- a/t/t7001-mv.sh
> +++ b/t/t7001-mv.sh
> @@ -72,6 +72,16 @@ rm -f idontexist untracked1 untracked2 \
>       .git/index.lock
>
>  test_expect_success \
> +    'moving to target with trailing slash' \
> +    'test_must_fail git mv path0/COPYING no-such-dir/ &&
> +     test_must_fail git mv path0/COPYING no-such-dir// &&
> +     git mv path0/ no-such-dir/'
> +
> +test_expect_success \
> +    'clean up' \
> +    'git reset --hard'
> +
> +test_expect_success \
>      'adding another file' \
>      'cp "$TEST_DIRECTORY"/../README path0/README &&
>       git add path0/README &&
> --
> 1.8.5.rc3.4.g8bd3721
>