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

From: Junio C Hamano <[email-masked]>
Date: Thu, 09 Jan 2014 14:42:04 -0800

Johannes Sixt <[email-masked]> writes:

> 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.

Could you care to explain "Successful how" a bit here?  Do we see
no-such-dir mkdir'ed and then no-such-dir/file created?  Do we see
file moved to a new file whose name is no-such-dir/?  I am guessing
that it would be the latter, but if that is the case we would need
at least an air-quote around "successful".

> 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 <[email-masked]>
> ---
>  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);