Re: [PATCH 2/2] mingw: allow absolute paths without drive prefix

[Johannes Sixt <j6t@kdbg.org>]

Am 10.12.18 um 19:47 schrieb Johannes Schindelin via GitGitGadget:
> From: Johannes Schindelin <johannes.schindelin@gmx.de>
> 
> When specifying an absolute path without a drive prefix, we convert that
> path internally. Let's make sure that we handle that case properly, too
> ;-)
> 
> This fixes the command
> 
> 	git clone https://github.com/git-for-windows/git \G4W
> 
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
>   compat/mingw.c            | 10 +++++++++-
>   t/t5580-clone-push-unc.sh |  2 +-
>   2 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/compat/mingw.c b/compat/mingw.c
> index 34b3880b29..4d009901d8 100644
> --- a/compat/mingw.c
> +++ b/compat/mingw.c
> @@ -928,11 +928,19 @@ unsigned int sleep (unsigned int seconds)
>   char *mingw_mktemp(char *template)
>   {
>   	wchar_t wtemplate[MAX_PATH];
> +	int offset = 0;
> +
>   	if (xutftowcs_path(wtemplate, template) < 0)
>   		return NULL;
> +
> +	if (is_dir_sep(template[0]) && !is_dir_sep(template[1]) &&
> +	    iswalpha(wtemplate[0]) && wtemplate[1] == L':') {
> +		/* We have an absolute path missing the drive prefix */

This comment is true for the source part, template, but I can't find 
where the destination, wtemplate, suddenly gets the drive prefix. As far 
as I can see, xutftowcs_path() just does a plain textual conversion 
without any interpretation of the text as path. Can you explain it?

BTW, iswalpha() is not restricted to ASCII letters, I would rewrite it 
as (wtemplate[0] <= 127 && isalpha(wtemplate[0]).

> +		offset = 2;
> +	}
>   	if (!_wmktemp(wtemplate))
>   		return NULL;
> -	if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
> +	if (xwcstoutf(template, wtemplate + offset, strlen(template) + 1) < 0)
>   		return NULL;
>   	return template;
>   }
> diff --git a/t/t5580-clone-push-unc.sh b/t/t5580-clone-push-unc.sh
> index c2b0082296..17c38c33a5 100755
> --- a/t/t5580-clone-push-unc.sh
> +++ b/t/t5580-clone-push-unc.sh
> @@ -29,7 +29,7 @@ case "$UNCPATH" in
>   	;;
>   esac
>   
> -test_expect_failure 'clone into absolute path lacking a drive prefix' '
> +test_expect_success 'clone into absolute path lacking a drive prefix' '
>   	USINGBACKSLASHES="$(echo "$WITHOUTDRIVE"/without-drive-prefix |
>   		tr / \\\\)" &&
>   	git clone . "$USINGBACKSLASHES" &&
> 

-- Hannes