Re: [PATCH] git apply: binary files differ can be applied with -pN (N>1).

[Junio C Hamano <gitster@pobox.com>]

Jiang Xin <worldhello.net@gmail.com> writes:

> When patch file generated against two non-git directories using
> 'git diff --binary --no-index' without '--no-prefix', the patch
> file has patch level greater then 1, and should be applied with
> '-p2' option. But it does not work if there are binary differ
> in the patch file, it is because in one case the patch level is
> not properly handled.
>
> Signed-off-by: Jiang Xin <jiangxin@ossxp.com>

Can you please add a testcase to protect your fix from getting broken by
later changes by other people, perhaps to t/t4120?

By the way, this codepath is shared by all forms of patches "diff --git"
header, not just binary.  Do you see a similar breakage with --no-prefix
patches that are not binary, and if not why?

> ---
>  builtin/apply.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/builtin/apply.c b/builtin/apply.c
> index 23c18c5..d603e37 100644
> --- a/builtin/apply.c
> +++ b/builtin/apply.c
> @@ -1126,6 +1126,7 @@ static char *git_header_name(char *line, int llen)
>  	 * form.
>  	 */
>  	for (len = 0 ; ; len++) {
> +		int nslash = p_value;
>  		switch (name[len]) {
>  		default:
>  			continue;
> @@ -1137,7 +1138,7 @@ static char *git_header_name(char *line, int llen)
>  				char c = *second++;
>  				if (c == '\n')
>  					return NULL;
> -				if (c == '/')
> +				if (c == '/' && --nslash <= 0)
>  					break;
>  			}
>  			if (second[len] == '\n' && !memcmp(name, second, len)) {
> -- 
> 1.7.3.2.245.g03276.dirty