Subject: Re: [PATCH] dir: allow a BOM at the beginning of exclude files

From: Junio C Hamano <[email-masked]>
Date: Thu, 16 Apr 2015 08:39:55 -0700

Carlos Martín Nieto <[email-masked]> writes:

> diff --git a/dir.c b/dir.c
> index 0943a81..6368247 100644
> --- a/dir.c
> +++ b/dir.c
> @@ -581,6 +581,7 @@ int add_excludes_from_file_to_list(const char *fname,
>  	struct stat st;
>  	int fd, i, lineno = 1;
>  	size_t size = 0;
> +	static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
>  	char *buf, *entry;
>  
>  	fd = open(fname, O_RDONLY);
> @@ -617,7 +618,12 @@ int add_excludes_from_file_to_list(const char *fname,
>  	}
>  
>  	el->filebuf = buf;
> -	entry = buf;
> +
> +	if (size >= 3 && !memcmp(buf, utf8_bom, 3))

OK.

> +		entry = buf + 3;
> +	else
> +		entry = buf;
> +
>  	for (i = 0; i < size; i++) {
>  		if (buf[i] == '\n') {
>  			if (entry != buf + i && entry[0] != '#') {
> diff --git a/t/t7061-wtstatus-ignore.sh b/t/t7061-wtstatus-ignore.sh
> index 460789b..0a06fbf 100755
> --- a/t/t7061-wtstatus-ignore.sh
> +++ b/t/t7061-wtstatus-ignore.sh
> @@ -13,6 +13,8 @@ EOF
>  
>  test_expect_success 'status untracked directory with --ignored' '
>  	echo "ignored" >.gitignore &&
> +	sed -e "s/^/\xef\xbb\xbf/" .gitignore >.gitignore.new &&
> +	mv .gitignore.new .gitignore &&

Is this "write literal in \xHEX on the replacement side of sed
substitution" potable?  In any case, replacing the above three with
something like:

	printf "<bom>ignored\n" >.gitignore

may be more sensible, no?

Also do we need a similar change to the attribute side, or are we
already covered and we forgot to do the same for the ignore files?

>  	mkdir untracked &&
>  	: >untracked/ignored &&
>  	: >untracked/uncommitted &&