Re: [PATCH v2] convert log_ref_write_fd() to use strbuf

> diff --git a/refs/files-backend.c b/refs/files-backend.c
> index a9a066dcfb..054306d779 100644
> --- a/refs/files-backend.c
> +++ b/refs/files-backend.c
> @@ -1582,26 +1582,17 @@ static int log_ref_write_fd(int fd, const struct object_id *old_oid,
>  			    const struct object_id *new_oid,
>  			    const char *committer, const char *msg)
>  {
> -	int msglen, written;
> -	unsigned maxlen, len;
> -	char *logrec;
> -
> -	msglen = msg ? strlen(msg) : 0;
> -	maxlen = strlen(committer) + msglen + 100;
> -	logrec = xmalloc(maxlen);
> -	len = xsnprintf(logrec, maxlen, "%s %s %s\n",
> -			oid_to_hex(old_oid),
> -			oid_to_hex(new_oid),
> -			committer);
> -	if (msglen)
> -		len += copy_reflog_msg(logrec + len - 1, msg) - 1;
> -
> -	written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
> -	free(logrec);
> -	if (written < 0)
> -		return -1;
> +	struct strbuf sb = STRBUF_INIT;
> +	int ret = 0;
>  
> -	return 0;
> +	strbuf_addf(&sb, "%s %s %s", oid_to_hex(old_oid), oid_to_hex(new_oid), committer);
> +	if (msg && *msg)
> +		copy_reflog_msg(&sb, msg);
> +	strbuf_addch(&sb, '\n');
> +	if (write_in_full(fd, sb.buf, sb.len) < 0)
> +		ret = -1;
> +	strbuf_release(&sb);
> +	return ret;