Subject: Re: [PATCH v2 2/4] use strbuf_getcwd() to get the current working directory without fixed-sized buffers

From: Jeff King <[email-masked]>
Date: Sun, 20 Jul 2014 22:33:12 -0400

On Sun, Jul 20, 2014 at 06:49:54PM +0200, René Scharfe wrote:

> diff --git a/builtin/init-db.c b/builtin/init-db.c
> index 56f85e2..c4958b6 100644
> --- a/builtin/init-db.c
> +++ b/builtin/init-db.c
> @@ -535,10 +535,10 @@ int cmd_init_db(int argc, const char **argv, const char *prefix)
>  		usage(init_db_usage[0]);
>  	}
>  	if (is_bare_repository_cfg == 1) {
> -		static char git_dir[PATH_MAX+1];
> -
> -		setenv(GIT_DIR_ENVIRONMENT,
> -			getcwd(git_dir, sizeof(git_dir)), argc > 0);
> +		struct strbuf cwd = STRBUF_INIT;
> +		strbuf_getcwd(&cwd);
> +		setenv(GIT_DIR_ENVIRONMENT, cwd.buf, argc > 0);
> +		strbuf_release(&cwd);

Hmm. You are not making anything worse here, as we already do not check
the return value of getcwd. But what happens if it fails? Looks like we
currently get a segfault, and the new code will silently set the
variable to the empty string. Neither is particularly helpful.

Should we be using the xgetcwd helper that you add in the next patch?

> -			setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
> +			strbuf_getcwd(&cwd);
> +			setenv(GIT_DIR_ENVIRONMENT, cwd.buf, 0);
> +			strbuf_release(&cwd);

Ditto here.

-Peff