Re: [PATCH v17 12/17] Reftable support for git-core

> +static int reftable_init_db(struct ref_store *ref_store, struct strbuf *err)
> +{
> +	struct git_reftable_ref_store *refs =
> +		(struct git_reftable_ref_store *)ref_store;
> +	struct strbuf sb = STRBUF_INIT;
> +
> +	safe_create_dir(refs->reftable_dir, 1);
> +
> +	strbuf_addf(&sb, "%s/HEAD", refs->repo_dir);
> +	write_file(sb.buf, "ref: refs/.invalid");

> +	strbuf_reset(&sb);
> +
> +	strbuf_addf(&sb, "%s/refs", refs->repo_dir);
> +	safe_create_dir(sb.buf, 1);
> +	strbuf_reset(&sb);
> +
> +	strbuf_addf(&sb, "%s/refs/heads", refs->repo_dir);
> +	write_file(sb.buf, "this repository uses the reftable format");
> +
> +	return 0;
> +}