Function repo_index_has_changes

read-cache.c:2504–2541

}

int repo_index_has_changes(struct repository *repo,
			   struct tree *tree,
			   struct strbuf *sb)
{
	struct index_state *istate = repo->index;
	struct object_id cmp;
	int i;

	if (tree)
		cmp = tree->object.oid;
	if (tree || !repo_get_oid_tree(repo, "HEAD", &cmp)) {
		struct diff_options opt;

		repo_diff_setup(repo, &opt);
		opt.flags.exit_with_status = 1;
		if (!sb)
			opt.flags.quick = 1;
		diff_setup_done(&opt);
		do_diff_cache(&cmp, &opt);
		diffcore_std(&opt);
		for (i = 0; sb && i < diff_queued_diff.nr; i++) {
			if (i)
				strbuf_addch(sb, ' ');
			strbuf_addstr(sb, diff_queued_diff.queue[i]->two->path);
		}
		diff_flush(&opt);
		return opt.flags.has_changes != 0;
	} else {
		/* TODO: audit for interaction with sparse-index. */
		ensure_full_index(istate);
		for (i = 0; sb && i < istate->cache_nr; i++) {
			if (i)
				strbuf_addch(sb, ' ');
			strbuf_addstr(sb, istate->cache[i]->name);
		}
		return !!istate->cache_nr;
	}
}

static int write_index_ext_header(struct hashfile *f,
				  struct git_hash_ctx *eoie_f,