Function update_some

builtin/checkout.c:193–234

}

static int update_some(const struct object_id *oid, struct strbuf *base,
		       const char *pathname, unsigned mode, void *context)
{
	int len;
	struct cache_entry *ce;
	int pos;
	int overlay_mode = context ? *((int *)context) : 1;

	if (S_ISDIR(mode))
		return try_update_sparse_directory(oid, base, pathname,
						   overlay_mode);

	len = base->len + strlen(pathname);
	ce = make_empty_cache_entry(the_repository->index, len);
	oidcpy(&ce->oid, oid);
	memcpy(ce->name, base->buf, base->len);
	memcpy(ce->name + base->len, pathname, len - base->len);
	ce->ce_flags = create_ce_flags(0) | CE_UPDATE;
	ce->ce_namelen = len;
	ce->ce_mode = create_ce_mode(mode);

	/*
	 * If the entry is the same as the current index, we can leave the old
	 * entry in place. Whether it is UPTODATE or not, checkout_entry will
	 * do the right thing.
	 */
	pos = index_name_pos_sparse(the_repository->index, ce->name, ce->ce_namelen);
	if (pos >= 0) {
		struct cache_entry *old = the_repository->index->cache[pos];
		if (ce->ce_mode == old->ce_mode &&
		    !ce_intent_to_add(old) &&
		    oideq(&ce->oid, &old->oid)) {
			old->ce_flags |= CE_UPDATE;
			discard_cache_entry(ce);
			return 0;
		}
	}

	add_index_entry(the_repository->index, ce,
			ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
	return 0;
}

static int read_tree_some(struct tree *tree, const struct pathspec *pathspec,
			  int overlay_mode)