Function checkMembershipInCurrentExtension

src/backend/catalog/pg_depend.c:252–281

* If we are executing a CREATE EXTENSION operation, check that the given * object is a member of the extension, and throw an error if it isn't. * Otherwise, do nothing. * * This must be called whenever a CREATE IF NOT EXISTS operation (for an * object type that can be an extension member) has found that an object of * the desired name already exists. It is insecure for an extension to use

 * properties.
 */
void
checkMembershipInCurrentExtension(const ObjectAddress *object)
{
	/*
	 * This is actually the same condition tested in
	 * recordDependencyOnCurrentExtension; but we want to issue a
	 * differently-worded error, and anyway it would be pretty confusing to
	 * call recordDependencyOnCurrentExtension in these circumstances.
	 */

	/* Only whole objects can be extension members */
	Assert(object->objectSubId == 0);

	if (creating_extension)
	{
		Oid			oldext;

		oldext = getExtensionOfObject(object->classId, object->objectId);
		/* If already a member of this extension, OK */
		if (oldext == CurrentExtensionObject)
			return;
		/* Else complain */
		ereport(ERROR,
				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
				 errmsg("%s is not a member of extension \"%s\"",
						getObjectDescription(object, false),
						get_extension_name(CurrentExtensionObject)),
				 errdetail("An extension may only use CREATE ... IF NOT EXISTS to skip object creation if the conflicting object is one that it already owns.")));
	}
}

/*
 * deleteDependencyRecordsFor -- delete all records with given depender