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Colin Walters authored
A Red Hat QA engineer hit in practice a race condition in dbus-uuidgen where it could leave an empty file. dbus-uuidgen (_dbus_create_uuid_file_exclusively) formerly created an empty file in the path to the uuid, then filled it in. At some point, the internal libdbus _dbus_string_save_to_file became atomic on Unix at least (doing the save to temp file, fsync(), rename() dance). So _dbus_create_uuid_file_exclusively doesn't need to create the file beforehand anymore. However, it *does* need the file to be world-readable, unlike all other consumers of _dbus_string_save_to_file. So add a "world_readable" argument.
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