Function join_with_invite 

pub async fn join_with_invite(
    builder: CovenBuilder,
    code: &str,
    joiner: Joiner,
    device_name: &str,
    on_status: impl Fn(BootstrapStatus),
    control: &JoinControl,
) -> Result<Option<CovenHandle>, BootstrapError>

Accept provider access, retain one signed request across restarts, and wait for approval. Returns the open store, or None when declined or expired. joiner is the new person with the name they typed, or a recovery, as the invite’s InviteInfo::kind says; the other kind fails with CodeError::WrongJoiner before anything changes. Dropping the future before the join finds its admission preserves the unfinished join for a subsequent call with the same invite, device name and person, or resume_join. On Dropbox and OneDrive the builder’s sign-in is kept on the device beside the saved code until the join ends, and a later call without one uses it (§13.2). control cancels the join or asks for a check for approval at once. Cancelling before the request may have been sent removes the unpublished installation; after, the call ends with BootstrapError::JoinRequestSent and keeps it, as dropping does. Once the join finds its admission it publishes the store, a cancel notwithstanding, then loads it, reporting Loading; a failure while it loads returns BootstrapError::Published with the open handle (§13.2). A store whose unfinished installation holds a restore’s record is refused with StoreLockError::BootstrapPending before anything changes (§13.4).