xai-org/grok-build · error · io::Error

Writeback storage mode requires authentication. Run 'grok lo

Error message

Writeback storage mode requires authentication. Run 'grok login' first.

What it means

Configuring StorageMode::Writeback (local writes with remote sync-back) requires an AuthManager to obtain credentials for RemoteSync; when none was provided, setup fails fast with io::ErrorKind::PermissionDenied instead of silently running unauthenticated. The message points the user at 'grok login'.

Source

Thrown at crates/codegen/xai-grok-shell/src/session/persistence.rs:2415

        if let SessionUpdate::Acp(notification) = update {
            remote_sync.queue(*notification);
            backfilled += 1;
        }
    }
    remote_sync.flush();
    backfilled
}

fn init_remote_sync(
    summary: &Summary,
    storage_mode: StorageMode,
    auth_manager: Option<Arc<crate::auth::AuthManager>>,
) -> io::Result<Option<RemoteSync>> {
    match storage_mode {
        StorageMode::Local => Ok(None),
        StorageMode::Writeback => {
            let auth_manager = auth_manager.ok_or_else(|| {
                io::Error::new(
                    io::ErrorKind::PermissionDenied,
                    "Writeback storage mode requires authentication. Run 'grok login' first.",
                )
            })?;
            if let Some(auth) = auth_manager.current_or_expired() {
                if auth.is_zdr_team() {
                    tracing::debug!("ZDR team: skipping remote sync");
                    return Ok(None);
                }
            } else {
                tracing::warn!(
                    "writeback: no auth loaded yet, ZDR check skipped (backend enforces server-side)"
                );
            }
            tracing::info!("Writeback mode enabled, syncing to backend");
            let client =
                crate::remote::BackendClient::new().with_auth_manager(auth_manager.clone());
            let metadata = ExportedMetadata::from_summary(summary);

View on GitHub (pinned to bc7f02eddd)

Solutions

Run 'grok login' to create credentials, then retry
Pass an AuthManager instance when constructing the session if you build it programmatically
Switch storage_mode to Local if remote sync is not needed
Fix environment (HOME/XDG config paths, mounted credentials) so the auth manager can be created

Example fix

// before
let session = Session::builder().storage_mode(StorageMode::Writeback).build()?;
// after
let session = Session::builder()
    .storage_mode(StorageMode::Writeback)
    .auth_manager(Some(AuthManager::load()?))
    .build()?;
// or run: grok login

Defensive patterns

Strategy: validation

Validate before calling

if storage_mode == StorageMode::Writeback && auth_manager.is_none() {
    bail!("Writeback mode needs auth: run `grok login` or pass an AuthManager");
}

Type guard

fn writeback_auth_ready(mode: StorageMode, auth: &Option<Arc<AuthManager>>) -> bool {
    mode != StorageMode::Writeback || auth.is_some()
}

Try / catch

match Session::open(cfg).await {
    Err(e) if e.kind() == io::ErrorKind::PermissionDenied && e.to_string().contains("grok login") => {
        run_login_flow()?;
        Session::open(cfg).await?
    }
    other => other?,
}

Prevention

Run 'grok login' during setup before enabling Writeback
Validate storage mode vs available auth at config load time
In CI/containers, mount or provision credentials, or fall back to Local mode
Ensure HOME/XDG config dirs are writable so persisted credentials load

When it happens

Trigger: Starting a session with storage_mode = StorageMode::Writeback while the auth_manager parameter is None — i.e. no credentials source configured for remote sync.

Common situations: Fresh install where 'grok login' was never run; CI/container environment with no persisted auth; running with a config that forces Writeback while auth is disabled/omitted; HOME/config dir not writable so stored credentials are invisible.

Understand the failure class

Authentication and authorization failures — expired tokens, bad credentials, and missing scopes.

Related errors

AI-assisted analysis of xai-org/grok-build@bc7f02eddd (2026-08-31). Data as JSON: /api/errors/80d2e2d2df8d3108. Report an issue: GitHub.