LGUG2Z/komorebi · error · ErrorKind::NotFound

PowerShell session not started

Error message

PowerShell session not started

What it means

Sentinel error from komorebi-bar's exec_powershell: the persistent PowerShell session (whose stdin is stored in SESSION_STDIN) was never started, so commands cannot be written to it. Fires when the bar's PowerShell child process failed to spawn or was not initialized before execute() attempted to send it a command.

Source

Thrown at komorebi-bar/src/bar.rs:145

    Ok(())
}

pub fn exec_powershell(cmd: &str) -> eyre::Result<()> {
    if let Some(session_stdin) = SESSION_STDIN.lock().as_mut() {
        if let Err(e) = writeln!(session_stdin, "{cmd}") {
            tracing::error!(error = %e, cmd = cmd, "failed to write command to PowerShell stdin");
            return Err(e.into());
        }

        if let Err(e) = session_stdin.flush() {
            tracing::error!(error = %e, "failed to flush PowerShell stdin");
            return Err(e.into());
        }

        return Ok(());
    }

    Err(Error::new(ErrorKind::NotFound, "PowerShell session not started").into())
}

pub struct Komobar {
    pub hwnd: Option<isize>,
    pub monitor_index: Option<usize>,
    pub disabled: bool,
    pub config: KomobarConfig,
    pub render_config: Rc<RefCell<RenderConfig>>,
    pub monitor_info: Option<Rc<RefCell<MonitorInfo>>>,
    pub left_widgets: Vec<Box<dyn BarWidget>>,
    pub center_widgets: Vec<Box<dyn BarWidget>>,
    pub right_widgets: Vec<Box<dyn BarWidget>>,
    pub rx_gui: Receiver<KomorebiEvent>,
    pub rx_config: Receiver<KomobarConfig>,
    pub bg_color: Rc<RefCell<Color32>>,
    pub bg_color_with_alpha: Rc<RefCell<Color32>>,
    pub scale_factor: f32,
    pub size_rect: komorebi_client::Rect,

View on GitHub (pinned to e0709f02bf)

Solutions

1. Check komorebi-bar startup logs for why the PowerShell session failed to spawn (e.g. powershell.exe not on PATH)
2. Restart komorebi-bar so the session is initialized before commands are issued
3. Ensure the PowerShell executable is available and not blocked by security policy

When it happens

Trigger: Thrown at komorebi-bar/src/bar.rs:145 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of LGUG2Z/komorebi@e0709f02bf (2026-09-06). Data as JSON: /api/errors/6e9040b1e81df4b8. Report an issue: GitHub.