udisks-monitor 0.2.0

Event-driven pub/sub wrapper around udisksctl monitor (Linux)

udisks-monitor

Event-driven pub/sub wrapper around udisksctl monitor (Linux).

One lightweight dependency (strip-ansi). Parses the human-readable output of udisksctl monitor into typed event dataclasses with wall-clock timestamps, dispatching to subscribers via an in-process event bus.

Install

pip install udisks-monitor

Quickstart

from udisks_monitor import UdisksMonitor, DevicePropertyChanged, JobProperties

mon = UdisksMonitor()

# Subscribe by event type and filter
@mon.on(DevicePropertyChanged, device='loop0', property_='BackingFile')
def on_backing(evt):
    if not evt.value:
        print(f"{evt.device_name} detached")

@mon.on(JobProperties, operation='filesystem-mount')
def on_mount(evt):
    print(f"mount job for {evt.objects}")

mon.start()
mon.join()

Events

Event	When
DevicePropertyChanged	A property on any device interface changed
InterfaceAdded	A D-Bus interface appeared on a device
InterfaceRemoved	A D-Bus interface was removed
JobAdded	A UDisks2 job was created
JobProperties	The operation and target objects of a job
JobCompleted	A job finished (success/failure)
JobRemoved	A job object was torn down

All events carry a timestamp: str field with the HH:MM:SS.mmm wall-clock time from udisksctl monitor.

Subscription filters

bus = EventBus()

# By event type
bus.subscribe(fn, event_type=DevicePropertyChanged)

# By operation string (matches JobProperties with that operation)
bus.subscribe(fn, event_type='filesystem-mount')

# By device name
bus.subscribe(fn, device='loop0')

# By D-Bus interface
bus.subscribe(fn, interface='org.freedesktop.UDisks2.Loop')

# By property name
bus.subscribe(fn, property_='BackingFile')

# Combined
bus.subscribe(fn,
    event_type=DevicePropertyChanged,
    device='loop0',
    property_='MountPoints')

# Decorator style
@bus.on(DevicePropertyChanged, device='loop0', property_='BackingFile')
def handler(evt): ...

Nix

{
  inputs.udisks-monitor.url = "github:MBanucu/udisks-monitor";
}

License

GPL-3.0-only