Hi,

I'm running piuparts in a schroot as part of my packaging workflow. However,
when I plug in hardware on my host machine, or enable/disable things like
bluetooth/LTE modem/etc, during a piuparts run it will inadvertently fail:

[...]
2m51.1s ERROR: FAIL: After purging files have disappeared:
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/bEndpointAddress	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/bInterval	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/bLength	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/bmAttributes	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/direction	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/interval	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/async	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/autosuspend_delay_ms	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/control	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/runtime_active_kids	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/runtime_active_time	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/runtime_enabled	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/runtime_status	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/runtime_suspended_time	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/power/runtime_usage	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/type	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/uevent	 not owned
  /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.3/1-5.3.3/1-5.3.3.4/1-5.3.3.4.4/1-5.3.3.4.4.1/1-5.3.3.4.4.1:1.1/ep_81/wMaxPacketSize	 not owned

2m51.1s ERROR: FAIL: Installation, upgrade and purging tests.
2m51.5s DEBUG: Terminate schroot session '/var/run/schroot/mount/bookworm-amd64-sbuild-2ab9e614-03c3-11ef-9ce1-52540055ba9d-piuparts'
2m51.5s DEBUG: Starting command: ['schroot', '--end-session', '--chroot', 'session:bookworm-amd64-sbuild-2ab9e614-03c3-11ef-9ce1-52540055ba9d-piuparts']
2m51.6s DEBUG: Command ok: ['schroot', '--end-session', '--chroot', 'session:bookworm-amd64-sbuild-2ab9e614-03c3-11ef-9ce1-52540055ba9d-piuparts']
2m51.6s ERROR: piuparts run ends.

E: Piuparts run failed.

Since it's not immediately clear if it failed for those reasons alone, it makes
piuparts less useful. It would be nice if piuparts could ignore /sys, /dev,
/proc as they're not on-disk file systems anyway.

Greets,
Lee