Virtualized USB failing pyudev check

[brycepg]

Hello,

I'm using Qubes, a Xen distribution which runs Linux paravirtual VMs. I've passed through a my usb device with multibootusb installed however multibootusb would not even detect it unless I changed some code.

The device is this initalized as a '/dev/xvdi', which means it's a "xen virtual disk" letter i. Unfortunately, this device never gets found because it fails the check at scripts/usb.py:109. Specifically the device.get('ID_BUS') returns None instead of "usb" or "scsi". I got the device to work by changing the line to:

if device.get('DEVTYPE') == "partition" and 'xvdi' in device.sys_path:

Obiously this is a hack. But multibootusb now detects the drive, and I can boot the drive in QEMU. If I do not add the 'xvdi' in device.sys_path, then multibootusb chokes later down the line when getting device details.

Here's some other info for this device:

device.driver also returns None
device.sys_path returns "/sys/devices/cvd-51840/block/xvdi/xvdi1"
device.device_type returns "Parition"
device.subsystem returns "block"
stat.S_ISBLK(os.stat("/dev/xvdi1").st_mode) returns True

System:

sudo lspci -vvv returns nothing.

I'm not sure how to fix this. If you have any suggestions I'd be willing to try.

[alindt]

@brycepg, can you checkout the devel brach and test with both "All drives" checked and unchecked?

[brycepg]

@alindt

Unfortunately Multibootusb still says that no drives were found both with the All drives checkbox unchecked / checked. device.get("ID_BUS") returns None for my USB, and that's why the check is failing for the 'All drives' option at scripts/usb.py:104

[alindt]

@brycepg, please post the output of the following:

$ udevadm info -q all --root /dev/xvdi;  udevadm info -q all --root /dev/xvdi1

[brycepg]

=== pyudev version: 0.21.0 ===

=== /dev/xvdi ===

('DEVNAME', '/dev/xvdi')
('DEVPATH', '/devices/vbd-51840/block/xvdi')
('DEVTYPE', 'disk')
('ID_PART_TABLE_TYPE', 'dos')
('ID_PART_TABLE_UUID', '00091a83')
('MAJOR', '202')
('MINOR', '128')
('SUBSYSTEM', 'block')
('TAGS', ':systemd:')
('USEC_INITIALIZED', '31349554277')

=== /dev/xvdi1 ===

('DEVLINKS', '/dev/disk/by-uuid/50C7-CF89')
('DEVNAME', '/dev/xvdi1')
('DEVPATH', '/devices/vbd-51840/block/xvdi/xvdi1')
('DEVTYPE', 'partition')
('ID_FS_TYPE', 'vfat')
('ID_FS_USAGE', 'filesystem')
('ID_FS_UUID', '50C7-CF89')
('ID_FS_UUID_ENC', '50C7-CF89')
('ID_FS_VERSION', 'FAT32')
('ID_PART_ENTRY_DISK', '202:128')
('ID_PART_ENTRY_FLAGS', '0x80')
('ID_PART_ENTRY_NUMBER', '1')
('ID_PART_ENTRY_OFFSET', '2048')
('ID_PART_ENTRY_SCHEME', 'dos')
('ID_PART_ENTRY_SIZE', '122550272')
('ID_PART_ENTRY_TYPE', '0xb')
('ID_PART_ENTRY_UUID', '00091a83-01')
('ID_PART_TABLE_TYPE', 'dos')
('ID_PART_TABLE_UUID', '00091a83')
('MAJOR', '202')
('MINOR', '129')
('SUBSYSTEM', 'block')
('TAGS', ':systemd:')
('USEC_INITIALIZED', '31349607585')

[alindt]

@brycepg, please check the devel branch after this pull request gets merged

[brycepg]

Thanks @alindt, the fix works great.

[alindt]

fixed in a150156