ERROR:blivet:failed to find parent for subvol about blivet HOT 3 CLOSED

@vojtechtrefny would it be possible to write up a few blivet steps that would simulate what anaconda is doing? So far I was not able to figure this out myself from looking at the blivet and anaconda code. Some simple thing I tried:

import blivet
dt = blivet.devicetree.DeviceTree()
dt.populate()
sda2 = dt.get_device_by_name("sda2")
BTRFS = blivet.formats.get_format('btrfs', exists=True)
btrfsroot = blivet.devices.btrfs.BTRFSDevice(parents=sda2, exists=True, fmt=BTRFS, uuid='17988bd4-4ad9-49c9-9cc7-73110966d8ab')
vol = blivet.devices.btrfs.BTRFSVolumeDevice(parents=btrfsroot, exists=True, fmt=BTRFS, uuid='17988bd4-4ad9-49c9-9cc7-73110966d8ab')

But this doesn't exactly do things that anaconda is doing. Anaconda is looking at all subvolumes. How does it do that? Because I think that there is where it goes wrong. Anaconda is creating BTRFSSubVolumeDevice instances in the wrong order. It hits a child subvol before it has seen the parent.

from blivet.

import blivet
blivet.flags.flags.auto_dev_updates = True
b = blivet.Blivet()
b.reset()

Setting the auto_dev_updates to True is the key here -- by default blivet doesn't mount btrfs volumes to get the list of subvolumes (we don't want to mount random devices when running outside the installer environment). So with the flag set you should see all the subvolumes in the devicetree (or in your case, reset will probably crash), you can then use print(b.devicetree) for a simple device tree visualization.

from blivet.

Thanks for the tip. Unfortunately (if you can call it that) the problem has gone away. I'll close this issue for now and reopen it when it happens again.

from blivet.