[Bug 1862846] Re: Crash and failure installing focal

[Ryan Harper]

@Lee  Thanks for tracking down the util-linux bug.

Since this is broken in 2.34 (eoan/focal); I'm thinking we should use
sysfs to find the parent via device name walking;

Given a kname (nvme0n1p1) of the target partition

# look up sysfs path from kname
% realpath /sys/class/block/nvme0n1p1
/sys/devices/pci0000:00/0000:00:02.0/0000:05:00.0/nvme/nvme0/nvme0n1/nvme0n1p1

# check if it's a partition
% ls -al /sys/devices/pci0000:00/0000:00:02.0/0000:05:00.0/nvme/nvme0/nvme0n1/nvme0n1p1/partition
-r--r--r-- 1 root root 4096 Feb 12 08:08 
/sys/devices/pci0000:00/0000:00:02.0/0000:05:00.0/nvme/nvme0/nvme0n1/nvme0n1p1/partition

# extract parent device path
% dirname /sys/devices/pci0000:00/0000:00:02.0/0000:05:00.0/nvme/nvme0/nvme0n1/nvme0n1p1
/sys/devices/pci0000:00/0000:00:02.0/0000:05:00.0/nvme/nvme0/nvme0n1

# extract parent device major/minor
% cat /sys/devices/pci0000:00/0000:00:02.0/0000:05:00.0/nvme/nvme0/nvme0n1/dev
259:0

# udev symlinks/dev/block/$MAJOR:$MINOR
% ls -al /dev/block/259:0 
lrwxrwxrwx 1 root root 10 Jan 18 00:16 /dev/block/259:0 -> ../nvme0n1
% realpath /dev/block/259:0
/dev/nvme0n1

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https://bugs.launchpad.net/bugs/1862846

Title:
  Crash and failure installing focal

Status in subiquity:
  New
Status in curtin package in Ubuntu:
  Triaged
Status in util-linux package in Ubuntu:
  New
Status in curtin source package in Eoan:
  Invalid
Status in util-linux source package in Eoan:
  New
Status in curtin source package in Focal:
  Triaged
Status in util-linux source package in Focal:
  New

Bug description:
  During an install of the daily live image for 20.04 Ubuntu Server, the
  installer first crashed and restarted itself, then failed to install
  the system.

  Attached are the logs left on the install USB key.

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