[Bug 1966203] Re: Syslog shows "systemd-udevd[2837]: nvme0n1: Process ... failed with exit code 1." in Ubuntu 22.04

[Alberto Mardegan]

Some updates, while I'm still investigating this on a QEMU running
Ubuntu Core 22.

The "snap auto-import" command is only needed on Ubuntu Core systems, so
the plan is to remove the /lib/udev/rules.d/66-snapd-autoimport.rules
from the snapd deb package (and consequently also from the snapd snap).

We do still need it in UC, but as a matter of fact the script is already
provided by the Ubuntu Core repositories:

- UC22: https://github.com/snapcore/core-base/blob/main/static/usr/lib/udev/rules.d/66-snapd-autoimport.rules
- UC20: https://github.com/snapcore/core20/blob/master/static/usr/lib/udev/rules.d/66-snapd-autoimport.rules
- UC18: https://github.com/snapcore/core18/blob/master/static/lib/udev/rules.d/66-snapd-autoimport.rules
- UC16: **missing**

The file in UC22 seems already correct, in that it does not call
unshare. So the only one left out is UC16, where we will add the udev
rule that we currently have in snapd; after that, we will remove the
rule from snapd and this bug for the desktop will be gone for good.

There is a remaining problem, however: the systemd-udevd.service in
Ubuntu 22 disallows the mount operation, so we'll have to update the
unit file to allow it. I think we'll also need to update the auto-import
command itself, because it appears that all errors while accessing the
devices are silenced, so we would have never known of this problem, if
it wasn't for this bug report.

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Title:
  Syslog shows "systemd-udevd[2837]: nvme0n1: Process ... failed with
  exit code 1." in Ubuntu 22.04

Status in snapd:
  Confirmed
Status in systemd package in Ubuntu:
  Invalid

Bug description:
  Configuration:
   OS:jammy-live-server20220320-amd64.iso
   CPU:AMD EPYC 7702 64-Core Processor
   UEFI Version:D8E119A
   BMC Version:D8BT19I
   SSD:Intel 1.60TB NVMe SSD
   Boot mode:legacy
  Reproduce Steps:
   1.Boot into BIOS and set boot mode to legacy
   2.install ubuntu 22.04 on NVMe SSD
   3.Check syslog log
  Current behaviors:
  syslog shows systemd-udevd errors in Ubuntu 22.04
  Feb  9 10:16:19 len systemd-udevd[2837]: nvme0n1: Process '/usr/bin/unshare -m /usr/bin/snap auto-import --mount=/dev/nvme0n1' failed with exit code 1.
  Feb  9 10:16:19 len systemd-udevd[2877]: nvme0n1p3: Process '/usr/bin/unshare -m /usr/bin/snap auto-import --mount=/dev/nvme0n1p3' failed with exit code 1.
  Feb  9 10:16:19 len systemd-udevd[2876]: nvme0n1p2: Process '/usr/bin/unshare -m /usr/bin/snap auto-import --mount=/dev/nvme0n1p2' failed with exit code 1.
  Feb  9 10:16:19 len systemd-udevd[2837]: nvme0n1p1: Process '/usr/bin/unshare -m /usr/bin/snap auto-import --mount=/dev/nvme0n1p1' failed with exit code 1.
  Feb  9 10:16:19 len systemd-udevd[2828]: sr0: Process '/usr/bin/unshare -m /usr/bin/snap auto-import --mount=/dev/sr0' failed with exit code 1.
  Feb  9 10:16:19 len systemd-udevd[2850]: dm-0: Process '/usr/bin/unshare -m /usr/bin/snap auto-import --mount=/dev/dm-0' failed with exit code 1.

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