[Bug 1875045] Re: Ubiquity 20.04 exports existing ZFS pools

[Saverio Miroddi]

> Regarding your other issue, it is possible that using /dev/sdX for vdev
> causes it. Depending on the type of block device these names are not
> stable and may change on boot or when udev runs. It's more reliable to
> use /dev/disk/by-uuid or /dev/disk/by-partuuid which are persistent.

I think this is valid for pools (which in fact, I configure with this
strategly, specifically by using `/dev/by-id` entries), but not for
zvols (which is where I experienced the problem).

Zvols use `/dev/zd*` symlink destinations, and those were the entries
that I found swapped.

I don't think there is a any relation between `/dev/disk/by-(id|uuid)`
and zvols, since zvols live inside pools.

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https://bugs.launchpad.net/bugs/1875045

Title:
  Ubiquity 20.04 exports existing ZFS pools

Status in ubiquity package in Ubuntu:
  Fix Committed

Bug description:
  For unclear reasons (18.04 didn't have this issue), Ubiquity on 20.04
  exports existing ZFS pools, (very) shortly after execution.

  To repeat (assumes a `/dev/sda` disk):

  - start a 20.04 Ubuntu Desktop live media
  - open a terminal
  - create a zfs pool: `zpool create test /dev/sda`
  - verify that it's been created: `zpool list`
  - launch ubiquity: `ubiquity`
  - open a separate terminal
  - list the ZFS pools: `zpool list`

  no pools are now listed.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubiquity 20.04.15
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckMismatches: ./casper/vmlinuz
  CasperMD5CheckResult: skip
  CasperVersion: 1.445
  CurrentDesktop: MATE
  Date: Sat Apr 25 15:21:25 2020
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed quiet splash ---
  LiveMediaBuild: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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