[Bug 1874501] Re: /dev/mapper/mpath* are not symlinks from udev consistently

[Michael Hudson-Doyle]

Actually it seems this was caused by subiquity running vgscan --mknodes
during block probing:

root at ubuntu-server:/# rm -rf /dev/mapper/mpath*
root at ubuntu-server:/# ls -l /dev/mapper/
total 0
crw------- 1 root root 10, 236 Apr 24 05:57 control
root at ubuntu-server:/# vgscan --mknodes
root at ubuntu-server:/# ls -l /dev/mapper/
total 0
crw------- 1 root root  10, 236 Apr 24 05:57 control
brw-rw---- 1 root disk 253,   0 Apr 27 21:16 mpatha
brw-rw---- 1 root disk 253,   1 Apr 27 21:16 mpatha-part1

retargeting bug...

** Package changed: multipath-tools (Ubuntu) => lvm2 (Ubuntu)

** Summary changed:

- /dev/mapper/mpath* are not symlinks from udev consistently
+ vgscan --mknodes creates block device multipath nodes in /dev/mapper

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https://bugs.launchpad.net/bugs/1874501

Title:
  vgscan --mknodes creates block device multipath nodes in /dev/mapper

Status in lvm2 package in Ubuntu:
  New

Bug description:
  Description:    Ubuntu 20.04 LTS
  Release:        20.04

  # apt-cache policy multipath-tools
  multipath-tools:
    Installed: 0.8.3-1ubuntu2
    Candidate: 0.8.3-1ubuntu2
    Version table:
   *** 0.8.3-1ubuntu2 500
          500 http://ports.ubuntu.com/ubuntu-ports focal/main s390x Packages
          100 /var/lib/dpkg/status

  
  /dev/mapper/mpatha is symlink which points to ../../dm-X device

  /dev/mapper/mpath is block device

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: multipath-tools 0.8.3-1ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic s390x
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: s390x
  CasperMD5CheckResult: pass
  CasperVersion: 1.445
  Date: Thu Apr 23 17:32:12 2020
  LiveMediaBuild: Ubuntu-Server 20.04 LTS "Focal Fossa" - Release s390x (20200423.1)
  ProcEnviron:
   TERM=screen.xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: multipath-tools
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.multipath.conf:
   defaults {
       user_friendly_names yes
       skip_kpartx no
       verbosity 4
   }
  mtime.conffile..etc.multipath.conf: 2020-04-23T15:47:28.659850

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