** Changed in: lvm2 (Ubuntu)
     Assignee: Canonical Foundations Team (canonical-foundations) => 
(unassigned)

** Changed in: ubuntu-power-systems
     Assignee: Canonical Foundations Team (canonical-foundations) => Canonical 
Server Team (canonical-server)

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https://bugs.launchpad.net/bugs/1657646

Title:
  [20.04] Missing thin-provisioning-tools prevents VG with thin pool LV
  from being (de)activated, but not its creation

Status in The Ubuntu-power-systems project:
  Triaged
Status in lvm2 package in Ubuntu:
  Confirmed
Status in lvm2 package in Debian:
  New

Bug description:
  Creating a thin pool LV is allowed even when thin-provisioning-tools
  is not installed. But deactivating or activating that VG fails. Since
  deactivating the VG usually only happens at reboot, the user might
  fail to notice this big problem until then.

  I think the lvconvert tool, used to combine the two "thin LVs" into a
  thin pool LV, should refuse to run if thin-provisioning-tools, or the
  needed scripts, aren't installed.

  Steps to reproduce:
  root@15-89:~# vgcreate vg /dev/vdb1
    Volume group "vg" successfully created

  root@15-89:~# vgs
    VG   #PV #LV #SN Attr   VSize  VFree
    vg     1   0   0 wz--n- 40.00g 40.00g

  root@15-89:~# lvcreate -n pool0 -l 90%VG vg
    Logical volume "pool0" created.

  root@15-89:~# lvcreate -n pool0meta -l 5%VG vg
    Logical volume "pool0meta" created.

  root@15-89:~# lvs
    LV        VG   Attr       LSize  Pool Origin Data%  Meta%  Move Log 
Cpy%Sync Convert
    pool0     vg   -wi-a----- 36.00g
    pool0meta vg   -wi-a-----  2.00g

  root@15-89:~# ll /dev/mapper/
  total 0
  drwxr-xr-x  2 root root     100 Jun 21 14:15 ./
  drwxr-xr-x 20 root root    3820 Jun 21 14:15 ../
  crw-------  1 root root 10, 236 Jun 21 13:15 control
  lrwxrwxrwx  1 root root       7 Jun 21 14:14 vg-pool0 -> ../dm-0
  lrwxrwxrwx  1 root root       7 Jun 21 14:15 vg-pool0meta -> ../dm-1

  root@15-89:~# lvconvert --type thin-pool --poolmetadata vg/pool0meta vg/pool0
    WARNING: Converting logical volume vg/pool0 and vg/pool0meta to pool's data 
and metadata volumes.
    THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
  Do you really want to convert vg/pool0 and vg/pool0meta? [y/n]: y
    Converted vg/pool0 to thin pool.

  root@15-89:~# ll /dev/mapper/
  total 0
  drwxr-xr-x  2 root root     120 Jun 21 14:15 ./
  drwxr-xr-x 20 root root    3840 Jun 21 14:15 ../
  crw-------  1 root root 10, 236 Jun 21 13:15 control
  lrwxrwxrwx  1 root root       7 Jun 21 14:15 vg-pool0 -> ../dm-2
  lrwxrwxrwx  1 root root       7 Jun 21 14:15 vg-pool0_tdata -> ../dm-1
  lrwxrwxrwx  1 root root       7 Jun 21 14:15 vg-pool0_tmeta -> ../dm-0
  root@15-89:~# lvs -a
    LV              VG   Attr       LSize  Pool Origin Data%  Meta%  Move Log 
Cpy%S
  ync Convert
    [lvol0_pmspare] vg   ewi-------  2.00g
    pool0           vg   twi-a-tz-- 36.00g             0.00   0.01
    [pool0_tdata]   vg   Twi-ao---- 36.00g
    [pool0_tmeta]   vg   ewi-ao----  2.00g

  If you now reboot the system, all that is gone:
  root@15-89:~# ll /dev/mapper/
  total 0
  drwxr-xr-x  2 root root      60 Jun 21 14:28 ./
  drwxr-xr-x 19 root root    3760 Jun 21 14:28 ../
  crw-------  1 root root 10, 236 Jun 21 14:28 control

  The same happens if you deactivate the VG (which the reboot
  undoubtedly triggers). It fails because of a missing
  /usr/sbin/thin_check which is provided by the thin-provisioning-tools
  package:

  root@15-89:~# vgchange -a n
    /usr/sbin/thin_check: execvp failed: No such file or directory
    WARNING: Integrity check of metadata for pool vg/pool0 failed.
    0 logical volume(s) in volume group "vg" now active

  root@15-89:~# ll /dev/mapper/
  total 0
  drwxr-xr-x  2 root root      60 Jun 21 14:29 ./
  drwxr-xr-x 19 root root    3760 Jun 21 14:29 ../
  crw-------  1 root root 10, 236 Jun 21 14:28 control

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