[Bug 1657646] [NEW] Missing thin-provisioning-tools prevent VG from being (de)activated

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Creating a thin pool LV is allowed even when thin-provisioning-tools is
not installed. But deactivating, or activating, the VG fails.

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 isn't
installed.

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

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

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

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

root at 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 at 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 at 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 at 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 at 15-89:~# lvs -a
  LV              VG   Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync 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 at 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 at 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 at 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

** Affects: lvm2 (Ubuntu)
     Importance: High
         Status: Triaged


** Tags: architecture-ppc64le bugnameltc-150003 severity-high targetmilestone-inin16042
-- 
Missing thin-provisioning-tools prevent VG from being (de)activated
https://bugs.launchpad.net/bugs/1657646
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