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Bug 1547557

Summary: updating vdo package removes symlink to vdo.service
Product: Red Hat Enterprise Linux 7 Reporter: Jakub Krysl <jkrysl>
Component: vdoAssignee: Joseph Chapman <jochapma>
Status: CLOSED DUPLICATE QA Contact: Jakub Krysl <jkrysl>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.5CC: awalsh, bgurney, jkrysl, jochapma, rhandlin
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Clone Of: Environment:
Last Closed: 2018-02-23 15:09:06 UTC Type: Bug
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
output from 'yum install vdo kmod-kvdo' none

Description Jakub Krysl 2018-02-21 14:27:43 UTC 
Description of problem:
When installing newer version of vdo using yum with vdo already installed, the update removes symlink /etc/systemd/system/multi-user.target.wants/vdo.service but does not renew it.

Resolving Dependencies
--> Running transaction check
---> Package vdo.x86_64 0:6.1.0.146-16 will be updated
---> Package vdo.x86_64 0:6.1.0.149-16 will be an update
--> Finished Dependency Resolution

Dependencies Resolved
-- snip --
Running transaction
  Updating   : vdo-6.1.0.149-16.x86_64                                                               1/2
Removed symlink /etc/systemd/system/multi-user.target.wants/vdo.service.
  Cleanup    : vdo-6.1.0.146-16.x86_64                                                               2/2
  Verifying  : vdo-6.1.0.149-16.x86_64                                                               1/2
  Verifying  : vdo-6.1.0.146-16.x86_64                                                               2/2

Updated:
  vdo.x86_64 0:6.1.0.149-16

Complete!

Version-Release number of selected component (if applicable):
Tested with vdo 6.1.0.130 -> 6.1.0.146 and 6.1.0.146 -> 6.1.0.149

How reproducible:
100%

Steps to Reproduce:
1. yum install vdo
2. yum install $newer-version-of-vdo
3. ls /etc/systemd/system/multi-user.target.wants | grep vdo

Actual results:
[empty]

Expected results:
vdo.service

Additional info:
Comment 2 Andy Walsh 2018-02-21 23:28:29 UTC 
Created attachment 1399041 [details]
output from 'yum install vdo kmod-kvdo'

This symlink is created as part of the install steps of the RPM.

Attached is the output of a 'yum install vdo kmod-kvdo', where you can see the line 'Created symlink from /etc/systemd/system/multi-user.target.wants/vdo.service to /usr/lib/systemd/system/vdo.service.'

This is most likely coming from the %post section in the RPM:
  %post
  systemctl enable vdo.service ||:

What's unclear is why (since we don't distinguish between install, upgrade, or remove) the %post isn't run on the new RPM.

The %preun section is what is most likely causing the symlink to go away:
  %preun
  systemctl disable vdo.service ||:
Comment 4 Andy Walsh 2018-02-23 15:09:06 UTC 
This bug will is fixed as part of the solution for bz 1531111 by adopting the appropriate systemd macros.

*** This bug has been marked as a duplicate of bug 1531111 ***