Public bug reported:

As reported on 
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1820291/comments/20
We fixed an issue and we added workrounds since basic mv_conffile coudn't 
handle it and did all sort of upgrade tests.

That all worked fine and moved the conffile.

It was now reported that due to some pre-checks that unattended upgrades
might do this might do some checks on its own.

Next step:
- check unattended upgrades through this change
- check if it only affects cases were the former config was modified (minority) 
or the default file layout (majority)


--- original report copied ---

just wanted to add: This bug also crashes unattended-upgrade and thus
prevents security updates on 18.04:

root@mailin1:~# unattended-upgrade
Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 1998, in <module>
    sys.exit(main(options))
  File "/usr/bin/unattended-upgrade", line 1714, in main
    if conffile_prompt(item.destfile):
  File "/usr/bin/unattended-upgrade", line 929, in conffile_prompt
    with open(prefix + conf_file, 'rb') as fp:
IsADirectoryError: [Errno 21] Is a directory: '/etc/qemu/fsfreeze-hook'

Basically, unattended-upgrade wants to compare old/new conffiles and
doesn't like it when the old conffile turns out to be a directory...

This prevents security updates to be installed. The unattended-upgrade
logs do not contain the trace, only the messages:

2019-04-05 13:24:24,851 INFO Initial blacklisted packages:
2019-04-05 13:24:24,853 INFO Initial whitelisted packages:
2019-04-05 13:24:24,853 INFO Starting unattended upgrades script
2019-04-05 13:24:24,854 INFO Allowed origins are: o=Ubuntu,a=bionic, 
o=Ubuntu,a=bionic-security, o=UbuntuESM,a=bionic'

And that's it.

You can't really get out of this without manually running 'apt-get
install qemu-guest-agent' because at this point, unattended-upgrade
can't update itself anymore.

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: unattended-upgrades (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: unattended-upgrades (Ubuntu)
   Importance: Undecided
       Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unattended-upgrades in
Ubuntu.
https://bugs.launchpad.net/bugs/1823872

Title:
  Fixing fsfreeze-hook can break unattended upgrades

Status in qemu package in Ubuntu:
  New
Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  As reported on 
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1820291/comments/20
  We fixed an issue and we added workrounds since basic mv_conffile coudn't 
handle it and did all sort of upgrade tests.

  That all worked fine and moved the conffile.

  It was now reported that due to some pre-checks that unattended
  upgrades might do this might do some checks on its own.

  Next step:
  - check unattended upgrades through this change
  - check if it only affects cases were the former config was modified 
(minority) or the default file layout (majority)

  
  --- original report copied ---

  just wanted to add: This bug also crashes unattended-upgrade and thus
  prevents security updates on 18.04:

  root@mailin1:~# unattended-upgrade
  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 1998, in <module>
      sys.exit(main(options))
    File "/usr/bin/unattended-upgrade", line 1714, in main
      if conffile_prompt(item.destfile):
    File "/usr/bin/unattended-upgrade", line 929, in conffile_prompt
      with open(prefix + conf_file, 'rb') as fp:
  IsADirectoryError: [Errno 21] Is a directory: '/etc/qemu/fsfreeze-hook'

  Basically, unattended-upgrade wants to compare old/new conffiles and
  doesn't like it when the old conffile turns out to be a directory...

  This prevents security updates to be installed. The unattended-upgrade
  logs do not contain the trace, only the messages:

  2019-04-05 13:24:24,851 INFO Initial blacklisted packages:
  2019-04-05 13:24:24,853 INFO Initial whitelisted packages:
  2019-04-05 13:24:24,853 INFO Starting unattended upgrades script
  2019-04-05 13:24:24,854 INFO Allowed origins are: o=Ubuntu,a=bionic, 
o=Ubuntu,a=bionic-security, o=UbuntuESM,a=bionic'

  And that's it.

  You can't really get out of this without manually running 'apt-get
  install qemu-guest-agent' because at this point, unattended-upgrade
  can't update itself anymore.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1823872/+subscriptions

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