[Bug 1269177] Re: Running 'unattended-upgrades --dry-run' reboots the machine

[Denis Nikolaenko]

I was able to reproduce it in a freshly installed VM (VMware).

----------------------
root at ubuntu:~# egrep -v '(^\s*//.*$|^\s*$)' /etc/apt/apt.conf.d/50unattended-upgrades 
Unattended-Upgrade::Allowed-Origins {
        "${distro_id}:${distro_codename}";
        "${distro_id}:${distro_codename}-security";
        "${distro_id}ESM:${distro_codename}";
};
Unattended-Upgrade::Package-Blacklist {
};
Unattended-Upgrade::Automatic-Reboot "true";

root at ubuntu:~# uname -a
Linux ubuntu 4.4.0-104-generic #127-Ubuntu SMP Mon Dec 11 12:16:42 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

root at ubuntu:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:        16.04
Codename:       xenial

root at ubuntu:~# apt-get update && apt-get dist-upgrade -y
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:2 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Get:3 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]        
Get:4 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]                
Fetched 306 kB in 2s (146 kB/s)                              
Reading package lists... Done
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

root at ubuntu:~# file /var/run/reboot-required
/var/run/reboot-required: cannot open `/var/run/reboot-required' (No such file or directory)

root at ubuntu:~# touch /var/run/reboot-required

root at ubuntu:~# unattended-upgrades --dry-run

(ssh disconnects, system reboots)

root at ubuntu:~# cat /var/log/unattended-upgrades/unattended-upgrades.log 
2017-12-16 09:59:17,772 INFO Initial blacklisted packages: 
2017-12-16 09:59:17,773 INFO Initial whitelisted packages: 
2017-12-16 09:59:17,773 INFO Starting unattended upgrades script
2017-12-16 09:59:17,773 INFO Allowed origins are: ['o=Ubuntu,a=xenial', 'o=Ubuntu,a=xenial-security', 'o=UbuntuESM,a=xenial']
2017-12-16 09:59:21,610 INFO No packages found that can be upgraded unattended and no pending auto-removals
2017-12-16 09:59:21,611 WARNING Found /var/run/reboot-required, rebooting

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https://bugs.launchpad.net/bugs/1269177

Title:
  Running 'unattended-upgrades --dry-run' reboots the machine

Status in unattended-upgrades package in Ubuntu:
  Fix Released

Bug description:
  Much to my surprise, when I did a dry-run test of unattended-upgrades
  my server was forcibly rebooted. I must have had the file '/var/run
  /reboot-required' present.

  But needless to say: a --dry-run should NOT perform a reboot of the
  server with zero warning. Seriously.

  Output from /var/log/unattended-upgrades.log

  2014-01-15 11:14:26,474 INFO Initial blacklisted packages: 
  2014-01-15 11:14:26,474 INFO Starting unattended upgrades script
  2014-01-15 11:14:26,475 INFO Allowed origins are: ['o=Ubuntu,a=precise-security']
  2014-01-15 11:14:35,846 INFO Option --dry-run given, *not* performing real actions
  2014-01-15 11:14:35,846 INFO Packages that are upgraded: bind9-host dnsutils libbind9-80 libdns81 libisc83 libisccc80 libisccfg82 liblwres80 libssl1.0.0 linux-generic-pae linux-headers-generic-pae linux-image-generic-pae linux-libc-dev openssl
  2014-01-15 11:14:35,847 INFO Writing dpkg log to '/var/log/unattended-upgrades/unattended-upgrades-dpkg_2014-01-15_11:14:35.846820.log'
  2014-01-15 11:15:10,610 INFO All upgrades installed
  2014-01-15 11:15:10,611 WARNING Found /var/run/reboot-required, rebooting

  Version: 0.76ubuntu1

  As an aside, it makes a lot of sense to me to put the reboot on a
  timer, even if it's only a one minute (i.e. shutdown -r 1). That would
  have at least given me a chance to prevent the reboot if I had seen
  the warning. If that's a configuration setting I don't see it
  anywhere.

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