I was able to reproduce it in a freshly installed VM (VMware).
----------------------
root@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@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@ubuntu:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
root@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@ubuntu:~# file /var/run/reboot-required
/var/run/reboot-required: cannot open `/var/run/reboot-required' (No such file
or directory)
root@ubuntu:~# touch /var/run/reboot-required
root@ubuntu:~# unattended-upgrades --dry-run
(ssh disconnects, system reboots)
root@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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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/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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1269177/+subscriptions
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